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Print in friendly format Send this term to a friend  4L80E
Automatic Transmission - 4 Speed

1st Gear: 2.43
2nd Gear: 1.49
3rd Gear: 1.00
4th Gear: 0.75

Reverse: 2.07

- Used in production GM models...
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Re: SYS light- what is it

Subject: Re: SYS light- what is it
by TommyT-Bone on 2015/5/8 4:05:03

Quote:

Woodstock wrote:
It's most likely an easy fix for you and your L98.
99% your ECM is toast. Since your 90 and 91 use the same ECM, just switch it over and most likely the code is gone and culprit found.


Here's the problem. The 91 is a Crate 383 stroker with a ProCharger supercharger and a MSD ignition box. Still a plug and play? Just change the card with it? I'm suddenly suspect of the battery by the way. I'm gonna have to have it tested even though it's supposed to be brand new, it isn't acting right. Also I charged the car up to capacity the other day. It was dead within a week. The shop looked for possible drains/breaks and checked the grounds. No issues found and it maintained a charge at the shop. I'm willing to look for and pick up an ECM and keep it as a spare if it's not the culprit. Time will tell and I'll post any conclusions.
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