G'day all, I've been a long time lurker here and have really appreciated the good advice I've picked up - from the outside temp sensor install to the YD25 timing chain replacement. Here's a little problem I'm hoping the brains trust can help me with:
2007 STX,auto diesel with 101,000 kms on the clock. Bought new, always serviced at the local dealer, never had a problem.
Was getting it ready for a trip to Condobolin recently and became concerned by a rough idle - start up, select reverse and release the brake and it would idle out of the garage feeling like the tyres were flat-spotted. I took a bit more notice after this and found that as you pulled up to the traffic lights, this same lumpiness would occur, until the car stopped. Release the brake and let it idle forward and the lumpiness happens again.
It was nearly due for a service, so decided to get the service done and get the lumpy idle checked at the same time. Dealership found nothing on the diagnostics, but found lots of **** in the fuel tank, so remove and flush, new fuel filter and vacuum control valve and it was marginally better. They said that No.1 injector was showing a pressure variation around 1400rpm, possibly from the dirty fuel, so advised some injector cleaner and take it for a good run, which we did, 3000+ kms to Condo and back!
I run a scan gauge (another good tip from here!) and fuel economy seemed no worse (we were pretty loaded and had stuff on the roofrack). The lumpiness almost went away, but on our return to Brisvegas, it's as bad as ever. I started it up this morning and thought engine was going to jump off the mounts!
Dealership said before I left that they had a set of spare injectors that they used for diagnosis, but it seems to me that they'll just keep replacing stuff till they find an answer, rather than any diagnosis. At $120/hr, that gets a bit exxy!
Obviously, I'm open to suggestions for self diagnosis, and I've read quite a few threads on here regarding similar idle problems, but I'm also hoping for recommendations for a good diesel specialist, preferably with YD25 experience, on the north side of Brisbane. Any suggestions?
Thanks in advance,
Peter.
2007 STX,auto diesel with 101,000 kms on the clock. Bought new, always serviced at the local dealer, never had a problem.
Was getting it ready for a trip to Condobolin recently and became concerned by a rough idle - start up, select reverse and release the brake and it would idle out of the garage feeling like the tyres were flat-spotted. I took a bit more notice after this and found that as you pulled up to the traffic lights, this same lumpiness would occur, until the car stopped. Release the brake and let it idle forward and the lumpiness happens again.
It was nearly due for a service, so decided to get the service done and get the lumpy idle checked at the same time. Dealership found nothing on the diagnostics, but found lots of **** in the fuel tank, so remove and flush, new fuel filter and vacuum control valve and it was marginally better. They said that No.1 injector was showing a pressure variation around 1400rpm, possibly from the dirty fuel, so advised some injector cleaner and take it for a good run, which we did, 3000+ kms to Condo and back!
I run a scan gauge (another good tip from here!) and fuel economy seemed no worse (we were pretty loaded and had stuff on the roofrack). The lumpiness almost went away, but on our return to Brisvegas, it's as bad as ever. I started it up this morning and thought engine was going to jump off the mounts!
Dealership said before I left that they had a set of spare injectors that they used for diagnosis, but it seems to me that they'll just keep replacing stuff till they find an answer, rather than any diagnosis. At $120/hr, that gets a bit exxy!
Obviously, I'm open to suggestions for self diagnosis, and I've read quite a few threads on here regarding similar idle problems, but I'm also hoping for recommendations for a good diesel specialist, preferably with YD25 experience, on the north side of Brisbane. Any suggestions?
Thanks in advance,
Peter.
