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Diesel rough idle

 
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  • 1 Post By Gold2006
  • 1 Post By SwindonCruiser

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  #1 (permalink)  
Old 06 Feb 2014, 04:01 am
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Join Date: May 2013
Location: Swindon, UK
Posts: 18
Default Diesel rough idle

Hello

I've had issues with my 2002 2.2 diesel rough idling since before Christmas.

It's worse when cold and doesn't always happen. Driving was ok apart from smoking when accelerating.

An injector was leaking so I took it to a local RAC approved garage who fixed this. But it had no effect on the idling.

I took the car back to the garage and suggested the EGR valve was sticking.

They did a compression test and found two cylinders were very low. After some debate I agreed to an engine rebuild which they did. Decided better to spend money on a car I know rather than buy something else with a set of new problems... plus I couldn't bear to scrap Petie...

Car is still rough idling. Driving is excellent and there isn't any smoke when accelerating.

I have no money left after the rebuild to have any more work done!!

Any suggestions?

Should I live with it for now?

How easy is it to get to the EGR valve to clean it? i.e. is it a DIY job?

Could it be something else?

Thanks
Michael
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Old 06 Feb 2014, 07:31 am
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Join Date: Sep 2013
Location: Deland, fl
Posts: 334
Default Re: Diesel rough idle

Have you tried an injector cleaner and cetane booster?
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Old 06 Feb 2014, 07:49 am
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Location: sheffield UK
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Default Re: Diesel rough idle

You can get an egr bypass resistor but also worth checking the turbo hose for cracks
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Old 07 Feb 2014, 02:26 am
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Default Re: Diesel rough idle

Thanks Gold2006, no I have tried injector cleaner or octane booster. I'll get some.

Thanks reaper, I'd have hoped the garage would have checked the turbo hose when they refitted it! I'll check it.

My PT is worse than before the garage rebuilt the engine!

There weren't any engine codes recorded before the engine rebuild so I checked them again last night...

P0201, P0202 and P0204 are now recorded. These are injector wiring faults.

The engine management light isn't on. A quick bit of research says if the light is off then the codes are historical.

Best regards
Michael
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Old 07 Feb 2014, 09:18 am
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Location: Felton, Delaware
Posts: 20,501
Default Re: Diesel rough idle

Disconnect battery and step on brake pedal (brake light will drain residual electrical charge) and reconnect. That ought to clear stored engine codes and see if you get any error codes.
Diesel fuel injector cleaner ought to be given a try - as Gold2006 suggested -were injectors cleaned/replaced as part of rebuild?
Glow plugs replaced?
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Old 17 Feb 2014, 03:15 pm
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Location: Pretoria, South Africa
Posts: 14
Default Re: Diesel rough idle

SwindonCruiser, I had the same issue about a month ago. After some fiddling and frustration found the culprit to be a sticky diesel pressure regulator. Located on the side of the fuel rail. Hope this helps
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Old 18 Feb 2014, 02:55 am
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Join Date: May 2013
Location: Swindon, UK
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Default Re: Diesel rough idle

Thanks for the suggestions everyone.

Injector cleaner made no difference - I ran it for 300 miles.

Codes didn't go away. They became random. Sometimes P0201, P0202 and P0204 another time only P0201 and P0204 etc.

Took him back to the garage and they have fitted refurbished injectors and all is ok now

He idles and runs better than when I bought him

I've spent far more on this than logic says I should, but I couldn't scap a PT Cruiser!

Best regards
Michael
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Old 11 Jul 2017, 04:08 pm
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Join Date: Jul 2017
Location: norfolk , uk
Posts: 14
Default Re: Diesel rough idle

any ifo or even pics on where and what the diesel pressure regulator looks like ?
i have a bad idle problem with mine and suspect the fuel system,
when i start the car its smooth on tickover but as soon as i give it some revs it becomes rough .
if i turn it off and restart its smooth again until i give it some revs again
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