Question about 1995 Buick Riviera

1 Answer


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 ****

Posted by on

  • 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


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • 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
also visit my website i creayed while I owned Ace Automotive Diagnostic facility in Lakewood WA from 92-06 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



1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

I bought the crank sensor from the dealers. of-course it is a new type but they said it will work. will it help to change the cam sensor as well?

Crank and cam sensors are responsible for feeding the ecm a signal so it fires the plugs. If after changing both you still get no spark then the issue has to lie with either the ignition coil or the ECM. And if you have a gm car the issue could be with the VAT (anti theft module) that is problematic in those cars. (car will start and then shut down).

Feb 08, 2017 | Cars & Trucks

1 Answer

If the cam shaft sender goes out will it shut the car down even if no sputtering or no warning and it's running,just cut off like you turned the key off

it will just shut off the engine because the ECM will have no idea of the position of the cam in relation to the piston
The ECM needs to know the exact position of the crank and cam shafts to determine the ignition timing so if one or both go out then the engine stops
If course if the timing belt breaks the same result happens as the cam shaft sensor stops sending a signal to the ECM so the ECM shuts the engine down

Feb 24, 2016 | Cars & Trucks

1 Answer

GM said the sensor by the oil filter on a 1997 achevia is a crank sensor you its a oil presser sw. and it is linked to Ign sw. how , will the eng die in a second if the wires are broken or the sensor

the oil pressure sensor tells the ECM when there is insufficient oil pressure to safely run the engine
when you start an engine there is oil covering the pump inlet and the pressure buils up
if there is insufficient oil to maintain pressure ,or the pump cannot maintain a low preset pressure , the ecm will shut the engine down to protect it
like wise if the wiring is loose /faulty the signal from the sensor is interrupted and that tells the ecm to shut the engine down
again if the sensor is faulty , the ecm will shut the engine down
how to fix :-
install a mechanical oil gauge in the system and check for oil pressure achieved
replace the sensor switch with a known good one
run the fault codes

Aug 31, 2015 | Cars & Trucks

1 Answer

I have 2002 Ford ranger 2.3l n I broke two teeth on the harmonic balancer that the sensor reads I assume will this stop the engine from starting?

most definitely
there has to be set pulses for the position sensor to work
normally both the crank position sensor and the cam shaft position sensor work together and send signals to the ECM and if one signal is not in sync with the other , the ecm thinks something is wrong and shuts down the engine.

May 07, 2015 | 2002 Ford Ranger

1 Answer

How do i fix a code po688? 2004 pacifica, no crank, no start, dash lights are on with key on the on position

Weak battery- Low voltage while cranking
- Faulty Engine Control Module (ECM) relay
- Blown ECM fuse
- Faulty ECM
- ECM harness is open or shorted
- ECM circuit poor electrical connection

Jan 20, 2015 | 2004 Chrysler Pacifica

1 Answer

Emergency fuel shut off

There is no emergency shutoff for the fuel pump. It is controlled from the ECM. There is a fuel pump relay in the relay/fuse box under the hood. But if you have power to the pump, it is probably ok. Having had a 1999 Dakota I had a situation where I was having intermittent shutdowns when driving that became more and more frequent. Sometimes I could restart immediately, other times I had to wait from 10-30 minutes before I could get a restart. I assumed a faulty fuel pump and replaced it only to find that it did not solve my problem. I researched the issue and found that the Dakotas and Durangos have a tendency to have faulty crankshaft position sensors. It will mimic a fuel pump issue since when the ECM loses sensor input, it shuts off the fuel pump. Test the pump this way - in a quiet setting, turn the key to the ON position, but do not crank the engine. With the drivers door open listen for a 2-3 second humming sound from the rear of the truck. This is the fuel pump priming the system to get fuel rail pressure. What then happens is once you start cranking and the engine fires, the ECM turns the pump on full-time. If the crank sensor is bad, the ECM cannot see that the engine is turning over and does not generate spark or fuel injector pulses, so even the fuel pump prime works, if it worked won't start the engine. At least if you hear the prime, you'll know the pump is functioning.

Sep 08, 2014 | 1999 Dodge Dakota

1 Answer

Where is the ECM located?

ECM is probably OK. On this year its one of 3 things. First its the ignition coil causing the problem. This is the most likely cause. Second would be the fuel pump is going bad and partially locked up. The third reason is the crank sensor is going bad. Jeep ECMs don't usually act like this, they just stop working and don't act up intermittently. Not saying it couldn't be faulty, just unlikely.

Jun 29, 2014 | 2000 Jeep Cherokee

1 Answer

How to test a crank sensor 99 dodge durango SLT 5.2 L

there is really no way to test crank sensor unless it shuts down and u have a computer that can check it. I found out after changing the crank sensor that was not my problem the ecm is overheating kicking the auto shut off and after it cools a few min it will crank over this is the 3rd ecm I have tried from orielys auto it cost me 150 bucks each time to program it im over it I am going to try to install cooling fan and see if that will help my problem will let you know if it works or not on later post

Jun 28, 2014 | 1999 Dodge Durango

1 Answer

If a trouble code on a 2000 vw shows speed sensor and the test comes out good what is the problem

engine speed sensor could be faulty.engine speed sensor provides the ECM with a crankshaft position signal.the ECM uses the signal to determine a crankshaft reference point top dead center and calculate engine speed. engine speed sensor like the crankshaft position sensor.if sensor faulty fuel system wont work. a bad engine coolant temperature sensor will cause engine shut off when hot.

Jul 28, 2013 | Cars & Trucks

2 Answers

Engine shuts off when it comes to hot

Jay :
Hello and thank you for using
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 :
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!

May 21, 2013 | Cars & Trucks

Not finding what you are looking for?
1995 Buick Riviera Logo

248 people viewed this question

Ask a Question

Usually answered in minutes!

Top Buick Experts


Level 3 Expert

71338 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22059 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

7018 Answers

Are you a Buick Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides