Quote:
Originally Posted by MuRCieLaGo
1991 ZR-1
Hello guys,
I will explain my problem on this thread now.
I just bought the car yesterday and I drove the 800 kms back home.
Intermittent Service Engine Soon light.
When I come to stops or red lights, engine has a hard time going at idle.
50% of time: engine dies. I can start it back (I need to crank a bit longer but it starts).
Other 50% of time: idle goes to 500 rpm, go back a bit higher than 1,000 rpm, bounces for some seconds and then sets to normal idle (800?).
When it is cold, I don't have the problem at all (tested only this morning, can't tell if it is always like that).
Plus, I don't know if it has something to do with that problem, but when I go at WOT at around 75 mph (6th speed), the engine has a hard time going higher in RPM. WOT at 3,000 RPM at pretty much any speed is hard (it bucks, feels like misfires). WOT at 4,000 RPM and higher is nice and smooth.
Seller said:
-Plugs have been changed last year.
-Injectors have been changed last year.
No receipts at all. I know he's a honest guy though, no question there.
Anybody can help me? These LT5s are intimidating, I've a lot of stuff to learn there.
Thanks!
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Post title says "code 31". Is this the code you are seeing with scanner or using pin grounding method? Faulty or disconnected cam position sensor will exhibit symptoms you are describing.
First check the cam position sensor connector - from cam position sensor on driver side head (on the side) wrapped in 1/4" black flex conduit to a weatherpak plug above the brake booster. If connected, you may need a new sensor.