10 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHStuck Lifter?
Reported repair
Replace whole cylinders worth
Reported resolution
1
Reported fixes
0
Unsuccessful attempts
1
Discussions
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 a fix
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Reported fix
Actually went in and replaced the whole cylinders worth. (the 2 intake and 2 exhaust) Fixed the problem.
Leading evidence: 'Replace whole cylinders worth' (1 discussions report resolution; 0 report an unsuccessful attempt). Across 1 matching discussions, The most frequently discussed action is 'Replace whole cylinders worth' (1 discussions). For that action, 1 discussions report a resolution and 0 report an unsuccessful attempt. The most frequently reported fix is 'Replace whole cylinders worth', supported by resolution reports in 1 discussions. 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.
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
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
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
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
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 contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion
Maybe its almost time for your summer oil anyway and you can inspect the oil and filter.
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 contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion
Some have reported that changing oils cured many strange valvetrain noises.
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion · Original poster
Mobil1 vs others is debatable still, having read up on the Zinc issues, maybe M1 is not the ideal oil going forward if its formulation really has changed over the last couple of years.
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.
10 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.
Started the car this morning and heard a loud knocking noise in rhythm with the engine. Turned it off. Started it again, still there, it increased with throttle.
Checked codes, nothing.
Opened hood, looked underneath, visually all seemed fine. After reading here and other places decided to give it a go, pulled out of garage into street, still knocking/ticking but seemed slightly better except it sounded like it was trying to misfire slightly with throttle. Down the street still making noise but pulling fine at part throttle, then as I stopped I could not hear it at idle but then it came back as I accelerated out of the side street. Within 100 yards gone completely. Drove a few miles, stopping at side of road several times to listen and came home, now everything seems fine and sounds normal.
Checked codes again, nothing again.
Car is a '02 with 68k miles, reman factory engine has 10k miles on it. Oil is about 2000 miles old (3 months). Ambient temp in garage about 42F (totally normal, maybe a bit warmer than average over the last few months).
Do you think this was a stuck lifter? Have not had this happen before on any car. Noise definitely started as a knock as compared to a ping or a tick if that makes sense, then as it got better was more of a loud tick. Car is driven almost every day but sat over the weekend.
I'm already ducking, Krazy :-) Mobil 1 0W-40...
I've thought about this though, I think the 0 weight is totally appropriate for my Colorado winter climate. I do and have taken it out when it is between 0 (the low this year) and 32 degrees out. My garage stays at about 40 at the lowest. Sometime I will be starting the car at very low temps though when I am out and about. I just got back from a trip to the grocery store, 32 degrees out and snowing. Car loved it.
I am planning a trip out west this summer and am considering a weight change to 5W-40 for the summer but don't really think it will make much difference. The point of the lower range is for the lower temps, right?. If you are in a hot climate, is there really a practical difference between 0 and 5 on the low end of the scale? Wouldn't the oil just behave as whatever weight is appropriate for the ambient temp at start-up? Plenty of people on here run 0W-40 year round in HOT climates without issue.
Mobil1 vs others is debatable still, having read up on the Zinc issues, maybe M1 is not the ideal oil going forward if its formulation really has changed over the last couple of years.
I was hoping not to devolve this into an oil thread through....Sorry for my long response.
LOL, Im not going to bash your oil but I think JR said the 5W-40 is fine year round. Hate to hear your still having cold weather. Swam all day Sunday down here. Some have reported that changing oils cured many strange valvetrain noises. Just observations so who knows?
If the "knocking/ticking" cleared up, I would think alls well. Maybe its almost time for your summer oil anyway and you can inspect the oil and filter.
Thanks, it seemed OK for the grocery run....We'll see what happens tomorrow morning after it sits and gets cold again. Hopefully like ArniO's above the issue will just be gone....
For 02+ w/ variocam plus regarding intake lifters:
A frozen "low" wouldn't be noticeable on idle, since they should all be in that state. It would give issues to the car when revved up.
A frozen "high" lifter would create rough idle and CEL, but drive fine since lifters are locked "high" at some limit RPM (i think 3.5k)
Not sure how a completely collapsed intake lifter or exhaust lifter misbehaving would present itself.
A couple years ago the car sat for two months over the winter. When I started it there was a tick. Left it idle for 20 min and all was gone. Never came back.
See, that I would understand. In my case I've left it for periods from 1 up to 10 days all without issues since this most recent oil change. Now it did this after just two days of sitting. I dunno, hopefully it does not come back. At least I now know what it sounds like...
I just had a stuck lifter on my 02. Actually went in and replaced the whole cylinders worth. (the 2 intake and 2 exhaust) Fixed the problem. It was an incredibly loud tick/knock. So bad I didn't want to start it until resolved.
This is a source reference. Confirm exact model applicability in the original material.
