Need Some Reliable Knowledge on E320 Tune Up - Mercedes-Benz Forum
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#1 (permalink) Old 01-19-2010, 02:26 PM
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Need Some Reliable Knowledge on E320 Tune Up

Hey, I just wanted someone to help me with a couple of, probably, stupid questions. I want to do some maintenance on my car, a 1996 E320, easy stuff spark plugs etc., because Ive got a check engine light and a very slight rough idle and less acceleration randomly usually when car is warmed up,(diagnostics said cylinder 4 misfire), so im hoping or rather praying, that it is something easy like that. I have done a ton of research and Im pretty confident about changing the plugs and stuff. So here are the main questions.
1. Do I have to disconnect the battery for the plug change, I have heard yes and no. I dont want to have to, bought the car used with no manual dont know how to sync sunroof and stuff.
2.What else could I do that is reasonably easy that would make the problem stop besides MAF?

Thank you for any information. Im new to Mercedes but really love them and am trying to get as much knowledge as possible.

Mike
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#2 (permalink) Old 01-19-2010, 05:11 PM
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No to the battery pull.
Ya either got a bad wire or a coil acting up. That is the first guess.
(did you wash the engine?) MAF doesn't cause a cylinder misfire.
Buy a cheap obd2 scanner. You'll like having it in the glovebox . Autozone for ~$60.oo

aardvark
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#3 (permalink) Old 01-19-2010, 05:18 PM
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I'd say before you do anything else, drive it by an Aamco, they will read codes for free. Write them down and come back here, search them in the stickies or post them.

Plugs are every 30K miles in the M104 and the connectors on the coils are known trouble areas. Again, though, I wouldn't willy-nilly just start swapping parts.

BTW, there is a very inexpensive code reader on Amazon that will do all basic diagnostics (and erase codes, too), it's like $40. If you want more, the Innova's will do real time and data store, but you're up above $150 at that point. If you plan on maintaining your car yourself, a code reader of some kind is indispensable.

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#4 (permalink) Old 01-19-2010, 05:26 PM
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Yup.
Code readers/scanners on these cars, it's a must it seems.
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#5 (permalink) Old 01-19-2010, 06:11 PM
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^^^ Yeah, and how goofy is it that I own three in one sense or another...although I can rationalize it. The little cheapo (amazon equivalent) is under the seat...all the time (except when it's plugged in, lol). It's also the one I'll happily plug into someone else's ride, MB or otherwise. The much more dear (cost-wise) Innova hangs out at home for advanced diagnostics, live data, etc. when necessary...and the dedicated laptop and multiplexer stays in a nice, cool dark place unless I need to access stuff I can't otherwise. (I think it needs lots of rest. )
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#6 (permalink) Old 01-19-2010, 06:24 PM
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I was getting (I think)p400 codes up on a regular basis. EGR.
I would spray it out and be good for weeks. Next thing you know, it comes back.
I played that game all last summer. When on a trip, if you cannot clear the code, yoou lose half of your dash readings. Frustrating.
So yup. I keep one in vehicle at all times just so I know when on the road and malfunction pops up, I can see if it's something that will hurt the car, or can I drive in.

Seems quite often on this vehicle, and I do hate losing dash functions over something stupid.

aard
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#7 (permalink) Old 01-20-2010, 12:38 AM
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Yea I actually did take it to the local autozone and used thier scanner and it came up with a Cylinder 4 misfire code( I cant remember the number off the top of my head). I actually inspected the cylinder 4 spark plug and it was pretty grimey and much worse than the rest of them so i swapped them all just because i had the whole thing opened up. When I started the car up for the first time it was running great then I hit the gas a little bit and there was a bit of hesitation on acceleration and the check enging light came on. But after I went back to Autozone and erased the error code from the car with the scanner it has been running perfect, i tried for an hour and a half to get the check enging light to come on under the same circumstances and it hasnt misfired once. so hopefully that solved it. Thank you guys for the information much appreciated I was at ease with the battery connected today
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#8 (permalink) Old 01-20-2010, 12:49 AM
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Ok one more question. I put Bosch Platinum +2 spark plugs in my car because thats what was in the engine( I just bought this car yesterday). Now I was just reading that this is bad. Now is it bad like bad for the engine or bad like I will lose 10 HP?

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#9 (permalink) Old 01-20-2010, 10:34 AM
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M104

Use copper plug.
That engine spits at platinums and will run happily on copper plugs all day long.


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#10 (permalink) Old 01-20-2010, 12:58 PM
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Quote:
Originally Posted by ohlord View Post
Use copper plug.
That engine spits at platinums and will run happily on copper plugs all day long.
+1

M104 engines really seem to dislike both platinum plugs and multi-tip plugs. The proper plug to get is the non-resistor version. You may have to look around a bit as Bosch stopped making non-resistor plugs. My dealer only hand resistor plugs in stock.
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