But it's NOT an E4ME, it's a 2 barrel and while they do have some adjustments that may effect fast idle they do not have a fast idle cam. Nor the linkages associated with one that could stick.
Throttle/Carb issue (Phantom accel)
- Thread starter SupremeKing84
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On my car idle air fuel mixture screw was rusty and same symptoms. Thought I had a vacuum leak. Turned out theres an alternative way to hook up the vacuum lines to gain a little acceleration. When I put the vac hoses back to stock config the car didnt run as well as before. I think you were on the right track w/ the carb rebuild. Don't touch the vac hoses I regretted touching mine. 8 hours of work for 0 hp gain. Then I had to set it to stock and it ran worse than the way it was set up before/
What type of carb is it then? A dualjet? CCC or non CCC? My old e2me dualjet has a fast idle cam adjustment like the e4me Qjets. Since Supreme's car is an 84, it should have a e2me Djet. However my old Djet is an 86 so it may have a few upgrades over an 84 Djet?
"Phantom acceleration" sounds alot like surging. Lean mixtures can cause an engine to accelerate.0 Vacuum leaks around the throttle shafts can certainly cause "Phantom acceleration".
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Fuel is a variable that can easily be changed I'm sure that's probably not the issue. That said, many gas stations just switched to 'summer blend' fuel w the false expectation of warmer weather by now. I would figure out what vac line is safe to d/c and do a smoke test for a bad manifold gasket if the carb / vac lines search comes up empty. If you slap a carb your sure is good on there and same thing is happening, it could be intake manifold gasket. It cost me about 200 because mine was cracked so we took a used off a 307 w low miles. Not an expensive problem to solve by any means either, cost about the same as rebuilding the carb so dont panic. *_^
Its a Rochester Dual Jet, Also I've noticed that I could push the throttle forward a bit like to a closed position at the carb and the rpms would drop...so I'm assuming the throttle plate stays open a little
Like I first suggested it looks like the fast idle is stuck. Pull the lever (marked by the red arrow) forward to pull it off the fast idle cam and that should drop the revs. Rev the engine a little and gently pull the lever if the lever won't move. You'll need to find why it is sticking though but it probably just needs to be cleaned.
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It is also a good idea to test the TPS, a bad TPS can cause weird driveability problems. Anytime you readjust the idle speed, the TPS will also need to be checked and probably adjusted too.
pontiacgp has you on the right track. That's the same pin that got stuck on mine. I don't know about you, but even with longer than avg arms I found it annoying to finnagle w/ that, which is how I ended up at the carb rebuilding stage next. It's just impossible to fix that pin w/o taking the whole carb off and getting a better view. Sent it in, ended up just swapping to a rebuilt one and calling the 1st one a core exchange to save time and get back on the road faster. Not sure what clone tie is talking about, my rochester didn't seem to have a TPS but his car has a 305 chevrolet so it might be different than the v6 carb.
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