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I'm not intimately familiar with the TBI system either, but here are a few thoughts:
1) Did they also replace the ECM after replacing the alternator when they did that? I would assume yes, but you didn't mention it in the post. I wonder if it's possible that they were actually correct, but never replaced the ECM after they did the alternator?
2) The current shop wants to change out the EGR valve...I'd try this first before paying them to replace a part that may not be bad. Find the EGR valve and disconnect the vacuum line that feeds is. This will keep the valve closed at all times and should alleviate the problem, if it is indeed the EGR valve.
3) I'd also look at the Fuel Pressure Regulator (FPR). It almost sounds like the diaphram is bad, and it's letting lots of fuel into the manifold unchecked. Sometimes, they make an FPR rebuild kit (which consists of the diaphram and o-rings) or sometimes you have to buy the whole thing new. Check the vacuum line between the FPR and intake manifold and see if it's wet (shortly after you turn the truck off). It should NOT be wet; if it IS wet, that's likely your problem -- get an FPR rebuild kit or replace the FPR.
It sounds like the shops you've been to keep getting you to pay them to put new parts on, without any form of assurance if that actually fixes it. Whatever you do from here on out, I'd ask them how they got to that diagnosis and why they think that part is bad -- and if it doesn't work, what recourse do you have (if any).
Good luck,
Last edited by jadcock : Dec 6th, 2003 at 12:40 PM.
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