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Forum: C4 ZR-1 Technical Postings 12-20-2013
Replies: 22
Views: 5,062
Posted By rollinsperf
Re: Miss after 5 min, runs great over 3000 RPM

Snap-on MODIS, I watched the O2 sensors and after it warmed up on 1 the crosscounts went up and the other it went down eventually to 0. The scanner is not as fast as a lab scope, but it got the job...
Forum: C4 ZR-1 Technical Postings 12-13-2013
Replies: 22
Views: 5,062
Posted By rollinsperf
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
Forum: C4 ZR-1 Technical Postings 12-13-2013
Replies: 22
Views: 5,062
Posted By rollinsperf
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,...
Forum: C4 ZR-1 Technical Postings 12-04-2013
Replies: 22
Views: 5,062
Posted By rollinsperf
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
Forum: C4 ZR-1 Technical Postings 12-04-2013
Replies: 22
Views: 5,062
Posted By rollinsperf
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...
Forum: C4 ZR-1 Technical Postings 12-04-2013
Replies: 22
Views: 5,062
Posted By rollinsperf
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...
Forum: C4 ZR-1 Technical Postings 11-21-2013
Replies: 22
Views: 5,062
Posted By rollinsperf
Re: Miss after 5 min, runs great over 3000 RPM

Just as much as I am since I'm doing this in my time off. But if you're ever in Sarasota, I'll buy you a cup of coffee
Forum: C4 ZR-1 Technical Postings 11-21-2013
Replies: 22
Views: 5,062
Posted By rollinsperf
Re: Miss after 5 min, runs great over 3000 RPM

I wasn't part of the plug change, or ohming the wires, but I can certainly dielectric grease the boots easily enough. The wires were replaced with the 1st set of injectors 3 years ago but only have...
Forum: C4 ZR-1 Technical Postings 11-20-2013
Replies: 22
Views: 5,062
Posted By rollinsperf
Unhappy Miss after 5 min, runs great over 3000 RPM

I'm working on Ali's 91 ZR1 that he brought to the shop after it sat for 3 years.
Runs fine for the 1st 5 minutes then runs like spark scatter in a distributor or a rev limiter until it hits 3000...
Showing results 1 to 9 of 9

 
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