17 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHSmall Random Idle Shimmies
Leading reported evidence
Clean icv (idle control valve)
Suggestion or failed attempt
No successful repair reported for this finding.
0
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 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
I would also check and clean the ICV (Idle Control Valve) on the side of the TB.
Leading evidence: 'Clean icv (idle control valve)' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Clean icv (idle control valve)' (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.
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
Yeah, I was very close to replacing the injectors.
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 · Original poster
I think the PPI would have caught that & I recently changed the oil.
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
I should have done this test first, but I chose to just replace stuff since the car was 20yrs old with no maintenance history and I enjoy wrenching.
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
I�ve tried the ignition reset (key on for a minute then off, then fire up).
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.
17 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.
Is this something I should be concerned with? I've only had the car 3 months so I'm not sure what's normal:
When I'm sitting at a stop light with the car warmed up I can hear & feel a random "burble" or "shimmy" in the idle every 5 or so seconds. It's a bit random & not rhythmic at all. I can't see it on the tach, the needle stays pretty solid. AC on or off it doesn't matter.
No other issues. Durametric doesn't report anything. The idle speed stays solid, varying by 40 RPM every once in a while but that variation happens much less frequently than the shimmy that I feel when driving it.
1999 C2 w/ 38K miles. New plugs & coils.
Is this normal or should the engine idle butter smooth?
oh I�m all too familiar with the shimmy. I also have a 99 that shimmied with stable rpms and no codes.
could very well be a vacuum leak.
likely candidates;
1. AOS bellows is torn
2. Oil filler tube is cracked.
I replaced both and shimmy is gone. Runs like a top now.
smoke test could narrow it down quickly.
report back!
OK. I'll do some research on doing a smoke test. I doubt it's the filler tube. I think the PPI would have caught that & I recently changed the oil. Could be the AOS or one of the vacuum tubes. I also read that injectors can cause it.
Yeah, I was very close to replacing the injectors. My AOS had a ripped bellows and I was certain this was the cause. But it wasn�t. I handled that filler tube a dozen times in my first six months of ownership and didn�t notice any issues until one day it was nearly split in half. I�m certain it had a crack before it got to that point. Looking back, a smoke test would have saved a lot of time.
Not sure. Google evap smoke tester. I should have done this test first, but I chose to just replace stuff since the car was 20yrs old with no maintenance history and I enjoy wrenching.
does the car rev easily to 6k or sound/feel labored? Just my experience but after the vacuum was improved the car revs so much easier and the shimmy is gone.
I would also check and clean the ICV (Idle Control Valve) on the side of the TB. The ICV has a bad tendency to get gummed up inside. Get it off of the TB, and clean it with TB cleaner. Soak it good and you can use a 9V battery with some leads to cycle it back and forth. Use Q-tips to clean it inside. It is not black inside...it is really silver. So cleaned up it will be all shiny silver inside.
If you�re up to it wrap a piece of duct tape around the area most likely to crack in the oil filler tube and see it you notice a difference in the idle.
here�s a pic of my broken tube. Same crack location as many others I�ve seen. I�m certain there was a crack there before it got to this point. And I handled this thing a dozen times and noticed nothing before one day wrenching it just appeared. Weird.
I�m in a similar situation. 2004 base coupe, 75k miles. Car consistently idles around 650rpm hot or cold. Small -+20ish rpm fluctuations which I understand is normal. However my relative idle is about 100rpm low which I believe is leading to my slight shimmy, passenger seat shaking symptoms.
I�ve tried the ignition reset (key on for a minute then off, then fire up). No change. Tried pulling the oil cap with it running and the idle actually improves.
Interested to see what fixes yours.Out of curiosity how does yours idle?
Mine warms up normally. So it will idle higher when its cold but when it's warmed up and I have it on the durametric, that's what I see. Is 700 the normal idle for these? I can't remember.
