19 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHHunting Idle At Startup, High Idle When Warm
Leading reported evidence
Install soon
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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1
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Performed · outcome unconfirmed · Original poster
Got the same caps you listed and I'll get it installed soon.
Leading evidence: 'Install soon' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check ...i don't wanna $200 myself' (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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1
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Suggestion · Original poster
Just looking for direction on where to start with these, or anywhere else to check...I don't wanna $200 myself to death swapping parts.
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Suggestion · Original poster
Tried clamping it off with some hose-pinch pliers and no change...still hunts
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.
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Suggestion
Put key in ignition and move to RUN position (not start).
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Suggestion
It will not show on a smoke test ( maybe a little smoke from the tiny atmospheric port way back on the engine) but if failing will cause the idle to hunt as it can't control the flow of blow-by to the engine...
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Suggestion
If sealing off/stopping the leak on the resonance shaft doesn't fix the hunting idle, then get a manometer and test the AOS function..Should be 4-6 inwc ..
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.
19 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.
Outcome without a verified action link
Tried clamping it off with some hose-pinch pliers and no change...still hunts
2003 Targa, TIP having some idling issues...
The other day after fully warmed up (80 degree day) RPMs shot up to 2k when putting in park. Blip the throttle and they'd stay at 2k and very, very slowly settle.
On a cold start the next day after the air pump runs, it'll hunt, bouncing around 500-800 RPMs.
Got a CEL and a scan with my VCDS shows "P0456 - EVAP System: Very Small Leak Detected".
From my searching it could be a few things like Fuel Line Vent Valve (no howling from the filler area and no trouble filling up), Electric switchover valve coming off of throttle body, Vacuum Reservoir, Hoses.
Just looking for direction on where to start with these, or anywhere else to check...I don't wanna $200 myself to death swapping parts.
Diagnosis I've done so far:
New gas cap last year, which took care of a P0442 I was having previously...no effect on idle.
Oil cap off...no effect
AC on/off...no effect
Thanks!
Agree, but do an e-gas calibration first. Put key in ignition and move to RUN position (not start). Wait 60 seconds and then turn off ignition. DO NOT TOUCH THE ACCELERATOR PEDAL DURING THIS CYCLE. You should hear some whirring and clicking noises from the engine bay.
Ordered a smoke tester, should be here tomorrow...hopefully it'll find a hose leak and I don't have to go chasing broken valves.
E-gas cal didn't do much, still hunts the idle - makes sense if it's got a vac leak somewhere.
Are you talking about this hose?
Tried clamping it off with some hose-pinch pliers and no change...still hunts
Quick edit: If I grab that hose in question, I can feel the vibration of that valve tapping away
Yeah that�s the hose. You could take hose off valve, plug it with a center punch or something similar and see if valve still taps. Might be valve isn�t staying closed.
Update:
Did the smoke test today and was 98% sure the smoke was coming out of this little port-hole on the rear plenum:
I called my wife out and asked "where's the smoke coming from" She points to that and said "from that little black nipple"
Soooooo, how common is it for that to leak and I'm guessing a new plenum is in order huh?
I didn't see anything else in that area as far as hoses that would/could leak either.
It did build up quite a bit of pressure before smoking and blowing the smoke machine adapter out of the intake into my face...so small leak as the code did say.
Edit: it's the pivot-point for the resonance flap...found a thread where a guy found little caps that fit, so I'm gonna try that for the time being
Find a plastic cap thats larger then the pivot and epoxy it over the stem. There r no parts to fix that seal and its a fix thats has worked well in the past.
If sealing off/stopping the leak on the resonance shaft doesn't fix the hunting idle, then get a manometer and test the AOS function..Should be 4-6 inwc ..
It will not show on a smoke test ( maybe a little smoke from the tiny atmospheric port way back on the engine) but if failing will cause the idle to hunt as it can't control the flow of blow-by to the engine...
Search for a thread that I�ve previously made that gives a solution to this, which is what De Jeeper is describing.
Edit: shame on me for not reading your whole post. It sounds like you found my old thread about this.
