Hard start, slight misfire
#1
Hard start, slight misfire
I have a 94z28 that I just did an engine swap and cam and tune in. Finally got done and car won't start unless I press gas pedal nearly to floor. After a few seconds of revving the car finally idles by itself but when I hit the gas again it seems to bog/misfire. Anything about 2,500 rpms it no longer bogs/misses. The tune is from pcm4less and all new plugs wires and opti. Any ideas???
#4
Re: Hard start, slight misfire
Have you tried resetting the IAC position using the procedure on shbox's site?
4th Gen LT1 F-body Tech Articles
4th Gen LT1 F-body Tech Articles
#5
Re: Hard start, slight misfire
If you hold the accel pedal to the floor, BEFORE you turn the key to "start", and hold it there until the engine starts, it may indicate a problem with flooding. The pedal on the floor puts the PCM in "clear flood" mode, reducing the addition of fuel during startup. Could be the leaky injectors, could be the coolant temp sensor not telling the PCM the engine is warm, could be a closed IAC valve.
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Alex Barnes
LT1 Based Engine Tech
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01-24-2015 10:21 PM