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82 L28ET lean out top end issue


stupid_fast

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  • 1 year later...

Just wondering what ground you found bad and if indeed it is fixed?

Sorry I hadn't checked this thread in a while.

 

@mods, Necro post reason: found the real solution.

 

Turns out I was troubleshooting multiple issues with similar effects.

The issue I corrected in 2015 was a bad negative battery terminal, the bolt was tight but it was loose I could wiggle it around. 

 

I've been rebuilding the drive train on my car over the past year, just got it running and the same issue came back.

I put on a fuel injection tester & monitored the fuel pressure while driving, it was dipping to around 20psi when the issue occurred.

The cause turned out to be a clogged filter screen at the fuel pump!!

 

I feel a bit silly after all that diagnostic work to find such a simple solution, but at least I verified the rest of my setup and learned something. 

 

The motor is running very nicely now, after manually re-calibrating the AFM for proper fuel flow. 

 

Edited by stupid_fast
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