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#1
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94 400E strange issue after sitting for a while.
I have one for you! If my 400E sits for a couple weeks, it runs great for the first 10 minutes or so, then starts missing, backfiring, stumbling. After you run it this way for a bit and shut it off, let it sit for hours to cool off, it is fine from that point on. Start it the next day and run it, it is fine. Only after sitting for a couple weeks will it do it again. I thought maybe the gas cap wasn't venting right causing it to build up a vacuum in the tank, but that wasn't it. Anyone have any ideas, or experienced this?
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05 SL600 75K 87 MB 560SL 119K 87 MB 300D 180K 83 MB 240D 110K 64 1/2 Mustang 74 Monte Carlo 32K 75 Fiat 124 Spyder 16 Equinox 15 2500HD Silverado Last edited by mkrazy1; 05-10-2012 at 12:04 PM. |
#2
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400e sitting a while
I had the same problem over the last few years with my wifes 400e, did everything , plugs , injector cleaner etc , it was the distributor caps and rotors, pull them off and examine them , probably trashed about $170.00 on ebay , $200 on ******** for both sets
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#3
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Thanks! I'll check that.
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05 SL600 75K 87 MB 560SL 119K 87 MB 300D 180K 83 MB 240D 110K 64 1/2 Mustang 74 Monte Carlo 32K 75 Fiat 124 Spyder 16 Equinox 15 2500HD Silverado |
#4
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I second what jollygreen said. It is probably the caps and rotors. Classic symptoms. What I have found is that moisture will make its way up into the caps and corrode them if the car is not driven regularly, especially if you are in a humid climate. Driving the car a lot may clear up the problem, but it's best just to replace them. Cost is pretty high, but if you shop around, you can get the Bosch part (exactly the same as the MB part but without the 3-point star) for a lot less. The good news is that they are very easy to replace. It takes me a very leisurely 2 hours to do both sets. Might as well replace the plugs while you are in there too, since the plugs should be done every 30K miles also.
The caps and rotors are about the only semi-weak spot on these cars. Most frequent cause of driveability problems I've found. I say semi because all that's really needed is to replace the caps and rotors every 30K miles and you are good to go. Slightly higher maintenance and expense than the later coil pack E420's, but not bad at all. These are still awesome motors. Driving the car regularly helps too.
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1972 280SE 4.5 1984 300SD, 250K 1991 300SE, 89K 1992 300D (330K miles when KIA'd by mother-in-law 8/10/09 - still sitting in my barn) 1994 E320, 109K 1995 E420, 60K Proud Member of the Mercedes Benz Club of America - Idaho Chapter |
#5
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That makes sense. What is absolutely weird about it though is that after sitting for a couple weeks, it runs fine for the first 10 to 15 minutes, then acts up. What I'm going to do is let it sit for a bit, then pull the caps and see what they look like like. Maybe it does build up corrosion or something. I'll then replace them and see how it does also. I'll update the thread in a couple weeks!
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05 SL600 75K 87 MB 560SL 119K 87 MB 300D 180K 83 MB 240D 110K 64 1/2 Mustang 74 Monte Carlo 32K 75 Fiat 124 Spyder 16 Equinox 15 2500HD Silverado |
#6
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Just as an update... Replacing the distributor caps and rotors resolved the issue. They did look horrible inside!
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05 SL600 75K 87 MB 560SL 119K 87 MB 300D 180K 83 MB 240D 110K 64 1/2 Mustang 74 Monte Carlo 32K 75 Fiat 124 Spyder 16 Equinox 15 2500HD Silverado |
#7
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Great! Now just be sure to drive that 400E often and you should be good to go another 30K.
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1972 280SE 4.5 1984 300SD, 250K 1991 300SE, 89K 1992 300D (330K miles when KIA'd by mother-in-law 8/10/09 - still sitting in my barn) 1994 E320, 109K 1995 E420, 60K Proud Member of the Mercedes Benz Club of America - Idaho Chapter |
#8
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Quote:
All I can say is that my (104.980) originals did around 200K miles with regular cleaning. Even when I replaced them I noticed no difference until the cheap rotor I bought failed. Now I'm on MB parts and expecting another 200K!! Best to all. RayH |
#9
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You can stretch them a lot longer than 30K by 1) regular driving, and/or 2) periodic removal and cleaning of the contacts. If you don't do enough of either, the MB recommended 30K replacement interval works wonders.
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1972 280SE 4.5 1984 300SD, 250K 1991 300SE, 89K 1992 300D (330K miles when KIA'd by mother-in-law 8/10/09 - still sitting in my barn) 1994 E320, 109K 1995 E420, 60K Proud Member of the Mercedes Benz Club of America - Idaho Chapter |
#10
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My car is doing the exact same thing lately even sent out the throttle body for rebuilding, and they said it was fine!!! I've had it towed 3 times, ordered caps and rotors today!!!
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