All, Boat Bimini That is, until my last outing Under heavy acceleration, the engine bogged down and stumbled. Daytona Beach, FL. Products, Carbon Monoxide & So i couldn't hold the bottom fitting while i twisted the top to get the pick up out. Not having the secondary air valve linkage rod in place can cause a bog when the air valve snaps open under heavy throttle. Winches, Boat Motor Supports & 1,364. The throttle position sensor provides throttle position feedback to the ECM. Is that correct? Yours should be around 2 seconds. The Quadrajet's basic design didn't change much over its 25-year production life with the exception being the introduction of APT (Adjustable Part Throttle) in 1968 and electronic mixture control later. The rod connects to the choke unloader which serves as: 1. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Hardware, Boat JavaScript is disabled. All this is assuming your ignition system is up to snuff. Any vacuum leak anywhere will cause driveability issues. Hello i have a 1967 el camino 327 small block with a rochester quadrajet carb and a turbo 400 trans. Details: SBC 350 - Stock high mileage motor Quadrajet - APT screw turned out 1.5 turns from bottom w/ 67 jets. I did some looking on this site and others and i've done a lot of youtube watching on these carbs. Fuel metering rods pulse rapidly as a means to precisely control the air/fuel mixture. The secondary pull-off operates off of vacuum and keeps the secondary air valve closed until a low vacuum condition exists (WOT). Not having the secondary air valve linkage rod in place can cause a bog when the air valve snaps open under heavy throttle. The vacuum operated air valves above the secondaries, when properly adjusted, open at a slower clip to compensate for the large mechanical secondary throttle plates, which open quickly causing that legendary bog/lag Quadrajets are known for. It sounds like it's running out of gas. Kind of an enrichment/acceleration feed to get the fuel sucking through the secondary bores. Thanks you guys im going to be working on the elky in a while ill check it out. Savers, Boat Trailer Guides & WebJET Performance offers remanufactured Rochester Quadrajet carburetors and tuning kits. This thing runs great, starts every time and idles nice. JavaScript is disabled. I have a quadrajet on the 454 in my truck, electric choke etc. The 0.135 valve works well in most drag or circle track applications, while Edelbrock also offers a 0.145 high-flow assembly (EDE1980) for fuel-thirsty machines. Let's say about 300 horsepower to help give you can idea. If you dont want it give it to me. I wouldn't sweat that idle speed change. Might be from carb, choke or timing. Are you saying run without the separator? pump ck. Platforms, Slide 1. check to make sure you are getting a good accelerator pump squirt 2. Well, I checked to see if it bogged when cold this morning and sure enough it did under WOT in park, I'm stumped. This is the release rate. Be sure your float level and fuel pressure is correct.If you have allready rebuilt it ,that may be the trouble. You are using an out of date browser. Caulking, Marine Engine I don't know if its a problem but I have to tap the gas to get it to idle down after it starts. There is no mistaking that quadrajet sound when you get into it, so I don't think that its keeping them from opening. Deals, Boat Seats Timed to ~6 BTDC with vacuum advance disconnected.HEI distributor Elevation is 9,000ft. There isn't much you have to do to the Quadrajet to get it to perform in a box-stock application. Because the Quadrajet flows so well by design it isn't that hard to change fuel metering via larger jets and metering rods to get super tuning started. Deals, Electrical The accelerator pump may be replaced with a high-performance type (EDE1982) to give more pump shot, when desired. pump bores, napa USED to have an accelerator pump plunger that was oversize IIRC. For most street and weekend race applications you can to get by with 750-800 cfm without breaking a sweat. Unless I let off the throttle, the engine would die. Going to a rod with a smaller power tip, for example, will richen the mixture, while a larger power tip will lean the engine. This is a Rochester Quadrajet "4MV" carburetor from a Chevrolet 427ci, 390-horse big-block. If I step on it from part-throttle/low rpm's it bogs pretty hard and sometimes even dying. Take it apart and lightly sand-clean it. The Quadrajet has 1 3/32- or 1 7/32-inch primary throttle bores with either 750 or 800 cfm. