1G HELP me bring this DSM back from the grave !!!

[gunner4usa]

Finally, my brother-in-law gave the 90 GSX up after 5 years of it sitting. His father used to go and start it once a week, but that was at least three years ago. I gathered up some common tools and a jump box and headed down to see what the car would even do. I put some mystery oil in the cylinders and let it sit for a week. When I went back, turned the motor over by hand with no problems. Next, I went through and changed fluids and just about anything else you could think of before starting a car that has been sitting for a long time. Hooked jump box up and it cranked. Realized it was not getting fuel or spark. Replaced the MPI with a replacement and another ECU for the car. It still cranked but no spark or fuel. Check engine light cycled when the ignition was turned on, like it is supposed to. I got a copy of DSMLink and went down this weekend to see if I could figure out what was going on by using my laptop. When I hooked the jump box up this time, the check engine light did not cycle and the car would not crank at all. The other warning lights come on in the dash like the coolant and brake light. I tried combinations of the new and old ECUs and MPI relays. Please, if anybody has any ideas on this, please let me know. I really do not want to rent a trailer to get it up to my house without knowing if it will be something simple, $$$ or not to get it going.

 

[911gdsmboostin]

Also I can try to find those wiring diagrams I found that showed me that when I get home I'll look for them an send you the link

Also the fwd awd auto or manual aspect makes no differance at all the only differance that matters in ecu's is 89-90 and 91-94 cannot be interchanged awd fwd auto and manual can be but the years gotta be 89-90 for 89-90 and 91-94 fr 91-94 same goes for 2g that came straight form tom at ecm

Hello again just got home and checked and I was correct the swap is a pin 6&14 swap those pins are idle position switch and air flow sensor (maf) so I would believe this could course some major issues also reading other things u would need to swap on a 90 to use a 91-94 ecu such as coil pack transistor, cas and some other things so I can imagine this could possibly be your issue or at least part of it
Here's a link you can see what they are and being a mechanic I'm very confident this would cause issues

http://www.vfaq.com/mods/ecu-harness-1G.html

You should read about the pin swap there is tons on info on it and about it and again of you need an ecu I have a 91-94 ecu that was converted to a 90 from my understanding these ecus were better to use relative to the 90's ecu's could possibly meet up sometime if you like but also just trying to help I remember reading this post when it first started thinking you could have a lot of issues I checked back on the last page reading about the mpi thing I remember when I roster one of my old ECU's (caps leaked ) it did the same thing your discribeing it would run and shut off but you seem to have other things going on as well I never checked the codes I pulled the ecu opened it up and saw the damage and replaced it... Hope this is helpful and good luck

 

[gunner4usa]

Hello again just got home and checked and I was correct the swap is a pin 6&14 swap those pins are idle position switch and air flow sensor (maf) so I would believe this could course some major issues also reading other things u would need to swap on a 90 to use a 91-94 ecu such as coil pack transistor, cas and some other things so I can imagine this could possibly be your issue or at least part of it
Here's a link you can see what they are and being a mechanic I'm very confident this would cause issues

http://www.vfaq.com/mods/ecu-harness-1G.html

You should read about the pin swap there is tons on info on it and about it and again of you need an ecu I have a 91-94 ecu that was converted to a 90 from my understanding these ecus were better to use relative to the 90's ecu's could possibly meet up sometime if you like but also just trying to help I remember reading this post when it first started thinking you could have a lot of issues I checked back on the last page reading about the mpi thing I remember when I roster one of my old ECU's (caps leaked ) it did the same thing your discribeing it would run and shut off but you seem to have other things going on as well I never checked the codes I pulled the ecu opened it up and saw the damage and replaced it... Hope this is helpful and good luck

911gdsmboostin,

I had it running off of a 91-94 ECU and I had switched the 6 & 14. A good friend sent me the ECU out of his 90 GSX AWD Manual, which is my setup also. I switched the 6 & 14 back and tried his ECU. When it wouldn't start, I switched back to the 91-94 and switched wires again. With my car acting up, I don't want to take the chance of screwing his ECU up. I am going to mess with it some tomorrow. Have the battery fully charged, my spare CAS just in case and I am ready to get yet another set of plugs if the month old ones in there now are fouled out because of seafoam and lucas fuel treatment. I will let everybody know how it goes.

Just a head up man I did a good bit of research when I bought an ecu with link for my car turned out to be a 91 converted for a 90 so the pins were switched being mine is a 91 I would have had to switch back so in just getting new ecu... A lot of people at the only difference is the tach but after reading the wire dura grams a good bit what also is their in those pins is the mafs if those arnt switched I'm sure it could cause mafs issues not staying this being the problem but I know the tach isn't the onlydifference if you want I can sell you this ecu being I have no use for it a soon as it gets back to me because it's being sent out to tom at ECM running to have the ECM link chip remove and installed in a different ecu. This one I have is a 91-94 ecu with pins 6-14 switched internally by a professional who was chip driver at dsm chip they were good but not sure if they still do business or not but either way it's a EPROM ecu that works it wot have the EPROM chip but you won't need it for it to work the car will run and drive fine with out it.. Or u can have it for a spare or if you ever wanna go dsm link u have a good ecu to use, I can send pics of the internal mod if you like so you can see how it was done ha a special chip installed for the tach and wires soldered for pins 6-14 which like I said I read and they stated were mas and signal wires good luck either way

911gdsmboostin,

Yeah, send me some pics of the internals. I believe I may of seen one with this done before. How much are you looking to get for it?

 

[gunner4usa]

UPDATE:

I am assuming that all of the sea-foam and Lucas fuel treatment I had to use fouled the plugs a bit. Cylinders loaded with fuel and one of the plugs finally ignited. I checked compression and from cylinder 1-4 they are 124, 130, 126 and 130. For the turbo model, minimum compression is 113 and maximum allowable between any two cylinders is 16. Thank God I didn't damage anything. The pictures below are the cam gears when the crank is set at the appropriate position. I have to pull it apart and realign all components. Are there any tricks to this without pulling the whole side of the motor apart?

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[911gdsmboostin]

I would try going around a few time to to really make sure and try to snake down what couse it to move if it did

 

[gunner4usa]

Timing all back straight. Now, When I start to let the clutch out it starts to move forward and then stops. Almost like calipers are locked, but they aren't. It will drift backwards, but I can't even budge it in neutral trying to push forward.

 

[gunner4usa]

I’ve been out of country for like the last 18 months. Got it running and driving close to good again.

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[Dsm panda]

So just wondering why wouldnt it move forward at all?

 

[gunner4usa]

So just wondering why wouldnt it move forward at all?

When somebody removed the AC, they didn’t replace the bracket with washers or spacers. One bearing carrier bolt snapped off and the other backed out and fell somewhere on some road. That allowed the intermediate shaft to drop out of the transfer case. All fixed now