20 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHWeak Sounding Intial Engine Start Up
Leading reported evidence
Clean throttle body a while back
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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Discussions that performed work without a confirmed outcome
1
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Performed · outcome unconfirmed
I cleaned my throttle body a while back, but never did this procedure.
Leading evidence: 'Clean throttle body a while back' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check battery' (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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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 performed work without a confirmed outcome
1
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Performed · outcome unconfirmed · Original poster
Previously had dealer check similar situation out under warranty and they replaced the Bank 1 Catalyst (996-113-031-06).
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Discussions that contain suggestions
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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
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Suggestion · Original poster
Previously had dealer check similar situation out under warranty and they replaced the Bank 1 Catalyst (996-113-031-06).
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
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Suggestion
I'm about ready to clean the throttle body as in the refernced post.
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.
20 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.
2 acknowledgements have no verified action link; they do not establish a repair result.
Anyone ever run into a situation where engine start up is weak sounding from a cold start? Once warmed up, subsequent starts sound fine. Wondering if there's a bad sensor somewhere?
Previously had dealer check similar situation out under warranty and they replaced the Bank 1 Catalyst (996-113-031-06). Not having any check engine light or other noticeable mechanical impact.
I think that part number is for the catalytic converter. I looked at Pelican Parts. I have a weak sounding engine startup at cold also. No CEL or any sort of broken mechanical sounds. I wonder if I need new cats???
My car only has 18k miles
Yup. That's the part number for the catalytic converter, but I think the dealership was pre-emptively replacing it rather than having determined that it was defective. Not sure that we need to replace this.
__________________
SpeedPhreak
02 C2 - K&N Aircharger, SSK, Tubi Headers and Exhaust
I'm about ready to clean the throttle body as in the refernced post. Sounds just like the problem I am having. One question......do I need to the the "throttle adaptation" for a 03 996? Cant find anything about "e-gas".
Nice, I love that write up. At first I was a little concerned about the car being difficult to work on (have owned BMW in the past). But am surprisingly happy that this car has been a DIY dream.
Out of curiosity, when you said "turn on the ignition", did you mean to start the car, or just turn the ignition to the pre-start phase? I cleaned my throttle body a while back, but never did this procedure.
Thanks for the compliments on the DIY writeup, guys!
Glad it's helping some people out, eventhough it's a very simple job.
nycebo, it means turn the key to on, no cranking to start.
I'm sure the car's had a chance to adapt by now if you've done it a while.
But you can always do the adaptation procedure anytime, it's kinda like restarting your home computer, I guess?
This DIY worked great! I was initially apprehensive about removing my intake to reach the Throttle Body, but Cosmos' detail was reassuring.
Picked up the cleaner for about $4.18 at Advanced Auto Parts and the cleaning took less than 30 minutes at a leisurely pace. Here are slight modifications for folks with the K&N Aircharger installed:
1. unclamp oil filler (move out of the way)
2. loosen ring clamp for air filter
3. remove air filter
4. disconnect MAF sensor
5. loosen ring clamp holding down the intake tube
6. loosen ring clamp on the throttle body itself
(See photos attached)
Was a little surprised at the butterfly, as it required a little effort to keep it open while cleaning, but the recommended cleaner worked very well.
I also attached before and after shots as well.
Engine is sounding great from a cold start. Awesome DIY. Thanks!
You went all the way removing the intake stopped at the throtle body? It only takes the 4 bolts to remove the throttle body and clean it overall inside and out. I just did it this afternoon as well but I removed the entire throttle body and cleaned it with the spray and a rag, front and back, while off the car.
SpeedPhreak, Glad you fixed the problem! And your local dealership is at least $200 poorer
Arnee, I also didn't remove the throttle body to clean, as I was able to clean the back of the butterfly, as well as inside all the way into the plenum, as it is.
This is a source reference. Confirm exact model applicability in the original material.
