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#1
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Fast idle, stumble on acceleration
I recently bought a 1987 560 SL with no idea of its service history. It insists on idling at 900-1,000 RPM, and stumbles on acceleration. Also, when I pump the brake pedal, the idle surges upward slightly. I've searched the archives, but don't feel like just randomly replacing parts. It sounds like a combination of things (idle control unit, plugs wires, etc.) Any thoughts?
Max J. Sandler
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M. Sandler 1986 560SEC: 150,000 miles, runs great, but I've got to sell it (too many cars for one man) 1987 560SL: 122,000 miles, used to run poorly, now (thanks to forum), runs great! 1997 GMC Jimmy: Turned out to be a turkey. 1989 T-Bird Super Coupe: 150,000 miles, still runs great. Ford got it right. |
#2
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High idle
Max;
The idle increase when pumping the brake is typical,no repair needed. For the other problems check thr o.v.p.,it's located in the right side footwell behind the side panel. M.F. |
#3
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Thanks for the quick reply. I've heard the OVP bandied about on this site, but am not quite sure of its function. How does its operation affect idle and/or stumbling?
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M. Sandler 1986 560SEC: 150,000 miles, runs great, but I've got to sell it (too many cars for one man) 1987 560SL: 122,000 miles, used to run poorly, now (thanks to forum), runs great! 1997 GMC Jimmy: Turned out to be a turkey. 1989 T-Bird Super Coupe: 150,000 miles, still runs great. Ford got it right. |
#4
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The OVP fuse and relay can cause all sorts of idling problems. Check the fuse on it first. Please note that if your car was jump started with another car - it could cause the fuse on the relay to blow from voltage surge. Since you just got the car - CHECK THE OVP FUSE AND RELAY - first. It could be your problem. If the car sat for a while before you got it and they jump started it - could be it. Please advise if it cures your problem
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