9 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHRPM needle jumping around....
Leading reported evidence
Check fluid and it was low
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
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0
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1
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Leading evidence: 'Check fluid and it was low' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check fluid and it was low' (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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Suggestion
Has anyone ever noticed this tendency or is it time for me to clean the MAF sensor and/or check the plugs?
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
Has anyone ever noticed this tendency or is it time for me to clean the MAF sensor and/or check the plugs?
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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9 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261026T191851Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I have a '99 996 with a tiptronic transmission. When the car's RPM's are around 1800, the needle will jump back and forth up to 2200 and back down to 1800. YOu can feel/hear the engine reving up and down when it does this.
I know I shouldn't be driving the car at that low an RPM but when I am in automatic mode and driving in traffic, I let the car do the work for me. Any thoughts on what might be causing this? It seems to have coincided with the 60K service where it wasn't doing it before I took it in but now it is.
Thanks ahead of time for your help.
I would take the car back to where you got serviced. I suspect the plugs are not torqued tightly and you have a vacuum leak from there causing idle fluctuation.
When warm, my car's idle fluctuates between 650 and 800 rpm in a slow rhythmic manner. Has anyone ever noticed this tendency or is it time for me to clean the MAF sensor and/or check the plugs?
I call this hunting idle.
http://www.renntech.org/forums/index...442&hl=hunting
We did clean out the car on this Box and a 996 at a work on cars day last year.
The tech says that the transmission might be slipping and that is why I see the RPM's reving. He recommends starting with a transmission fluid flush and change. I find this hard to believe. The problem started when I had the 60K service done so it just makes more sense that it would be a vacuum leak or a plug not torqued correctly as indicated in an above post. If the transmission were slipping, why would it only do it at 1800 rpms? Thanks.
Tech spent an hour with the car and there are no codes reading on the computer. He took it for a drive when it was cold and said the transmission was slow and shifted hard. He somehow checked the fluid and it was low. I'll be getting complete transmission fluid flush and refill this week. He says this will fix the problem. It will run me about $350. Any of this make sense?
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