A buddy of mine has a 95(?) 4Runner with the 3.slow that won't idle below about 1200 rpm, and usually in the 1500 - 1900 range. It's been going on for a few months now, but it wasn't really an issue except now he needs to get it smogged.
Some of the details are sketchy, but he says that it started doing this after he sprayed some carb cleaner into the throttle body to clean it out (I don't know why...). The stealership wanted to charge him $700 to replace the throttle body assembly since they thought something was sticking and they would not just clean it up. Their assumption was that the carb cleaner knocked something loose and clogged up something.
I pulled the TB off over the weekend. I cleaned, polished, blew out, etc. I'm not any kind of expert, but the whole assembly seems exceedingly simple. I cannot see how it could possibly be causing the problem unless it's a vacuum leak but the whole thing seems tight.
I removed the throttle return damper thingy with no result. I backed off the low throttle limit screw and if I manually rotated the throttle valve to the point that the butterfly was physically touching the walls of the TB, the idle would drop to about 1000 - still not the 800 it's supposed to be.
If I applied a LOT of suction to the EGR valve, the idle would drop to about 800, but it was running horribly by that point.
I can get a new TB from CDan for about $350 IIRC, but I just don't see that as the problem??
Any ideas? Maybe it's a common problem?
Eric
Some of the details are sketchy, but he says that it started doing this after he sprayed some carb cleaner into the throttle body to clean it out (I don't know why...). The stealership wanted to charge him $700 to replace the throttle body assembly since they thought something was sticking and they would not just clean it up. Their assumption was that the carb cleaner knocked something loose and clogged up something.
I pulled the TB off over the weekend. I cleaned, polished, blew out, etc. I'm not any kind of expert, but the whole assembly seems exceedingly simple. I cannot see how it could possibly be causing the problem unless it's a vacuum leak but the whole thing seems tight.
I removed the throttle return damper thingy with no result. I backed off the low throttle limit screw and if I manually rotated the throttle valve to the point that the butterfly was physically touching the walls of the TB, the idle would drop to about 1000 - still not the 800 it's supposed to be.
If I applied a LOT of suction to the EGR valve, the idle would drop to about 800, but it was running horribly by that point.
I can get a new TB from CDan for about $350 IIRC, but I just don't see that as the problem??
Any ideas? Maybe it's a common problem?
Eric
