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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