Having problems with your 1999 Audi A4 ?

1986 Honda Accord. Where is and how do I replae

\015 1986 Honda Accord. Where is and how do I replae the coolant "Thermo Valve ".\015 Posted / edited by AnonymousUser on : 20-01-2020

Answers :

First and foremost, turn the key to "run" and look under the backside of the driver's seat. You'll see a little plastic box with a little plastic square on it. This is the computer, and when you pry off the little square, you'll see a red light that flashes the trouble codes at you. It'll flash the first digit of the code then the second, for example 1 flash, then a pause, followed by 4 flashes would mean code 14, which is an IAC fault. Look up the codes here: http://www...adtc.shtml

Most likely, though, you'll be getting a code 14 which means that the computer isn't able to adequately control the idle speed. This MAY mean it is the IAC valve is faulty, but there are other possibilities.

There's two devices that control the idle in this car that Sean01 seems to have combined in his recollection. There's the computer-controlled IAC valve that's mounted over on the right hand side of the engine compartment and then there's a separate thermally-controlled valve that's mounted on the back side of the throttle body. I don't believe there's any adjustment that can be done to the computer controlled valve other than cleaning it, but the thermally controlled valves are very finicky and, in addition to causing erratic idling when there's air in the coolant, require fairly frequent adjustment.

The thermal valve adjustment is at least pretty easy. With the engine warmed up, look for a flat metal piece with two screws holding it on near the back of the aluminum piece that says "12 valves". Take the two screws off and remove the cover. At that point, you'll be able to use a flat screwdriver to move the little pintle thing inside the valve until you get the correct idle speed. Then put the cover back on and you should be set.
Repair Help & Product Troubleshooting for 1999 Audi A4

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