OKAY I LIED NOT SOLVED!!! Post 11 - Idle surging - 90 SHO

[TimboSHO]

I forgot to mention, that intake was completely gone through (Cleaned inside and out, all new gaskets, and crappy paint on the snakes) by me a few years ago. It sat on my blue 91 and white 89 with absolutely no issues before it came to rest on this blue 90. I really don't think the intake is the problem.

 

[rubydist]

ONE question: Can I take the same harness from a 93 MTX and swap it in one for one? Is there anything different about that harness from 90-93 MTX?

unfortunately, there are differences - it will not be as simple as putting a 93 harness in the 90.

I don't recall specifically what all is different, but I recall enough difference that you will be chasing other issues.

 

[boat]

What about just the EEC harness from the PCM to the CCRM and all the other junk in between? Any ideas of the years that are the same for a 90 that I can swap in? Are all gen 1 EEC-IV/engine harnesses the same?

unfortunately, there are differences - it will not be as simple as putting a 93 harness in the 90.

I don't recall specifically what all is different, but I recall enough difference that you will be chasing other issues.

 

[3d914]

unfortunately, there are differences - it will not be as simple as putting a 93 harness in the 90.

I don't recall specifically what all is different, but I recall enough difference that you will be chasing other issues.

boat, I did a comparison between the 90 & 93 Pavlin diagrams for the EEC (PCM) and functionally they are the same, but wiring colors do vary slightly. Here's a link to the page of manuals (on a Russian site).

Can't speak to the harness differences - although my PCM harness I used was not from a 95 and it had different wire colors, but same connectors.

Good luck.

 

[boat]

Gerard, Thank you for that. I think for now, I am going to try to find a 90 harness and use that. I'd rather not have to chase wires. I am hoping to find a harness in good shape to swap in.

boat, I did a comparison between the 90 & 93 Pavlin diagrams for the EEC (PCM) and functionally they are the same, but wiring colors do vary slightly. Here's a link to the page of manuals (on a Russian site).

Can't speak to the harness differences - although my PCM harness I used was not from a 95 and it had different wire colors, but same connectors.

Good luck.

 

[loboreno]

I don't know if you already changed the harness but there is one difference. There are 2 plugs under TB that are male and female, on a 90 and 91 they are different. Well I should say they are both female if I remember right. I had made I spliced connector,with factory plugs, so I didn't have any issues. but later on I bought another car that had same connector I made .... this one looked factory made. Mine I had soldered the wires together. Well anyways if you find out you can't plug in two under TB but everything else plugs in, you can have the plugs I have cause now I have 2 sets

 

[shotime1994]

What if you put the correct PCM in the car? A 90 didn't come with an X2J.

 

[loboreno]

I have a x2j now..... also had a los too.... didn't matter .... in either harness.