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11-24-2013
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#11 |
 
Join Date: Sep 2013
Location: Charlotte NC
Posts: 654
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Re: Miss after 5 min, runs great over 3000 RPM
Any update seems I may have the same situation
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11-25-2013
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#12 |
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Join Date: Aug 2011
Location: Evergreen, Co.
Posts: 344
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Re: Miss after 5 min, runs great over 3000 RPM
Be sure you fill the spark plug boots fully to displace air with diametric grease. Hope this solves the problem.
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12-04-2013
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#13 |
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Join Date: Nov 2013
Location: Sarasota, FL
Posts: 9
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Re: Miss after 5 min, runs great over 3000 RPM
Well, after digging the ZR1 out finally, dilectric greasing the plug boots, and test driving with no change. Misfire within a quarter mile. Taped a fuel pressure gauge to the wind shield, test drive with 50 psi all the time, with or without the misfire.
Runs great when ice cold and above 3000 rpm. The miss is coming sooner and sooner. I guess when it doesn't run at all, it'll be easier to find. Help! |
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12-04-2013
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#14 |
  
Join Date: Jun 2005
Location: pittsburgh
Posts: 4,624
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Re: Miss after 5 min, runs great over 3000 RPM
heat induced ecm failure?
__________________
It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B" |
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12-04-2013
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#15 |
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Join Date: Nov 2013
Location: Sarasota, FL
Posts: 9
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Re: Miss after 5 min, runs great over 3000 RPM
I have been thinking overheating ECM for quite a white since I have seen it in Saturns and 1 Cadillac, but I hadn't seen anyone mention it. And since the normal flow chart answer of "test with known good part" is a little tough, I was waiting to see if anyone else has had an ECm related problem
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12-04-2013
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#16 |
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Join Date: Dec 2012
Location: NC
Posts: 1,783
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Re: Miss after 5 min, runs great over 3000 RPM
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12-04-2013
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#17 |
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Join Date: Nov 2013
Location: Sarasota, FL
Posts: 9
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Re: Miss after 5 min, runs great over 3000 RPM
Thanks for the heads up, I think I missed that one when I was looking through all the pages for answers
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12-13-2013
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#18 |
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Join Date: Nov 2013
Location: Sarasota, FL
Posts: 9
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Re: Miss after 5 min, runs great over 3000 RPM
I drove the ZR1 with a scanner on it yesterday and found that the RH O2 sensor went to .724 and stayed there. Shut the car off, drove it a little later, same thing. New RH O2 and the car runs great, so good that after an 8 mile thrashing I could finally verify the starter hot soak problem. 3 hours later, the starter would work again.
Thanks for all the great suggestions |
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12-13-2013
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#19 | |
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Join Date: Dec 2012
Location: NC
Posts: 1,783
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Re: Miss after 5 min, runs great over 3000 RPM
Quote:
FSM says that there should be changes in static pressure, dynamic, and in response to vacuum change... UP to 4 psi drop, maybe more, IIRC here. ed.: Yep - up to 10 psi less. Last edited by Schrade; 12-13-2013 at 01:00 PM. |
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12-13-2013
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#20 |
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Join Date: Nov 2013
Location: Sarasota, FL
Posts: 9
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Re: Miss after 5 min, runs great over 3000 RPM
50 under a load and when it was missing, 45 at an idle and cruise
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Linear Mode
