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Old 03-03-2014, 02:14 PM
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Running rough

To start off my truck is a 95 auto, ts chip, 4 inch exhaust 377,000 kilometers.
My problem is I was driving today came to a red light and was about to take off and then my truck started slightly shaking like it was mis firing? Now it is running rough and the motor is noisier than usual. I pulled over shut the truck off. Nothing under the hood seemed unusual, there were no new leaks or smoke coming from anywhere. I checked the oil and coolant and both seemed fine. I am using schaeffer's full synthetic 15w40 and have put on about 3000kms since I last changed it, and fuel filter was done at the same time. Also when my truck started to run rough I didn't notice any difference in EGT temps, trans temp, or oil temp. No check engine light came on and no codes came up using my CTS insight. Any suggestions or help?? Thanks
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Old 03-03-2014, 02:37 PM
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If you let it sit does it run better? Could be UVCH issue (Under Valve Cover Harness). Also could be IDM (Injector Drive Module) which is the computer mounted on the driver inner fender under the hood.


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Old 03-03-2014, 02:39 PM
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I just drove it home about an hour ago and it's been sitting since. I haven't started it back up yet. If it does run better what would that mean? And how can I tell if it's the idm or uvch?
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Old 03-03-2014, 03:07 PM
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We'll start simple. Try unplugging the icp sensor on the drivers side cylinder head and see if that makes a difference. Its a 3 wire plug on the top in the front.


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Old 03-03-2014, 06:52 PM
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Unplugged the icp and only difference was the check engine light came on
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Old 03-03-2014, 07:08 PM
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You dont have a scanner i take it? Try wiggling the valve cover harnesses while its running and see if it changes anything.


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Old 03-03-2014, 07:10 PM
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No I don't. The only way I can check the codes is with my edge cts
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