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! WebEp: 25 in this video I show how to fix a hesitation and/or bogging issue with carburetors by adjusting secondaries. One of the few shortcomings of the Quadrajet is the fact that it uses a single fuel inlet and float bowl to feed the engine, unlike high-performance Holley models, and therefore, keeping the fuel bowl full at all times is critical. Sockets, Marine Electrical you floor it, it pops through the carb and falls over. Accessories, Boat Before we go any further, the "CCC" (Computer Command Control) electronic control Quadrajet, known as the "E4M", cannot be used on a non-CCC vehicle. An O2 sensor in the exhaust monitors exhaust oxygen content. it's all the way out in the pic. Boat, Sell A You'll want to find a newer, more refined core, which is typically from the 1970s and early 1980s. Look at it, it lifts the metering rods back there at the secondarys and hence fuel floes through the jets.That is how the secondary cicuit is metered. I'm glad you found the issue with the entry filter. The downside to older Quadrajet cores is abuse and core shift. If that little plastic cam lifts the metering rods when you push open the butterflies then the passages the jets are in could be plugged. Drink Holders, http://www.marinepartssource.com/new0Fuel%20Filter, http://discountmarinesource.com/p-52847-sierra-in-line-fuel-filter-7855.aspx. The car ran, but would bog on acceleration and backfire through the carb too. One mistake performance enthusiasts make is not getting the fuel curve to match the powerband. Ropes, Boat My Tom Mobley prepared Quadrajet in action. 2. WebHow to de-bog your Quadrajet part 1 Tyler's Forgotten Car Rescue 34.4K subscribers 169K views 12 years ago Sorry guys, I got the videos a bit out of order. Jan 19, 2011. The rod connects to the choke unloader which serves as: 1. It catches up and kicks butt afterward, but it has a pretty serious hesitation first. Ok I pushed the vaccum release all the way in and it takes 3 seconds for it to return. Hardware, Boat Seats by Tops, Bimini Top When selecting a carb, it should be first be inspected for damage or corrosion. Try it fast and slow and watch the stream of fuel. 1160 hours on engine. The mechanic gods were not in with me last night obviously. Considering the carb is a recent rebuild i wasn't really surprised. Biminis, View WebEp: 25 in this video I show how to fix a hesitation and/or bogging issue with carburetors by adjusting secondaries. That check valve being coroded up badly was the main culprit!1 The paper filter -likely was catching the crap from that corosion!! Acessories, Fish Cleaning Hardware, Boat Seat http://s1232.photobucket.com/albums/ff362/Nickvt/, http://s1232.photobucket.com/albums/ff362/Nickvt/1934 Plymouth/, http://www.youtube.com/watch?v=Yn420s-LDzY, http://s80.photobucket.com/albums/jvideos/?action=view¤t=2011_09110020.mp4. Test this pump for fuction at the sensor and pump. It has been proven you can modify the Quadrajet to flow in excess of 1,000 cfm. Wow, great pics. Thanks folks!!! For a better experience, please enable JavaScript in your browser before proceeding. Everything I can tell says that the carb is tuned right - here's the run down on whats happening: and i'll try and be as specific as possible so sorry if this is a bit long. Make sure the dist vacuum advance is connected to full manifold vacuum. Did you know Ford ran the Quadrajet on its 1970-'71 429ci big-blocks. The pull-off is connected by a linkage rod. The secondaries on the qjet have their own acceleration wells of reserve fuel that gets used when going from primaries to secondaries. Rollers, Boat Trailer Waxes, Boat Cleaning Dock, Cabin and VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Lead plugs must be carefully melted and removed, then, passages inspected and cleared. Privacy Policy. I rebuilt the 4-bbl Quadrajet in 2013 and haven't had any issues since. Subsequently, it is extremely unlikely that new units will ever be produced again. On the other hand, if the valve doesnt open quick enough to meet the engines air/fuel demands, the engine will not accelerate to its potential. ball could be your culprit. If the secondaries open too fast there is not enough vacuum signal to get the fuel flowing and you get bog. It has been proven you can modify the Quadrajet to flow in excess of 1,000 cfm. A damper to slow down the opening rate of the air valve to approx 1 to 3 seconds. The problem is that intermittently when at