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Jim Grant's Tech Tips
'88 Pontiac 6000, No Fuel Injection
Q:
Our '88 Pontiac 6000
just stopped dead three weeks ago, the problem seems to be it is not injecting
fuel. I have replaced the ECM, MAP sensor, fuel injector,(it is a TBI
model), checked the TPS and O2 sensor voltage and I've jiggled wires all
over the car to see if it was shorting, no luck. Now I'm about to go nuts!!!.
The only thing left to replace is the ignition module, but we have spark.
If I pour gas down the bore it fires up straight away! What could it be
?
A:
If the engine starts
when you add fuel then you have to ask why no fuel? Is there good fuel
pressure? The fuel pressure on your vehicle's injection system has to
be in the area of 12 PSI. If fuel pressure is correct then you have to
check to see if the fuel injector is being triggered by the computer.
If the computer is not triggering the injector you have to find out if
it is receiving a signal from the ignition module. On your vehicle you
can have spark with no signal to the computer to operate the injector.
Without the right tools and information, diagnosing this problem is a
hit or miss event. By the sounds your check book has taken a few direct
hits.
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