99 S420 Skips Heart Beat @ 70mph - Page 2 - Mercedes-Benz Forum
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post #11 of 14 (permalink) Old 03-21-2018, 10:35 AM
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Date registered: Jun 2005
Vehicle: 86 190E 2.3L 16V, 2 95 320TE's, 02 S500
Location: Seminole, FL
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Get some maf cleaner Al. It is a specific spray on product.

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post #12 of 14 (permalink) Old 03-27-2018, 09:12 PM Thread Starter
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Mechanic In A Can

Knock on burlwood, I think cleaning the MAF did the trick.
A $9 can of cleaner, a 25 mile test drive, and no more hiccups.

The dealer wanted $44 each for air filters, mine didn't look too bad, so I passed on that. The MAF didn't look dirty at all, and the throttle body was spotless. I suppose that MAF is just super sensitive to contamination.

I sprayed the MAF liberally, waited 30-40 minutes, and set out for a trial. Zero symptoms.

Thanks to everyone who offered advise, googling MAF failure symptoms drew the same conclusions, BTW.

If you choose to try this yourself be aware that:
I did lose a 7mm open end/box end that slid under the intake manifold while I tried to loosen the clamp under the MAF.
And then the MAF would rotate, but I couldn't remove it. I just sprayed it in place and slapped it all back together. It was very awkward leaning over that huge engine working in tight spaces.
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"You are what you drive!" Big Al

There is perception, and then there is reality.

'99 W140 S420 111K, '94 W124 E320 124K (sold! Repurchased 10/3/16, sold 11/17)
'14 BMW X3 XDrive 38K,
'13 BMW X1 28K (Traded). '11 BMW 328i XDrive 19K(Traded)
'08 Subaru Outback Limited Wagon 56k (Traded)
'83 BMW 320is "Sport" (48k, sold! converted to EV!)
'87 190E W201 (sold!) '85 Audi 5000 (sold!)
'76 250 W114 (sold!) '72 280 W114 (sold!)
'67 200D W110 (bartered) '62 220 W111 (buried)
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post #13 of 14 (permalink) Old 03-28-2018, 03:59 AM
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Date registered: Jun 2005
Vehicle: 86 190E 2.3L 16V, 2 95 320TE's, 02 S500
Location: Seminole, FL
Posts: 12,493
Mentioned: 10 Post(s)
Quoted: 1089 Post(s)
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Quote:
Originally Posted by LogicalPosition View Post
Knock on burlwood, I think cleaning the MAF did the trick.
A $9 can of cleaner, a 25 mile test drive, and no more hiccups.

The dealer wanted $44 each for air filters, mine didn't look too bad, so I passed on that. The MAF didn't look dirty at all, and the throttle body was spotless. I suppose that MAF is just super sensitive to contamination.

I sprayed the MAF liberally, waited 30-40 minutes, and set out for a trial. Zero symptoms.

Thanks to everyone who offered advise, googling MAF failure symptoms drew the same conclusions, BTW.

If you choose to try this yourself be aware that:
I did lose a 7mm open end/box end that slid under the intake manifold while I tried to loosen the clamp under the MAF.
And then the MAF would rotate, but I couldn't remove it. I just sprayed it in place and slapped it all back together. It was very awkward leaning over that huge engine working in tight spaces.
Al

What codes showed up when you had them pulled?

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post #14 of 14 (permalink) Old 03-28-2018, 05:05 AM Thread Starter
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Date registered: Nov 2013
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Code For MAF Failure

Quote:
Originally Posted by Jayare View Post
Al

What codes showed up when you had them pulled?

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I went out to drive the vehicle to an auto parts store the next day and the CEL disappeared the moment the engine started. When I got to the store the fella said he couldn't read the codes if the CEL was off, and he couldn't pull history of codes, nor could he reset codes.

When I arrived back home, HUM had sent me an email advising me that the vehicle had tripped a P0100 code and offered several suggestions and an explanation about the code.

I drove the car several miles that day, and sure enough it was hiccuping about every 3-4 miles of city driving. It didn't stall or trigger a CEL.

No guarantees I'm outta the woods with the cleaning solution, there may be a catastrophic failure looming down the road, but so far it appears the problem is solved. At least I'll recognize the symptom should it reappear.


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"You are what you drive!" Big Al

There is perception, and then there is reality.

'99 W140 S420 111K, '94 W124 E320 124K (sold! Repurchased 10/3/16, sold 11/17)
'14 BMW X3 XDrive 38K,
'13 BMW X1 28K (Traded). '11 BMW 328i XDrive 19K(Traded)
'08 Subaru Outback Limited Wagon 56k (Traded)
'83 BMW 320is "Sport" (48k, sold! converted to EV!)
'87 190E W201 (sold!) '85 Audi 5000 (sold!)
'76 250 W114 (sold!) '72 280 W114 (sold!)
'67 200D W110 (bartered) '62 220 W111 (buried)
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