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Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by ALLDATAdiy.com users over the course of many years.
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  Jim Grant's Tech Tips

90 Chevy Beretta, Stalling
Q:
I have a '90 Beretta V6 MFI that is stalling while driving down the road or while going uphill. I can duplicate the problem if I sit in park and hold the accelerator at 3000 RPM; the car will eventually die. I checked the fuel pressure and it was reading to spec. I replaced the fuel filter and checked for codes, but there weren't any. Once the car dies I am unable to restart it for quite some time, however if I lightly tap on any point of the throttle body I am able to start the car with no problem. I'm terribly confused because if there was a problem, wouldn't I get a code? Please help....Patrick

A: A vehicle of this age can be having a TDT (Total Driveability Tantrum) and still not turn on a Check Engine Light or set a code computer. What's intriguing is the manner that you can duplicate problem. Was the fuel pressure being monitored while the problem was occurring? If the fuel pressure is good and there is good ignition spark, I can't help but wonder if there is a problem with the vehicle's converter or if there is a restriction in the exhaust. I have seen some strange driveability problems with similarities to yours caused by failing catalytic converters. As for the engine starting after tapping on the throttle body, that must be one special wrench you have!

 
     
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