Here goes again...

So I went to the car last night to grab something from the trunk, and noticed a small puddle of coolant that had run out from the right front tire area. I decided to leave it until this morning to investigate.
Upon opening the hood, I found the coolant to be coming from the overflow tank cap area. No other signs of fluid anywhere else. For good measure I checked inside the tank and found only bright green fluid, no brown sludge or anything, then I checked the oil dipstick, and found only bright clear oil, with no frothiness or green liquid.
Upon startup, she immediately went to a high (no tach, I'm guessing 3500) RPM and stayed steady there. I shut it down and checked the throttle cable. It was fine. Started again with the same result.
I did a lot of reading today and I haven't been able to find my exact scenario of course, but the closest I could get is suggesting that it could be the air mass meter failing. I did unplug the idle air control valve on top of the engine while it was running just to see what would happen, but nothing did. The temp needle has been fine and never fluctuated.
I am including a photo of a plug I disconnected under the intake manifold while it ran, and when I did, the engine came down to a normal idle and then about 10 seconds later it started running really rough, even backfired a few times. When I reconnected it, she shot right up to super rev again. Is this the air meter plug? I have not been able to find a photo of its location anywhere online including this site. Also my manual has not arrived yet.

I had trouble even figuring out what engine I actually have so I know what to look for. Vlvworld says (based on my VIN) that it's either a kjet or LH 1.0 and kjet.org says its a B21F-9 based on distributor type, ignition module location, etc...I'm inclined to go with the latter as its what everyone here seems to use. I don't really know what all those designations mean, I just want to know so I get the right info for diagnosis.

Idle control valve? Air mass meter? Thank you as always for any help and suggestions

That pix finally appeared in my browser.

That is the Frequency Valve. it is part of the Lamda System, the emissions control that is used with the K-Jet Fuel Injection. It's part of the feedback loop along with the O2 sensor that is screwed into the exhaust pipe.

When it's plugged in you should hear it buzzing. I should always be Buzzing.

The White cap on the Distributor indicates that you have that wierd early version Chrysler MPG Ignition system and not the older more reliable Bosch Ingnition System.

This may help you sort it out. go to this Web Site and

Download the Volvo Problem Solver Advanced Edition-1.pdf

http://www.volvowiringdiagrams.com/?dir=volvo/Trouble%20Shooting%20Guides

Well I decided to give everything a once over again from the beginning, at the throttle cam area, and much to my surprise I found tucked under the cam, was a broken transmission kickdown cable.

What I think happened was by the looks of the cable, it had gotten kinked and/or bound which led to the throttle cable being engaged wide open and then it finally snapped. The cable looks fairly old and worn. Car idles fine once again, and I drove it to confirm the problem, seems to be stuck in 2nd or 3rd gear on road and when I plant the throttle nothing happens, just a slow accelerate, much like trying to floor a manual on the road at 50mph in 5th gear.

The car does seem to shift once or twice from a stop to city driving speed, I suppose that's normal because the tranny is functioning, just not the kickdown cable for highway speeds. Is that a correct assumption?

Also I still have no clue why the coolant system burped. ( it was about a cup or less of fluid) maybe it was just a coincidence that it happened at the same time as this cable breakage. Most of my other older cars did the same thing from time to time, and it seemed to be normal.

I don't know what you have been spending your time reading, but it seems not to be from any of the sources that have been offered here. K-Jet.org from Art and the link I gave you for Volvo Wiring Diagrams.

Because you would now know that you have a B21F engine with a K-Jet fuel injection system, also known as a CI or Constant Injection System.
You do not have an Air Mass meter, you do not have an LH injection system on that car.

K-Jet.org has all the Green Books you will need... for Free, as does volvowiringdiagrams.com.

The GREEN BOOKS are the Official Volvo Service Manuals used by Volvo Techs at the dealership.

As posted on K-Jet.org. look thru the CI related files

http://www.k-jet.org/documents/greenbooks/200-series/?browse=Section+2+-+Engine


this file covers the Idle control

http://www.k-jet.org/files/greenbooks/200/Section%202%20-%20Engine/TP30363-2_cis_system_repairs.pdf

I should probably clarify, I don't even know where the actual air mass meter is located. I have been unsuccessful in my search of a photo of the thing installed. I would assume it would be somewhere inline with the air box hoses, but the large plastic hose from the air filter goes right to that rubber bladder object under the manifold. Is it inside that whole mess?

You wont find an amm on a kjet, that bladder thingy is where the air is metered out of a kjet(mecanical fuel injection)
--
Rene

Sounds like your in the right area to trouble-shoot. From what you described it sounds as if your thermostat is frozen closed and not allowing fluid to get to that sensor you disconnected when testing. Does it over heat along with the high idle. The sensor is part of a loop to the car's computer.
Maybe take the thermostat out, fill the fluid and try it again. You can put the thermostat into hot water for a test too. Put in on a string and start with cold water. It should open as the water gets hot.
What I do when I don't know where something is on my car is just google it. You get pretty good info and pics that way.

I have never heard of a stuck thermostat resulting in an extremely high idle. I mean it's running like I a have it on the floor at 70mph.
The connector I pulled is from under the manifold on the left side. The engine has not overheated. Needle has been normal.