Question about 1995 Buick Riviera

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ECM SHUTS DOWN

I had a problem with the car shutting down. changed the crank sensor.
ecm was found to be faulty, so was changed. worked for a while and dies again. put old one back on it works for a while. even if you just unplug the ecm and replug it the car fires up no problem. could it be a spike that is shutting the ecm down? thanks ****

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  • Anonymous Nov 10, 2008

    i have the same problem car shuts down when i make a right hand turn had the crank sensor changed and it dident help i took the ecm down from under the dfash runs great when its on the floor then when i put it back in place it starts up doing it again thinking of chqanging the ecm bit i think its in the wireing harniss

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  • Master
  • 335 Answers

I have seen so few ECM that cause your symptoms, do you know what you are loosing when it "shuts down" spark, ignition, fuel pump 5 volt ref? If I was sorking on it Id have to check all the ECM grounds there are several, and make sure all the incoming powers are constant and keep equipment hooked up and check to see what is missing when it acts up.
Please let me know how it goes so I can recommend net next course of diagnostics follow-up at
fixincars@yahoo.com
also visit my website i creayed while I owned Ace Automotive Diagnostic facility in Lakewood WA from 92-06
http://www.aceautomotive1.com check out the FAQ and BLOG

Posted on Sep 22, 2008

  • Randy Harkins
    Randy Harkins Sep 28, 2008

    Have you fixed the car if so please share with me what fixed it if you will and if you are still having problems let me try to help

    Randy

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Engine shuts off when it comes to hot


Jay :
Hello and thank you for using JustAnswer.com
Jay :
do you have any codes stored? other than the swirl valve code?
Customer :
no other codes than 2 codes for swirl switch but this is only because i have the wrong ecm installed, the problem with engine shutting down is still presant witch leads me to believe we still have problem other than ecm
Jay :
you still have the original Ecm correct?
Jay :
How does the car run cold? Do you have a Scanner or a code reader?
Customer :
car was originally towed in with transmission problem , multiple misfires and bad oxygen sensor. customer wanted used transmission and all coils replaced along with the new oxygen sensor, customer picked up car, a few days later on the highway engine starte lossing power and stalled out. car restarted after sitting but only traveled a few miles before dstalling out again , we towed car in, started diagnostics and came up with ecm , yes we still have origial ecm
Customer :
we never had any DTC'S in memory with the getting hot and shutting condition , car runs perfect cold and yes we do have snap on and mac scanners
Jay :
Plug in the original Ecm and start the car. Monitor the Air and Fuel mixture readings and let me know what they are. Check these readings as the car warms up and let me know what they are.
Customer :
won't i need to have the original ecm flashed for the security system ?
Jay :
it should still be programed
Jay :
But you can use the ecm you have in the car
Customer :
the original ecm will not start car , will run test with new ecm
Jay :
k
Jay :
Also try this and let me know what happens when you try this. Get the car all warmed up until it stalls. Then unplug the MAF sensor and see if the car starts and idles.
Jay :
Let me know, thank Jay!
Customer :
with car running MAF @.42 / ign. advance HERE is a copy of it.
Jay :
I have seen when it comes to Nissans, that after market electrical parts never seem to work right
Jay :
I would go through the harness and do wiggle checks and ohm and voltage drove the wires.
Customer :
after we completed the work we have had to mil light on, even when the car was dying out
Jay :
Cause you have the Swirl valve code. That is why the MIL light is on right?
Customer :
yes now we have the light on for the swirl valve because we have a california emissions ecm in the car, i have to start with finding another ecm and have this one flashed again or do you think i should just install the original ecm and go from there
Jay :
I would go back to the original Ecm, unless you found something for sure wrong with it. Then check the harness.
Customer :
we removed all the after market coils and installed the originals , engine still shut down , we tested for injector pulse and still have pulse but no spark
Customer :
it shuts down at about the same time on each occurance, right now engine shuts down during third cooling fan cycle
Jay :
I wonder if the Ecm is bad? That is odd how on the 3rd cycle of the fans it shuts down.
Jay :
I am sorry I needed to step out for the day and will be out this evening. I will be around tomorrow if you would like to continue, if you would like I can opt out and another expert can assist you. Let me know, thanks Jay!
http://www.xcardiag.com/wholesale/digimaster-3-digimaster-iii-original-odometer-correction-master-supports-english-127.html

May 21, 2013 | Cars & Trucks

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