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YOUR RESEARCHStumbley idle - 100k miles, replace coils and plugs?
Leading reported evidence
Use carb cleaner
Performed · outcome unconfirmed
No successful repair reported for this finding.
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0
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1
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Stumbley idle - 100k miles, replace coils and plugs?
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Leading evidence: 'Use carb cleaner' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check icv (can i' (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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Performed · outcome unconfirmed
I cycled the valve with a 9V battery and used Q-tips to clean it.
Stumbley idle - 100k miles, replace coils and plugs?
Check icv (can i
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Suggestion · Original poster
Figured I could spray the MAF with MAF cleaner and check the ICV (can I use throttle body cleaner on the ICV?) pretty quickly.
Stumbley idle - 100k miles, replace coils and plugs?
Check obvious issues (reputable indy)
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Suggestion · Original poster
Had it post-buy inspection done to check for obvious issues (reputable indy).
Stumbley idle - 100k miles, replace coils and plugs?
Check oil filler tube
Suggestion or failed attempt
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Suggestion
Check the oil filler pipe for cracks...well known for a vacuum leak.
Stumbley idle - 100k miles, replace coils and plugs?
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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.
8 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261026T124918Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I've had my 1999 for about about 1,000 miles. Just crossed over the 100k mark. Had it post-buy inspection done to check for obvious issues (reputable indy). Only issue related to engine was leaky coil tubes (and minor RMS leak which goes away after driving). However, I've noticed while idling at full temp the engine is a little stumbly under 1000 rpm. It's not terrible, just you can feel it bumbling around a bit. I've read a lot of threads, and one starting point is spark plugs/coils. I have no history on the car, so without pulling all the plugs to inspect them, I don't know the last time they were changed.
I found this amazing writeup,
https://rennlist.com/forums/996-foru...-detailed.html
It seems doing coils,plugs,tubes is a "doable" home diy, but also a time investment (and tool investment as new to this). So far I've only done motor mounts, and while I want to get into more DIY I don't want to do something for nothing.
Would replacing all three items make sense for the idle issue, or should I start somewhere else? I do have a list of other things that need to be preventively done (water pump, coolant flush, trans fluid, AOS)
�Stumbley� idle could be any number of things including MAF, coils,plugs etc., but it�s often related to a vacuum leak. There are any number of hoses and joints (rubber elbows and couplings) that could have cracked and/or dry rotted over the years allowing air to enter the system under vacuum.
I would start with cleaning/or replacing the MAF sensor. Then clean or replace the throttle body ICV (idle control valve). It gets gummed up really bad and at 100K miles most definitely needs to be looked at. Then a refresh of coils and plugs. Again, at 100K miles they need to be replaced. Check the oil filler pipe for cracks...well known for a vacuum leak.
Figured I could spray the MAF with MAF cleaner and check the ICV (can I use throttle body cleaner on the ICV?) pretty quickly. But MAF is in place with a security torx, which I don't have. And the T30 I have slightly stripped the ICV bolt.
fun times !
Okay bought security torx for MAF, and had to resort to impact driver to get ICV bolts off, dang they were on tight.
This thing is super black inside.
Going to figure out how to activate it with battery and see if jammed with soot.
I hooked up positive to center terminal and negative to "top" and it snaps open/closed. But on the "lower" it doesn't do much. Will clean first and try again, though I'm not really sure what it should be doing.
Carb cleaner is best choice over Brake or Throttle Body cleaner?
Went through like 30 Q-Tips but I think I got it as clean as I could. Is it okay it's kind of slanted when partially open?
(EDIT Found this thread and looks the same.
https://www.renntech.org/topic/36592...control-valve/
)
This is a source reference. Confirm exact model applicability in the original material.
