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  #1  
Old 08-29-2003, 07:06 PM
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Join Date: Apr 2000
Location: Falls Church, VA
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See the recent "Idle Control Valve" post.

Now there are three of us with the same problem.

The '87's don't store codes, but you can connect a dwell meter or DMM with a duty cycle to pin 3 of the diagnostic socket and see what dwell or duty cycle reading you get. I can then look it up for you in the manual.
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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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  #2  
Old 08-29-2003, 07:13 PM
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Trouble code reader for 103 engine

Greetings Forum Members,

I have a 1987 190e 2.6 with the typical leaky head gasket and non working ac unit.
For my purposes I can live with these issues.
Recently the engine has begun to run rough, surge at idle and stall with difficult restart(pedal to floor while cranking engine to restart).
Do any of these symptoms sound familiar?
Any suggestions for an affordable trouble code devise I could purchase to diagnose my problem(s)?

Thanks,

Knarf
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72 350SL #69
73 450SL Parts Car?
78 450sl Parts Car
79 450SLC - Sold
1985 280sl
87 190E 2.6 - Donated
90 300E-Junked
97 E420
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  #3  
Old 08-29-2003, 08:24 PM
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Join Date: Jan 2002
Posts: 177
Chuck,

Thanks for the reply.
I assume that I check the reading with the engine running since no codes are stored.
I'll take a reading this weekend and post the results.
I just replace the idle control valve 2 years ago.




Knarf
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72 350SL #69
73 450SL Parts Car?
78 450sl Parts Car
79 450SLC - Sold
1985 280sl
87 190E 2.6 - Donated
90 300E-Junked
97 E420

Last edited by knarf; 08-29-2003 at 10:20 PM.
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  #4  
Old 08-31-2003, 06:08 AM
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Location: Ottawa, Canada
Posts: 126
You may have a bad ignition coil. I had a similiar problem few weeks ago and replacing the ignition coil got rid of it. (I bought a used one for about $35).
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'88 Benz 420 SEL
'79 Porsche 911SC ('87 Carrera Engine)
'00 BMW 540 Sports Package
'99 Land Rover Discovery

86 300E - Manual (sold)
88 260E (sold)
84 944 (sold)
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  #5  
Old 08-31-2003, 09:08 PM
MARIO FARIAS's Avatar
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Join Date: Jul 2003
Location: PUERTO LA CRUZ, VENEZUELA
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ZORIN

pLEASE Sir. tell me how to test the ignition coil in my 190 E, 2.6L, 1988.
What are the simtoms when it fails?

Thanks.


MARIO FARIAS
laprefar@cantv.net
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  #6  
Old 09-03-2003, 12:48 PM
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Location: westchester, ny
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OVP test

Chuck,
Tested OVP at pin #3- it read 6.2mA. What's the verdict (the fuse is good)? Thanks.
Rich
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  #7  
Old 09-03-2003, 05:06 PM
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Mario:

The symptoms I exprienced due to a bad ignition coil was: hard start and stalling at low RPM.
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Zorin

'88 Benz 420 SEL
'79 Porsche 911SC ('87 Carrera Engine)
'00 BMW 540 Sports Package
'99 Land Rover Discovery

86 300E - Manual (sold)
88 260E (sold)
84 944 (sold)
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  #8  
Old 09-03-2003, 09:10 PM
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Join Date: Apr 2000
Location: Falls Church, VA
Posts: 5,316
You need to test the DWELL or duty cycle at Pin 3.

But voltage works as a proxy. Check your battery voltage at idle and then convert your reading to a percent of that. Is it fluctating or constant? It should fluctuate slightly around 45-50% of your battery voltage.
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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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