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LT1-LT4 Modifications 1993-97 Gen II Small Block V8

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Old May 31, 2010 | 10:20 AM
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ok so i am getting a misfire and my ses light is on. p300 random misfire detected.
i put a fuel gauge on and at idle im at about 30psi and at wot im at 37psi it that a problem ? where should i start ?
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Old May 31, 2010 | 10:25 AM
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Spark Plug wires...

Mine was the last one passenger side.

can you hear a tick???
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Old May 31, 2010 | 10:32 AM
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Originally Posted by Bajapat
Spark Plug wires...

Mine was the last one passenger side.

can you hear a tick???
checked all the wires and they were replaced last month
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Old Jun 1, 2010 | 09:50 PM
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bump!!
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Old Jun 13, 2010 | 04:12 PM
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bump ttt
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Old Jun 13, 2010 | 04:56 PM
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just because new parts were installed means that "they" are not culprit. I highly doubt fuel pressure or fuel flow is the problem, fuel pressure will vary depending on vacuum if the line is installed. check simple, most likely things first, and of course more info on the conditions that are needed to reproduce the miss will help us
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Old Jun 13, 2010 | 05:51 PM
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possible spark plugs arcing, have you checked those?
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Old Jun 13, 2010 | 08:16 PM
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ill check the car at night to see if i see any arcing. as for the misfire is happens all the time really bad at idle tho

thanks for the replies guys
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Old Jun 13, 2010 | 08:24 PM
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check the plugs, and if you've ever had your opti-spark off theres two bolts in there that if you dont locktite them they will back out and cause a miss.
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Old Jun 13, 2010 | 08:43 PM
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Originally Posted by 95firebird5.7
i put a fuel gauge on and at idle im at about 30psi and at wot im at 37psi it that a problem ? where should i start ?
Take the vacuum off the fuel pressure regulator and test pressure again. It should be between 43 and 45psi. I believe GM states 43.5psi.
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