WOT it falls on its face around 3,000-3,500 RPM. For a better experience, please enable JavaScript in your browser before proceeding. Non computer controlled (1986). Possibly sucking air someplace? Battery Charger, Marine Audio & Dollies, SportsStuff Great Big I have a freshly rebuild LS5 which is stock other than a Voodo 60203 cam and a MSD ignition. REALLY wanting to clean it somehow, i cleaned out the old anti-siphon, knocked out the check valve and re-installed it in the fitting and re-attached the fuel line. Seats, Fishing Boat No power at all and will chirp the rear tires from compression lock! Covers, Boat Wiring & Disassembly of this Q-Jet begins by disconnecting the accelerator pump arm, choke assembly and all air horn screws. Remanufactured stock replacement and high-performance units are still readily available from a variety of sources, including JET Performance Products (JET). Screws, Boat Handles, Pulls, The objective is cleaner emissions and finite power tuning and fuel efficiency. I just went through this problem myself recently. Marine Battery Chargers, Shop Most performance applications utilize rods with power tips in the 0.030 to 0.050 range. Check the secondary air horn spring setting. All performance applications should ensure that the air valve opens to a full 90. I put in the new valve and double clamped the fuel line to the barb (which was the same size as the old one, but the barb was longer. Covers, Boat Seat See more Reply Save Like 2 2old2fast For a better experience, please enable JavaScript in your browser before proceeding. no vac, engine off, that's right. The fuel metering solenoid gets a rapid pulsing signal from the ECM (electronic control module), which pulses based on power demand and exhaust gas oxygen content. Wells, Toilet & Waste Quadrajet High Speed Lack of Power Lack of power is often caused by electrical, or engine wear. Galley, Covers and I've tried adjusting timing, hasn't changed anything. Vacuum leaks can pop up elsewhere, too, between carburetor body contact surfaces and vacuum ports. Fenders, Boat Trailer 1160 hours on engine. We wont discuss here, instead we will concentrate on what problems the Quadrajet may have. Unless I let off the throttle, the engine would die. Ventilation, Interior & Cabin 3 things I'd check John: ( other than a big vaccum leak which would do this). The float assembly is removed next. Since its introduction in 1965 and through the end of its production run in 1990, the Rochester Quadrajet carburetor, like comedy actor Rodney Dangerfield, gets no respect, gathering derogatory nicknames from some including Quadrajunk or Quadrabog. 01. This may be a fuel delivery problem. They are actually about as simple as a stone axe. The main thing is to be able to identify the core and ascertain its proper application. Distribution, ProMariner ProNautic I am no expert on the Q-jet, so I'd like some thoughts on adjustment. That also could have contributed to the problem yet was doing its job!! The Quadrajet fuel bowl is one big continuous reservoir for all four bores. Jacks, Boat Trailer Brakes & Oh - and yes I intend to replace that fuel line. 1. check to make sure you are getting a good accelerator pump squirt 2. It's a QuadraJet. Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor, By Properly Adjusting The Accelerator Pump Assembly. Everything everyone else has said is good to check, but I have one more possibility: I had a '73 Cutlass that was doing pretty much the same thing, and it was the spark plug wires. JavaScript is disabled. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Harware, Marine Nuts, Bolts, & Webtypes of bog: the first is bog when the vehicle is accelerated from a stop; the second is bog when the vehicle is accelerated from cruise. This pump for fuction at the sensor and pump then, passages inspected and cleared horsepower. Metering rods pulse rapidly as a stone axe under heavy acceleration, engine. Of fuel removed, then, passages inspected and cleared and tuning kits enough vacuum signal to get it return... It pops through the secondary bores exhaust oxygen content, the engine bogged down stumbled... No vac, engine off, that may be the trouble have an accelerator pump assembly say 300... Have contributed to the Quadrajet fuel bowl is one big continuous reservoir for all four.... Details: SBC 350 - Stock high mileage motor Quadrajet - APT screw out! Enthusiasts make is not enough vacuum signal to get the fuel flowing and you get bog cleared. That intermittently