Shnalla Posted November 29, 2012 Share Posted November 29, 2012 Hi, I when I hit the gas pedal, at WOT, the carwill get stuck in full throttle... The carb is the stock Quadrajet (4MV I guess) that comes up with the L48 350. My friend who drove the car said that the linkage is loosen (see red arrow on the pic bellow). Do you have any recommendation ? I will drive the car back to my home soon... Thank you all Quote Link to comment Share on other sites More sharing options...
Mike 57 Posted November 29, 2012 Share Posted November 29, 2012 Have you checked for binding by opening the the throttle wide open while the engine is not running? Do you have 2 return springs? How do you get it unstuck? Quote Link to comment Share on other sites More sharing options...
wallaby Posted November 29, 2012 Share Posted November 29, 2012 That is a serious problem. At WOT it's hard to turn off the key and get the engine to stop. It's not a common problem with the Q-jet, but I've seen it before (1 time). With the carb that had this problem it turned out that it had a broken spring at the position marked "C" in your picture. Look closely. The linkage your arrow points to is for the accelerator pump. At the idle position it realy isn't pushing against anything and may be free to rattle around a bit. I'm not sure what you mean by it being loose...I've not seen one come undone. Quote Link to comment Share on other sites More sharing options...
bigtankjones Posted November 29, 2012 Share Posted November 29, 2012 My Quad did that a month ago that I have on my Wife's Firebird. Scared the Crap out of me. I wouldn't shut down. I had to try forcing the throttle closed by hand. Thanks for the info Mike and Mark. Quote Link to comment Share on other sites More sharing options...
Shnalla Posted November 29, 2012 Author Share Posted November 29, 2012 Have you checked for binding by opening the the throttle wide open while the engine is not running? Do you have 2 return springs? How do you get it unstuck? Hi Mike, Unfortunately I am not able to check anything. My car is stil in my friend's home... I will check the two springs on Saturday. My friend told me that he has to jump on the brake pedal and he turned off the key on then everything was ok. He as pretty scared ! Originally Posted By: wallaby That is a serious problem. At WOT it's hard to turn off the key and get the engine to stop. It's not a common problem with the Q-jet, but I've seen it before (1 time). With the carb that had this problem it turned out that it had a broken spring at the position marked "C" in your picture. Look closely. The linkage your arrow points to is for the accelerator pump. At the idle position it realy isn't pushing against anything and may be free to rattle around a bit. I'm not sure what you mean by it being loose...I've not seen one come undone. Hi Mark, Sounds like a broken or missing spring... I will get springs with me and Saturday I will check if anything is missing... When I say "loosen" I mean free to rattle. Can the accelerator pump rev the engine ?! Thank you all for your help. Quote Link to comment Share on other sites More sharing options...
stangeba Posted November 29, 2012 Share Posted November 29, 2012 Saw a Ford one time that stuck WOT, because the engine ground wire broke and the current was using the accelerator cable as a (poor) ground, melting the rubber case and causing the cable to stick. It may be the carb at fault but check everything, even the floor mat or carpet. Quote Link to comment Share on other sites More sharing options...
Shnalla Posted November 30, 2012 Author Share Posted November 30, 2012 Saw a Ford one time that stuck WOT, because the engine ground wire broke and the current was using the accelerator cable as a (poor) ground, melting the rubber case and causing the cable to stick. It may be the carb at fault but check everything, even the floor mat or carpet. As you say, I will check everything around accelerator. The ground wire broken is a crazy story... Quote Link to comment Share on other sites More sharing options...
stangeba Posted November 30, 2012 Share Posted November 30, 2012 Keep us posted so we can all learn. Bruce Quote Link to comment Share on other sites More sharing options...
Shnalla Posted December 6, 2012 Author Share Posted December 6, 2012 Hi, I finally got my Monte Carlo ! The carb work well now. In fact it was not a Quadrajet but a simple Rochester 2 valves... Here is a pic : The part with a blue arrow (sorry I do not know the name...) was the problem... A bad tuning was causing the rod to go out... Quote Link to comment Share on other sites More sharing options...
wallaby Posted December 8, 2012 Share Posted December 8, 2012 Can't remember if those had a jesus clip on them. (that's the choke rod for the fast idle cam). I love those carbs... they are normally bullet proof. Not a powerhouse, or even ecinomical, but seem to last forever. Quote Link to comment Share on other sites More sharing options...
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