I have a friend that owns a Midas shop and he is able to do a full fuel system clean. He's says it's a 3 stage clean with the final stage being BG44K put in the tank as an additive. I think I might do this. Does anyone have any experience with a process like this, and if there are any risks?
The car is a 2004 S500 with 196,000Km (approx 120,000 miles)
Isn't this what the guys on Car Talk called a "Wallet Vac"?
I was sold a BG-44K treatment once, on my ancient 4 Runner....a 1990...still on the road with nearly 300,000 miles in the hands of its teenage owner...
Absolutely no difference after the treatment.
Except my wallet was considerably lighter when done. Over $100.
From the guy I know in the business, no on the car chemical cleaning is as effective as putting the injectors in the ultrasonic tank. Further, the injectors aren't tested afterwards, so your flow pattern wasn't checked and you have no idea if they flow better, if the pattern is good, or if the flow is balanced across injectors*.
My wife's Volvo idled much more smoothly after the off the car injector cleaning. Makes sense, all the injectors were balanced to within 0.5%. It cost me $84 including shipping. Far cheaper than the BG-44K wallet-vac option...
The only risk here is to your wallet.
Doubt they can make it worse...but they might, if one injector that was already flowing better than the others gets cleaned a bit, while the worst injector doesn't. You would exacerbate the flow difference...leading to poorer idling and performance.
*Here are some excerpts of the conversation with the owner of Hurst Injectors regarding the Bosch units on my wife's Volvo:
"All tested and in the machine till probably midnight, then test again.
I marked them 1-4 and 1& 4 had a less than optimal spray pattern and flow was off. Nothing horrible, dirty filters but for that many miles good. Electrically these are great 12.2 ohms on all 5 (temperature dependent, the shop is 65f) 9.9-10.1 mA which is excellent, what I am looking for here is consistency between all of them, nothing standing out on any of them."
"Hey Astro, will PM the tracking # later this AM. They did come out perfectly, I had to run 1&4 a little longer to get them withing 1% (actually they are within 0.5%). "