idle surge - Ford Muscle Forums : Ford Muscle Cars Tech Forum
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post #1 of 5 (permalink) Old 08-08-2010, 06:56 AM Thread Starter
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Location: tennessee
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Question idle surge

I have changed everthing possible at least once and still the car does not idle wthout surging abot 500 rpm difference,I have cleaned the salt and pepper connections twice,changed both wiring harnesses,iac,mass air,injectors,bap,went to 24lb. ijectors, c&l meter,o2 sensors and the things I have changed are new, 302 with stock trick flow Twisted wedge heads,holley systemax manifold, x cam,fule pressure is 40 lbs,there is just something there that I have not found. It seems to run rich even before i canged from 19 to 24 injectors.Any suggestions would be greatly appreciated.
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post #2 of 5 (permalink) Old 08-09-2010, 06:41 PM
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Re: idle surge

I battled this problem on my '88 with an hci swap. A surging idle can be caused by a vacuum leak. Check that first. If the C&L is located in the stock position, try clocking(rotating) the meter see if that helps. I ended up moving mine into the fender well with a Power Pipe and it ran much better. The sampling tube in the MAF does not get correct airflow in the stock position with the bend in the air intake tube before it(just my theory). Having it tuned is also good idea given the changes you've made. Spend your money with a tuner that will concentrate on making it run well around town, rather than just WOT. Or buy a PMS, tweecr or other programmer and learn to tune it yourself.

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post #3 of 5 (permalink) Old 08-09-2010, 06:55 PM
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Re: idle surge

Vacuum leak somewhere. Inspect ALL vacuum hoses and tubes leading to maf.
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post #4 of 5 (permalink) Old 08-10-2010, 09:24 AM
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Re: idle surge

Had and sometimes have the same issue with `94 GT with mild 331. Had a chip burned to run bigger displacement and 24's, at the time I asked for an idle of 700 rpm but it would hang up to 1100 for 30 secs and sometimes die. , so, I looked for obvious vacuum leaks with lpg enrichment-none found so I re-set up the throttle body adjustments as per BBK instructions. closing the air bleed helped a lot, disconnect the battery after wards for 10 mins or more and let it re "learn" now, 700 rpm most of the time with a hang up of 2-3 secs. air by pass screw is only open 1/2 turn. It's much better but not perfect. With a eec tuning device you can adjust the "decay" rate or dashpot setting and get it perfect.
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post #5 of 5 (permalink) Old 08-13-2010, 04:50 AM
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Wink Re: idle surge

I agree. It really sounds like you have vacuum leak. Be sure and check at the back of the intake manifold. I have fought the same battle with frustration.
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