Hot #5 HDR Primary
07-11-2006, 11:48 PM
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Car: 1990 IROC-Z
Engine: 383 HSR
Transmission: 700R4
Axle/Gears: 3.70
Hot #5 HDR Primary
Ive been doing a lot of tuning lately and discovered my #5 header primary is running approx 125 deg hotter than all other cylinders. I've eliminated the injectors as culprit and am now thinking it is a valve problem? The #5 plug looks like all the others, light tan fading to white. You guys got any ideas?
07-12-2006, 08:51 AM
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Car: 1990 IROC-Z
Engine: 383 HSR
Transmission: 700R4
Axle/Gears: 3.70
I believe I eliminated a vacuum leak also. I used the Propane method all around the base of the manifold. My only thought with that is, what if it's leaking from the intake valley side? I'm not sure how to check for that? My vacuum gauge reads steady, between 11-12 in HG in Park, at idle. Keep the thoughts coming...
07-16-2006, 02:00 AM
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Car: 1990 IROC-Z
Engine: 383 HSR
Transmission: 700R4
Axle/Gears: 3.70
Well despite the hot #5 header temp, I ran the car at the track yesterday. No signs of any problems while it laid down some awesome 12 sec runs. If you got any ideas why one cylinder would run so hot, send em. Thanks
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