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  #16  
Old 08-07-2003, 11:33 AM
Mike Murrell's Avatar
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Mike69:

If your car has a 1989 M103 engine, a good independent should be able to resolve the problem without OBD equipment. This comment is not intended as a slur against MB dealers.

I may stand corrected, but I do not believe OBD was around in 1989, at least not on the '89 M103.

An ignition scope could be used to check ignition.

Steve Brotherton's article on engine mgt. is also quite useful.
One needs TWO multimeters. One to test EHA current and one for the X11 diagnostic port. You'll want to use a multimeter with duty cycle capabilities for the X11 port. The EHA current test may be done with a std. no-frills multimeter; however, it must be able to read milliamp.

By the way, the EHA test harness that was $20 a few months ago is now close to $40.
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1991 300-SEL - Model 126
M103 - SOHC
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Last edited by Mike Murrell; 08-07-2003 at 12:21 PM.
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  #17  
Old 08-07-2003, 04:31 PM
mike690003's Avatar
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Location: Miami,FL
Posts: 807
Thanks a lot for the valuable info guys!

I will buy a new set of Bosch H9DC today and keep you posted on my idle. I hope it improves with the .36 gap that I set it to.
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1987 mercedes 300E
1995 e320 conversion(hated the 300e grill)
HID/Xenon (D2S)
Keyless Entry
Monochromatic Paint (Custom Blue)
Smoked Tails
Flat Badged (front)
Debadged (rear)
custom "carbon fiber" console
18 inch HP EVO rims
Sold! Now I drive a Monte Carlo SS
http://memimage.cardomain.net/member.../352975_67.jpg
http://memimage.cardomain.net/member.../748335_24.jpg
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  #18  
Old 08-07-2003, 06:39 PM
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Quote:
Originally posted by mike690003
Thanks a lot for the valuable info guys!

I will buy a new set of Bosch H9DC today and keep you posted on my idle. I hope it improves with the .36 gap that I set it to.
I'm confused. I thought the thread started after you had already bought a set of H9DC. ?
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1994 C280, dark green metallic
105k miles

1991 190E 2.6, Black
191,500 miles
(sold to another forum member)

2003 Chevy Tahoe LT, Redfire Metallic
105k miles

1989 Mustang GT Cobra Convertible
43k miles
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  #19  
Old 08-07-2003, 06:47 PM
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I am buying another set apart from that new set I previously bought. I am going to set one set of plugs at .36 and another set at .38 or .40. I plan on testing both sets to see which performs better in my car.
__________________
1987 mercedes 300E
1995 e320 conversion(hated the 300e grill)
HID/Xenon (D2S)
Keyless Entry
Monochromatic Paint (Custom Blue)
Smoked Tails
Flat Badged (front)
Debadged (rear)
custom "carbon fiber" console
18 inch HP EVO rims
Sold! Now I drive a Monte Carlo SS
http://memimage.cardomain.net/member.../352975_67.jpg
http://memimage.cardomain.net/member.../748335_24.jpg
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  #20  
Old 08-07-2003, 06:51 PM
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You don't need another set. You can gap them back and forth. I wouldn't do it 50 times, but you can do it 3 or 4 times with no problem.
__________________
1994 C280, dark green metallic
105k miles

1991 190E 2.6, Black
191,500 miles
(sold to another forum member)

2003 Chevy Tahoe LT, Redfire Metallic
105k miles

1989 Mustang GT Cobra Convertible
43k miles
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  #21  
Old 08-07-2003, 06:55 PM
mike690003's Avatar
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Join Date: Apr 2003
Location: Miami,FL
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Well the Bosch plugs are on sale for $0.69 at Pep Boys until Aug. 9. Save $0.39!!!
__________________
1987 mercedes 300E
1995 e320 conversion(hated the 300e grill)
HID/Xenon (D2S)
Keyless Entry
Monochromatic Paint (Custom Blue)
Smoked Tails
Flat Badged (front)
Debadged (rear)
custom "carbon fiber" console
18 inch HP EVO rims
Sold! Now I drive a Monte Carlo SS
http://memimage.cardomain.net/member.../352975_67.jpg
http://memimage.cardomain.net/member.../748335_24.jpg
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  #22  
Old 08-07-2003, 08:47 PM
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Location: Nashville, TN
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Well, I don't guess I can argue with you at that price :-)
__________________
1994 C280, dark green metallic
105k miles

