86 420SEL missing at idle, idle speed changes
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Joined: Jun 2011
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86 420SEL missing at idle, idle speed changes
I have an 86 420SEL with almost 300k on the clock.
For the last couple of years it has been misfiring a little, worse when warm I think. Last week it got much worse between start ups. Now it feels like it is missing on 3 or 4 cylinders and will barely idle. It also seems like if you step on the peddle a little bit it doesn't make any difference, step a little more and it runs worse, step even more and then it revs up to about 2k rpm.
When it started missing a couple years ago I changed plugs, wires, cap and rotor but I don't recall it making a difference. I also ran a couple bottles of Seafoam through it to clean up the insides.
Looking at other posts I see OVP, ICV and other acronyms I don't fully understand. I suspect these two are the overvolt relay and Idle Control Valve. Is that where I should start looking? Where are these devices?
I have the manuals on CD and they stink. If I can find a section that talks about these devices it won't tell me where to find them.
Also read something about injectors. Is that it a do it yourself job?
Thanks in advance for your help
For the last couple of years it has been misfiring a little, worse when warm I think. Last week it got much worse between start ups. Now it feels like it is missing on 3 or 4 cylinders and will barely idle. It also seems like if you step on the peddle a little bit it doesn't make any difference, step a little more and it runs worse, step even more and then it revs up to about 2k rpm.
When it started missing a couple years ago I changed plugs, wires, cap and rotor but I don't recall it making a difference. I also ran a couple bottles of Seafoam through it to clean up the insides.
Looking at other posts I see OVP, ICV and other acronyms I don't fully understand. I suspect these two are the overvolt relay and Idle Control Valve. Is that where I should start looking? Where are these devices?
I have the manuals on CD and they stink. If I can find a section that talks about these devices it won't tell me where to find them.
Also read something about injectors. Is that it a do it yourself job?
Thanks in advance for your help
Thread Starter
Newbie
Joined: Jun 2011
Posts: 2
Likes: 0
Thank you for the good suggestions.
