Intermitent engine shut down

Submitted: Tuesday, Feb 09, 2010 at 22:04
ThreadID: 75908 Views:1657 Replies:6 FollowUps:7
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I have a 1990 Mits Pajero 3.0 V6 Auto superwagon, it has been a great car for many years, but of late the engine will just stop while driving or at idle. It has also been difficult to start. It will wind over but will not fire. Sometimes when it does start it will run very rough like it's running on 3 cylinders. It has been in and out of the mechanics for the last 2 months (more in than out). The computer, relay, coil, alternator, numerous connections on wiring harness have all been changed. Still no joy. Has anyone experienced this problem or have any ideas on the cause.
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Reply By: GlennD - Wednesday, Feb 10, 2010 at 01:27

Wednesday, Feb 10, 2010 at 01:27
Have you changed fuel and air filters
AnswerID: 403517

Reply By: Pete Jackman (SA) - Wednesday, Feb 10, 2010 at 08:31

Wednesday, Feb 10, 2010 at 08:31
We had the same problem on the same vehicle. Ours turned out to be a throttle position solenoid thingy that advances the throttle at idle and when cold.

Regards

Pete
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AnswerID: 403535

Follow Up By: MrBitchi (QLD) - Wednesday, Feb 10, 2010 at 08:40

Wednesday, Feb 10, 2010 at 08:40
Idle Stepper Motor ;-)
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FollowupID: 673028

Follow Up By: Pete Jackman (SA) - Wednesday, Feb 10, 2010 at 08:53

Wednesday, Feb 10, 2010 at 08:53
Yep, that was it.

Pete
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Follow Up By: Member - Donks1 (NSW) - Wednesday, Feb 10, 2010 at 09:51

Wednesday, Feb 10, 2010 at 09:51
Could be the Throttle Position Sensor, ( T.P.S. ) or the Idle Speed Controller. ( I.S.C. )

Steve
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FollowupID: 673038

Follow Up By: Brettie - Wednesday, Feb 10, 2010 at 15:35

Wednesday, Feb 10, 2010 at 15:35
Thanks to everyone for your advice on our problem. Our mechanic is now going to check the Idle Stepper Motor and also the Crank Sensor. Hopefully this will get us going again. Thanks again.
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FollowupID: 673136

Follow Up By: Brettie - Wednesday, Feb 24, 2010 at 15:24

Wednesday, Feb 24, 2010 at 15:24
Thanks everyone for your help. The vehicle has now been repaired and back on the road with no problems. It turns out, it was the Crank Sensor and the Idle Stepper Motor.
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FollowupID: 675480

Reply By: dbish - Wednesday, Feb 10, 2010 at 11:52

Wednesday, Feb 10, 2010 at 11:52
Hi Bretty, Next time it wont start check if there is any spark coming out of coil HT lead when cranking. The distributor has a sensor in it to fire the ignition & is also timeing signal for injectors. May be int faulty????? Daryl
AnswerID: 403574

Reply By: DesF - Wednesday, Feb 10, 2010 at 16:04

Wednesday, Feb 10, 2010 at 16:04
Hi Have a mate with much the same problem , on a manual , turned out to be the little black rectifier??? on the coil mounting plate, you can get them non genuine for about $40.00 at AutoPro, Have got one as a spare for my NF.
Cheers Des.
AnswerID: 403637

Follow Up By: dbish - Wednesday, Feb 10, 2010 at 19:27

Wednesday, Feb 10, 2010 at 19:27
I think you will find that part is the switching transistor for the ign coil. Daryl
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FollowupID: 673192

Follow Up By: DesF - Wednesday, Feb 10, 2010 at 19:51

Wednesday, Feb 10, 2010 at 19:51
I reckon thats correct, I thought they would just fail but apparantly they come and go a bit at times. no spark , then try laer and will be Ok ???
Cheers Des.
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FollowupID: 673197

Reply By: howesy - Wednesday, Feb 10, 2010 at 20:15

Wednesday, Feb 10, 2010 at 20:15
check all your earthing, undo them and retighten to ensre good contact. can cause similar dramas
AnswerID: 403671

Reply By: OzTroopy - Wednesday, Feb 24, 2010 at 15:36

Wednesday, Feb 24, 2010 at 15:36
FollowupID: 675480 Submitted: Wednesday, Feb 24, 2010 at 15:24
Brettie posted:
Thanks everyone for your help. The vehicle has now been repaired and back on the road with no problems. It turns out, it was the Crank Sensor and the Idle Stepper Motor.


Apparently a good test of the crank sensor is to pour cold water on it after the vehicle has stopped for no reason ... and then see if the vehicle starts OK.

They are a hall effect type sensor and degrade with prolonged heat exposure.

Bit late now I know ... but maybe handy to know in the future.
AnswerID: 405763

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