First 997 Turbo problem, lumpy, Won't go and vibrates.

Boba fett · 24 Jul 2016

Well just experiencing my first 997 Turbo problem.

Cruising home at about 80 on the motorway, and with out warning the car just did not want to accelerate, and when you did it really vibrates the car, and sounds awful. The idle is also lumpy and sounds like its running on 3 cylinders.

I got it home as I was not far but it was hard work crawling along a 30 !!

No nasty knocking noises or anything but sound ruff.

No dash lights, oil, water temperatures all fine.

Any idea's, experience or help is appreciated ??

kas750 · 24 Jul 2016

I would be looking for a detached hose initially.

Boba fett · 24 Jul 2016

I put my code reader on it, and it has come up with an issue, though it was in the pending codes, whatever the difference is.

Its:

P0304 Cylinder misfire number 4.

The was it sounds and the way it runs, I would have thought it would have thrown an engine light up !!

:?: :?: :?:

Boba fett · 24 Jul 2016

kas750 said:
I would be looking for a detached hose initially.

Blimey...where do you look ? these engines are shore horned in with nothing to see !!

Ill have a fumble about though thanks.

Norfolk &amp; Idea · 24 Jul 2016

Sensor (air/fuel) gone t1t5 up?

cheshire911 · 24 Jul 2016

Cracked coil plug(s) causing ignition short-out.
That's where I'd start. When did you change plugs and coil packs?

Boba fett · 24 Jul 2016

cheshire911 said:
Cracked coil plug(s) causing ignition short-out.
That's where I'd start. When did you change plugs and coil packs?

Plugs where done 500 miles ago, not sure on the coil packs

Clanky · 24 Jul 2016

If it's kangarooing, I'd say a split hose taking in un-metered air. I had that issue on an older Audi S2. Made for a horrific drive, although it would be less likely to affect it at idle, only on boost.

If it's a plug or coil pack failed, it might be worth looking for un burnt fuel coming through the exhaust.

Another unlikely but possible scenario, could be a timing chain or pulley slip. I've only ever read of one case where this has happened on a Metzger engine tho, so extremely unlikely.

Seeing as the plugs were done so close, it maybe just a connector came loose if it hadn't clipped in properly.

marconorth · 24 Jul 2016

Boba....My gut feeling is that this is almost certainly a coil pack issue.
You'll probably have read before that they are prone to cracking through age & heat on these Turbs of ours.
Obvs you'll be having things checked out, but those symptoms you described sound exactly what one would expect of a coil pack/s misbehaving buddy.

Boba fett · 24 Jul 2016

marconorth said:
Boba....My gut feeling is that this is almost certainly a coil pack issue.
You'll probably have read before that they are prone to cracking through age & heat on these Turbs of ours.
Obvs you'll be having things checked out, but those symptoms you described sound exactly what one would expect of a coil pack/s misbehaving buddy.

Thanks for all the help so far, and I hope it is a coil pack !!

I might sleep a little better now.

It will be going in next week some time hopefully, so a waiting game in the meantime.

reisskhan · 25 Jul 2016

If it was me this is how I would narrow it down before buying parts which may not be needed

Assuming that the computer is just giving a miss fire error on one cylinder try the technique below

1) Put ignition on and erase all codes

2.) Try swapping the cylinder 4 coil pack with another cylinder example cylinder 3

3.) Then leave it running or drive it and if it's still missfiring connect your computer back onto and hopefully it should say cylinder 3 miss fire now instead of 4

If so you know 100% it's the coil pack

Shouldn't be too much from Euro etc depending on if you want to change all 6 or not

4.) if swapping the coil packs over and your still getting miss fire on cylinder 4 swap the plugs over and see what comes up on the computer then

5.) If still saying miss fire on the same cylinder 4 after swapping over the coil pack and plug from a working cylinder then you got a bit more of a simple problem/fix

But try the above first as hopefully it's nothing too major and let us know how you get on

All the best

Scholester · 25 Jul 2016

I once had the TPS (throttle position sensor) go down on one of my motors but it was only the code reader that was able to pin point it.
Fingers crossed that your issue is pinpointed soon.

IMI A · 25 Jul 2016

If its not coil pack or boost leak could be a faulty turbo actuator rod - not expensive to fix. :thumb:

Boba fett · 25 Jul 2016

IMI A said:
If its not coil pack or boost leak could be a faulty turbo actuator rod - not expensive to fix. :thumb:

Thing that's worrying, when it went the car would barely excellerate, and the slightest bit of gas made the rear end shake and vibrate.

Is this what would happens if a coil pack went?

cheshire911 · 25 Jul 2016

It looks like a specialist job starting with coil packs.
When the plugs were changed there may be the possibility that a hose was not connected fully. When they do the plugs its around 3.5hrs labour on a 997 turbo, so there is quote a bit of dismantling at the rear end. That's why I mention perhaps something wasn't fitted back correctly on the air side of the turbo and intercoolers.

Let us know how you get on. My #1 suspicion would be coil packs. But I'm also curious to find out what is.

First 997 Turbo problem, lumpy, Won't go and vibrates.

Boba fett

Magny-Cours

kas750

Zandvoort

Boba fett

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Boba fett

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Norfolk & Idea

Mugello

cheshire911

Portimao

Boba fett

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Clanky

Suzuka

marconorth

Monza

Boba fett

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reisskhan

Trainee

Scholester

Barcelona

IMI A

Paul Ricard

Boba fett

Magny-Cours

cheshire911

Portimao

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