Referencing the post on the 2.5 running poorly, my 603 runs fine when started, but after preglow kicks off then it bucks and runs rough until it warms up. After warm it runs great. Fuel filters all new. Was wondering if the egr issue that GSXR had wrote about the 2.5 could be an issue with my 603.

shopforum/showthread.php?t=212097&highlight=wastegate+swap

Does it run rough or just idle rough?

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Gone to the dark side

- Jeff

It's actually running rough. If you throttle up a little it chugs pretty bad. it's almost like its dumping to much fuel in or maybe an injector is popping to early and dumping fuel at the wrong sequence.

With the 603.970, start with a compression test. Does the car use oil?

If the compression comes back good and it isn't burning much oil I would get the fuel injectors looked at next. Do you know how many miles are on them? Does using lots of cetane booster help?

-Jason

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.

Engine uses @ 1 qt every 1k miles. I was thinking that its like 1 injector is popping early when its cold; if that's possible; then after its warm everything is ok.
Does anybody know of any emissions garbage that might be at fault.

The EGR valve on your car is very simple, and disconnecting it for testing will not affect any other system.

1 quart every 1000 miles? Hmm.... I'd look into that compression test.

-J

Ok, I'll look into doing the compression test. I don't like where this is going. I've got a small leak. I know when my boost pressure line came off the intake manifold recently it made a mess on the left side on eng. comp. due to the blow-by I have.

Lots of blowby too? This isn't sounding good You do know about your engines troubled past right?

-J

__________________
1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.

Hmm, I might be going to Greenville on the 17th for a coach, maybe a car too?

__________________

Gone to the dark side

- Jeff

Hey Jeff, thanks for the input. I reacon I'll be doing a compression test soon.
I'm not too far from Greenville. Have you got a car lined up?

No, another Prevost. It'll tow a car though.

__________________

Gone to the dark side

- Jeff