There is an actual vibration on the smog pump/mount support bracket when the noise is present. I am wondering if one of the air valves being bad would cause a "pressure" problem in the pump resulting in this noise. I will check for a worn diverter valve, thank you for the idea. Do you have an...
It is the pump making the vibration/noise
Thank you for the response... The noise is definitely from the Smog Pump area, and it is not a squeaking or purring noise typical of a normal pump if new. The tensioner was just replaced last week, the alternator is quiet, and the AC Compressor is not...
1985 C4 (110,000 easy miles) - Smog Pump makes rattling/vibration noise at idle, and when RPM's are dropping down to an idle. Seems fine while driving. When the A/C is on, it seems louder/worse at idle (or dropping to an idle). I thought it was an internal vibration in the Smog Pump, or bad...
Fuel Pump Relay bad will create random hard starts
vetteoz & boomdriver,
BINGO!! ECM signal is there, but the coil side of relay itself was open. Time for a new relay. Thank you for the assistance! Having the wiring diagram says it all... tigerdan
This problem only occurs when I first get into the car. If it does start, the check engine light is lit. If I turn off the key and listen for the fuel pump to turn off (just a few seconds), the car will start just fine. So,... Why does the fuel pump not turn on the first time I try to start it...
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