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  #16  
Old 10-12-2016, 01:01 PM
ILUVMILS's Avatar
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If you're scanner can read actual values post the fuel trim numbers so I can take a look........
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ILUVMILS
MB Shop Foreman
MB Master Technician
MB Master Guild Tehnician 2007
Factory trained in NJ, PA, AL, CA, FLA,
and Germany
27 years and counting!

1994 E320 (wrecked)
2001 E320
2005 C240 4Matic Wagon
2000 E320
2000 ML320
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  #17  
Old 10-13-2016, 10:55 PM
Posting since Jan 2000
 
Join Date: Sep 2011
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I found two things. There were fuel trim codes for both banks. I found the air filter/engine cover not fitted to the mass air flow sensor such that it was not sealing properly on both ends of the sensor allowing unmetered air. It also was slow until warmed up. With no money spent it is now a rocket ship! I figured it would be something simple. The car is just too slick and low mileage for anything serious to be very likely.
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Last edited by Air&Road; 10-14-2016 at 03:10 AM.
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  #18  
Old 10-14-2016, 11:07 AM
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Location: Southeastern PA
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Air&Road, glad to hear the fix was that simple. I expected the SLK320 would be very quick. Congratulations on your purchase. Post some pictures if you get a chance.
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  #19  
Old 10-17-2016, 08:35 AM
Posting since Jan 2000
 
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Well I am not done yet. I drove several hundred miles in the rain on secondary roads with no trouble whatsoever. Started it Friday afternoon while warm and got a light. Started it cold in the evening and when accelerating the power came in and out abruptly as if I were turning it on and off with a toggle switch. Once home I connected the scanner the next morning. Had P0171 high LTFT AND THE COMPANION CODE FOR THE Other BANK.

The air filter and MAF were tight. Started it up cold and had 34.3 LTFT both banks. STFT was normal at virtual zero. I did not run it to warm up. I am driving it to town this morning. I will report any other symptoms or codes.
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  #20  
Old 10-17-2016, 05:25 PM
Posting since Jan 2000
 
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I drove it 20 miles to town. The LTFT on both banks seems to be stuck at 34.3 but it never set the MIL. STFT seems normal. IAT was about 25 degrees higher than normal.
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  #21  
Old 10-26-2016, 07:30 AM
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Okay, I want to post my final resolution in case it can help someone in the future.

The IAT was high and the MAF values were high at 1.09, so I took a chance on the MAF and it solved the problem. The car is now a rocket ship and the LTFT has come back down.

This car was low mileage, well cared for and always garaged. I have been looking for a stick shift V6 car for a very long time, so when I found this car I bought it perfectly willing to sort through the power problem. My gamble has paid off and I am absolutely tickled to death to have this car. Thanks for all the replies.
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  #22  
Old 10-26-2016, 10:12 AM
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Sounds good. How about some pic's. I'm interested in that generation SLK myself as a possible purchase one day. Have you experienced any noticeable quality problems with your previous one in comparison to earlier generations of Mercedes? A lot of opinions seem to indicate poor quality interior materials from what I've read.

- Peter.
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81 240D stick. 316000 miles at purchase. 337000 now
2000 GMC Sonoma
Formerly...
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1981 240D 4spd stick. 389000 miles. Deceased Jan 08
1984 123 200
1979 116 280S
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  #23  
Old 10-31-2016, 03:01 PM
Posting since Jan 2000
 
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Pj, the one I ran through the fence was a ragged car that I bought and fixed up on the cheap. It didn't look bad, but it was not absolutely pristine like the 320 I just bought. These cars don't have some of the high end gadgetry as do the sedans. Even the C class has more in the way of electronic wizardry than the SLK. The build quality overall is pretty good though.

The interiors are indeed a problem. The ragged car I had actually had portions of the dash that were broken. In 2000 or 2001 they introduced what they called the facelift version with some subtle improvements. I think the interiors are a little more durable in the facelift version. The most common interior problem on all of them is that they have a paint coating on top of a black plastic base. As it gets chipped and scraped the black plastic shows through. If the paint on top is white or red or something other than black, it looks ugly when the black starts showing through. My newest car has a black interior, so the chipped spots don't show up very badly. If you can find a car with a black interior it will make it look much better as it wears. This is the worst problem with the interior.

Mechanically the cars are pretty decent. The supercharger wears out if the oil in the gearcase is not kept changed. The odd thing is that MB does not indicate the need for the SC oil being changed. It is a special oil and is a little bit of a hassle to change, but if you have a good SC you should keep it changed. The V6 eliminates the need for this of course, and the V6 car is a more refined car. It is not only smoother, but it delivers very nice torque from idle to redline. This makes it wonderful with the six speed manual, but I expect is quite nice with the auto box as well.

The other issue to investigate before buying one is to see if you fit in it. I am 6'1" and barely fit into it. If you are taller than about 5'11" make sure you are comfortable in it.

Overall I really like the little car. It took me a really long time to find a stick shift 320, but now that I have it nicely sorted, it was well worth the wait.

I am leaving on vacation tomorrow, but I will try to post a picture before I finish packing and leave.
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  #24  
Old 10-31-2016, 09:57 PM
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Thanks for the reply. What about the mechanical top? No problems there?

- Peter.
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81 240D stick. 316000 miles at purchase. 337000 now
2000 GMC Sonoma
Formerly...
2002 Kia Rio. Worst crap on four wheels
1981 240D 4spd stick. 389000 miles. Deceased Jan 08
1984 123 200
1979 116 280S
1972 Cadillac Sedan DeVille
1971 108 280S
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  #25  
Old 11-01-2016, 03:56 PM
Posting since Jan 2000
 
Join Date: Sep 2011
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The top works very well on these cars. It is not uncommon for the cylinders to leak. The cylinders are very expensive from MB, but there is a very competent cylinder rebuilder in the NW US that will make a cylinder like new for a very reasonable fee. The cylinders are not super simple to replace, but within the capability of a serious DIYer.
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  #26  
Old 11-01-2016, 05:41 PM
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Quote:
Originally Posted by pj67coll View Post
Thanks for the reply. What about the mechanical top? No problems there?

- Peter.
Sounds like Air&Road got a really nice 320 stick. I purchased my 2001 SLK230 new in Sept. 2000. No problems with the hydraulic top, but I rarely ever put mine down. It has 72K miles and has been garage kept since new. Mine is red with charcoal interior, the interior peeling has been an issue with these models, as you can see on the console in my picture. But with the charcoal interior it's not as bad as others. Overall it has been a very reliable car and I still get compliments on the condition.
IMHO, a 2001 SLK has to be one of the nicest, cheapest to purchase, used cars on the market. I just backed mine out of the garage and took a few pictures.

Good luck if you decide to purchase an SLK.
Attached Thumbnails
SLK320 Low Power-right-front-1.jpg   SLK320 Low Power-left-front-1.jpg   SLK320 Low Power-left-rear-1.jpg   SLK320 Low Power-drivers-interior-1.jpg   SLK320 Low Power-passengers-interior-2.jpg  

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