Engine/Transmission (1994 - 1998) weird idle

[RonA]

For the last month or so my truck has been idling weird. Really noticed it tonight. I had a roller cam in my old '60 Corvette, and it idled fast and un even almost like it was missing on one cylinder This is similar. I'm also getting a fluctuation in my voltage meter that seems to keep time with the uneven idle . This is my second motor in this truck. The old first gen motor purred at idle, this p-pump conversion has always been rougher at idle. I have had the head off several times. If I was to ding an injector nozzle slightly, could that cause this. Could the uneven idle cause the voltage meter to bounce? I checked the voltage at idle with a meter and it is fluctuating just like the meter in the dash. I installed a new voltage regulator and the needle still bounces around. Would appreciate any suggestions.

RonA

 

[BPonci]

You should always remove the injector before pulling the head to prevent that of happening. A nozzle not fireing properly will cause a hit and miss idle. BTW stomp blew his head gasket last night at the track. He was getting ready to race a viper when he found coolant leaking out from under his truck.

 

[Howard Durand]

Disconnect the two relays that control the intake heaters. It sounds like they could be cycling which would cause the voltmeter to fluctuate.

That could cause a change in idle speed as well.

Worth a try.

 

[Joe G.]

If the idle is too low it can do that. If you have an automatic the idle should be 750 to 800 RPM in gear with the AC on. A manual should be 750 with the AC on.