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Old 04-19-2002, 07:34 PM
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Join Date: Oct 2001
Location: Canada
Posts: 298
Talking 400E rough idle problem finally solved

Well, this is a long story, like many other owners, my 92 400E had rough idle problem since the first day I bought the car. Rough idle only happened during the first 20 seconds after I started the car, with warm engine the idle smoothed out. When engine temperature was low, in summer, it shook violently for about 10 seconds. In winter, it developed a kind of miss fire, it also shook, but not as violent as in summer time. This problem had been annoying me for a whole year, I felt embarrassed when I had passengers in my car.

I replaced rotors/caps, fuel pressure regulator, spark plugs, air filter, cleaned MAF sensor, measured fuel pressure, belt and tensioner, the problem was still there. Later I even started to question motor mounts, timing chain and fuel filter, I already got the parts, was ready to take several days vacation for the project.

Lately Michael, a 500E owner, suggest me to try fuel addictive BG 44K, however in Canada, BG 44K can only be obtained through mail order. I then decided to try some equivalent fuel system cleaner, I bought two bottles of Pennzoil complete fuel system cleaner($14 each). I added one bottle to the fuel tank and filled the tank yesterday, then last night I put the transmission into gear "B", drove it for about 5 minutes, I kept engine rpm between 4000-5500(60-70 kmph). Today, for the first time, the rough idle disappeared, I could only feel slight vibration from the steering wheel after I start the car. I am so happy, guess it can be much better if I finish 2 treatments, I now love my 400E twice as much as before.

THANK YOU! Michael.
99 BMW 540i 6-speed 110K Km
03 SAAB 9-5 wagon 80K Km
92 400E (Sold) 245K km
Still missing the days with the Benz, it kept me busy.
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Old 04-19-2002, 07:38 PM
Registered User
Join Date: Oct 2001
Location: Seattle Area
Posts: 373
Nice case of 'the cheapest & easiest option fixed the problem'. Congrats carman! While your other work didn't fix the problem, at least you've taken care of many maintenance items that you won't have to worry about for awhile.

I was luckier with my E420, it has always idled like glass - hard to tell it's running sometimes. I hope yours becomes more like this. These engines are so awesome!

- Ryan
'95 E420 - 'Shadowfax' 138kmi.
'92 Volvo 740Turbo Bard 193kmi
'74 240D - 'Ol' Green' 4spd Manual 104kmi. (sold )
'77 300D - 'Red' 223kmi (sold)
'75 240D - 'Bianca the Blue Bomber' (sold)
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