[fast4cylNJ]

Okay here goes. Yes I searched. I have a 1988 Saleen convertible that was originally an automatic. I swapped it over to a 5 speed using a brand new T5Z. I used an LMR 5 speed transmission harness and hooked up the clutch safety switch and NSS as required. I ran it on the DE (auto-speed density ECU) for over 1k miles with the only issue being a little of the idle irregularities associated with a swap such as this and a code 67. I recently decided to convert the car to mass air using a 1989 5 speed engine harness and matching o2 sensor harness. I then installed an A9L ECU so everything would match. Upon initial start up the car ran like crap. It sounded like it had a big cam in it and blew black smoke out of the exhaust. Upon opening the ECU, after not being able to run codes and I found trace 46 burnt I didn't open the case prior to initial start up so I don't know if the trace was fried already or not. I got my hands on another A9L and inspected trace 46 and found it to be intact. I started the car again and it still ran like crap. Opened the ECU and found trace 46 burnt in this second computer after I confirmed it was good. WTF?? I repaired the trace by soldering in a thin wire and tried again. The car still ran crappy and I narrowed the poor running down to a defective MAF sensor. Ran the codes and I'm still getting the same code 67 that I was getting with the automatic computer even with all of the proper 5 speed wiring in the car. I've tested pin 30 while cranking under all condition (clutch in/ out etc.) and no voltage shows on my DVOM. So far I have 2 questions. Why did the trace fry with the correct wiring in the car? and Why am I still getting code 67?

Thanks in advance for the responses.

Tommy

 

[Primedlx]

I am having the same exact issue as you. I purchased an O2 harness for a 5 speed from LMR and made sure the loop is in the correct spot, and I burnt the #46 pin and cannot figure out why. There is no voltage coming from pin #30 cranking with clutch down or up, key in run position and key in start position. I am curious to see any thoughts and suggestions people have, and maybe something to test or try.

 

[rob]

I've seen at least 3 or 4 different harnesses. Search here, but there is a way to test to figure out where your pins need to be on your o2 harness without having to guess if you have the right one or not.

 

[rob]

Read this and it may help.

http://forums.corral.net/forums/gen...manual-auto-differences-year-differences.html

 

[fast4cylNJ]

I've read all of those posts before. My main issue is that the main ecu harness and o2 sensor harness are out of an 89 5 speed car going into an 88. According to all the posts i've read this is correct and should not have fried the computer. I'm going to pull the o2 harness tomorrow to quadruple check everything for posterity.

 

[StrokedFox]

Look for a shirt in the harness. When I fried minew, I had a short in the O2 harness allowing voltage onto the 46 pin.

Joe

 

[fast4cylNJ]

Well as it turns out the o2 harness wasn't from an 89 as the Ebay seller said. Rechecked the pinout and the loop was in the wrong place. it went from pin 1 top row of the 02 side of the plug to pin 2 bottom row of the 02 side of the plug. Code 67 is gone. I looked at that thing 10 times and it didn't register in my brain. I guess sometimes you can't see the forest past the trees... Now I have to troubleshoot codes 33 and 91 that are showing in continuous memory and during the KOER tests.

 

[Blown88GT]

Code 67 (KOEO, CM)- Neutral safety circuit failure.
Code 67 (KOER)- A/C circuit was on during KOER Self-Test.
Code 33 (KOER, CM)- EGR valve opening not detected.
Code 91 (KOER) - HEGO sensor circuit indicates system lean (left side).
Code 91 (CM) - No HEGO switching detected always lean (left side).