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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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