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1 Posts
I have a 96 caprice 5.7 I just replaced plugs,wires,distributor and coil. But she is still staring hard and running rough any idea what else it could be
Misfire and hard start
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What is your fuel pressure?
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3,118 Posts
Damn skippy.
Some cheaper easier to remove-&-replace ideas:
fuel pressure regulator?
ignition coil driver module?
Opti electrical harness?
Opti- Vent & Vacuum Harness? (far too often overlooked)
Not suggesting that you throw parts at the problem.
If you do, start with the cheapest / oldest / easiest stuff first.
Hey I figure fuel pressure might be easy to check for some lol
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3,118 Posts
'Damn skippy', as in 'I wholeheartedly agree indeed'.
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3,118 Posts
I agree here as well, but some people, for whatever reason, don't.
For those people, I recommend firing the Parts 'Derringer' before firing the Parts Cannon.
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49 Posts
I just had the same symptoms, additionally throwing up P0171 codes. After replacing the fuel pump twice and not fixing the issue, my shop diagnosed a voltage drop to the fuel pump and cleaned all chassis grounds. That seems to have fixed the problem, the old gal hasn't run this good in years.
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35 Posts
Investigating the fuel delivery, especially the fuel pump, would be a good idea.
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3 Posts
Try cleaning the connector that plugs into the Opti spark, I had the same problems and even replaced my fuel pump before tracking down the issue lol
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