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YOUR RESEARCHRough running and stalling. ABS/PSM lights. NOT MAF?
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Run rougher and i decided
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Performed · outcome unconfirmed · Original poster
I got to a fuel station to fill it with more super unleaded but after a restart it ran rougher and I decided to abort the MOT and drive back home.
Rough running and stalling. ABS/PSM lights. NOT MAF?
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Leading evidence: 'Run rougher and i decided' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check any codes' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Use some carb/egr cleaner through the throttle body
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Performed · outcome unconfirmed · Original poster
I also used some carb/EGR cleaner through the throttle body but bypassed the MAF as I didn't want to gum it up.
Rough running and stalling. ABS/PSM lights. NOT MAF?
Check any codes
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Suggestion
Is your CEL on and have you checked for any codes?
Rough running and stalling. ABS/PSM lights. NOT MAF?
Run issue
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Suggestion · Original poster
I remember I had an old MAF so I fitted that and I still have the same running issue.
Rough running and stalling. ABS/PSM lights. NOT MAF?
Run just as rough
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Suggestion · Original poster
I pulled the plug on the MAF to put it to default setting's and it ran just as rough??
Rough running and stalling. ABS/PSM lights. NOT MAF?
Run nicer straight away
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Suggestion · Original poster
I removed the plug and sprayed both that and the throttle body with IPA then both with WD-40, plugged back up and it seemed to be running nicer straight away.
Rough running and stalling. ABS/PSM lights. NOT MAF?
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I thought I would keep this separate from my MOT failure thread as it is a new thing that's happening and is now stopping me from going back to get a re-test.
The issue first started when I drove it back from the MOT retest on Friday, (failed on the horn again) the car was revving by itself then had no power to pull out of a junction and also stalled. I had to restart and it then ran rough. The car was very hot from the emission test they had done but it got me home. I left it running on the drive where the revs were fluctuating.
Today I had booked the car back in for its second retest and from cold it started fine and revved out okay on the drive, as soon as I got onto the main road it felt like it had no power again. ABS and PSM light came on the dash a usual indicator of the MAF causing an issue.
I got to a fuel station to fill it with more super unleaded but after a restart it ran rougher and I decided to abort the MOT and drive back home. I pulled the plug on the MAF to put it to default setting's and it ran just as rough??
Previous to this it had failed on emissions so I had put a bottle of Cataclean in the tank and ran it until all that fuel had gone. I also used some carb/EGR cleaner through the throttle body but bypassed the MAF as I didn't want to gum it up. It drove fine to its first retest, since then it has all gone wrong.
When I got it home today I tried to rev it and it won't go above 1500 revs and will sometimes stall. I remember I had an old MAF so I fitted that and I still have the same running issue.
Now I am scratching my head?
Have I got some bad fuel? I have V-power in the tank?
Is the MAF contaminated? I have swapped for another?
Can another sensor cause ABS/PSM lights? cam or crank sensor?
I fitted new spark plugs recently, could I have a failed coil pack?
Throttle Position Sensor issue?
I'm starting to get a little annoyed at this now but I'll update with some more info once I have my laptop plugged in to it a little later.
Just got back to the car, got 9 codes.
I'll post up later but a few about throttle - position, plate, potentiometer, idle control at stop and adjuster.
Also MAF one but I had unplugged that so will get an error..
I just wiggled the throttle plug into the throttle body and revs went up and held at 1800 ish, switched off and on again and it went to a normal idle.
Gona clear these codes now and see where we are at.
Finally got to the bottom of this. The wiggling of the throttle plug and the throttle codes gave me a clue that is where I should be concentrating.
I removed the plug and sprayed both that and the throttle body with IPA then both with WD-40, plugged back up and it seemed to be running nicer straight away.
Made the call to the MOT station asking if I could come for another retest, eh voila, it made it there running perfectly.
It was just a coincidence that it happened as I was doing my MOT return journey and nothing to do with the emissions as I first thought.
