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ShaunPDisco

Active Member

• Jul 24, 2018

• #1

Finally got my P38 running after new timing chains, head gasket, radiator and replacement injection pump.

Faults now logged are engine speed sensor fault. This occurs after blipping the accelerator and revs fail to drop for a few seconds. Any clues anybody.

Also fault with temperature gauge. Where is the temperature sensor on the M51. Will check to see if it has been disconnected!

 

brianp38dse

Well-Known Member

• Jul 24, 2018

• #2

The temp sensors are in the head under the inlet manifold.

 

Datatek

Well-Known Member

• Jul 25, 2018

• #3

There are 2 temperature sensors, one near the front the other in the middle, 1 for the ECU and the other for the gauge. I can never remember which is which.

 

Grrrrrr

Technician, Bodgit & Scarper Ltd

Full Member

• Jul 25, 2018

• #4

ShaunPDisco said:

Finally got my P38 running after new timing chains, head gasket, radiator and replacement injection pump.

Faults now logged are engine speed sensor fault. This occurs after blipping the accelerator and revs fail to drop for a few seconds. Any clues anybody.

Also fault with temperature gauge. Where is the temperature sensor on the M51. Will check to see if it has been disconnected!

Click to expand...

Would that not be the CPS sensor?

 

wammers

No longer with us, RIP

Donater

• Jul 25, 2018

• #5

Front temp sensor adjacent to injection pump is gauge sensor. Either brown (one wire) or blue (two wire) depending if AC is fitted. Next one (Green) between cylinders three and four is ECU temp sensor. On later models (1999 and on) an additional sensor (Black) is fitted between cylinders five and six to signal use of AC fans to assist cooling in case of overheat. Engine speed sensor is indeed CPS. If you remove CPS to check, only remove it from bracket it sits on DO NOT remove bracket itself.

 

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ShaunPDisco

Active Member

• Jul 25, 2018

• #6

Thank you Gents.

I had previously changed the CPS but that was now a long time ago! Don’t think I removed the bracket previously so will do again.

Will let you know if it works!

 

Grrrrrr

Technician, Bodgit & Scarper Ltd

Full Member

• Jul 26, 2018

• #7

ShaunPDisco said:

Thank you Gents.

I had previously changed the CPS but that was now a long time ago! Don’t think I removed the bracket previously so will do again.

Will let you know if it works!

Click to expand...

Odd really. Some people seem to keep replacing it and it is one part I've never touched. That's probably the kiss of death!