help...my car has a misfire under a hard load - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 05-15-2008, 02:19 PM   #1
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Default help...my car has a misfire under a hard load

when i floor it my car struggles,it sounds like a missfire.this hapends right whe the vaccum/boost gauge needle hits 0.before the 0 mark it wrks fie,ut when u hit boost,it works like crap!!what can the problem be? 93 SSEi
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Old 05-15-2008, 03:37 PM   #2
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Let'* start by checking fuel pressure. We need to know:

1. Key on (no start) for 2 seconds, repeat three times (key on, wait 2, key off, key on, wait two, key off, key on, wait two, key off). What'* the gauge say after the 3rd cycle?

2. At idle. How much pressure?

3. At idle with the vac line pulled off the FPR. What'* the pressure?
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