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Discussion Starter · #1 ·
My dad has a 2002 p38 diesel with 73000 miles on the clock. Recently it has had a problem where the car will rev itself up, a bit like its hunting but the revs will go between 900 and 2000. It was taken for a session on test book, not at the dealers but at a local garage, this showed that at some time it was overfuelling. The guy who done it said that it was either the injection pump or the hot start device that it had fitted was faulty. So doing the cheapest first we replaced the hot start device, now it doesnt rev up on its own, and it starts great but it has a misfire when it starts. As the revs drop the misfire dissapears and the car runs great.
Does it sound like a faulty hot start device or is it time to start saving for a new pump?
Any advice is appreciated.
Mark
 

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Discussion Starter · #2 ·
We are still trying to sort this problem out, the missfire got worse so we removed the hot start device. Now it starts with no missfire when warm but when cold it missfires like crazy and it blows out clouds of black smoke. It is now in with a diesel specialist, who has been instructed to test and replace the injection pump if necessary.
I had a call from him earlier today as they suspect the psi power box to be the fault, one of the mechanics said that he has seen a few of these go faulty, and as they are wired into the pump they instruct the pump to overfuel. He also said that this will cause the ecu to throw up the fault codes that we had.
We will know more in the morning as the engine will be stone cold.
Has anyone ever heard of these boxes going faulty before?
Thanks
Mark
 

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Discussion Starter · #4 ·
Thanks Ally, you`ve raised my hopes a bit. Dad left the car at the garage overnight and i am going to see them this morning to see if unplugging it worked (fingers crossed). He is expecting a bill for a new pump so it would be great if this works. Will let you know how it gets on.
Mark
 

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Discussion Starter · #5 ·
Well the car was ok at 6 o clock last night after standing since 11.45am, and again this morning after standing all night. So removing the psi power box seems to have worked.
No more missfires :dance:
Mark
 

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Discussion Starter · #6 ·
Well the fix was short lived as its now missing again on start up and chucking out black smoke ( i presume this is due to over fuelling). It also has to be cranked over for approximately 15 seconds before it attempts to fire. Its not too bad when its warm, so its back to the drawing board Any ideas anyone please.
Mark
 

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Check the glowplugs. f they're end of their lives then it's hard to start when cold. I have the same issue with my rangie. the glow plugs were faulty and had a hard time starting up when cold. Also make sure your battery is good, cos the diesel needs a higher rated battery than the petrol.
 

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Discussion Starter · #8 ·
Thanks for the ideas but the battery isnt very old and has been checked over, thats ok and i replaced all the glow plugs about 3 months ago as they failed completely.
We are now considering having the injection pump replaced and rule it out once and for all. It will be a garage job as i dont have the tools for timing it in, i wouldnt mind buying them but i wont ever use them again after.
Mark
 
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