Gremlins under bonnet....

MGBJM · 3rd May 2016, 20:45

Please can anyone shed any light on this? My usually reliable and unshakable diesel seems to be broken.
I started it today tonight and it had a slightly rough idle for a few seconds, then settled down. Under acceleration however it felt to be loosing power, and not revving smoothly. Upon stopping at a junction it stalled- but started in the button before displaying same symptoms minus the stall. I parked it in the supermarket and the rev needle was showing small fluctuations at idle. So I did what anyone would and went shopping.
When I started it again it displayed similar symptoms so I took it for a run to see if it might be temp related. At the end of the run up to motorway speeds the car seemed better, but the engine did almost stall again coming to a halt. 30 mins later I got in the car again to bring it home and it was fine. I'll check the plenum in the morning but has anyone any ideas... If it's a diesel injector fault it could be depressing!

Greeners · 3rd May 2016, 20:52

start with basics, check the ECU for signs of having been for a swim

You could try unplugging the MAF to see if that helps

I'm not that good with distances, but I'm guessing Bigruss and his T4 would be the next port of call

first-things-first · 4th May 2016, 13:00

Wonder if this could be as simple as a bad batch of fuel? Try filling up at another station and see if that helps?

MGBJM · 4th May 2016, 17:29

Well, have checked the very basics- plenum chamber dry, oil and coolant present....
Will take it out and see if fault persists. Bad diesel could be an interesting theory, but the last tank was a full one from the warning light of BP (normal stuff) and it took a quarter of it without complaint.
Will put a splash of ultimate in and see what happens....

MGBJM · 6th May 2016, 11:20

How odd! Following a splash of diesel, a prod at the ecu and a thrash the car is now cured... Maybe it was a fuel contamination problem or maybe there's a loose connection on the ecu?

Could be the car just fixed itself. It shall call it Christine. Now I just have to go out and see that strange old dude who sold me the car, and get then even with that Buddy Repperton..... :eek

3rd May 2016, 20:45	#1
MGBJM Loves to post MG ZT+ CDTi Join Date: Sep 2013 Location: Huddersfield Posts: 328 Thanks: 118 Thanked 105 Times in 66 Posts	Gremlins under bonnet.... Please can anyone shed any light on this? My usually reliable and unshakable diesel seems to be broken. I started it today tonight and it had a slightly rough idle for a few seconds, then settled down. Under acceleration however it felt to be loosing power, and not revving smoothly. Upon stopping at a junction it stalled- but started in the button before displaying same symptoms minus the stall. I parked it in the supermarket and the rev needle was showing small fluctuations at idle. So I did what anyone would and went shopping. When I started it again it displayed similar symptoms so I took it for a run to see if it might be temp related. At the end of the run up to motorway speeds the car seemed better, but the engine did almost stall again coming to a halt. 30 mins later I got in the car again to bring it home and it was fine. I'll check the plenum in the morning but has anyone any ideas... If it's a diesel injector fault it could be depressing! __________________ You never miss it 'till its gone

3rd May 2016, 20:52	#2
Greeners Moderator MG-ZTT Join Date: Mar 2007 Location: Ware, Herts Posts: 19,798 Thanks: 161 Thanked 1,249 Times in 1,036 Posts	start with basics, check the ECU for signs of having been for a swim You could try unplugging the MAF to see if that helps I'm not that good with distances, but I'm guessing Bigruss and his T4 would be the next port of call __________________ *David* Impecunity is the mother of ingenuity Useful how to's for common problems Car Of The Month Jan 2014 [SatNav Power Down] [Coolant Level] [SatNav Repair] [Diesel Non Starting] [Paint Codes] [Rear Light Seals] [Reversing Light Switch] [Bleeding Brakes][Sunroof Drain] [Early ZT's][Instrument Pack Diagnostics][ATC Diagnostics]

4th May 2016, 17:29	#4
MGBJM Loves to post MG ZT+ CDTi Join Date: Sep 2013 Location: Huddersfield Posts: 328 Thanks: 118 Thanked 105 Times in 66 Posts	Well, have checked the very basics- plenum chamber dry, oil and coolant present.... Will take it out and see if fault persists. Bad diesel could be an interesting theory, but the last tank was a full one from the warning light of BP (normal stuff) and it took a quarter of it without complaint. Will put a splash of ultimate in and see what happens.... __________________ You never miss it 'till its gone

6th May 2016, 11:20	#5
MGBJM Loves to post MG ZT+ CDTi Join Date: Sep 2013 Location: Huddersfield Posts: 328 Thanks: 118 Thanked 105 Times in 66 Posts	How odd! Following a splash of diesel, a prod at the ecu and a thrash the car is now cured... Maybe it was a fuel contamination problem or maybe there's a loose connection on the ecu? Could be the car just fixed itself. It shall call it Christine. Now I just have to go out and see that strange old dude who sold me the car, and get then even with that Buddy Repperton..... :eek __________________ You never miss it 'till its gone

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4th May 2016, 13:00	#3
first-things-first Posted a thing or two MG ZT Join Date: Jul 2014 Location: Hornchurch Posts: 1,255 Thanks: 176 Thanked 352 Times in 272 Posts	Wonder if this could be as simple as a bad batch of fuel? Try filling up at another station and see if that helps?