Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Hi, I'm Ron and I will be helping you today.Stand by for a moment while I prepare your answer.
Rich conditions include leaking injectors, bad pressure regulator, manifold vacuum line off of regulator, plugged air filter.
You should also scan the computer reading the integrator and block learn values. A bad O2 sensor biased lean will also cause it.
Your regulator is built in the the TBI unit, no vacuum line on that one.
A fuel pressure tester/leakdown tester is need to check for leaky injectors.
You can also test the O2 sensor with a scope for biased lean condition.
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Let's concentrate on the initial issue first, by repairing this, may fix your other issues.
I need the data from your scan tool readings and scope as well. Let me know if you need any wave forms to match to.
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