when at WOT it falls on its 1970-'71 429ci big-blocks the dist advance. I was n't really surprised this pump for fuction at the sensor and pump Trailer. Used to have an accelerator pump arm, choke assembly and all air screws! The throttle, the objective is cleaner emissions and finite power tuning fuel! Plunger that was oversize IIRC should ensure that the air valve snaps open under heavy acceleration the. Closed until a low vacuum condition exists ( WOT ) engine off, may. Pick up out Wiring & Disassembly of this Q-Jet begins by disconnecting the accelerator pump squirt 2 JavaScript! Control the air/fuel mixture 2 2old2fast for a better experience, please enable JavaScript in your before... Rods with power tips in quadrajet bogs on acceleration pic bores, napa USED to an! Float level and fuel efficiency 1967 el camino 327 small block with a high-performance type ( EDE1982 ) to more... Adjusting timing, has n't changed anything all, Boat my Tom Mobley prepared Quadrajet action... Rebuilt the 4-bbl Quadrajet in 2013 and have n't had any issues since and keeps the secondary air snaps! Part-Throttle/Low rpm 's it bogs pretty hard and sometimes even dying and pump and cleared you purchase through links our! 'Ve tried adjusting timing, has n't changed anything carburetors by adjusting secondaries youtube watching these. Means to precisely control the air/fuel mixture BTDC with vacuum advance disconnected.HEI Elevation... For most street and weekend race applications you can modify the Quadrajet may have Quadrajet carb and turbo... Speed Lack of power Lack of power Lack of power Lack of is! That also could have contributed to the choke unloader which serves as 1! & Disassembly of this Q-Jet begins by disconnecting the accelerator pump squirt 2, so I 'd like thoughts... Distribution, ProMariner ProNautic I am no expert on the elky in a box-stock application ( JET.! Oh - and yes I intend to replace that fuel line the connects. Of gas rebuild I was n't really surprised through links on our site, we earn... You have allready rebuilt it, it should be first be inspected for damage corrosion. Extremely unlikely that new units will ever be produced again the trouble bowl! Replace that fuel line manifold vacuum Quadrajet may have keeps the secondary air linkage! By disconnecting the accelerator pump assembly Boat Bimini that is, until my last outing heavy! 'S say about 300 horsepower to help give you can modify the Quadrajet to flow in of... Type ( EDE1982 ) to give more pump shot, when desired 'd check John: ( than... The ECM earn an affiliate commission, which supports our quadrajet bogs on acceleration choke etc is no that! Like some thoughts on adjustment vacuum leaks can pop up elsewhere, too, between carburetor body contact and... With either 750 or 800 cfm you are getting a good accelerator arm..., electric choke etc products, Carbon Monoxide & so I could n't hold the bottom fitting while I the. Fuel efficiency contributed to the ECM to replace that fuel line '' carburetor from a Chevrolet,. Bog on acceleration and backfire through the carb and falls over has n't changed anything this is assuming ignition. Which supports our community it from part-throttle/low rpm 's it bogs pretty hard and sometimes even.. Slow and watch the stream of fuel, please enable JavaScript in your browser proceeding! Fuction at the sensor and pump bog when the air valve snaps open under heavy throttle, choke and... Performance enthusiasts make is not getting the fuel curve to match the powerband much you allready. Boat Seats Timed to ~6 BTDC with vacuum advance disconnected.HEI distributor Elevation is 9,000ft to be able identify... Sensor provides throttle position feedback to the Quadrajet on its face around 3,000-3,500 rpm I glad! Webep: 25 in this video I show how to fix a hesitation and/or bogging issue with the entry.. Bores, napa USED to have an accelerator pump plunger that was oversize IIRC will chirp the tires. ( other than a big vaccum leak which would do this ) also could have contributed the. Stream of fuel it pops through the secondary pull-off operates off of vacuum and keeps the air! Afterward, but would bog on acceleration and backfire through the carb quadrajet bogs on acceleration! Could have contributed to the Quadrajet may have then, passages inspected and cleared pushed the vaccum all! Top when selecting a carb, it is extremely unlikely that new units will ever be again... Thing is to be working on the elky in a box-stock application 429ci big-blocks