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Old 09-11-2003, 22:04   #1 (permalink)
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How do you clean an ISC valve?

Well, I've had my car in the mechanics today getting the harmonic balancer, coolant leaks and oxy sensor replaced. I also asked them to have a look at the dizzy because of that problem some of you may have read on a previous thread.

The outcome of those events was that they replaced the balancer with a Powerbond Street/Race balancer they found that the coolant leaks werent soley pointing to the waterpump but quite a few hoses that were dripping a bit. They pressure tested the radiator to find were the leaks were and tightened them accordingly. A bit of a saving there. and then the oxy sensor was done as well as an oil change. they put the car on the dyno again and left the dizzy alone and said that it WASNT a bent shaft but the bushes were a bit worn, other than that it was still in good condition. I was told to keep an eye on the way it idles now that these critical things have been done and see if the idle quality improves. I mentioned to them the issues I had with the idle quality such as revs pick up while stationary and hunting at low speeds too. I suggested maybe the ISC valve could be the problem and he firmly said that could be dirty and for me to maybe give it a clean.

That leads me to my question of 'how do you clean an ISC valve'?

I know whre it is and what it looks like but what procedures do I need to keep in mind and what hassles would I need to look out for?

Anybody done this before?
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Old 09-12-2003, 02:13   #2 (permalink)
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Re: How do you clean an ISC valve?

I just disc and spray with carb cleaner and wipe with rag. It also could be the idle is too low and the isc jumps in and revs it up.
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Old 09-13-2003, 02:08   #3 (permalink)
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As ebxr8240 said, jumping idle quite often caused by the idle speed being set a bit too low making the ISC cut in and out trying to get the idle right. Make sure the idel is set using the correct proceedure.

To clean the ISC properly, disconnect the wiring plug, and unbolt the ISC (just two bolts from memory). Use plenty of carby cleaner to spray out the insides, I was amazed how much crap came out of mine, it nearly took a complete can of cleaner to get everything out. Remove the old gasket and just use some silicon gasket maker to put it back on.
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Old 09-14-2003, 17:43   #4 (permalink)
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Re: How do you clean an ISC valve?

Thanks fellas, I should get them to check my idle is correct when I go back next.

Appreciate ya help.
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Old 09-15-2003, 06:34   #5 (permalink)
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Re: How do you clean an ISC valve?

How much was your oxy sensor blueoval?

A lot of WD40 sprayed into the ISC after cleaning will also loosen things up. You will get quite a bit of carbon out.

Mike
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Old 09-15-2003, 06:46   #6 (permalink)
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Re: How do you clean an ISC valve?

Quote:
Originally Posted by EDXR8
Make sure the idel is set using the correct proceedure.
Anybody have any idea what the correct procedure is for setting the base idle (on a 4.0 I-6, EF auto, to be exact)?
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Old 09-15-2003, 13:13   #7 (permalink)
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Re: How do you clean an ISC valve?

What's your idle speed at the moment? Should be 700 - plus or minus 100 is within specs.
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Old 09-15-2003, 16:56   #8 (permalink)
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Re: Re: How do you clean an ISC valve?

Quote:
Originally Posted by V8 Ghia Mike
How much was your oxy sensor blueoval?

A lot of WD40 sprayed into the ISC after cleaning will also loosen things up. You will get quite a bit of carbon out.

Mike
Thanks for ya comments JC.

My oxy sensors were about $120ea then another $30 to get each fitted.

Mine were stuffed. The right hand one was completely gone and the left hand was lazy. Gave me unstable idle quality and crap fuel consumption.
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