1990 laser rs turbo problems

[Hagenair]

I have a 90 laser turbo that I am having problems figuring out a couple of things. 1) The injectors are not recieving a signal and i'm not sure where they get the signal for firing the injectors. 2) I am not getting a very strong spark its very hard to see. 3) Only 1 side of the MPI relay seems to be working i know that this get a signal from the ECM (i think), the fuel pump turns on but the injectors and spark are not working. I took ECM out of the car and took it apart the inside is clean and free from burnt section and i don't smell any thing. These are the last few things i need to fix before I get the car running. If anyone could help me out on this i would greatly appreciate it.

Thanks
Dan

 

[awdrst]

To me it sounds like it is a ecu problem. I would see if a local guy has one you can borrow to test. Also make sure all your fuses are ok including the ones by the battery.

 

[fulanititoo8198]

You could also check your cam and crank angle sensors. You can find the insturctions on how to check them on a repair manual but if you need it just let me know.

 

[Hagenair]

Ok so far i went through and did alot of wire testing and found that i was not getting power to ECU because of a clipped wire. I fixed the wire but she still would not start. I started checking the MPI relay and found that only one side was closing and if i close the other side i could get the injectors and spark to fire. Now i'm to the point that it is either the ECU or a bad MPI relay with both of the cotacts closed i get power to Pins 102 and 107. I have 12 v at pin 103 and 12 v at 110 when key is turned on. I took MPI out and did a continuity test across both coils only to find there was continuity on one side but not the other this make me think that the one coil has a broken wire on it maybe in the coil. If anyone knows how to test this Please let me know i am going to take a run to the junkyard in the morning when they open to see if i can find a good MPI relay and i am going to take my DVOM with me so i don't have to waste alot of time at the yard.

Thanks
Dan

 

[Hagenair]

Ok i took an ecu out of a friends 90 laser rs and and still only one side of the MPI relay closes so no i am stumped big time. I think it has to be something simple just not sure where to look next. I can ground pin 7 on MPI relay and close the other side. the side that runs the fuel pump works fine. I think it may be a grounding issue. Where does pin 7 get its ground from. I know the ECU isn't the problem because the i have in now is out of a running car. Any help would be great.

 

[Hagenair]

I pulled ECU out and I think I found the problem Now i just need to find out if I can just replace the caps or not and it this board is repairable or if i hafe to flip $300 out fo a rebuilt ECU.

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[Mike Marnik]

PM Steve on here he is the ecu guy around here he will be able to tell you.