12 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHCRC MAF cleaner really works
Leading reported evidence
Clean maf wire like porschetech suggests, and all was right
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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Read evidence and context
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Performed · outcome unconfirmed
Cleaned the MAF wire like Porschetech suggests, and all was right with the world.
Leading evidence: 'Clean maf wire like porschetech suggests, and all was right' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Clean maf sensor every 4 years or so' (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 · Original poster
I think it is a good idea to use CRC to clean the MAF sensor every 4 years or so !!
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Suggestion
Nice PSA, I have had mixed results either no change or a little change for the better.
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 · Original poster
After running for 5-10 min the car was running beautifully and fuel trims were coming back toward ideal.
Run beautifully and fuel trims were coming back toward ideal
Suggestion or failed attempt
No successful repair reported for this finding.
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Unsuccessful attempts
1
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Read evidence and context
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 · Original poster
After running for 5-10 min the car was running beautifully and fuel trims were coming back toward ideal.
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.
12 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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1 acknowledgements have no verified action link; they do not establish a repair result.
Outcome without a verified action link
Nice PSA, I have had mixed results either no change or a little change for the better.
Just some technical FYI on the MAF sensors for 996 fitments and procedures.
There are 3 different MAF sensors for 996 cars... 996 606 "123" 00 for 98-99 , "124" for 2000-01 and " 125" for 02-up....Same for 986 cars.
The 123 and 124 are more susceptible to dirt fouling than the later 125 flavor. Interestingly enough, Porsche had a TSB for the 986 cars to go from the 124 MAF to the newer 125 MAF and a reprogram of the DME to match, but no such thing for the 996 cars.
With the cost ranging up to $955 for a Genuine Porsche 124 MAF, it is quite the costly repair. if you go Genuine Porsche.
I have been watching my fuel trims for years as I frequently drive with Bluetooth OBDII and Torque Pro on my Smart Phone dash mount and monitor all the OBD Data.
I have seen my fuel trims going slightly more off over the years and are were getting close to setting a CEL for fuel trim near idle
.
. Under full throttle fuel trims were good, just near idle they were getting further and further from ideal.
I decided to try the CRC MAF cleaner. I have seen many many products that do not do what they claim and are nothing more than "snake oil". But this product lives up to its claims.
After buying a can, removing the MAF (two screws), 15 quick shots of the cleaner as directions, let dry for 30 min. Started the car AND IT RAN TERRIBLE as expected if anything had changed !! After running for 5-10 min the car was running beautifully and fuel trims were coming back toward ideal. After a 30 min drive the fuel trims were now PERFECT. I have replaced many many MAF sensors in the past, and I believe the overwhelming majority of them were just dirt fouled.
123-124 style , notice the end, very susceptible to dirt
125 style, not as susceptible to dirt
I think it is a good idea to use CRC to clean the MAF sensor every 4 years or so !!
I have several, the ELM327, the Viecar, and the OBDlink MX. they all work with Torque Pro and Android and give the same data (whatever is output from the DME protocol)..
The OBDlink MX is the best (and most expensive) but I use it all the time, it can be left plugged in and won't drain the battery. Automatically turn on and off. The cheaper ones have to be unplugged each time.
I have been debating between the Johnsen�s 4721 for $6.71 on AMZN and the CRC for $11.15. I have both in my cart. Seemed like quite a $ difference but as an avid reader of your posts, I will go ahead with the CRC. Getting the CRC throttle body cleaner at the same time. My only symptom is a little bounce at idle when cold. But I figured it was a good thing to do.
Thanks.
Yes, the "hot film" gets dirty. Very similar to the "hot wire" sensor types.
This short video has a good animation of the air flow through the Bosch "hot film" MAF..
You Tube
Nice PSA, I have had mixed results either no change or a little change for the better. Typically the early cars with the MAF as you suggested. Wonder what makes the early ones more susceptible to dirt and fouling?
The dirt on the "hot film" effects the sensitivity more at very low velocity (near idle).
The 123 and 124 MAFs get just as dirty as the 125 MAFs, but the 125 MAF has a redesigned air flow through the sensor to increase velocity. and re-calibrated to a higher range so the the decreased sensitivity at low velocity has a lesser effect.
This is a source reference. Confirm exact model applicability in the original material.
