Re: Off topic, Chevy truck help!

Posted by Lil-Farmer on January 20, 2005 at 14:33:47 from (205.246.142.111):

In Reply to: Off topic, Chevy truck help! posted by knauffj on January 20, 2005 at 12:21:32:

Put a vacuum gauge on the power brake port. When cranking or at idle (I know, it is hard to make it idle) you should have a smooth vacuum signal, 10, 11 inches at crank and 18, 19 at idle.

We had a 94 that sat at a dealership for over a month while they fiddled with it; ended up with them telling us the motor was junk and for 3500.00 they could install a new one.

Any way to make along story short, the engine had a broken intake valve spring allowing compression pressure into the manifold. Found the vacuum problem with the gauge, it was all over the place.

The TBI really runs off of two main signals, vacuum signal and throttle position sensor. Low vacuum tells the ecm that the engine is under load and signals it to put in mucho fuel.

The injectors quitting, I would agree with others; oil pressure switch or pump relay.

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