Replace the ICV or ? - Mercedes-Benz Forum
 
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post #1 of 10 (permalink) Old 05-07-2012, 01:18 AM Thread Starter
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Replace the ICV or ?

Hi.

I've had a problem for a few years that the idle in my '87 560SEC was little rough at times. I had my mechanic (not a MB specialist in any way) look at it a few times. We've been through the electric system changing cables and plugs and also checked for any leaks around the air intake and where else it could come from. Also he blew air through the ICV and that that fixed (as good as fixed at least) the problem with the rough idle, alas that (or some of the other things we've been through) lead to a slightly higher idle

Last time I asked him to soak the ICV as I read somewhere in this forum, but that didn't fix the now slightly high idle. In "neutral" it idles around 11.500rpm and in "drive" it neutrals around 7000rpm.

I'm thinking that the only solution now is to change the ICV to a new one but before doing this I'd like to ask if there is anywhere else I could look to get this fixed?

Thanks
Thomas
Denmark
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post #2 of 10 (permalink) Old 05-07-2012, 02:13 AM
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They are expensive to buy. Did he soak it properly? I've done it before a few times and depending on how much carbon gunk is in the ICV, it takes ages to get it clean. A week or more soaked in petrol?

More recently I soaked it in brake fluid on a tip from a mech I know. Worked a treat. Soaked for a week, with rattling it about occasionally, then afterwards lots of cleaning with intake spray, tapping it while cleaning and I used a wooden skewer stick to move the slidey inside bit around to help dislodge dirt.

It's only 2 nuts to remove it, and a couple hoses, maybe have a go yourself.

Otherwise, there was another good solution recently that involved altering the ICV slightly. I haven't time to find the link for you though.

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post #3 of 10 (permalink) Old 05-07-2012, 02:33 AM Thread Starter
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Yeah I've heard that they are a bit expensive, bus as I can't do without my car for more than a day or two I think I might just cough over the money and be done with it.

Thanks for the reply, just wanted to know if there was any other obvious places to look or adjust before I get poorer and get a new ICV
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post #4 of 10 (permalink) Old 05-07-2012, 04:31 AM
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They are expensive to buy. Did he soak it properly? I've done it before a few times and depending on how much carbon gunk is in the ICV, it takes ages to get it clean. A week or more soaked in petrol?

More recently I soaked it in brake fluid on a tip from a mech I know. Worked a treat. Soaked for a week, with rattling it about occasionally, then afterwards lots of cleaning with intake spray, tapping it while cleaning and I used a wooden skewer stick to move the slidey inside bit around to help dislodge dirt.

It's only 2 nuts to remove it, and a couple hoses, maybe have a go yourself.

Otherwise, there was another good solution recently that involved altering the ICV slightly. I haven't time to find the link for you though.
How about paint thinner?
is it safe to soak it in paint thinner?
What do you think? that is my plan
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post #5 of 10 (permalink) Old 05-07-2012, 05:25 AM
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Store Thomas, if you haven't checked all vacuum hoses everywhere in the engine bay, worth doing. I did but missed one, a loose connection where the hose went to the egr on the exhaust manifold. Sorted out my last high idle.
Another option would be buying a used ICV from eBay and doing the soak treatment on that which would still allow you to use your car.

Umut, I tried paint thinners and somehow it didn't seem as good. No harm in trying it yourself though.

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post #6 of 10 (permalink) Old 05-07-2012, 06:45 AM Thread Starter
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Thanks, I'll double check everything and might buy a used one
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post #7 of 10 (permalink) Old 05-07-2012, 07:11 AM
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I have a couple of ICVs that are fine on my 560 SEL for $25. I would also suggest an idle control relay, found under the passenger side footwell. I think yours would be a 004 545 1132 or a 006 545 8532. I have either one available, also $25. Shipping might be expensive, but I'd guess $40 to Denmark for either one or both items in a small box. PM me if you're interested.
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post #8 of 10 (permalink) Old 05-07-2012, 07:48 AM
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^ ElRojo is very reliable, worth a shot.

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post #9 of 10 (permalink) Old 05-08-2012, 02:34 AM Thread Starter
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Thanks, I'll send you a PM in a minute.
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post #10 of 10 (permalink) Old 05-09-2012, 06:56 PM
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I have a couple of ICVs that are fine on my 560 SEL for $25. I would also suggest an idle control relay, found under the passenger side footwell. I think yours would be a 004 545 1132 or a 006 545 8532. I have either one available, also $25. Shipping might be expensive, but I'd guess $40 to Denmark for either one or both items in a small box. PM me if you're interested.
PM with an address to send you $25.00 for an ICV for 420/560SEL; shipping to zip 79912 via U.S. Post office I'll add $10.00. Based on your positive feedback I'll try a used from you; already bought 2 junk ones; maybe the third one is the charm.
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