ISV cleaning...before and after pics
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Burning Brakes
Joined: Apr 2003
Posts: 750
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From: Los Angeles
ISV cleaning...before and after pics
In anticipation of installing a lwf/RS clutch kit, a Steve Weiner chip, top end rebuild, M030 suspension, etc...I decided to give my ISV a thorough flushing with some carb cleaner.
Getting the ISV out wasn't too difficult, but I did have to use a 7mm nut driver to loosen the rear clamp screw since I couln't get enough leverage using a screwdriver. I used a 7mm socket to tighten the rear clamp when reinstalling the ISV.
As you can see from the pics, the valves were absolutely gummed up with crud and I used about 2/3 of a can of carb cleaner to flush everything out, using paper towels and q-tips along the way. I was satisfied that everything was clean when the fluid that came out was clear and the valve moved freely.
A test drive confirmed that the idle was much smoother and the car drove like some cobwebs had been cleaned out. It's such an easy diy everyone should do it periodically.
Getting the ISV out wasn't too difficult, but I did have to use a 7mm nut driver to loosen the rear clamp screw since I couln't get enough leverage using a screwdriver. I used a 7mm socket to tighten the rear clamp when reinstalling the ISV.
As you can see from the pics, the valves were absolutely gummed up with crud and I used about 2/3 of a can of carb cleaner to flush everything out, using paper towels and q-tips along the way. I was satisfied that everything was clean when the fluid that came out was clear and the valve moved freely.
A test drive confirmed that the idle was much smoother and the car drove like some cobwebs had been cleaned out. It's such an easy diy everyone should do it periodically.
Rennlist Member
Joined: May 2001
Posts: 16,139
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From: Eagle ID
What I don't understand is that the ISV is on the intake side, ie pre combustion, so where is all the carbon build up coming from?
As a comparison, here is an intake valve before the 120K rebuild. Bottle of Techron through the last tank before every oil change, and Chevron gas only. Would the Techron/Chevron gas do the same for the ISV?
As a comparison, here is an intake valve before the 120K rebuild. Bottle of Techron through the last tank before every oil change, and Chevron gas only. Would the Techron/Chevron gas do the same for the ISV?
Advanced
Joined: Oct 2007
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Wow. I'd be interested to see what the back of that intake valve looks like but that port looks remarkably clean.
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Advanced
Joined: Oct 2007
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Thanks for the pics Terry. Although that new pic shows the valve face. I was curious what the back of the intake valve looked like. The link below has a side-by-side comparison of two intake valves run on different grades of fuel - cheap vs. tier 1. After seeing your intake ports, if I wasn't a Techron believer before, I sure am now.
http://www.aa1car.com/library/dirty_intake_valves.jpg
http://www.aa1car.com/library/dirty_intake_valves.jpg
Rennlist Member
Joined: May 2001
Posts: 16,139
Likes: 1,166
From: Eagle ID
tony s, I did not take a pic, but it did look somewhere between the face and the port. Much closer to the port.
Which is why I still have the question, where is all the carbon coming from in an ISV?
Which is why I still have the question, where is all the carbon coming from in an ISV?
Nordschleife Master
Joined: Oct 2007
Posts: 5,471
Likes: 209
From: Tacoma, WA
My thought is it's a low pressure area, & stuff gets stuck up there, then bakes in. kind of like the rear end always having much more dirt on it them any other place on the car.
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From: USVI
