15 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHRough idle then stall
Leading reported evidence
Disconnect battery
Performed · outcome unconfirmed
No successful repair reported for this finding.
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Leading evidence: 'Disconnect battery' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check fiment' (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 · Original poster
When I replaced the oil tube I had to remove a lot of the induction components to get to the fill tube.
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Suggestion
Get mirror or an inspection camera to double check the fiment.
Test smoke preferably or carb/brake cleaner or even soap/water mix
No successful repair reported for this finding.
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Suggestion
I'm not saying that this is the issue but I'm kind of underlying the fact that finding a vacuum leak typically requires some kind of test - smoke preferably or carb/brake cleaner or even soap/water mix.
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15 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261026T181445Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I recently replaced my engine mounts. Sniffing around I notice the oil fill tube was leaking. Stripped everything out and replaced it. Fairly straight forward.
Went to start it and it either idles fine and then dies after ten seconds. Or, spits and sputters and doesn�t start at all.
Few things:-
I disconnected the battery for several days.
There are no warning dash lights.
When I replaced the oil tube I had to remove a lot of the induction components to get to the fill tube. Do the sensors need to be recalibrated?
Any tips would be greatly appreciated thanks
Agreed with the other two. It's possible you missed a vacuum line OR it popped loose, which is very common when you go poking around. Even though you didn't get an MIL you should plug in a scanner and see if there are any pending codes. I bet there are.
Thanks for the replies.
I have reinstalled everything a couple of times and no luck. Only thing I can think of is that the plenum is not seating correctly. looks fine but it�s hard to tell as I cannot see the rear of the connection.
Finding a.vacuum leak can be really difficult without a smoke test - or without using an old trick with carb/brake claener / soap/water mix. Considering that all the vacuum lines are made of plastic and connectors are rubber and - if original - they are now almost 20+ year of age it's possible that they are just so brittle that they can leak even though they are seemingly ok. When I replaced one of those plastic lines it was really hard to touch and bend and when I got a new one it was soft and flexible. You can buy that vacuum line by the length and it's cheap even getting from Porsche directly or online... (about 10-15 (eur/usd) / (1 meter / 3 feet) - part number
00004320501
- then just cut it to a appropriate length using the original.
Those vacuum lines (fixed wording from "tubes"...) are those really thin black plastic lines that goes in multiple places in that engine compartment - easy to find. They kind of hang in the air and it's kind of easy just by accident to hit those and they will detach from the connectors. Now if they haven't been removed ever or for a long time they might work of as they are kind of "glued" together with the "age" but once those are separated and both part (line and connector) are hardened it might be that the connector starts to leak once reinstalled - just a theory
I'm not saying that this is the issue but I'm kind of underlying the fact that finding a vacuum leak typically requires some kind of test - smoke preferably or carb/brake cleaner or even soap/water mix.
I can tell you that I chased a vacuum line after doing work in this area. Turned out to be the 428mm line in Yogibara’s line, popped off at the farthest point (which isn’t visible).
