26 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHLifters or Piston Slap noise ??
Leading reported evidence
Replace me
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
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0
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1
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Read evidence and context
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Leading evidence: 'Replace me' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'slow demise given you�ve kept an eye' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Check noise vs revs a bit later' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suspected cause
Probably a slow demise given you�ve kept an eye on the oil level.
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Suggestion · Original poster
I’ll check the noise vs revs a bit later when the wife gets home.......my leg isn’t long enough to do it myself
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Suggestion
I guess I am glad I never spend money on replacing the IMSB since the scoring was going to be the problem for me.
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Suggestion · Original poster
It’s still there at idle after a 20 mile run but not as much
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
26 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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I have a 2004 C4 that had a partial rebuild 5 years/20k miles ago. It had cylinders 4, 5 & 6 relined due to bore scoring.
It uses about 1/2 litre of oil every 1000 miles and it looks like there is slightly more soot on the left exhaust than the right.
The videos below were taken after a cold start on the drive so no driving before the video
Here is a video of the passenger side ie: cylinders 1,2,3
You Tube
Here is a video of the drivers side ie: cylinders 4,5,6,
You Tube
Am I being a little paranoid that scoring has returned or is this a lifter or something less drastic sound than early bore scoring - again?
Thanks in advance
PS..sorry about the rusty manifold bolts...its on the list!
What type/grade oil are you running? Last oil change? The 4/5/6 manifold is completely rusted, so what you are hearing may be exhaust leaks. You are going to have to solve that problem first, not just the bolts.
I agree with DBJoe, you need to replace your exhaust manifolds first...they may be the source of your noise...I have never seen them so rusted on any cars here in the northwest. Where are you located that it is so rusted.
The integrity of the exhaust manifolds looks fine to me. Just some surface rust. If you had an exhaust leak, the sound would be distinctly different on one side versus the other. I had one on a past vehicle due to a failed weld. Very different sound.
I can't comment on the ticking noise. It doesn't sound quite like the other bore scoring videos I have listened to. It sounds like valve train noise, but I don't know what it would be. Lifters rarely go bad. Some of the experts on the site will hopefully weigh-in.
Thanks all for you comments....I’m in the UK....the manifolds are rusty and the bolts look quite bad however, I’ve been through my local trusted Indie recently and my local OPC for a free inspection two days ago ( whilst fixing a screen seal FOC) and neither had any concern about the exhaust....it’s on the list of things to look at when funds allow.
I’ll check the noise vs revs a bit later when the wife gets home.......my leg isn’t long enough to do it myself
I had sticking lifters that sounded exactly the same, however mine only 'Stuck' once the car was hot and had been revved hard, then I always got a CEL and misfires along with the ticking. Have you run a diagnostic on the car?, any misfires or pending. The lifter issues relate to the intake, if they stick your car over fills the cylinder below 3k and from what I have read always triggers a CEL. Mine used to free off once the car cooled and then ran fine again.
Here is the
thread
on mine and the repair.
Does the noise subside after about 30-40 seconds of engine running? And only when cold. My Boxster sounds the same from a cold start but only for a 30 seconds or so. I always attributed it the lifters.
I tried slowing down the video to 25% or 50%. It sounds like a Rat-a-Tat-Tat sound, like a series or repeating thirds. The only thing I know of that has anything to do with that kid of period are the 3 cylinders or IMS.
I agree that you cannot rule out exhaust. It even sounds like loud injectors.
How many miles on the engine all together?
My car has 84,500 miles. It started making a piston slap/lifter noise around 60k. I have owned it since 47k. I drive it in New England all year so maybe I scored the cylinders. On the positive side, it runs great, no codes on durametric, uses only a quart of oil per 1400 miles. My UOAs have been pretty typical for a normal wearing engine.
I am just driving it for now and will look into rebuild when I feel that it is overly damaging the engine to drive it.
^^ a good plan. Keep a keen eye and ear on it. Look for changes in sound. Mine has been loud on cold start since 49,000 miles. That was 10k miles and 18 months ago. Not much has changed for me.
yup, I tried redline 5w50. Oil pressure was much higher to the point that it made me nervous. It was 2.5 bars when hot and at idle. Back to using 5W40.
It really drives nice and never smokes.
I�m no expert, but doesn�t sound right for sure. Your oil consumption doesn�t help me thing good things. My 100k 996 doesn�t consume any measurable amount, Does it smoke on Start up? I�d guess it�s likely cylinder noise in its early stages. Probably a slow demise given you�ve kept an eye on the oil level. There are many worse on the internet but this sounds very similar and If the narrator is right...
You Tube
Has the noise gotten worse over time? Have you scoped it? Any idea how much longer you can run it? And do you track the car?
Also, I�ve never heard of Ceratec. Do other folks use it on Porsche engines?
Noise hasn't gotten worse over time. I never scoped it. Since it hasn't changed much over 20k miles, hard to say how long it will last. I do not track car. I drive it about 50 miles a day 3 times a week, mostly highway miles.
Some people think Ceratec may extend the time before scoring takes over completely. It's hard to imagine that RL, Motul and any other quality synthetic oil doesn't do enough to protect the engine without introducing oil additives like Ceratec. I may have just fell for the Ceratec marketing. But maybe it is working for me.
I got tired of the knocking and bought a rebuilt 3.6. Oil consumption got a little worse but it was also killing my cats. I was at 95k and 3644 hours on the original motor. Knocking since 60k. I guess I am glad I never spend money on replacing the IMSB since the scoring was going to be the problem for me.
