4.3 TBI problems - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 05-09-2004, 10:37 PM Thread Starter
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4.3 TBI problems

I have a 92' blazer with the 4.3. It is stock except the flowmaster muffler, k&n filter and the TBI spacer.

The spacer is whats giving me problems. After installing it it goes better in the mid range and up, but on the bottom end, especially at a stand still you can put it to the floor and it will bog like a crab.

Is this something that is common and is it just doing the same as a carb with the injectors not keeping up? I thought it was just a vac leak at first but can't find one. i even used either!!!!! Let me know if anyone on here has some ideas.

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post #2 of (permalink) Old 05-16-2004, 09:55 AM
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Re: 4.3 TBI problems

Call the manufacter of the spacer plate and get them to help. You probably paid upwards of $75.00, so get your moneys worth out of them. Wish I could help more. Goodluck
post #3 of (permalink) Old 05-30-2004, 01:30 AM
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Re: 4.3 TBI problems

How thick is the spacer that you installed? It could be causing the engine to run to lean under load or heavy acceleration. I would also check that you are getting vaccum to the MAP sensor since it works off one of the ports of the throttle body. It could be sending the wrong info to the ECM due to poor vaccum to the sensor. One other thing is to check your fuel pressure regulator on the throttle body they are known to leak and cause running issues. Keep in mind it might not be the spacer but a problem that was already there, that got heightened by the spacer. Check your fuel pressure as well.
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