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#1
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Cleaning out the injectors
Any idea on how to clean injectors on a 1991 560 SEL. I notice also that the car is idling a little rough, small shaking here an there.
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#2
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Chevron Techron is the easiest solution. Just pour a bottle with your next fill up.
Other than replacing the injectors I have also heard of good results with ultra-sonic cleaning. |
#3
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I've successfully cleaned injectors at home. I have access to an ultrasonic cleaner and a variable voltage supply. The injectors open at around 3v. DO NOT USE 12V!
A google search will reveal many shops where you can mail your injectors and they'll clean and flow balance the set of injectors for about $25 per injector.
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95 E320 Cabriolet, 159K |
#4
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Check for vacuum leaks as well. That could cause a shudder at idle
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"I have no convictions ... I blow with the wind, and the prevailing wind happens to be from Vichy" Current Monika '74 450 SL BrownHilda '79 280SL FoxyCleopatra '99 Chevy Suburban Scarlett 2014 Jeep Cherokee Krystal 2004 Volvo S60 Gone '74 Jeep CJ5 '97 Jeep ZJ Laredo Rudolf ‘86 300SDL Bruno '81 300SD Fritzi '84 BMW '92 Subaru '96 Impala SS '71 Buick GS conv '67 GTO conv '63 Corvair conv '57 Nomad |
#5
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You wouldn't want to spend too much money having CIS injectors professionally cleaned. It isn't very expensive just to buy new ones.
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#6
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I hear this all the time. Am I the only one here who thinks 58 bucks an injector is not cheap?
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1984 300SD Orient Red/ Palomino 1989 560SEC 2016 Mazda 6 6 speed manual 1995 Ford F-150 reg cab 4.9 5speed manual |
#7
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No, I guess that's not cheap, but they can be found for considerably less than that.
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#8
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CIS injectors are not electronic; just spring-loaded poppet valves.
They pop open at about 50-60 PSI or so, if memory serves. I made a simple cleaning kit from a piece of clear tubing and some carb cleaner. Just attach the tube to the injector, fill it with cleaner, and stick a nozzle from your air compressor on the other end. A zap of 50-60 PSI air will squirt the cleaner through the injector. That being said, It didn't help my warm start issue, and neither did the new injectors I later bought. So, I can't vouch for it's effectiveness. DG |
#9
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Quote:
It's not that it's "cheap". But it's very close in price to having them professionally cleaned. $58 seems expensive, but I haven't shopped them in a while. Last time I checked, it was $30 to have them cleaned and $40 to buy new ones. At those prices, and injectors with 200K miles on them, I'd opt for new(also, mine's only a 4 banger). That being said, I cleaned mine in a similar fashion to what S-Class Guru did, and had very good results. jp
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Jeff Pierce Current Vehicles: '92 Mercedes 190E/2.3 (247K miles/my daily driver) '93 Volvo 940 Turbo Wagon (263K miles/a family truckster with spunk) '99 Kawasaki Concours Gravely 8120 Previous Vehicles: '85 Jeep CJ-7 w/ Fisher plow (226K miles)'93 Volvo 940 Turbo Wagon '53 Willys-Overland Pickup '85 Honda 750F Interceptor '93 Nissan Quest '89 Toyota Camry Wagon '89 Dodge Raider '81 Honda CB 750F Super Sport '88 Toyota Celica '95 Toyota Tacoma '74 Honda CB 550F |
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