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2007 Cayenne Turbo erratic idle / CEL


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Hi Guys,

I hope you'll be able to help me (just like a few months ago :D ).

This afternoon a friend rolled in to us with a 2007 Porsche Cayenne Turbo. It had a bad idle, and it was showing a CEL.

The problem started a few weeks ago, when he noticed it takes longer to start the engine and it runs bad on idle. As time went by it took more and more time to start it.

Today it felt really bad, as it took around 10secs. to start :unsure:

I hooked up my diagnostic machine, but it did not know the DME 7.1.1 specifically, and only offered EOBD. In this mode I can still everything what the ECU can, but it doesn't give out fualt code descriptions, as above P1000 they are manufacturer specific, and they may mean something else for Porsche, than for Volvo for example.

So to cut short, it gave me one code:

P1026

Could you give me the description for this? (I've looked at the OBD2 code table but did not find this.

My friend told me that some "Porsche specialists" in Romania replaced the 8 spark plugs a few days ago, and knowing their knowledge I set off remving a plug to check it :lol: At least they've put the correct plugs in....

The car has only covered around 200km since the replacement, and the plugs look vary bad. They are covered in black deposit, like it's overfuelling.

One interesting thing regarding the bad start is, that when the starter motor starts cranking the engine there's no spark at all. It takes around 5-6seconds until spark appears at the plug. (tested with one coilpack removed and one spark plug in it)

And when I checked the rpm with the diagnostic tool, it was around 130rpm for 5-6secs (that's what the starter motor does) - felt like the engine not even doing anything, than all of a sudden it went to 500 and fired into life....

That was all we could do today, as we had to go, so we assembled everything back and erased the trouble code. And around 30sec. running on idle the code cam back, but now in form of :

P12A1

Same as above, what does this mean?

Could you shed some light to this problem?

All suggestions appreciated.

Cheers,

Tibi

Edited by VTS_Tibi
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It is definetely P1026 and P12A1, as today I took it to an other garage had a BOSCH KTS650 hooked up to it, and it showed the same values and thes same codes.

I forgot to mention, that it sounds like it's not running on 8 cylinder. Not on idle and not even at higher rpms.

And the exhaust fume smells of coolant fluid...

I'll ask my friend what had happend with it, as it seems like there are some bigger problems with this car...

Edited by VTS_Tibi
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  • Admin

I don't know what else I can tell you - those are not Porsche codes.

I own the Cayenne OBD II 7.1.1 service manual and those codes are not in it.

See if you can find someone with a Porsche PST2, a Porsche PIWIS tester, or the Durametric software to read the codes for you and report back here.

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Thanks for your help anyway.

I think he'll have to take it to the Porsche Center in Budapest and have it diagnosed. Although he's afraid of the final bill, as last time the car was there they changed the fuel pump and it cost him 2500€ :o

Sound like it's time to order the Durametric with overnight shipping to RO. This will probably cost you 1/10th of 2500€...

JP

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This afternoon a friend rolled in to us with a 2007 Prosche Cayenne Turbo.

There's no such thing as a 2007 Cayenne.

:huh:

it was sold in 2008, but the build date shows 2007 (eventhough thy did not sell the Cayenne in 2007 the manufacturing of the new model has started... and this is one of the first restyled models....)

Edited by VTS_Tibi
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This afternoon a friend rolled in to us with a 2007 Prosche Cayenne Turbo.

There's no such thing as a 2007 Cayenne.

:huh:

it was sold in 2008, but the build date shows 2007 (eventhough thy did not sell the Cayenne in 2007 the manufacturing of the new model has started... and this is one of the first restyled models....)

That means it's a Model Year 2008. Model year is what parts, resale info, etc is based off. Try telling your dealer or parts dept you need parts for a 2007 Cayenne. That'll through them off... :D

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I don't know what else I can tell you - those are not Porsche codes.

I own the Cayenne OBD II 7.1.1 service manual and those codes are not in it.

See if you can find someone with a Porsche PST2, a Porsche PIWIS tester, or the Durametric software to read the codes for you and report back here.

Can a regular OBDII scanner read the error code?

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if you consider such top diagnostic machines like Tecnomotor PF Socio and Bosch KTS650 (don't know which exists over there) regular scanners than yes! :lol:

As Loren suggested, PIWIS or PST2. Without a correct code, doubt you'll get much help via Internet.

Edited by wirunner
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  • 11 months later...

hi, im new here and i'm looking for some answers,

i have the same car, cayenne turbo 2007 with 50k miles on the clock and i got the same problem

the fault codes that the car come up with are:

P1026

P1031

P0346, which is camshaft position sensor A(bank 2)

I have replaced the position sensors and the spark plugs were changed about 10k miles ago

P0346 fault is cleared and reseted the system, but still have the same problem and the first two codes come on again!

Does any one have any solutions or i should take it to the porsche dealers?

Thank you

Edited by sam_0020
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  • Admin

There's no such thing as a 2007 Cayenne - chances are it is a 2008 model?

What did you read the codes with?

P1026 and P1031 are not on my Porsche lists...

P0346 Camshaft Position Sensor, Bank 2 - Signal Implausible

Possible cause of fault

- Camshaft position sensor, bank 2 faulty

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  • 4 months later...

got P1026 on my 2009 Cayenne Turbo. CEL light is on. Since PIWIS tried to take me through the fault finding guide I assume this is the real fault code. Not sure why though. I cleared it and it is ok for now. will see if CEL comes back

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  • 1 month later...

I had a similar problem with 2009 Cayenne S. Durametric shows code P1023 & P1026. Had fault code erased but fault code comes back after test driving again. Changed both fuel pumps, fuel filter , pressure regulator & all spark plugs but didn't help. Long cranking starts & erratic idle & Engine misfire on kickdown. Will Order ignition coil & vent valve / line & hoping would solve the problem.

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  • 5 years later...
On 6/14/2011 at 3:33 AM, mikepui said:

I had a similar problem with 2009 Cayenne S. Durametric shows code P1023 & P1026. Had fault code erased but fault code comes back after test driving again. Changed both fuel pumps, fuel filter , pressure regulator & all spark plugs but didn't help. Long cranking starts & erratic idle & Engine misfire on kickdown. Will Order ignition coil & vent valve / line & hoping would solve the problem.

I know this is VERY old but I'm dealing with the same issues. Ever resolve this?

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  • 3 months later...

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