95 LT1 Rough Idle
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From: Northern Colorado
95 LT1 Rough Idle
Hello all. Looking for direction on where to start to diagnose what the hell went wrong. After 20 mile blast canyon carving the other day sitting at a light coming home, a distinct change in the idle and overall feel of the engine abruptly started. I can feel a vibration in my seat and steering wheel. Same under acceleration and also a loss of power. No codes and same top tier fuel I've always used. Is it time to source obd1 data log software and compatible cable. I don't want to just start tossing parts hoping to stumble into a fix. Any and all input is appreciated. Thank you.
Last edited by steve1657; Jun 8, 2016 at 10:12 PM.
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From: Lansing MI
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Thread Starter
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From: Northern Colorado
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From: diamond bar ca
check codes, p0118 will give same symptom do you have hard start and you said you had a rough idol,, do the fans come on when they dont need to be on. this would be a symptom of a bad etc, replaced my coolant sensor still did it, turned out to be a loose connection on plug to sensor, replaced plug now good,
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Joined: Jan 2015
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From: Northern Colorado
check codes, p0118 will give same symptom do you have hard start and you said you had a rough idol,, do the fans come on when they dont need to be on. this would be a symptom of a bad etc, replaced my coolant sensor still did it, turned out to be a loose connection on plug to sensor, replaced plug now good,
No codes and fires right up as it always has. Idle is rough, although the tach doesn't jump at all. Might just be the typical calibration. I was just out looking while grilling and my number 1 wire had rotated and was resting on the manifold shield. I can feel a decent cut in the wire and polish to the shield in same spot. Looks like I get to replace wires at 40k... but I have not tested or restarted yet to look for an arch.
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Hello arrowsmith. Thanks for input it is all appreciated.
No codes and fires right up as it always has. Idle is rough, although the tach doesn't jump at all. Might just be the typical calibration. I was just out looking while grilling and my number 1 wire had rotated and was resting on the manifold shield. I can feel a decent cut in the wire and polish to the shield in same spot. Looks like I get to replace wires at 40k... but I have not tested or restarted yet to look for an arch.
No codes and fires right up as it always has. Idle is rough, although the tach doesn't jump at all. Might just be the typical calibration. I was just out looking while grilling and my number 1 wire had rotated and was resting on the manifold shield. I can feel a decent cut in the wire and polish to the shield in same spot. Looks like I get to replace wires at 40k... but I have not tested or restarted yet to look for an arch.
Last edited by PatternDayTrader; Jun 10, 2016 at 01:07 AM.
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Installed new wires today, cleaned up the idle and she is running great with good power. makes me wonder how long that may have been causing an issue with spark as i feel like i can drive it like i stole it again! Thank you omotoxracer and ant for the tips and suggestions. 
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Installed new wires today, cleaned up the idle and she is running great with good power. makes me wonder how long that may have been causing an issue with spark as i feel like i can drive it like i stole it again! Thank you omotoxracer and ant for the tips and suggestions.
good job