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Engine knocking during cold start

97boxsterred
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97boxsterred Member

97boxsterred

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On my 2005 Cayenne I have always had this problem with the engine knocking in the morning. This seems to die down after its warm. I took it to the dealer several times but they say everything is fine. Since I have other cars, I know this is not normal. The engine really shakes as makes funny noise as if something is not right. Could it have something to do with this coil cracking problem I have been reading about on rennlist? Any other possibilities?

Can someone send me the tsb: Bar Ignition Modules (Coils)

Thanks..

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Loren Member

Loren

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On my 2005 Cayenne I have always had this problem with the engine knocking in the morning. This seems to die down after its warm. I took it to the dealer several times but they say everything is fine. Since I have other cars, I know this is not normal. The engine really shakes as makes funny noise as if something is not right. Could it have something to do with this coil cracking problem I have been reading about on rennlist? Any other possibilities?

Can someone send me the tsb: Bar Ignition Modules (Coils)

Thanks..

Probably not related to the coils problem. The coils problem can cause stumbling and/or hesitation and/or misfires.

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cayenne69 Member

cayenne69

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I have the same problem and the dealer told me it's normal $%^&*. They told me a story about the secondary air pump... The noise is like a grinding and I think the engine will blow out in front of me when it cold after between 1-5 minutes on idle, but when it warm it running like a new one. I sent a video to a Porsche dealer and they told me never seen something like this but it's normal for this car... If somone in this world know the clue, please help us.

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97boxsterred Member

97boxsterred

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I took a video of the noise when I started the car up this morning. You can hear this banging noise after every 3-5 seconds and the entire engine shakes when this happens.

If anyone has a idea what this is please let me know. The dealer can't tell even when he kept the car overnight because its probably not silent enough in his shop, whereas in my garage its very noticeable and loud.

LINK:

http://youtube.com/watch?v=NauS9z7_zTQ

Edited by 97boxsterred
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RFM Member

RFM

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The problem occurs only at idle or higher RPM? Take note that it is not possible to rev. the engine above approx. 3000 RPM when the car is not in gear ( driving )

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97boxsterred Member

97boxsterred

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The problem only occurs at IDLE and in the morning. This usually happens for 3-5 minutes when I first start the car. I have never noticed it later in the day but then again I am outside (not in a quiet garage) and probably never notice.

When I drive the car there is no sudden drop of power, no hesitation or anything like that. Car runs fine.

Its just this banging sound that happens and the entire engine shakes violently from a cold start.

Can you hear the sound in the video I took?

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CT44 Member

CT44

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I took a video of the noise when I started the car up this morning. You can hear this banging noise after every 3-5 seconds and the entire engine shakes when this happens.

If anyone has a idea what this is please let me know. The dealer can't tell even when he kept the car overnight because its probably not silent enough in his shop, whereas in my garage its very noticeable and loud.

LINK:

http://youtube.com/watch?v=NauS9z7_zTQ

Wow that is scary sounding - NOT normal and NOT present on my CT

JR

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CT44 Member

CT44

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97boxstered engine is a V6, not a V8 Turbo. Complete different engine.

Just noticed that...is it normal for the 6? Can't imagine it would normal for any motor, maybe normal for the cayenne though...

Edited by CT44
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RFM Member

RFM

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It is definitely not normal they have to check it out what's wrong, but the V6 sound is a lot harder and rougher than the V8 in your car.

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97boxsterred Member

97boxsterred

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Yeh I know its not normal, I have owned many cars. The dealer has checked it out several times and says he can't find anything. I show him the video and he says he has to be able to hear it (replicate it) himself. So I have let him keep it overnight and then the next morning he still says he can't hear it. Probably because he's checking it outside on the street where there is too much noise. In the quite, closed garage in the morning its very noticeable. It only happens in the morning (cold start).

I have tried for 3 years now (on-and-off) to get this resolved.

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RFM Member

RFM

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97boxsterred

If your ( Porsche ? ) dealer is not able to diagnose the problem by lack of experience on this particular engine, try a Volkswagen dealer they known the engine better, it's a Volkswagen engine after all, it can safe you money, time and offence.

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jamesr Member

jamesr

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I also have the same issue with my 06' V6. It appears to idle really low at first start up for a moment and then shakes. This lasts about 2 minutes, stops and then it won't happen again for the rest of the day.

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RFM Member

RFM

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97boxsterred

I did a search concerning your problem, try this: remove the cover on top of the engine - on the left side in the intake manifold sits a roll ( cylinder ), the roll is not visible, the roll is attached to a vacuum control element at the left rear side of the manifold, you can see it with a mirror. Check for "play" - grab the roll connection with one hand to eleminate the "play" while someone else start the engine - check for difference in noise. Please rapport back.

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97boxsterred Member

97boxsterred

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RFM: I will try this later tonight. I want to report that about 2 weeks ago I changed the Air Filter (type K&N) in the car and this engine banging problem during a cold start was greatly reduced. Then last week I changed the spark plugs and this morning I didn't hear any of the banging. I don't know if this is just temporary, but normally it would happen everyday and for the past 1-2 weeks I didn't notice anything.

97boxsterred

I did a search concerning your problem, try this: remove the cover on top of the engine - on the left side in the intake manifold sits a roll ( cylinder ), the roll is not visible, the roll is attached to a vacuum control element at the left rear side of the manifold, you can see it with a mirror. Check for "play" - grab the roll connection with one hand to eleminate the "play" while someone else start the engine - check for difference in noise. Please rapport back.

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RFM Member

RFM

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Pull of the engine cover first, on the left side of the intake manifold you find the resonance chamber, on the front and on the rear of the chamber is a circular cover ( the rear one contains the vacuum actuator ). Between this two covers sits the roll, check for play on the rear side ( shake the roll up and down ) after disconnecting the vacuum actuator.

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  • 2 weeks later...
porha Member

porha

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Hello,hmm.nice topic.We have a Cayenne S and that car had some banging noise too,and the car was a few times checked on PTS2 and had no faults no misfires.Also it was checked everything you could possibly check..OK

We were listening and checking- all 2 years!

But,a few days ago first cylinder went away.The look from the inside was not good.Too much damaged,we decided to put in a used engine.I think its cheeper-just need to find a good engine for good price.

Our friends from Germany(2 different connections),and they do only Porsche for a long time,said that those cars had this problems from the begining and regulary is the first cylinder. Slowly it will bangs even when it"s warm.

The engine is still closed,so I have no better answers-yet(we looked on cam the inside of engine).

Sorry for my english

Edited by porha
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97boxsterred Member

97boxsterred

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Hi,

Seems like many people are having this problem and the dealers don't know what it is or how to approach the problem. My noise is less then before now after changing the air filter and spark plugs, but its still there.

I think we should contact Porsche directly before our engines fail, especially when they're out of the warranty period. Maybe we should start a online petition.

www.petitiononline.com

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