Diagnosing the pcm
#1
Diagnosing the pcm
My 94 cranks but doesn,t start.I can hear pump when i turn key & there is fuel reaching the scrader valve connection.I also sprayed starting fluid into the throttle bores& it still didn,t start!.My ? is how to determine that the pcm is bad?What about plugging in another computer?Btw i do have spark.Any ideas are appreciated.
#3
Maybe its the opti or coil? Maybe u have a broken rotor inside of the opti or a bad ICM, Did the car just stop running or was there any stumble or missfire prior to the no start condition? How is the spark? Is it random or is it steady while cranking? Need more info.
Last edited by mightymouse383; 01-13-2010 at 08:23 AM.
#6
Maybe its the opti or coil? Maybe u have a broken rotor inside of the opti or a bad ICM, Did the car just stop running or was there any stumble or missfire prior to the no start condition? How is the spark? Is it random or is it steady while cranking? Need more info.
#7
You can go to shoebox's web page it has a large amount of troubleshooting proceedures and tech info. http://shbox.com/page/index.html
I think you can take the ICM of off the engine and take it to your local auto parts store and they should be able to test it, If u have i multimeter u might be able to test it.....I think shoebox has some instructions on how to test the opti curcuit.
I think you can take the ICM of off the engine and take it to your local auto parts store and they should be able to test it, If u have i multimeter u might be able to test it.....I think shoebox has some instructions on how to test the opti curcuit.
Last edited by mightymouse383; 01-15-2010 at 05:08 PM.
#9
The icm chk,d out ok a local auto parts store.I bought another coil& car started up right away like it hasn,t for yrs.So yes, that Msd coil i installed was garbage& might have been causing drivability issues b/f& then completely died last Oct causing a no-start cond.This was completely different from car starting then stalling for no reason.
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