1991 190E 2.6, Black
191,500 miles
(sold to another forum member)

2003 Chevy Tahoe LT, Redfire Metallic
105k miles

1989 Mustang GT Cobra Convertible
43k miles
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  #23  
Old 08-07-2003, 09:52 PM
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Join Date: Apr 2000
Posts: 236
Installed a set of Champion Platinum plugs in my C280 about 85,000 miles ago. Never checked the gap and have not done anything related to the plugs since. Car runs perfectly and I wonder if it will ever wear out? But keep in mind, MB are almost maintenace free and require very little under the hood adjusting. Really, they are very much like Fords and Chevys.
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  #24  
Old 08-07-2003, 10:25 PM
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Location: Nashville, TN
Posts: 551
Quote:
Originally posted by Peter Fearing
...MB are almost maintenace free and require very little under the hood adjusting. Really, they are very much like Fords and Chevys.
__________________
1994 C280, dark green metallic
105k miles

1991 190E 2.6, Black
191,500 miles
(sold to another forum member)

2003 Chevy Tahoe LT, Redfire Metallic
105k miles

1989 Mustang GT Cobra Convertible
43k miles
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  #25  
Old 08-08-2003, 12:42 AM
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Join Date: Sep 2002
Location: SEATTLE
Posts: 239
Amazing

<>

Are you sure this is a Mercedes? Maintenance free? 85000 miles?

Maybe it's a Mazda or a Mercury or sumpin' else beginning with M.
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  #26  
Old 08-08-2003, 12:43 AM
mike690003's Avatar
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Join Date: Apr 2003
Location: Miami,FL
Posts: 807
Quote:
MB are almost maintenace free and require very little under the hood adjusting. Really, they are very much like Fords and Chevys.
That line made me laugh. If MB's were so maintenance free, why is mercedesshop.com so popular for our problems???
__________________
1987 mercedes 300E
1995 e320 conversion(hated the 300e grill)
HID/Xenon (D2S)
Keyless Entry
Monochromatic Paint (Custom Blue)
Smoked Tails
Flat Badged (front)
Debadged (rear)
custom "carbon fiber" console
18 inch HP EVO rims
Sold! Now I drive a Monte Carlo SS
http://memimage.cardomain.net/member.../352975_67.jpg
http://memimage.cardomain.net/member.../748335_24.jpg
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  #27  
Old 08-08-2003, 01:54 AM
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Join Date: Apr 2002
Posts: 321
that's a good question.

i own a number of benzes. by and large, they are bulletproof. there has been nothing mysterious about them. i tune into this site hoping that someone will respond, finally, to a question i raised months ago. so far, no one has. and the dealer doesn't want to deal with the issue either.

i won't go into it, now, you can research my posts. but it involves the seats in a 1997 s500 coupe. they don't want to do as the manual says they should. why?

a computer chip glitch?

this is a fascinating site, but it has never answered my questions.

so it goes.
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  #28  
Old 08-08-2003, 10:28 AM
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Join Date: Dec 2001
Location: Nashville, TN
Posts: 551
No one has answered my question, either. Here it is:

"If it takes 1 hour to dig a hole, how long would it take to dig half a hole?"

Seriously, though -- sometimes no one knows the answer. Although, we could do a better job of "trying" to help narrow it down.
__________________
1994 C280, dark green metallic
105k miles

1991 190E 2.6, Black
191,500 miles
(sold to another forum member)

2003 Chevy Tahoe LT, Redfire Metallic
105k miles

1989 Mustang GT Cobra Convertible
43k miles
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