'97 C230, CEL Code P1747: Urgent? - PeachParts Mercedes-Benz Forum

300B · #1 06-19-2007, 04:36 PM

Quote:

Originally Posted by Benzadmiral

The C230 has been behaving fine the last ten days or so. It stuck, then slammed into gear the day after the dealer visit, but has been fine since then (!)

The advice I've gotten from two independent shops here, one being the guy I've gone to for more than five years, is just what the dealer said: Until they can reproduce the problem, they can't be *sure* replacing the controller would fix it.

300B: If it's the MAF, wouldn't there be other driveability problems, poor gas mileage, etc.? My mileage is tip-top.

In the meantime, I'm having the shifter bushing(s) replaced to solve a nasty rattling I've been hearing in the cabin on ripple-bump roads. Seems to me I saw a post here that suggested that, just possibly, if the shifter isn't making the right contacts, the transmission could get confused and not know what gear to go into. Maybe that'll help, or even solve, the issue?

Daveuz, I don't know the board rules about posting the names of shops outside the Good Shops section. Have a look there; I've posted the contact info for my regular mechanic. Or you can PM me.

My driveablilty and MPG's were good and I didn't have a code however my AMM was bad(finally got the dreaded P0170 and P0173).

A new Maf cured a sometimes hesitant and slighty confused 722.6 in my C280.

Benzadmiral · #2 06-19-2007, 05:04 PM

Quote:

Originally Posted by 300B

My driveablilty and MPG's were good and I didn't have a code however my AMM was bad(finally got the dreaded P0170 and P0173).

A new Maf cured a sometimes hesitant and slighty confused 722.6 in my C280.

Thanks for the tip, 300B. Without codes for it, however, is there any way to test to see if the AMM is bad? That's a $300-$400 part, even from here on Fastlane, and I'd like to be sure before spending. Or could I just clean up the wires?

300B · #3 06-20-2007, 02:17 PM

Quote:

Originally Posted by Benzadmiral

Thanks for the tip, 300B. Without codes for it, however, is there any way to test to see if the AMM is bad? That's a $300-$400 part, even from here on Fastlane, and I'd like to be sure before spending. Or could I just clean up the wires?

Seen it for less,much less.

Could help alot.

Benzadmiral · #4 06-20-2007, 03:36 PM

I've been doing a little 'net research, and have found Bosch units for as low as $242.99 at All OEM Parts.com. Was Bosch the OEM supplier?

BenzOnline · #5 06-20-2007, 03:49 PM

Are you driving it in S or W mode? I noticed sloppier, improper shifts in S mode than in W mode so I leave it in W at all times. Smooth as a button and the transmission is getting more torque.

Will_w202 · #6 06-20-2007, 10:32 PM

Do you have any slop/play whatsoever in your shifter when it's in "D?" Next time it's in gear, try to move it in millimeter increments toward "P" and "3," not actually clicking it into the next position, but seeing if it will move out of the "d" position and NOT pop back where it is suppose to be. Mine was doing this for a while and after the shop spent $1500 of MBUSA's money, they figured out a 3 cent screw holding the linkage to the transmission was causing jerky shifts and slippage.

Benzadmiral · #7 06-21-2007, 09:27 AM

BenzOnline,

I've always used S mode, so the car starts in first gear from a light. With the A/C on, I find it helps the little 4-cylinder's acceleration. The W mode is fine . . . once the transmission is out of that warmup mode where it delays shifts for a minute or so in order to improve emissions. About two years ago I accidentally set it to W, and the car acted so weird I thought the transmission was going out. But once I'm past the warmup period, you're right, it is smoother, and I guess would bypass any problem with shifts from 1 to 2, because the tranny would bypass 1 entirely.

Will_w202,
Yes, there is a small amount of play, enough to rattle on ripply surfaces. The sound seems to vanish when I drive with the selector snicked over to 4: no play. I'm having those bushings replaced today, and will report.