Serndipity

First occurrence of not starting, but finally started after engine cooled down and ran OK the rest of day. Threw a CEL indicating CPS (cleared CEL with scanner) and have two questions.

1. From searching the forum, found DIY instructions to replace on the 430, but the CPS on a 320 doesn't seem to be located in the same place?

2. Could this have been a one time event? Wondering if I should have the CPS replaced or wait to see if it happens again?

Thanks in advance for any feedback.

Serndipity

Found the CPS on my CLK320, from pictures a SLK320 (see attached).

Was pretty much the same as a 430.

Didn't see the torx screw however, covered by a plastic cap?

Getting to cold here in the Boston area for DIY, so given that my only out of pocket repair in 80,000 miles has been a quick and simple DIY MAF replacement, after reading more on the ubiquitous CPS failure will check with local dealer and an independent mechanic regarding $ to have it replaced.

cindyclk

If you have room...320 should have a lot more that the 430...it's very easy. There is just one bolt holding it in place on the 430/55. need a #8 torx socket. Get an oem one from autohauz...about $50 http://www.autohausaz.com/search/pro...id=25@Ignition Parts&gid=7196@Crankshaft Position Sensor.

With the 430 or 55, you need a 1/4 drive with a short extension. A regular size socket will not fit securely onto the bolt (the top of the cps does not allow a standard socket to fit)...link below
http://www.marcusfitzhugh.com/CLK/DIY/cps.html

I replaced mine but issue turned out to be bad fuel pump...tested pressure at rail and it was low...replaced w/filter and all ok

ps..I'm near you and it will be snowing soon and real cold Wed.

Serndipity

cindyclk

Thanks for the followup.

Surprisingly, access to the CPS on a 320 doesn't look to be a piece of cake.

If it were warmer, would DIY, but to cold now in my unheated garage.

Dealer in Lynnfield quoted $475 to replace.

Decided to have it done by an independent (X MB) mechanic in Peabody who quoted $275.

cindyclk

Try CNC Autowerks on Highland Ave in Salem (978) 741-0511 ....independent that I've used before w/ good results...give them a call and ask for price. Flagship will suck the life out of your pocket unless you have warranty service. Then you can hang around their fancy waiting room.

Serndipity

Thanks for the info on CNC Autowerks.....they quoted $300 to replace the CPS (said the adaptive engine management had to be reprogrammed when replacing a CPS as well).

Thought about DIY and called the Flagship parts department and they quoted $217.49 for the part. Couple of months ago, they sent me a 'welcome back' 15% discount card, good for for parts and/or service, so it would have cost $197 w/ tax).

Have ordered parts from autohausAZ many times, but by the time the part arrives and DIY in the January cold, I'm more concerned about stalling out in traffic etc..

FYI, I've used Victory Automotive on Route 1 in Peabody, for some work I didn't want to do myself, with good results in the past.

Serndipity

Had the independent mechanic, that sometimes use, replace the CPS this morning.

It was bitter cold here (e.g. 6 degrees F) and the car stalled on the way to the shop at the first traffic light, but restarted before the light turned green.

He had it replaced in under 10 minutes, including checking for STAR diagnostic codes and only charged $136 for the part and labor.

Hint: He used a long extension (maybe 3') between the E8 torx socket and ratchet, thus no scraped hands, aching back.

Tracy12

Hi I changed the cps then car wouldn't still start so brought a petrol pump relay and changed that it cost a fiver and the car runs as sweet as a nut
So maybe try that out first before changing cps

1. From searching the forum, found DIY instructions to replace on the 430, but the CPS on a 320 doesn't seem to be located in the same place?

2. Could this have been a one time event? Wondering if I should have the CPS replaced or wait to see if it happens again?

Thanks in advance for any feedback.[/QUOTE]