Engine cutting out

Davecatt · Feb 28th, 2015, 15:22

Hope someone can help?
My 940 Wentworth has developed a problem. The revs have been going up to about 1000 -1500 but sometimes dying. This has happened when the engine is warm. Switch off and back it disappeared for a while, I was going to clean out the air idle control valve, but today I only just manged to get the old girl home. Engine cut out totally, luckily on the drive at home. If I start the engine I need to keep some power on as it will not idle, just cuts out. Lambda light briefly flicke on. So any iideas?
Thanks in advance.

TonyS9 · Mar 2nd, 2015, 19:54

Most likely an air leak on the induction side.

rogerthechorister · Mar 3rd, 2015, 18:06

Turbo or N/A?

Davecatt · Mar 3rd, 2015, 19:12

It's a turbo.
I can start it up, and it'll run for a minute or 2 then start to surge, eventually cutting out, unless I give it some gas then it'll run until I take my foot off the accelerator, then it stalls.

Dirty Rooster · Mar 3rd, 2015, 19:30

The trouble with this kind of problem is finding out which pipes might be leaking of which sensors might be faulty or even which sensors just need their contacts cleaning ... which is cheap!
Personally I'd start with the contacts on the throttle position sensor and then the IAC valve.
After those two are definitely working I'd clean out the throttle body and re set the idle screw ...
Vacc hose leaks can cause some of these issues, even the rotting hoses to the charcoal canister.
...
There's plenty to check

Davecatt · Mar 3rd, 2015, 20:16

Bugger, looks like I've got my work cut out.

rogerthechorister · Mar 3rd, 2015, 23:16

Sounds VERY like air leak to me. Check all pressure hoses first.

Davecatt · Mar 8th, 2015, 17:25

OK sort of had a bit of success, I replaced the AICV with a spare, and it's not as bad, can't detect any vacuum leaks, but there;s no clicking from the TPS when I tried to adjust it. Behaves most of the time, sometimes surges, however when I turn the ignition off then on it clears the fault for a while, I've removed fuse No1 to reset things, I'm guessing it's the TPS that needs replacing?

Dirty Rooster · Mar 8th, 2015, 18:56

The click is very faint ... I removed mine to clean the middle then carefully tested and replaced and spent some time getting it to only just click with a slack throttle cable.
If it doesn't click at all it needs seeing to.

Feb 28th, 2015, 15:22	#1
Davecatt Junior Member Last Online: Apr 17th, 2023 03:50 Join Date: Aug 2009 Location: Warrington	Engine cutting out Hope someone can help? My 940 Wentworth has developed a problem. The revs have been going up to about 1000 -1500 but sometimes dying. This has happened when the engine is warm. Switch off and back it disappeared for a while, I was going to clean out the air idle control valve, but today I only just manged to get the old girl home. Engine cut out totally, luckily on the drive at home. If I start the engine I need to keep some power on as it will not idle, just cuts out. Lambda light briefly flicke on. So any iideas? Thanks in advance.

Mar 3rd, 2015, 18:06	#3
rogerthechorister Rogerthechorister Last Online: Dec 16th, 2023 02:15 Join Date: May 2006 Location: Rochester	What sort? Turbo or N/A? __________________ B234F estate, H reg 100k miles. RIP melted B280E. 760T estate, F reg 133k miles. 940 Sport M90 estate, N reg 170k miles. 940 Sport M90 estate, N reg 100k miles, ex Lovejoy. 960 Estate, N reg, 56k miles, blown up and sold.

Mar 3rd, 2015, 19:30	#5
Dirty Rooster Premier Member Last Online: Nov 23rd, 2023 14:26 Join Date: Jun 2014 Location: Haltwhistle	The trouble with this kind of problem is finding out which pipes might be leaking of which sensors might be faulty or even which sensors just need their contacts cleaning ... which is cheap! Personally I'd start with the contacts on the throttle position sensor and then the IAC valve. After those two are definitely working I'd clean out the throttle body and re set the idle screw ... Vacc hose leaks can cause some of these issues, even the rotting hoses to the charcoal canister. ... There's plenty to check __________________ 1993 2.0 Turbo SE with 1991 2.0 Turbo engine. Older is better!

Mar 3rd, 2015, 23:16	#7
rogerthechorister Rogerthechorister Last Online: Dec 16th, 2023 02:15 Join Date: May 2006 Location: Rochester	Air leak Sounds VERY like air leak to me. Check all pressure hoses first. __________________ B234F estate, H reg 100k miles. RIP melted B280E. 760T estate, F reg 133k miles. 940 Sport M90 estate, N reg 170k miles. 940 Sport M90 estate, N reg 100k miles, ex Lovejoy. 960 Estate, N reg, 56k miles, blown up and sold.

Mar 8th, 2015, 18:56	#9
Dirty Rooster Premier Member Last Online: Nov 23rd, 2023 14:26 Join Date: Jun 2014 Location: Haltwhistle	The click is very faint ... I removed mine to clean the middle then carefully tested and replaced and spent some time getting it to only just click with a slack throttle cable. If it doesn't click at all it needs seeing to. __________________ 1993 2.0 Turbo SE with 1991 2.0 Turbo engine. Older is better!

Mar 2nd, 2015, 19:54	#2
TonyS9 Premier Member Last Online: May 19th, 2024 20:22 Join Date: Jul 2009 Location: Holywood	Most likely an air leak on the induction side.

Mar 3rd, 2015, 19:12	#4
Davecatt Junior Member Last Online: Apr 17th, 2023 03:50 Join Date: Aug 2009 Location: Warrington	It's a turbo. I can start it up, and it'll run for a minute or 2 then start to surge, eventually cutting out, unless I give it some gas then it'll run until I take my foot off the accelerator, then it stalls.

Mar 3rd, 2015, 20:16	#6
Davecatt Junior Member Last Online: Apr 17th, 2023 03:50 Join Date: Aug 2009 Location: Warrington	Bugger, looks like I've got my work cut out.

Mar 8th, 2015, 17:25	#8
Davecatt Junior Member Last Online: Apr 17th, 2023 03:50 Join Date: Aug 2009 Location: Warrington	OK sort of had a bit of success, I replaced the AICV with a spare, and it's not as bad, can't detect any vacuum leaks, but there;s no clicking from the TPS when I tried to adjust it. Behaves most of the time, sometimes surges, however when I turn the ignition off then on it clears the fault for a while, I've removed fuse No1 to reset things, I'm guessing it's the TPS that needs replacing?

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