turbo problem

james1992 · Dec 16, 2013

Hi all looking for some help with my p38 diesel 1997 reg.
When accelerating i get to 55mph and the turbo boost just drops off. Take my foot off and then put it back down and turbo comes back again until about 65mphish and then drops the boost again and then taking foot off and putting back down it comes back till 80mphish. Its also stops boosting if i am on any sort of incline and starts dropping speed?

Had a diagnostic check only fault was the 4th injector shorting/ earth fault.

Any help is really appreceated
Thanks

Datatek · Dec 16, 2013

james1992 said:
Hi all looking for some help with my p38 diesel 1997 reg.
When accelerating i get to 55mph and the turbo boost just drops off. Take my foot off and then put it back down and turbo comes back again until about 65mphish and then drops the boost again and then taking foot off and putting back down it comes back till 80mphish. Its also stops boosting if i am on any sort of incline and starts dropping speed?

Had a diagnostic check only fault was the 4th injector shorting/ earth fault.

Any help is really appreceated
Thanks

So, you have the answer, no problem with the turbo, just the needle lift sensor in #4 injector. Check the wiring and connector for damage or corrosion, otherwise fit a new injector.

james1992 · Dec 16, 2013

Will the lift needle sensor cause this fault as i presumed the sensor for idle speed?

Datatek · Dec 16, 2013

james1992 said:
Will the lift needle sensor cause this fault as i presumed the sensor for idle speed?

It controls fueling along with the CPS, it tells the EDC when exactly injection starts, no signal, the engine will go into limp mode.

james1992 · Dec 16, 2013

Datatek said:
It controls fueling along with the CPS, it tells the EDC when exactly injection starts, no signal, the engine will go into limp mode.

That was what i was trying to figure out if it was limp mode.
Thanks for the help again. Next job is to have a look at gearbox as it changes gear really harsh

Thor1950 · Dec 16, 2013

fluid and filter change how many miles on it?

james1992 · Dec 16, 2013

Filter and oil has been changed about 2month ago i have only done 600miles. I think the gear box is knackered

Thor1950 · Dec 17, 2013

james1992 said:
Filter and oil has been changed about 2month ago i have only done 600miles. I think the gear box is knackered

add a treatment to it might help, worth a try........ Lucas is damn good

Stufer · Dec 17, 2013

james1992 said:
Filter and oil has been changed about 2month ago i have only done 600miles. I think the gear box is knackered

Did you have this problem before changing gearbox oil & filter? Was it harsh before that?

james1992 · Dec 17, 2013

Stufer said:
Did you have this problem before changing gearbox oil & filter? Was it harsh before that?

i dont know as it is a second hand gear box i bought and fitted due to the reverse clutch breaking in the original one. I think i may have bought a broken gearbox

Datatek · Dec 17, 2013

james1992 said:
That was what i was trying to figure out if it was limp mode.
Thanks for the help again. Next job is to have a look at gearbox as it changes gear really harsh

Fix the engine problem, you may find it affects the gear shifting. Otherwise Lucas Transmision fix may help.

james1992 · Dec 17, 2013

Datatek said:
Fix the engine problem, you may find it affects the gear shifting. Otherwise Lucas Transmision fix may help.

Thanks i am going to buy a injector socket today. Do you know how to check transfer box with front prop shaft off?

Datatek · Dec 17, 2013

james1992 said:
Thanks i am going to buy a injector socket today. Do you know how to check transfer box with front prop shaft off?

The only way I know of checking the mechanical condition of the transfer box is to take it apart, but they rarely give trouble. You can check the VCU from the front prop flange.

james1992 · Dec 17, 2013

Datatek said:
The only way I know of checking the mechanical condition of the transfer box is to take it apart, but they rarely give trouble. You can check the VCU from the front prop flange.

Do i just turn the flange where the propshaft bolts to? I bought the car when the front propshaft had snapped the ujs?

wammers · Dec 17, 2013

james1992 said:
Do i just turn the flange where the propshaft bolts to? I bought the car when the front propshaft had snapped the ujs?

Gearbox neutral, Apply 15-20 LBs ft of torque to flange nut for one minute, in that time it should turn 25 to 30 degrees. If it won't turn at all no matter how you try it's knackered.

james1992 · Dec 17, 2013

wammers said:
Gearbox neutral, Apply 15-20 LBs ft of torque to flange nut for one minute, in that time it should turn 25 to 30 degrees. If it won't turn at all no matter how you try it's knackered.

Thanks i will check that tomorrow once i get my injector socket is it 27mm×80mm i need or 28mm?

turbo problem

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