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I kindof have the same problem but to a lesser extent. My car will do it's normal cold idle/high rpm at startup, and once it's warm, drop the RPMs down to between 600 and 900. My problem is when I come to a stop at a light or something after either a short block or a long highway stint, the car will stay at roughly 1200 RPM for approximately 15-30 seconds after I stop before dropping back down to between 600 and 900 RPM.... It doesn't matter if I push in the clutch way before the stop while braking, it starts the 15-30 second count down after the car is completely stopped. It only does this when it's cold out... I think it has something to do with the fact that there is no water/coolant going to anywhere near the TB. It doesn't really bother me, just thought I would post up my experience, perhaps get some input into it.
<font color="#a62a2a" size="1">[ December 06, 2002 11:05 AM: Message edited by: exciv2000 ]</font>
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Joe,
The only way to "Bypass" the thermo valve is to REMOVE it and create a plate to cover the open holes in the base of the throttle body. The common misconception is that by running coolant directly from the head to the IACV, and skipping the inlet/outlet passages of the thermo valve... that it is "bypassed". NOT TRUE... bottom line.
Your thermo valve may be serviceable. This is easiest once you remove the throttle body from the intake manifold. Looking at the firewall end of the thermo valve, remove the two small screws holding the cover plate. Inside, you will see a bronze colored button with a white ring surrounding it. There are two recessed grooves in this ring... directly across from each other and passing through the center of the assembly. Using an open pair of needle-nosed pliers, screw the white ring in a clockwise rotation until it stops... when it suddenly becomes difficult to turn further (the ring is somewhat fragile... breaking it will require the purchase of a new thermo valve). Now, re-install the plate and throttle body. Don't forget to have an extra T/B gasket just in case the one you have gets damaged during this process... there is no sense in fixing one vaccuum leak and creating another !!!
heheh
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I had the same problem a while back...thanks for the help about a year ago Jim [img]tongue.gif[/img]
Eventually, instead of getting a new valve (mine was still fluctuating even with the screw all the way in), I just ended up wrapping the SOB in some quality duct tape and popping it back on, covering the holes.
Worked like a charm!
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Excellent. That may be another option if screwing in the inside piece is not enough to fix the problem.
A big question on my mind. . .and I may be alone in this with some other Cali people, is whether doing something like that is smog legal?
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Joe,
You cannot see the ring from cooldred1's pic. It is located under the plate on the end of the Thermo valve pointing toward the LEFT side of the picture.
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Thanks for the pic Cooldred1! Is the white ring that Jim talked about in his post visible in this picture? Or is it in one of the 2 holes that I can't really see into?
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OK, I got around to checking my problem. first things, first, no fast idle thermo valve on a manual transmission car [img]redface.gif[/img] .
But, I did try covering the IACV port and when I do this, the car idles steady at low RPM levels again. This means the problem would be the IACV leaking then, right? I assume so since this proces should have isolated the IACV and any related vacuum leak.
So, I assume I simply have to replace the IACV?
I also finally threw a CEl, codes 71-74 I beleive, meaning a random misfire and one of the suspects for the code is the IACV.
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CPA, you don't have a fast idle thermo valve? Did I misunderstand something?
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Well, the Helms manual only lists the fast idle thermo valve for automatic transmission - seemed odd to me. Also, I only had one port in my throttle body that goes to the IACV. Now I question myself....Maybe its an OBD II vs OBD I difference?? I'll go pull it apart..again!
<font color="#a62a2a" size="1">[ December 08, 2002 08:01 PM: Message edited by: cpa ]</font>
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My thermo valve is located on the underside of the throttle body. It has a coolant hose going directly form it to the head. The coolant hose exits the thermo valve area at approximately 2'oclock when looking at it from the passenger side.
But you said that when you took off your intake, you only have 1 hole on the inside, right?
Maybe it IS an OBDI vs. OBDII difference. [img]confused.gif[/img]
