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  #31  
Old 12-08-2006, 10:15 AM
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Join Date: Dec 2002
Location: ohio
Posts: 297
Did you replace the motor mounts? Maybe you are feeling the engine jump around and mistaking it for something else. It was the case in my daughters 300CE. We couldnt believe the change it made.

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  #32  
Old 12-08-2006, 11:03 AM
Bigpete123's Avatar
300ce
 
Join Date: May 2005
Location: Seattle
Posts: 130
Thanks for your reply, Mike. I forgot to put those on my list- I replaced the motor mounts about a year ago. Yeah, they made a great difference! Unfortunately the car misses hard enough that even the new motor mounts can't absorb it...
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  #33  
Old 12-08-2006, 11:07 AM
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Location: ohio
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try something so simple...replace the plugs again....be sure to use only Bosch coppers...hard to get, you know.
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  #34  
Old 12-08-2006, 11:36 AM
david s poole
 
Join Date: Mar 2005
Location: dallas
Posts: 1,822
by the description you gave this sounds like an electrical miss.pull out your ovp relay and check the female pins.the small pin should be labeled 15 and often moves down in the plug socket maklng intermittent contact usually after everything has heated up.check all the other pins in that socket too and look for evidence of corrosion.it is close to battery and fumes from acid can easily get back there.
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  #35  
Old 12-08-2006, 12:15 PM
Bigpete123's Avatar
300ce
 
Join Date: May 2005
Location: Seattle
Posts: 130
Thanks very much for your replies guys. I seriously just replaced the plugs like 100 miles ago. Maybe less. And the previous plugs had only been on the car for like 10,000 miles, but my mechanic replaced them because he said they were shot due to another mechanic adjusting the mixture incorrectly.

I replaced the OVP maybe 150 miles ago. But I suppose corrosion could be occuring in the part that the OVP plugs into (?).

I've been doing more searching, and lots of people seem to have trouble with their ignition coils. If I recall correctly, I only had one of my ignition coils replaced. So it could be the other two also. Some people have also talked about some kind of resistor boot on the ignition coils. I'm not a mechanic, but I'm trying to fix anything I can myself so that I don't have to spend much more money...

Can somebody tell me where the ignition coils are located? I need to find a dark parking lot somewhere (hard to find in the city!) and see if I can find any arcing. Apparently there was obvious arcing with the coil pack that WAS replaced already.
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  #36  
Old 12-08-2006, 01:03 PM
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Join Date: Aug 2006
Location: NW OKlahoma
Posts: 410
Hey BigPete. Different car but possibly helpful. I chased a similar problem with my 1990 300E for a while. It only missed when very warmed up and the miss sounded like yours. (Sounds like your old cold start problem and your new warm idle problem could be two different issues?) Mine was a problem with the distributor cap and rotor arcing internally. I know yours is fairly new but mine only had about 10K on it and the whole problem was with how I installed it. Check out the thread. I don't know how to post it but it's titled 300E hot misfire and the last post would have been 12/5.
Hope this helps.
Chuck.
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  #37  
Old 12-08-2006, 01:06 PM
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Location: NW OKlahoma
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Correction. "300E misfire when hot" posted last on 12/06.
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  #38  
Old 12-08-2006, 02:02 PM
Bigpete123's Avatar
300ce
 
Join Date: May 2005
Location: Seattle
Posts: 130
interesting. I definitely need to check for arching. I wonder why something like that would only happen when the car is hot though. That just seems weird.
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  #39  
Old 12-08-2006, 03:01 PM
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Join Date: Aug 2006
Location: NW OKlahoma
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I wonder myself. It was a minor miracle the thing even started at all. But it did and ran great until good and warmed up. I didn't want to believe that it could be distributor related mainly because the symptoms didn't quite fit. It sure didn't behave like anything I have ever worked on before.
Chuck.
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  #40  
Old 12-10-2006, 10:59 PM
Bigpete123's Avatar
300ce
 
Join Date: May 2005
Location: Seattle
Posts: 130
Just a quick follow-up. I didn't have time to work on my car this weekend, but I definitely had time to drive it. The symptoms haven't come back since the initial test drive... Is it possible that the part just needed a little while to adjust? Maybe that's a really dumb question, but could electronic things just kind of figure themselves out when you add a new component like this?

The car is driving as good as ever (except I need a rebuilt transmission)!
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  #41  
Old 12-11-2006, 10:41 AM
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Location: Kankakee,IL
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Woo hoo!!! Now post up on Bnzsport so I have something to read!!! lol

Chris
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  #42  
Old 12-11-2006, 11:09 AM
Bigpete123's Avatar
300ce
 
Join Date: May 2005
Location: Seattle
Posts: 130
Seriously, Chris. What happened to that forum? Over the course of a few weeks it just died! I wouldn't be surprised if AJ stopped paying for the server space soon!

I will be posting another small update to my car stereo installation thread tonight (if I don't forget). So that should give you something to look at over there!

Back on topic, one thing I should mention is that I'm running a bottle of Techron right now. Maybe that's helping. I'm not keeping my hopes too high that I've solved my issues... this car has a way of running nicely for a few hundred miles and then just going back to its old ways. But maybe I'll be lucky!! Although over $9k in maintenance over 3 years isn't exactly "lucky"!!!
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  #43  
Old 12-11-2006, 11:21 AM
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Join Date: Feb 2002
Posts: 1,599
Pete,

One fellow CPA to another..
My 88 ce had a similar hiccup. About 4 years ago I had the dealer look at it. They swapped out the fuel distributor from a yard 190e 2.6. (same part I was told). Told me the problem was fixed but I would need a fuel distributor. (gasp!). I never got it and the swapped out part is still under the hood.

Same twitch is still there. Just my $.02, but the incremental cost involved in acheiving 100% "smoothness" as opposed to 98.5% isn't worth it, so long as the condition remains stable, four years and forty thousand miles later.
But I concede, I'm not a DIYer. Dealer or indy MB work only for this car. I'm still naive enough to believe that dealer service (& history) history will add something to the performance as well as to resale value somewhere in the future.
All I want to do is get in and go and turn heads.
(Garnet with parchment/bone interior. About to turn 90,000.)

PS: Have you visited the Open Discussion forum and signed on the 300ce roll call yet?
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  #44  
Old 12-11-2006, 11:31 AM
Bigpete123's Avatar
300ce
 
Join Date: May 2005
Location: Seattle
Posts: 130
No, I haven't seen that thread. I'll go take a look!

I hear you. I'm sure you can understand that I'm a really anal person, given that we both work with anal people all day! ha ha... There definitely will be a point where I will have to concede to the fact that my car is about 17 years old with 192k on the clock... That it's an old car, and that most old cars are in the junkyard at this age...

But part of me worries that as soon as I truly embrace that mindset, I will allow my car to deteriorate... and this car just has so much potential. It's gorgeous, I've put a ton of my time, effort, and money into my car stereo installation (which is in perpetual progress) as well as other modifications, and I don't want to "let go". ha ha, this is so dramatic.

My wife certainly doesn't understand, but she's on board with spending the money to rebuild the tranny. So that's nice. She definitely doesn't understand why I curse under my breath everytime we're sitting at a stop light and the car hiccups. She doesn't think it's a big deal, but she drives a 1990 Jeep Wrangler (i.e. death trap! we're selling that thing ASAP!).

Anyway, I would like to thank everybody for their input and for listening to my rambling. This forum is so helpful!!

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