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#1
01-28-2006, 10:33 AM
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300E 1988 misfires
I know that it can be 102 different things, but here is the diagnosis.
I changed spark plugs and wires about a month ago when it first start doing it. There were cracks on the wires. I put Bosch plugs and wires in there so the quality should be okay. The problem dissapeared.  Now, almost a month after the replacement of the wires and plugs, it start doing it again.  On any stoplight i have to put it on neutral because the shaking is being felt a lot. Any ideas? thanks for any input 
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#2
01-28-2006, 11:23 AM
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If it were my car I would check the cap/rotor and the coil and its connections.
Haasman
__________________
'03 E320 Wagon-Sold '95 E320 Wagon-Went to Ex '93 190E 2.6-Wrecked '91 300E-Went to Ex '65 911 Coupe (#302580)
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#4
01-28-2006, 01:35 PM
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okay I read in the MB manual that in order to test the diode of the OVP, you connect a multimeter across terminal 31 (+) and terminal 30(-) and observe the voltage reading. I got 0.522 volts (bouncing a bit), which theoretically means that the diode is okay. However I want to open it inside and to check the solder connections. The number is 201-540-32-45 with one fuse and 2 metal contacts at the top. What are the contacts for????????????and how to open the casing??? it seems that these contacts are holding down the black cover.
any ideas Last edited by ACM; 01-29-2006 at 12:14 PM.
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#5
01-28-2006, 02:01 PM
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What do you mean by misfire? If you mean that it seems that one cylinder is giving up then the next step is to do a compression check or better yet a leak down test.
Good luck,
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#6
01-28-2006, 05:02 PM
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FOUND the problem
well, I checked the spark plugs that I replaced about a month ago but there were carbon depostis on all of them (some more some less). So after some cleaning of the plugs the engine is roaring again.
This probably points out that the fuel/air mixtyre is rich (right??) which can be caused from a bad oxygen sensor (right??). Replacing the O-sensor should be a piece of cake as I recall from readings. Is it anything else though? How do I test the fuel mixture of the car? and also how do I read the codes from this car (an 1988 300E)?? thanks for your input
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