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Old 03-04-2011, 01:16 PM   #10
FritzA
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Join Date: Jul 2009
Location: Denver Burbs, CO
Posts: 115
Re: 87 Chevy 350 TBI low Idle issue

Thank you for the very thorough analysis. You are giving everyone who reads this a lot of good information on how to troubleshoot.

I was going to suggest the fuel pressure test might indicate a worn out fuel pump since they were never that great anyway but since it happens on both tanks I doubt that is a problem.

It did make me think of one possible item that might effect fuel pressure at idle and that is fuel lines. As I recall the first year or 2 of tbi trucks had some sections of fuel line that were rubber from the tank to the filter? (I may be wrong on this) There is a chance this line has gotten a little soft and is not holding the pressure as it should.

There is also the pressure regulator. Do those springs ever wear out and lose a little strength? The springs are under $15 as I recall. Maybe just cleaning and reinstalling will help the regulator.

I think the fuel pressure test will be very valuable.

Keep us informed.
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