0093 Fault Code, Dealer Says Not Easy to Diagnose

[david12]

Well after 30,000 miles of blissful driving I have been hit with the amber light with car and spanner on the dash. This happened a few days ago resulting in a distinct lack of power. The car still drives but at a reduced level of power. Took to dealer who read code and advised BCM needs resetting according to their computer. Twenty minutes after getting the car back in the afternoon same problem, of course dealer closed by then. Took the car back next morning where the fault was still evident although there was no engineer available to view the information live, (this is at a main dealer). In the afternoon went back for the car and was advised that they took vehicle out three times and could not replicate the fault but 0093 was still there on pedal test, granted it drove as it should for day and a half and fault is now back today. Rang dealer for appointment next week and was advised that they may need car for few days as difficult to diagnose 0093 fault code. (surely not I said, is this just trial and error)?

Of course once engine is turned off everything resets although the pedal test still reveal 0093 code. When the fault occurs, on idle the engine revs up to say 1000 rpm, pressing the brake pedal reduces the revs to normal. Anyone experienced this and what area could we be looking at. Car is a 57 plate Z30DT V6 auto.

Thanks members for your thoughts.

[Woody]

Just a bit of googling but does this help at all ?
Generic OBD Error Code Details for P0093
Fuel System Leak Detected - Large Leak

check leak off pipes

and read this http://www.fixya.com/cars/t12982100-p0513_p0087_p0093

[david12]

Thanks for taking the time though not sure if this is the a way forward. I am sure members hers will have experienced this before.

[Critch]

Surely by it thinking it has a fuel leak its easy enough to do a full hand and eye check of engine bay an fuel lines

then look at rail pressures etc

i wouldn't have thought be that hard to diagnose.

i imagin they would require car for full day should anything need to be removed etc

maybe try somewhere other than dealer

[david12]

Thanks. The report sheet states: Tech test fault p0093 rail pressure range,
performance
need to program BCM & recheck

[Celes]

P0093 is as easy as it gets on this *insert swaring words here* of an engine. Most likely fuel pump related. Mine has just started doing this again after 20k of peace. I'll have to check the fault codes tomorrow but this time it's losing power a bit differently...

[david12]

Let me know how you get on please

[iani]

I've had a P0093 that I cleared and didn't return after I replaced the fuel filter, I had a fair bit of air in there so it hadn't been sealing well.

[Celes]

I've had a P0093 that I cleared and didn't return after I replaced the fuel filter, I had a fair bit of air in there so it hadn't been sealing well.

How long ago was that? 6, 8 months? 10k, 20k miles? I don't think I can completly trust this engine even if it runs perfect with no fault codes.

[Celes]

Ok tried the code reader but it didn't work. The engine runs but not as it should obviously...one moment I'll be accelerating with full power up to 140+ the next it won't have enouh juice to pass 3000rpm...