26 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHRattle from engine area at startup
Reported or suspected cause
timing chain rattling around
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
Read evidence and context
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that report identifying a cause
1
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0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Reported cause
It turned out to be the timing chain rattling around because the timing chain retension pin had broken off.
Leading evidence: 'timing chain rattling around' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'timing chain rattling around' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Replace oil a week ago an went' (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.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
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Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
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Performed · outcome unconfirmed
I changed the oil a week ago an went from 10w40 to 5w40.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that performed work without a confirmed outcome
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Performed · outcome unconfirmed · Original poster
On the drive home, the engine ran perfectly with no abnormal noises.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that suspect a cause
1
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Suspected cause
2nd was the real scare - my tire was so worn that a thin piece stripped while I was going about 110K on the highway, and the loose piece was flapping around in the wheel well and I really thought that it was the ims at that moment.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that suspect a cause
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
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Suspected cause
Probably a spot where you drove more than once that has loose rocks from constuction or something....
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Suspected cause
2nd was the real scare - my tire was so worn that a thin piece stripped while I was going about 110K on the highway, and the loose piece was flapping around in the wheel well and I really thought that it was the ims at that moment.
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
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
1 acknowledgements have no verified action link; they do not establish a repair result.
This afternoon, as I started my '01 996 after it sat for about 30 minutes, there was a terribly loud rattle from the engine area. It sounded like somebody was shaking a bunch of ball bearings inside of a metal box. <img border="0" title="" alt="[Eek!]" src="eek.gif" /> I immediately shut the engine off and the rattle went away. I restarted the engine and it started rattling again. Instead of shutting it off, I gave it a little gas to bring the revs to about 2K RPM and the rattle went away. On the drive home, the engine ran perfectly with no abnormal noises. Anybody have any idea what this rattle could be? Could it be something in the induction system or could it be something in the valve train?
Do you mean a cadence like shaking a can of spray paint, or like diesel clatter? Probably noisy hydraulic valve lifters, very common for some oil to drain out of them with the engine off for a while. Should stop at idle within a minute or two on a cold start, less time with warm oil such as you describe.
If that is what it is, it is not harmful or a symptom of distress, not unusual in these cars once the motor fully loosens up at 10K or so. Unfortunately it cannot be remedied either, you can ask but Porsche is not going to get you a new motor for that.
I agree with Sloth, besides which being towed in pops you close to the head of the line, I think they have to begin work within 24 hours.
Good time to get anything else pending done.
I had a rattling upon startup that had bicycle bell sound to it. It turned out to be the timing chain rattling around because the timing chain retension pin had broken off. PCNA replaced it with new engine.
If it sounds wrong, stop the engine and get the car to a dealer via flatbed towtruck.
My '99 C2 has a loud metalic rattle when it first starts in the morning. Sounds like something is loose with, or in, the exhaust. Only happens when cold and has always happened...weird but doesn't seem to be a problem. (I've put 25,000 miles on it.)
I have driven it about 1,000 miles since i purchased it. Nothing exciting came out of the PPI other than the A/C unit. The PPI was done by an indy who works on nothing but Porsche's. I started the car up, lowered the top, sat for about a minute in the garage, drove it about a 1,000 yards and no problems, than all of a sudden i heard the loud rattle (like marbles in a tin can) coming from the back of the car. I stopped the car and the noise then immediately stooped. I ooked underneath the car and in the engine and saw nothing. I got back in the car and went on my way and immediately heard the noise again and once again, stopped the car, got out and looked around for something in the street maybe and nothing. Being only a 1,000 yards or so from the house, i turned around to go back home and the noise was gone so i went back on my way to the gym and drove for about 15 more minutes and nothing, no noise or anything. After about an hour at the gym, i started it up, came home and no noise at all. Very weird. I was planning on getting the IMS done this winter but now i am scared to drive it. thoughts....
I would do it asap and not this winter. Also, tow it there for safe measures! Seriously I would!
Because the noise went away, it might not be IMS though... Get it checked out for sure!
WOW ...from the dark ages... when time was forgotten ... there were mysterious rattles.
Now, through the advances of Jake's brain.
We know that the IMS likes to rattle when it is mad!
Of course, we also know that chains, lifters, and all sorts of other stuff can rattle too.
Fortunately, that sound isn't it. The sound only occurred while driving and then it seemed to have gone away for good. Thank you everyone for the advice which i sadly already knew but was hoping for something less negative than take it to the indy and open your wallet. Thanks again. I'll let you know the outcome
If it is only when you are driving and let off the gas, it could possibly be a loose baffle/pillar in the muffler as mentioned above. Could you tell a difference if it was the rear left or right?
I hope for your sake it isn't the IMS, but realistically if it is, and the engine is not shot yet, you could still save it. The only difference here is that you would be getting it fixed now rather than the winter...
Keep us posted!
I changed the oil a week ago an went from 10w40 to 5w40. After it sat for a week I tried to start it and upon start up it made a little rattling noise which sounded like lifters that had bled down. It hasn't done it since so that may have been what you heard. Not sure though.
I believe lifters make a rhythmic ticking sound, rattling could be anything from lose heat shields, lose tail pipes, muffle baffles, cats or even the dreaded ims bearings bouncing around.
good news. It was just some rocks caught up in the undercarriage but i have learned my lesson and have already scheduled the IMS retrofit for two weeks from today. Thanks to all those who crossed their fingers for me.
Very glad this worked out for you...
I am puzzled about how you can hear rocks rattling and decide to do an IMS. Seems to be more fear than logic.
I understand your concern about your car.
Now that I look back, a similar fake IMS noise happened to mine. Well once it was a loose baffle in the muffler and I knew 100% that it was an internal muffler part partying in there...
2nd was the real scare - my tire was so worn that a thin piece stripped while I was going about 110K on the highway, and the loose piece was flapping around in the wheel well and I really thought that it was the ims at that moment. So I shut the engine off right away and the noise was still present, so I knew it had to be something external, thank god.
That's a great test, if it ever happens at highway speeds, and if I have the presence of mind.
I hope you weren't wearing white shorts that day. It would be tough to expain how a flat tire made you crap your pants.
Prob white pants since it was a hot Montreal night!
I literally said "Oh Noooo" to my friend, and he's like "what, what?" Then when I turned the engine off and the noise was still there flapping away, rubber on the plastic inside of the wheel well, It just felt good! Tire didn't even deflate.
Since that day, I love my car even more for playing a joke on me!
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