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Hesitation off idle all the time and dying when not

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Old

04-21-2012, 12:19 AM

 

jedblanks

     

Join Date: Apr 2012

Posts: 5

 
 

Hesitation off idle all the time and dying when not

87 grand national
Changed IGN Module and Coil Pack
Changed PCV Valve
Changed Wires, Plugs gapped at .035
Changed TPS
TPS Set to .39, WOT voltage 4.6x
Swapped with a known good MAF
Changed air and fuel filter.

Has an off idle stumble/hesitation and if I rev it in park, it either dies or almost dies when returning to idle. Worse when warm (160 degrees plus and electric fan on)

Car smokes, looks like oil smoke smells rich. Comes out exhaust and turbo. Wasn't smoking before the troubleshooting started on the idle / hesitation problem.

I tried swapping ECM, and it idled better but the SES light stayed on and wouldn't give me a code.

PROM has "Lou's Performance" written on it.

Not sure what to do at this point. I've thrown everything at this thing I can think of and it seems my problems are getting worse rather than better.

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04-21-2012, 01:34 AM

 

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Keller

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Re: Hesitation off idle all the time and dying when not

Quote:

Originally Posted by jedblanks

Car smokes, looks like oil smoke smells rich. Comes out exhaust and turbo. Wasn't smoking before the troubleshooting started on the idle / hesitation problem.

 

I have a suspicion that you have a leaking or failed gasket. Likely an intake or head gasket. And if that is the case, the issues it causes will only get worse and not better until it is changed.

Have you done a compression or leak-down test?

Do you know what injectors you have? Of if the chip is cut for them? The second ECM may be bad. If the SES light is on there should be an error that accompanies it. Have you checked for one?

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04-21-2012, 10:27 AM

 

jedblanks

     

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Re: Hesitation off idle all the time and dying when not

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