WANTED M119 MAF

[bimmer2benz]

Running into some intermittent misfire and idle problems with my 94 E500, code reader determined a fault with the MAF. Anybody have or know someone with a functioning unit they are willing to part with? Would greatly appreciate any help. Located in Seattle.

 

[jhodg5ck]

I got a few

 

[gsxr]

Make SURE it's the MAF at fault... if you clear the code, does the same code return quickly? What pin / what code?

Bad MAF should not cause misfiring, btw...

 

[bimmer2benz]

Good point, will check this ASAP before buying a maf

 

[bimmer2benz]

This is a video I took before dropping it off at Schmitt Automotive. Just filled it at Costco and was driving home, out of the blue the car starts hiccuping/misfiring on the road so I pull over. Started the car again and I get this, it continues until the car stalls. Waited about 15min and the car started and drove fine... Possibly wiring harness if not the MAF?

I'll know more about the codes come Monday...

 

[jhodg5ck]

That could be moisture in your distributor caps coupled with a bit of contact burn.

Have a 5mm hex and a small screw driver? I'd start there.

 

[bimmer2benz]

My first thought was distributor caps as well, but when I mentioned it to Schmitt they said they had inspected the caps during a valve cover gasket/cam oiler service I had them do a few weeks ago. No harm in double checking!

 

[jhodg5ck]

Been getting cooler at night there? Moisture in the caps....

 

[gsxr]

This is a video I took before dropping it off at Schmitt Automotive. Just filled it at Costco and was driving home, out of the blue the car starts hiccuping/misfiring on the road so I pull over. Started the car again and I get this, it continues until the car stalls. Waited about 15min and the car started and drove fine... Possibly wiring harness if not the MAF?

That is classic symptoms of secondary ignition problems. Search the forum, this has been discussed ad nauseum. You can't just check the caps and say "they look good". Lots more to this story.

I'll know more about the codes come Monday...

There won't be codes. This misfire doesn't cause fault codes to be stored. What you CAN do is view live data from HHT-Win while the misfire is occurring, to see which specific cylinders are affected, which will tell you if they are all related to the same distributor cap or not.

 

[bimmer2benz]

Seems that the MAF is reading inaccurately at 3.6kg/h and that this code that keeps coming up.

 

[TerryA]

What’s that note about the CAT overheating? I think that’s a bigger problem at the moment.

 

[jhodg5ck]

Your harnesses all good?

Overheating cat is a new one for meeeee!

 

[gsxr]

If the MAF is reading 3.6 kg/hr with the engine running, yeah, that ain't right - assuming the harness is good. Idle should be ~20kg and it should increase from there.

Code 15 is "not used" for USA models. Looks like a Japan-spec error code, Japan had a catalyst heat sensor to trigger an "EXH TEMP" warning light in the cluster.

 

[jhodg5ck]

If the MAF is reading 3.6 kg/hr with the engine running, yeah, that ain't right - assuming the harness is good. Idle should be ~20kg and it should increase from there.

Code 15 is "not used" for USA models. Looks like a Japan-spec error code, Japan had a catalyst heat sensor to trigger an "EXH TEMP" warning light in the cluster.

Ahhhh, jap car. That makes a Lot more sense! That sensor loves to break...

 

[gsxr]

OH, yes, you are correct... this is indeed a Japan-spec car!

SOLD - 1994 E500, Silver/Black, 85kkm, Japan-spec, BaT Auction (West Fort Lee, NJ) | Cars for Sale - 500E / E500 ONLY

Seller needs a new detailer... VIN = WDB1240361C080448 https://bringatrailer.com/listing/1994-mercedes-benz-e500-32/ Datacard: https://www.lastvin.com/vin/41My62YM0z32ve9Ng This 1994 Mercedes-Benz E500 is a European-specification example that was sold new in Japan before being brought to...

www.500eboard.co

 

[bimmer2benz]

Sorry for the confusion! Yes this is a Japanese car so it has this temp sensor which seems to be broken.

 

[bimmer2benz]

Wiring harness is a new delphi unit...
@jhodg5ck , I've PMd you about buying a MAF. I'm thinking next steps are to replace the MAF and look at secondary ignition if the problem persists.

 

[TerryA]

OH, yes, you are correct... this is indeed a Japan-spec car!

SOLD - 1994 E500, Silver/Black, 85kkm, Japan-spec, BaT Auction (West Fort Lee, NJ) | Cars for Sale - 500E / E500 ONLY

Seller needs a new detailer... VIN = WDB1240361C080448 https://bringatrailer.com/listing/1994-mercedes-benz-e500-32/ Datacard: https://www.lastvin.com/vin/41My62YM0z32ve9Ng This 1994 Mercedes-Benz E500 is a European-specification example that was sold new in Japan before being brought to...

www.500eboard.co

Pic 4 of 99 shows the temp sensor in the side of the left CAT. So that’s where the note 15 overheated CAT is coming from.

This car has only about 53K miles on it. Soooooo, what if it’s still working?