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#1
07-09-2010, 08:19 PM
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Accel Pedal Hang Up
Here's the issue fella's. I have a 69 GTO with a 400 that has a 750 Q-jet out of a 73 Buick sitting on the top of it. The carb has been rebuilt by the previous owner and the engine runs great. The problem I am having is when I jump on the skinny pedal quickly. I will feel a physical hang up in the pedal travel. When I hit that point the car hesitates for a split second until I get past it, then it roars to life in all of its tire melting glory. Now if I gradually transition to wot then I get no such hesitation or hang up, its only when I am quick with it.
Am I feeling a normal hang up in pedal travel as I hit the secondaries? Am I feeling an accelerator pump issue? Am I feeling a hang up in the throttle linkage? Do I scrap messing with the old q-jet and just get a new Edelbrock? Thanks for the help, Tony |
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#2
07-11-2010, 04:00 PM
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Test the linkage manually. If it is free it may be time for a new cable, which is still available for about $50 from gmpartsdirect.com. Number 9791207.
__________________
-Jeremy 1968 GTO 4-spd convertible, console, factory gauges, hidden headlights, 3.90:1 posi, AM/FM radio. 1962 Catalina convertible, Starlight black w maroon interior & white top. |
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#3
07-12-2010, 08:03 PM
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2X what webfoot said. Most likely a broken strand in the cable that is catching on something.
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Its ok to giggle and snicker, Dont laugh and point |
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#4
07-13-2010, 10:04 PM
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If you disconnect cable at carb and have a helper keep resistance on it while you depress pedal and you feel resistance at same spot it is probably the cable. I personally think it's normal to feel additional resistance in pedal as secondarys start to open on a Q jet. Sounds like the secondary air valve spring needs a slight adj to eliminate bog/hesitation.
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Leo |
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#5
07-13-2010, 10:40 PM
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"Do I scrap messing with the old q-jet and just get a new Edelbrock?"
You have a great carb now why on earth would you want to replace it with something inferior?
__________________
Brad Yost 1973 T/A (SOLD) 2005 GTO 1984 Grand Prix 100% Pontiacs in my driveway!!! What's in your driveway? If you don't take some of the RACETRACK home with you, Ya got cheated    
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#6
07-15-2010, 10:19 AM
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Thanks for the help, I'll give the cable a good once over and go from there.
Tony |
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#7
07-15-2010, 07:55 PM
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Check the accelerator pump. Had this happen recently.
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#8
07-16-2010, 12:28 AM
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Did you buy it from Toyota...sorry couldn't resist.
Could be where the sleeve catches on the cable tube. Or also could be the circular hold in the gasket is just not large enough and the butterfly is getting stuck. Good luck.
__________________
 TigerEFI.com (Classic Pontiac Fuel Injection) 2004 GTO Company car, 1994 TA 25th Anv, 1971 Grand Safari Wagon, 1968 GTO EFI, 1968 GTO Stock, 1968 GTO Convertible in desperate need of restoration. |
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#9
07-16-2010, 04:16 PM
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Quote:
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