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#1
05-11-2007, 12:17 AM
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Old Doll 88 560 SEC
Hi all: I have an old doll 1988 jet black 560 Sec ..and I notice that the valves are sticking. At first I thought it was tranny trouble..but then I was told that it was sticky valves. The rpm every once in a while..goes upt to like 40,000 when it shouldn't be there..I have to stomp on the gas and she cuts back...I am certain there is no doubt a commercial product that will clear those valves..so she won't go up there on rpm's...
Anyone care to comment on which one to get...or should I just bring her back to my mechanic? Any good advice would be appreciated. 
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#2
05-11-2007, 04:28 PM
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gregwild said: The rpm every once in a while..goes upt to like 40,000 when it shouldn't be there.
________________________________________________________________ I assume you mean 4,000 rpms, not 40,000. Sticky valves will not cause your engine to rev to 4,000 rpms. My advice is to take the car to a qualified MB indie mechanic.
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1986 560 SEL (159K miles)
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#3
05-11-2007, 05:20 PM
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Greg, if you stump on the accelerator and Idle speed returns to normal it is very possible that you might have sticky throttle linkage (there are so many of them down there). If you want to DIY first remove the air filter housing, then locate the throttle linkage close to and on the right side of the butterfly plate and while the Eng is reving high just disconnect the linkage (a 10 mm open end wrench is the best tool for the task) then check Idle and see if drops down if so then there is a sticky linkage (ball link) some where and you have plenty of lubrication to do. Start by disconnecting all ball links 1 by 1 and apply some anti-seize compound. spraying WD-40 in the joints without disconnecting them will also provide temporary fix. hope this helps.
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#4
05-11-2007, 05:38 PM
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High idle problem
Another thought:
How is the idle air control solenoid (infront of the air cleaner) doing? Sometimes these things could be the culprit. 600-700 rpm at idle is about right for these cars.
__________________
 1991 560 SEC AMG, 199k <---- 300 hp 10:1 ECE euro HV ... 1995 E 420, 170k "The Red Plum" (sold) 2015 BMW 535i xdrive awd Stage 1 DINAN, 6k, <----364 hp 1967 Mercury Cougar, 49k 2013 Jaguar XF, 20k <----340 hp Supercharged, All Wheel Drive  (sold)
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