Lumpy 480 turbo

pettett4 · Dec 17th, 2009, 20:40

Help! last Saturday I drove 35 mile to another town and parked in a car park,no problem, But, when I came back to the car, it started fine but, as I went to pull away, the car started running as though it was missing on a cylinder ,the further I tried to drive the more erratic it became until it would not pull at all.
After looking under the bonnet to see if there was anything obvious,I called the good old AA who also could not identify a problem and proceeded to take me and the car back home,
I have checked the obvius like plugs, leads and distributor cap and petrol is getting through and the idle valve is working. Any input as to what to check next will be much appreciated.
The engine turns ok and sounds as though it wants to run but will just not Idle.

Baffler · Dec 18th, 2009, 02:02

I would suspect the flywheel/crankshaft position sensor, located on top of the gearbox bell housing, may be faulty or shifted its position...

pettett4 · Dec 19th, 2009, 18:12

Thanks for that, tested and seems ok, getting a reading of 220 ohms across terminals.

B20F · Dec 19th, 2009, 19:52

Did you clean the tip of the cranks.sensor? Best to remove said sensor and clean the tip with contactcleaner and a toothbrush. They can get dirty and that causes irratic behaviour.
Another thing I would advise before doing anything else is to replace the rotor, dizzy cap, leads and plugs if not done recently. Those engines are very picky when it comes to ignition parts. Best is to use NGK plugs, bpr8es for the turbo iirc.

pettett4 · Dec 27th, 2009, 10:23

Hi again, thanks for the info both of you, I removed the flywheel senser ( swear words realy help in this situation !!) and although it looked ok I cleaned and replaced it, and the engine fired up and ticks over just fine now.

I just cannot believe how such a small thing can make what seems a major problem.

Thanks again chaps for the guidance.

Mike

Happy New Year.

heyskull · Dec 27th, 2009, 11:25

That one little thing makes the whole engine work.
Just replaced mine and then found out it was the ignition amp at fault!
£35 wasted.
£5 for another ignition amp at the scrappys lol

SC

Dec 17th, 2009, 20:40	#1
pettett4 New Member Last Online: Jul 2nd, 2013 12:00 Join Date: Jun 2006 Location: Northampton	Lumpy 480 turbo Help! last Saturday I drove 35 mile to another town and parked in a car park,no problem, But, when I came back to the car, it started fine but, as I went to pull away, the car started running as though it was missing on a cylinder ,the further I tried to drive the more erratic it became until it would not pull at all. After looking under the bonnet to see if there was anything obvious,I called the good old AA who also could not identify a problem and proceeded to take me and the car back home, I have checked the obvius like plugs, leads and distributor cap and petrol is getting through and the idle valve is working. Any input as to what to check next will be much appreciated. The engine turns ok and sounds as though it wants to run but will just not Idle.

Dec 18th, 2009, 02:02	#2
Baffler Premier Member Last Online: Yesterday 15:03 Join Date: Dec 2002 Location: Co. Limerick, Ireland	I would suspect the flywheel/crankshaft position sensor, located on top of the gearbox bell housing, may be faulty or shifted its position... __________________ Liam... '96 854 TDI SE, '99 V70 2.5D S, '05 C70 2.0T Collection, '05 S80 2.0T SE, '15 V70 D4 SE Lux Nav.

Dec 19th, 2009, 19:52	#4
B20F Master Member Last Online: Jul 7th, 2016 21:43 Join Date: Mar 2007 Location: Zeist View Photos By: B20F	Did you clean the tip of the cranks.sensor? Best to remove said sensor and clean the tip with contactcleaner and a toothbrush. They can get dirty and that causes irratic behaviour. Another thing I would advise before doing anything else is to replace the rotor, dizzy cap, leads and plugs if not done recently. Those engines are very picky when it comes to ignition parts. Best is to use NGK plugs, bpr8es for the turbo iirc. __________________

Dec 19th, 2009, 18:12	#3
pettett4 New Member Last Online: Jul 2nd, 2013 12:00 Join Date: Jun 2006 Location: Northampton	Thanks for that, tested and seems ok, getting a reading of 220 ohms across terminals.

Dec 27th, 2009, 10:23	#5
pettett4 New Member Last Online: Jul 2nd, 2013 12:00 Join Date: Jun 2006 Location: Northampton	Hi again, thanks for the info both of you, I removed the flywheel senser ( swear words realy help in this situation !!) and although it looked ok I cleaned and replaced it, and the engine fired up and ticks over just fine now. I just cannot believe how such a small thing can make what seems a major problem. Thanks again chaps for the guidance. Mike Happy New Year.

Dec 27th, 2009, 11:25	#6
heyskull Heyskull Last Online: Jun 19th, 2021 09:23 Join Date: Oct 2007 Location: Ullock, Workington.	That one little thing makes the whole engine work. Just replaced mine and then found out it was the ignition amp at fault! £35 wasted. £5 for another ignition amp at the scrappys lol SC

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