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  #1  
Old 09-29-2003, 12:28 AM
mike690003's Avatar
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Join Date: Apr 2003
Location: Miami,FL
Posts: 807
Just when I thought my idle problems were fixed...300E missing again!!

Hello Board,

After replacing my injectors my car ran great. I thought my idle missing problems were gone. Well now the exact same problem has resurfaced. It now hesitates very badly on the first start up and each start up thereafter. When I press the gas, the car bogs down and acts as if it is about to stall. My mechanic said that it might be a large fuel relay that controls the mixture at idle. He also said it might be the EHA located on the side of the fuel distributor. Well I unplugged th EHA and the car did not perform any differently. Could the EHA be defective??

Overheating and stalling!! My car is driving me nuts!!
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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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  #2  
Old 10-02-2003, 07:28 PM
mike690003's Avatar
Registered User
 
Join Date: Apr 2003
Location: Miami,FL
Posts: 807
Bump---HELP!!!
__________________
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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  #3  
Old 10-02-2003, 07:33 PM
yal's Avatar
yal yal is offline
Benz-smart
 
Join Date: Oct 1999
Location: New York, Long Island
Posts: 2,705
Have you or your mechanic tried getting the test harness and testing the EHA, ICV and O2 sensr the way SteveB has often suggested on this forum and in his article?? Without conclusive test results its just a guessing game for us and you.
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  #4  
Old 10-03-2003, 03:28 AM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: SF Bay Area
Posts: 19,745
Just cleared up a headache of my own. After changing coolant, my 300SE had a miss in the #3 cylinder. Checked it five different ways and finally discovered by accident that the plug was bad. It's a Bosch Super H9DCO with less than 5,000 miles on it. Still can't figure if/what the coolant change had to do with it.

Sixto
95 S420
91 300SE
87 300SDL
83 300SD
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  #5  
Old 10-03-2003, 09:35 AM
JetForeman
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Posts: n/a
Sixto,

I'm not sure if you read my post of my tormenting E320 but I just resolved a stumbling issue, that's been driving me crazy all summer, by changing the spark plugs. I too was running the Bosch Supers and they had about 16k miles on them when the problem started.

I put a cheap set of Champions in it and it's been smooth as silk ever since. I know the Champions have resistors built into them but I'm not sure I'm going to trust another set of the Bosch's after my recent hair pulling, head scratching experience.

Makes me wonder if Bosch put out a bad batch of Supers or if they just don't normally last very long. HMMMMMM
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  #6  
Old 10-04-2003, 12:32 AM
The Benzman
 
Join Date: Aug 2003
Location: NYC - Queens
Posts: 28
Plugs rarely go bad, and almost never in a good engine.

They do get fouled by oil slipping past worn valve stem seals/guides or piston rings. If you constantly need to replace plugs, try and discover why!
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  #7  
Old 10-04-2003, 12:40 AM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: SF Bay Area
Posts: 19,745
In my case the plugs look like I installed them last week. They all look the same - clean. After further inconclusive testing, I think heard a tick-tick-tick from the area of the one bad plug suggesting a bad insulator or cracked ceramic case or something like that.

I haven't sworn off Bosch Supers, but I have to wait until I have to put in a worthwhile internet order since I can't find a local shop that stocks H9DCOs. 'til then it's cheapo Autolite 104s. But there might not be a 'til then since I'll be selling the 300SE shortly.

Sixto
95S420
91 300SE
87 300SDL
83 300SD
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