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Forum: C4 ZR-1 Technical Postings 04-08-2010
Replies: 9
Views: 3,069
Posted By Hotrod
Re: Looking for Help

There is a small check valve on the vacuum pump hose, under the plenum, to prevent the pump from trying to pull a vacuum while the engine is stopped. Sometimes this valve goes bad. Try...
Forum: C4 ZR-1 Technical Postings 07-02-2007
Replies: 4
Views: 3,501
Posted By Hotrod
Re: Pulstart Pluse Plug (Spark Plug)

Being an Electrical Engineer for the past thirty years.... these plugs are BS!!!. The company can't even use the terms: voltage, or power in proper usage. Volltage doesn't heat a thing!!!. The...
Forum: C4 ZR-1 Technical Postings 09-16-2006
Replies: 13
Views: 2,763
Posted By Hotrod
Re: Help ! Oil in spark plug slot

FYI: There is an "O" ring seal between the the heads and the valve (cam) covers. When the seal goes bad, oil from the cams, works its way up around the spark plug (outside) and wets things down...
Forum: C4 ZR-1 Technical Postings 09-16-2006
Replies: 11
Views: 2,289
Posted By Hotrod
Re: Failed emissions test

Ron... FYI, the 91 does not have an EGR valve which cools the combustion to lower the NOx emissions. I would check that the car is meeting the GM spec for it's model year ( that's the best the car...
Forum: C4 ZR-1 Technical Postings 03-09-2006
Replies: 8
Views: 2,830
Posted By Hotrod
Re: Console Hatch Release

FYI: There is a safety interlock which prevents the console switch from activating the hatch release unless the E-Brake is applied. Make sure the E-Brake is set when trying the console switch. ...
Forum: C4 ZR-1 Technical Postings 01-25-2006
Replies: 34
Views: 6,666
Posted By Hotrod
Re: T-stat question

FYI: You can use the a/c display to read engine coolant temp.
Forum: Corvette Audio/Electronics 12-20-2005
Replies: 28
Views: 13,207
Posted By Hotrod
Re: mailed radio for repair today.

My hands are still hurting from replacing the cdm box... and that was 2 years ago!
Forum: C4 ZR-1 Technical Postings 12-20-2005
Replies: 20
Views: 8,836
Posted By Hotrod
Re: Brake Bleeding Advice

Becareful when using the vaccuum method for bleeding the brakes.. when the vaccuum is applied and the bleeder screw loosened, air can be sucked in around the threads of the bleeder screw and end up...
Forum: C4 ZR-1 General Postings 09-18-2005
Replies: 259
Views: 48,127
Posted By Hotrod
Thumbs up You can count me in for a black one. 1991 #1184

You can count me in for a black one. 1991 #1184
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