Hi all,
Here is another brain teaser for you guys. Its got me scratching my head.
My CE light came on a few weeks ago and I pulled the codes for MAF. Well I ordered a new MAF but I just wanted to try to clean the old one with the CRC cleaner. I cleaned the hell out of it and guess what? the CE light went off.
Now however, the CE light will come on sometimes and will stay for days until I drive the HELL out of the car basically redlining it a few times on take offs. The next time I start the car afterwards the CE light will be gone for days and then I will take it very easy and then it will go on again until I drive the hell out of it again. When the light is out I can't pull any codes as there are no codes saved. I guess next time I need to have the codes read right when my CE light is on. What would cause this symptom? I will definitely change my MAF but this is weird. My car runs flawlessly. HMMMMMM

Hey Designo,

Just curious, did you use regular CRC cleaner, or the one specifically for MAF's?

Thanks,

Dave

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1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible

The one specifically for the MAFs.

Designo,

Did you remove the sensor from the canister/tower and then spray it? Or spray it in place?

Bob

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Bob Jones
Bradenton, FL
'87 560SL-Sold
'99 SL500 For Now

Removed it. Does this mean that the sensor is only Half cleaned? I do have a new sensor also but I would like to keep it until this sensor is really shot to hell. My gas mileage is awesome and the car runs flawless. I am however thinking about taking the MAF sensor out again to spray it and also AGITATING it with a VERY soft brush that won't leave a resifue. If I break it then I have a brand new spare one.
What are the reasons for my symptoms?

people have always told me, just to spray the MAF, never touch it with anything.

also.... when was the last time to o2 sensor was replaced? that could be causing you CEL to come on.

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1989 300ce 129k
( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone)

1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus

1994 e320 Cabriolet 108k



1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it


[/SIGPIC]

Designo,
Removing the sensor, IMO, is correct and corresponds to the directions on the can of MAF cleaner. I agree with the other comment about not touching the filament with anything. There's really no need.

When I did mine a couple thousand miles ago, after the system self adjusted or re-educated itself via the now clean sensor, my engine, like yours, has been running very smooth. If this is 'temporary', then I'll look forward to re-cleaning perhaps a couple times a year given the mileage I drive. To me, as long as the filaments are intact, I'm comfortable extending the life of the sensor thru cleaning.

As to your other symptoms, there are quite a few others in this thread/forum much smarter than me that will have to comment.

Glad this worked out for you.

Bob

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Bob Jones
Bradenton, FL
'87 560SL-Sold
'99 SL500 For Now