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  #1  
Old 05-14-2009, 02:17 PM
land sea air's Avatar
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Exclamation 500SE stumbles/misses heavily at 1500-2000 RPM

Hello all, 86 500SE euro. I have had this problem since I bought the car, between 1500 and 2000 RPM under light to moderate load the car misses heavily with popping from the exhaust. Under heavier loads (not necessarily full acceleration) it runs great but unfortunately 2k rpm is where the car wants to run at highway speeds (55-65mph) so often times I have to leave the car in 3rd gear to alleviate the problem or speed more than I'm comfortable. This is one of the only things keeping me from fully enjoying the car so any help would be much appreciated!

cap and rotor are not new (I have ordered them in the hope that that was the problem) but they look perfectly fine.
replaced plugs and wires last year which didn't fix the problem.
the car has EZL ECE for adjusting timing for different fuel types, I run 93 in the car but having the resistor set for 89 or 87 seems to lessen the problem which makes me think it's ignition related rather than fuel.

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  #2  
Old 05-14-2009, 06:02 PM
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Hmmm...... Are you saying that it runs rough between 1500-2000, but it runs ok when above 2K?
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1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
1988 560SEL "Gunther"- 190K passes anything except a gas station
1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition
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  #3  
Old 05-14-2009, 07:50 PM
land sea air's Avatar
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basically, maybe a little higher than 2k and a little lower than 1500 but that's the general range
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  #4  
Old 05-15-2009, 08:24 PM
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How many miles? Any work done to the exhaust system? My initial thought is cat converter or precats plugging up, but I could be way off. Just a hunch.

I could also see a flaky crank position sensor doing things like that.... Especially if tweaking the timing resistor seems to help.

Make sure you are using the correct non-resistor type plugs and not platinums...

Other than that, without more info I'm kinda lost...
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1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
1988 560SEL "Gunther"- 190K passes anything except a gas station
1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition
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  #5  
Old 05-15-2009, 09:54 PM
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I believe it has the correct plugs- right?
It has the tri-y manifolds with precats in the down pipes and no main cats.

may want to try loosening the down pipes from the headers and see if it still does it.

I was thinking about the crank sensor as well...
Swapped coils, same thing, swapped EZL's (with a 560) same thing.
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1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350
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  #6  
Old 05-15-2009, 10:00 PM
land sea air's Avatar
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Car has 250k

I don't think it's exhaust related since it all looks to be in pretty good shape. Also fairly certain the car doesn't have cats but perhaps Johnhef could shed some more light on the topic (forwards thread).

Where is the crank sensor located on M117? How would I test this?

When I replaced the plugs I used non-resistors so I doubt that's the problem.
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  #7  
Old 05-15-2009, 11:04 PM
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Man, I'm all out of guesses. I'd have to see the car to have any chance of getting this one.....

I'll leave this to the more experienced contributers here.....

My only remaining guess is a slopped out timing chain...... Ever had it replaced?
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1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
1988 560SEL "Gunther"- 190K passes anything except a gas station
1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition
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  #8  
Old 05-15-2009, 11:16 PM
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hasn't been replaced but timing is correct if I remember from John hitting it with the light.
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  #9  
Old 05-16-2009, 12:29 AM
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no the exhaust could still be a problem, its a halfassed attempt at federalizing with precats welded in, and cramped at that. iirc one of the cats is laying against the block or p/s box or something.
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1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350
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  #10  
Old 05-16-2009, 08:44 AM
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Yikes, does it have original chain guides as well? If so I'd be replacing all of that ASAP....thats an every 100k job!
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  #11  
Old 05-16-2009, 05:32 PM
land sea air's Avatar
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Quote:
Originally Posted by pawoSD View Post
Yikes, does it have original chain guides as well? If so I'd be replacing all of that ASAP....thats an every 100k job!
can that cause the miss?
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  #12  
Old 05-16-2009, 07:10 PM
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no
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1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350
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  #13  
Old 05-16-2009, 09:30 PM
land sea air's Avatar
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well understandably it's now on my to do list.
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124.030-Greyhound (sold)
124.030-Schnauzer (sold)


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  #14  
Old 05-21-2009, 08:22 AM
land sea air's Avatar
HAHA THAT'S WHAT SHE SAID
 
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UPDATE:

I installed a new cap and rotor to no avail.

how can I check the crank position sensor and where does it plug in? (at both ends)
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123.130 with 616-Frankenbenz (sold)
124.030-Greyhound (sold)
124.030-Schnauzer (sold)


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  #15  
Old 05-21-2009, 07:57 PM
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left rear of the engine at the bellhousing, other end is the green wire into the EZL.

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1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350
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