mikekuriger

Hey everyone! I've been having a problem for about 2 weeks where my 05 C55 stalls when I put it into reverse or drive when cold. (there is no check engine light)
If I start it and let it warm up, it's ok. I've done some searches but have been unable to read up on anyone else having this issue with a C55. I recently replaced the MAF sensor last summer and I have about 95,000 miles on her now. I'm thinking I should change out a sensor but I'm not sure which sensor is bad. I'm hoping it's a temp sensor or something. If it's a bad tranny I'll be sad :-(

Anyway, once the car is warmed up it runs great. The only problem I have is I am replacing rear tires a lot.

I'm in Mesa AZ on vacation for a few days and I'd like to fix this before heading to l.a.

thanks for any help,
Mike Kuriger

Panzerknacker

Vacuum leak after the MAF possibly? Notorious for causing these symptoms on Subarus when it is cold out. They have like 800 miles of boost lines and places to spring a leak.

Have your spark plugs and fuel injectors been replaced anytime during the life of the car?

mikekuriger

I have not replaced either yet.

mikekuriger

i was hoping for something simple like a temp sensor somewhere. on my old car, if the temp sensor went bad the computer wouldn't choke the engine when cold. i looked for vacuum leaks and was unable to find any. car runs like a raped ape when it's warm though.

some maintenance I plan on doing are plugs/wires, and send the injectors to rc engineering for balancing/cleaning. I also want to get the tranny fluid changed and possibly the bands for 2nd gear since those are usually the 1st to wear out.

kjb55

check the intake butterfly (throttle body) after the MAF sensor. Could be gunked up, restricting air and causing a too rich condition when cold.

loudandheard

Will there be any codes even though you don't have a CEL?

Quicktwinturbo

CPS.. change it

mikekuriger

What's the CPS?

Quicktwinturbo

Cam position sensor.. I had similar issues and others as well. Do a lil search and you should find more information

Good luck!

mikekuriger

thanks for the replies. I'll get on this asap.

mikekuriger

i noticed you list green filters in your sig. just wanted to warn you that the green filters are responsible for my destroyed MAF a few months back. they basically fell apart.

Phil C55

If there was enough of a disintegrating air filter that it took out the MAF, some went on through to the throttle body. I'd be checking for crap in the throttle body.

mikekuriger

so am i supposed to change the cam position sensor or crank position sensor? after doing a search, I have found many references to the crank sensor but not the cam sensor. I don't want to change the wrong one! maybe I need to change both just to be safe?

Quicktwinturbo

My apologies.. It's prolly the crank sensor.. Do plug ur car into Star system though.

As for green filter, it happened to me once.. Now I have the upgraded one and so far, so good.. It's been an year already..

ali saklaoui

did you check the transmission fluid?low level when cold,when warm the fluid expanses.

amgfreak87

A friend and I had the same problem a few days ago.

We both drive a C55. His MAF was renewed in February this year, but gave up again.

Mine still had the first MAF. We both got a new one today and the cars rides much smoother.

Before it felt like the gears would slip during acceleration. My car felt better when it was warm, his didn´t.

The reason was that his MAF was striking much more (Check Engine Light), whereas mine was still working to some extent ( no CEL).

Both got covered by the waranty.

Hope that helps!

mikekuriger

I finally got a check engine light, and it indicated a MAF issue. I cleaned the MAF and it's better but still stumbles a bit once in a while when cold. I suspect the maf needs replacing and since it was replaced 6 months ago, it is still covered under warranty. If that fails to fix the problem, I'll get a CPS and change that.

thanks!

amgfreak87

Update: Car still doesnt run how its supposed to run. It´s a little better than it used to be. Guess it was the excitement with the new MAF that made me think its fixed.

CPS ist usually an issue when the car wont start or starves during driving. Do you guys think it could still solve the problem ?

It still feels like the gears a re slipping once in a while. However only if the car is cold!

Help me, please

Elpowell

Has anyone solved the cold stall issue involving the c55

bsuba8

Also experiencing the same problem. During december for a few days and a few days late April when I would start the car there would be a rough idle and after driving for maybe about 2 minutes the engine would turn off; fduring my entire 2 hour commute to LA it would turn off sporadically. However, after being parked in a garage and away from cold/rain car would operate normally.

mikekuriger

wow old thread! the fix is to clean the MAF

Elpowell

A new mad meter was installed just to make sure prior to taking it to the dealer car still stalled.

Elpowell

That should have read maf meter

crniamg

ok i got same problems like you ppl stalls on stop sign . NOW i got car in my shop try to fix the problem scan for code and got one for air mass sensor replace that and test drive same crap only did that on low gas on full thank no problems take the fuel pump out and WHAT bad connection on pump replace that got some k&n air filters and test drive car run like new now

mrobinso

Honestly?