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Registered 2007 SLK 350
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62 Posts
Discussion Starter #1
Bought a 2007 R171 on Friday. The people I bought it from were the second owners. It was not a daily driver and was only driven about 3,000 miles over four years. The last (recorded on Carfax) service was in 2018.

This car has spent a lot of its recent life just sitting and she's a little sluggish, so I want to get her healthy and energetic. From what I've read here, my plan is to begin with some Techron Fuel Injector Cleaner, then check for any error codes needing addressing. Maybe new plugs and an oil change? Anything else of a preventative nature you can collectively think of that I can check for or address right off the bat?
 

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Administrator 2009 SLK 55 AMG/Founding member 2006
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94,124 Posts
i did not see how many miles the car has
sparks not due until 80k btw
 

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Registered 05 SLK55 & 06 Kleemann 55K S8
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878 Posts
Yes, engine oil and tranny fluid swap ASAP besides the techron you are doing. Then get her out and stretch her legs some! You can go from there as symptoms arise. Check the serpentine belt too.
 

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Premium Member
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28 Posts
Don't mess around trying to pin point this or pin that, take the car to an independent Mercedes specialist, or an MB dealer and get a total diagnostic check. If you really like the car, plan on keeping it, has low mileage, and you got a good deal, then spend a few bucks to have a Mercedes professional evaluate the vehicle.

Otherwise frustrations sets in, and end result costs for repairs piece meal may be more than at one time to get the car running properly.
 

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Registered 2006 SLK280
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10 Posts
I strongly recommend treatment with Seafoam instead of Techron. I have used it for years to clean and keep the fuel system clean. There is a video on YouTube by a guy whose handle is FARM PROJECT. He has documented practical tests on engines that have seen better days. I’m on my phone at the moment or would post the URL, but he is easy to find.
 

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Registered 2007 SLK 350
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62 Posts
Discussion Starter #10
Complete all maintenance that's past due and especially the transmission service. Check your brakes are working 100% and aren't getting excessively hot. And perhaps clean the MAF.
Thanks eFair. The former MB dealer/servicer has not been forthcoming with records, but I will likely go to our local MB dealer and see if they can access the database or make a call on my behalf.
 

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Registered 2007 SLK 350
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62 Posts
Discussion Starter #13
Yes, engine oil and tranny fluid swap ASAP besides the techron you are doing. Then get her out and stretch her legs some! You can go from there as symptoms arise. Check the serpentine belt too.
Thanks Jet_Fl!
 

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Registered 2007 SLK 350
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62 Posts
Discussion Starter #15
And how's the ashtray?

Maya ~ Taptalk
Thanks Osi! Touched you remembered! LOL It's still stuck, but I'm going to remove the center console cover (around the shifter) and see if I can get a little more play from underneath. Don't want to break it if I don't have to, but I do hope to replace it with a storage tray someday... Desperate times call for desperate measures...
 

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Registered 2007 SLK 350
Joined
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62 Posts
Discussion Starter #16
Don't mess around trying to pin point this or pin that, take the car to an independent Mercedes specialist, or an MB dealer and get a total diagnostic check. If you really like the car, plan on keeping it, has low mileage, and you got a good deal, then spend a few bucks to have a Mercedes professional evaluate the vehicle.

Otherwise frustrations sets in, and end result costs for repairs piece meal may be more than at one time to get the car running properly.
Thanks SLC300NM! I will definitely be touching base with my local MB dealer (although we have had a rocky relationship through a few previous MB's). I'll do a search for a reliable independent MB mechanic. In the past, the electronics were beyond the capability of their diagnostic equipment, but I think a 2007 should be a bit simpler.
 

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Registered 2007 SLK 350
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62 Posts
Discussion Starter #17
I strongly recommend treatment with Seafoam instead of Techron. I have used it for years to clean and keep the fuel system clean. There is a video on YouTube by a guy whose handle is FARM PROJECT. He has documented practical tests on engines that have seen better days. I’m on my phone at the moment or would post the URL, but he is easy to find.
Thanks John! I've used Seafoam previously, but only in carburated cars. I will probably try both Techron and Seafoam about 1,000 miles apart.
 

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Premium Member 2005 SLK55 AMG; 2005 SLK350
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4,601 Posts
If the fuel is a year old, that might account for some rough running. How full is the tank?
 

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Registered 2007 SLK 350
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62 Posts
Discussion Starter #19
If the fuel is a year old, that might account for some rough running. How full is the tank?
Down to about 3/8. Going to run it down to at least 1/4 or maybe an 1/8. Add some fuel injector cleaner and a tank of premium clear gas (once my home refinance goes through!)
 
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