C280 (1998) questions - Mercedes-Benz Forum

 
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post #1 of 3 (permalink) Old 05-30-2010, 04:01 AM Thread Starter
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C280 (1998) questions

I just did my 1st oil change and replaced 6 of the 12 spark plugs with NGK platinum tipped (apparently guaranteed for 100,000km)

My air flow sensor (AFS) (I think) has an intermittent fault. This has already been replaced by a merc dealer, as you know they are not cheap. Been driving w/o the sensor connected for awhile, and seems to go faulty when the engine gets hot, like when I use a trailer, it only affects the kick down on acceleration, forcing me to use the manual shift down.

My fuel consumption was very high, we connected the AFS again and it seems to be OK now. On idling, the car sounds like it is missing, but after the oil change and spark plugs (6) it is performing better.

The car only has 172k km and is 12 years old, paid for and reliable.

So here are the questions.

1.Is there anything one can do to improve the idling problem?

2.Do all 12 spark plugs work all the time? (maybe a dumb question but I never was aware it had double spark plugs, the ones we removed were bosch and still looked fine.)

3.The ATF dip stick needs a special tool to remove, is there a trick or a tool one can acquire? Pretty stupid IMO that one cannot check this ATF level. Or is there a valid reason for this?

4.Lastly, the C280 has the adjustment on the headlights that allows you to remotely adjust the beam like when you have a trailer, this just stopped working recently, any tips would be appreciated. I assume this works with the vacuum system as this only works when the car is idling or traveling w/o being in acceleration mode.

I am pretty technical savvy having serviced cars, done engine overhauls in the distant past (getting old)

Thanks in advance
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post #2 of 3 (permalink) Old 05-31-2010, 01:09 AM
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Quote:
Originally Posted by Bernie.Kruger View Post
1.Is there anything one can do to improve the idling problem?

3.The ATF dip stick needs a special tool to remove, is there a trick or a tool one can acquire? Pretty stupid IMO that one cannot check this ATF level. Or is there a valid reason for this?
Check the reply from Sulaco at the bottom of the page, paying attention to the resistor part of the post. I'm not sure it's related to your car but you can hopefully figure it out.
http://www.benzworld.org/forums/w202...ml#post4146940

There is no dip stick for transmission fluid, just a cap with a seal. These cars were supposed to be filled with "Lifetime" fluid, which turned out not to be the case, therefore they thought it would be unnecessary for us owners to be able to check fluid. In the W202 section you can find info on where to buy a compatible dipstick tube or even how to fabricate one. The cap can be removed and the seal is only $1 part to replace.

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post #3 of 3 (permalink) Old 06-01-2010, 10:37 AM
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Quote:
Originally Posted by Bernie.Kruger View Post
I just did my 1st oil change and replaced 6 of the 12 spark plugs with NGK platinum tipped (apparently guaranteed for 100,000km)
I think that you are referring to the MAF. It is not normal to run with it disconnected.

Quote:
1.Is there anything one can do to improve the idling problem?
Air filters OK?

Quote:
2.Do all 12 spark plugs work all the time? (maybe a dumb question but I never was aware it had double spark plugs, the ones we removed were bosch and still looked fine.)
Well, they work in sequenced pairs, of course. Dual spark plug pairs fire together during the lower & partial load range. At medium & higher load ranges, the dual spark plug timing is staggered by 10 deg.

Quote:
3.The ATF dip stick needs a special tool to remove, is there a trick or a tool one can acquire? Pretty stupid IMO that one cannot check this ATF level. Or is there a valid reason for this?
ATF is not 'burned' as is engine oil, so apart from a leak, there is no reason for any consumption. A dipstick would help though, to keep an eye on it's appearance/smell.

Quote:
4.Lastly, the C280 has the adjustment on the headlights that allows you to remotely adjust the beam like when you have a trailer, this just stopped working recently, any tips would be appreciated. I assume this works with the vacuum system as this only works when the car is idling or traveling w/o being in acceleration mode.
A page from the WIS that describes the operation is below. Could be a vacuum line fault.

Quote:
I am pretty technical savvy having serviced cars, done engine overhauls in the distant past (getting old)
Me too! You have the first of the wonderful M112 V6 engines. I have one of the last in my 2004 CLK.
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File Type: pdf W202 HRA.pdf (206.9 KB, 83 views)
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