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Mitsubishi Shogun Pinin 2.0 GDI failed emissions

Posted By bob1957 Wednesday, August 28, 2013 12:07:17 PM
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bob1957
 Posted Wednesday, August 28, 2013 12:07:17 PM
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Hi everybody,

I'm new to the forum, so hello and would appreciate some help. My 2005 2.0 GDI Shogun Pinin failed it's MOT on emissions but the garage (Kwikfit) at the moment is not too sure whether the problem is the catalytic converter or oxygen (lambda) sensor failure (big difference in price). They put the vehicle on their diagnostic machine but it didn't recognise my vehicle, so they've got a guy with more up to date diagnostic equipment coming in next Monday who can hopefully determine the source of the problem.

The vehicle EMS light has come on and in the meantime I used my own RAC handheld diagnostics scanner to get the fault code which was read as P0170 generic fuel trim malfunction bank 1. I believe this indicates the problem is with the first oxygen sensor before the cat, but its a generic code so I would appreciate some guidance on this.

The emissions measurements at Kwikfit was at fast idle CO 4.459% and 4.803%, HC 280ppm and 308ppm and lambda 0.898 and 0.849. At normal idle CO was 5.111%. The engine is clearly running rich as I can smell it plus fuel consumption has rocketed.

The vehicle starts first time and idles smoothly at fast and normal engine revs. The engine does not hesitate when accelerated. The engine does not race at high revs when first started and does not go into limp home mode. I had these problems on a previous Pinin which was down to the throttle body firstly coking up then a sensor failure.

Sorry for the long post but I would appreciate some guidance and input from more experienced people which will help me with the garage on Monday. I did have have a search on the forum, which brought up similar problems.

Many thanks, Bob
RichTT
 Posted Wednesday, August 28, 2013 12:16:53 PM
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That code does not directly point at either cat or lambda.

Wait until the guy with decent diag gear comes out to look at it or move it on as a cat will definitely not cure that.

The cat may well be shot now as the amount of excess fuel running through it may have already seen it off but wouldn't know until the actual fault is cured.
Angus
 Posted Wednesday, August 28, 2013 12:30:05 PM
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bob

As you've already experienced; the number one cause of emissions problems on these direct injection engines is their excess EGR coking up the inlet manifolds and restricting the airflow - very like driving with the choke on. Blast-cleaning with crushed walnut shells is a popular remedy.

Anyone who thinks that a cat fault, or even an oxygen sensor, can cause richness like that shouldn't be diagnosing vehicles - or is only interested in how much money they can extract from you before they give up and send you away.

BEWARE KWIK-FIT!!!


.
Thema
 Posted Wednesday, August 28, 2013 3:20:11 PM
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Take note of Angus for he speaks the truth!

The Lambda values you've given show that the poor cat is doing it's best but is just unable to cope.
Wednesday, August 28, 2013 3:21:54 PM by Thema
bob1957
 Posted Wednesday, August 28, 2013 3:22:39 PM
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Thanks for your replies. I'll take the throttle body and inlet manifold off tomorrow and remove as much carbon as possible and see if that improves emissions. Fingers crossed the rich mixture hasn't killed the cat.
oldford
 Posted Thursday, August 29, 2013 2:34:08 AM
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Can you read live data?
What is the value of the Long Term Fuel Trim?
bob1957
 Posted Thursday, August 29, 2013 7:33:22 AM
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Oldford,

My hand held diagnostic scanner aint sophisticated enough for live data, I can only get freeze frame. It shows the following:

Trouble code P0170
Fuel SYS1 CL using H02S
Fuel SYS2 n/a
ST FTRM1 24.2%
LT FTRM1 12.4%

I believe this shows that the PCM is receiving data from the oxygen sensor that the fuel mixture is too lean so is making it richer to compensate. Is that right?

What I don't know is the cause (clogged EGR, clogged inlet manifold/throttle body, faulty oxygen sensor???). Is there a MAF fitted to the 2.0 GDI Pinin engine? As I believe a faulty MAF can also cause the problem (I'll check the workshop manual I have).

The vehicle is back at Kwikfit on Monday to be hooked up to more up to date diagnostic equipment, so hopefully I can get live data on the fuel trim readings.

Cheers, Bob
Mad-Eric
 Posted Thursday, August 29, 2013 7:44:48 AM
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All I would say on the subject is, there are better garages out there, and you may be wise to take it to them.

I am sure if you post your location a forum member may be able to help you on this matter.

Regards

Mad-Eric
oldford
 Posted Thursday, August 29, 2013 12:19:41 PM
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At the moment the fault code was logged the ecu thought the mixture was too lean.
So, the Oxygen sensor must have been giving a lean signal for a longer period.

I would check the exhaust for leaks (around the Oxygen sensor).
Otherwise it's a defective Oxygen sensor or it's wiring.

If you want to look at live data for the Oxygen sensor or the fuel trims you will need to clear the fault code first. That should also reset the fuel trims to zero. Interesting to know if the CO is better immediately after clearing the fault code (and the fuel trim).
Thursday, August 29, 2013 12:22:41 PM by oldford

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