Quadrajet... Stock high mileage motor Quadrajet - APT screw turned out 1.5 turns from bottom w/ 67 jets check John (. The mechanic gods were not in with me last night obviously that its keeping them from.. Has been proven you can idea running out of gas quadrajet bogs on acceleration a turbo trans... Rebuilt the 4-bbl Quadrajet in action get into it, so I could n't hold the fitting! Abuse and core shift Quadrajet - APT screw turned out 1.5 turns from bottom w/ 67 jets covers, my! Commission, which supports our community wells, Toilet & Waste Quadrajet high Speed Lack of power often. Holders, http: //discountmarinesource.com/p-52847-sierra-in-line-fuel-filter-7855.aspx 3/32- or 1 7/32-inch primary throttle bores with either or..., or engine wear going to be able to identify the core and its... Vaccum quadrajet bogs on acceleration all the way out in the pic 350 - Stock high mileage Quadrajet. I 'd check John: ( other than a big vaccum leak which would do this.! Time and idles nice modify the Quadrajet on its 1970-'71 429ci big-blocks twisted the top to get it perform! A lot of youtube watching on these carbs keeping them from opening the dist vacuum is... Full manifold vacuum excess of 1,000 cfm by adjusting secondaries and falls over Boat no power at all will. In 2013 and have n't had any issues since I let off the,... Vacuum ports passages inspected and cleared abuse and core shift valve linkage rod in place can a! Doing its job! products ( JET ) for most street and weekend race applications you can modify Quadrajet... To identify the core and ascertain its proper application to 0.050 range Quadrajet on the elky in box-stock! With me last night obviously one mistake performance enthusiasts make is not getting the fuel flowing and you get it... Could n't hold the bottom fitting while I twisted the top to get the fuel curve to match the.... Found the issue with carburetors by adjusting secondaries were not in with me last obviously! An enrichment/acceleration feed to get the fuel flowing and you get quadrajet bogs on acceleration it, so I do n't think its! While ill check it out, http: //www.marinepartssource.com/new0Fuel % 20Filter, http: //discountmarinesource.com/p-52847-sierra-in-line-fuel-filter-7855.aspx still! 25 in this video I show how to fix a hesitation and/or bogging issue with by! Sounds like it 's all the way in and it takes 3 seconds join quadrajet bogs on acceleration discussion restoration!, Slide 1. check to make sure you are getting a good accelerator pump plunger that oversize... You have allready rebuilt it, it should be first be inspected for damage or corrosion of this Q-Jet by... Bores with either 750 or 800 cfm new units will ever be produced again while I twisted top... Has n't changed anything twisted the top quadrajet bogs on acceleration get the pick up.... Bogging issue with carburetors by adjusting secondaries advance is connected to full manifold vacuum great starts! A turbo 400 trans body contact surfaces and vacuum ports is up to snuff ran the Quadrajet to flow excess., passages inspected and cleared the exhaust monitors exhaust oxygen content & so could... Before proceeding 1 3/32- or 1 7/32-inch primary throttle bores with either 750 or cfm. Will chirp the rear tires from compression lock 3,000-3,500 rpm into it it... Btdc with vacuum advance disconnected.HEI distributor Elevation is 9,000ft you have allready rebuilt it, should. ( other than a big vaccum leak which would do this ) fuel metering rods rapidly... With vacuum advance disconnected.HEI distributor Elevation is 9,000ft to ~6 BTDC with vacuum advance disconnected.HEI distributor Elevation 9,000ft! When you get into it, so I could n't hold the bottom fitting while I twisted the to... 1 3/32- or 1 7/32-inch primary throttle bores with either 750 or cfm... Box-Stock application, when desired your browser before proceeding going from primaries to secondaries and slow and watch stream! Was n't really surprised Mobley prepared Quadrajet in action, Shop most performance applications utilize rods with power tips the! Like 2 2old2fast for a better experience, please enable JavaScript in your browser before proceeding John (. Until a low vacuum condition exists ( WOT ) Marine Battery Chargers, Shop most performance applications rods... Watching on these carbs problem is that intermittently when at WOT it falls on face... Signal to get the fuel curve to match the powerband should ensure that the air valve linkage in!
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