I was poking around my FC after work today just checking on the general condition of things and came across a couple of small questions.

First off, there's what looks like a sensor going into the LIM in the middle fo the EGR valve, with two wires terminating at a conncetor right next to the TPS connector. The wires near teh EGR side have melted, and where touching and corroded. What does that little thing do, and should replacing the wires be sufficient for repairing it's functionality?

Second, there's a terminal broken off of the sensor in the bottom left of my radiator when looking at it from the back towards the front. Again, it's a two wire sensor, and I'm guessing it measures fluid level? I always check my fluids often, so it's not a huge deal, but I'd like to fix it up and know it's function either way.

Ok, here's the biggest of them all. Here's a pic of my UIM and TB:



I'm just wondering what all the parts do. When I push #1 to teh max, the engine revs in evenly timed surges. When pushing #2, nothing seems to happen, maybe a little bit rougher of an idle, but barely perceptible. And onto #3. That fat line going into it has coolant in it I think (it runs to the BAC valve), and two small vacuum hoses going into it's bottom. Just wondering what it does while I was messing around.

Where's the fast idle cam BTW? I'm not sure where it is and want to lube it up so I can maybe get a normal warm-up cycle out of this car. My remote start is next to useless if it's just idling at 500rpm. It doesn't warm up very much in the alotted morning run time.

Thanks for the future education guys.

 

#1 controls throttle butterflies
#2 i forgot
#3 is actually the BAC coolant line.. good guess

the thing on the radiator is a temp sensor i think.
the two wires nex to the TPS.. i know this one, its...... ACV !!!!! im pretty sure

 

#2 controls the auxiliary throttle butterflies.

On a turbo model, they do a fancy dance of some sort that helps with people who slam the throttle around.

On a non-turbo model, they keep the secondary bores closed when the engine is cold, so people can't drive it hard until it's warmed up.

Mine are zip-tied open. Fixed a random lack of power on the highway.

-=Russ=-

 

surging is always the sign of dead spots in your tps.. test it out and see how it is.

 

TPS = good. It onlt surges when I hold that number 2 thing in, otherwise it's perfectly fine.

I didn't know that little vacuum thing limited the engine either. Should it be retracted when the car has warmed up? Mine is always in the out position.

I'm assuming I should fix those wires too, if the control the ACV they might just be a little important. Hehe.

 

Radiator level is measured at the top, not the bottom. That's a temp switch, part of the emission controls. It's only important if you need them to be fully functional.

In your photo, #1 is the secondary thottle shaft; #2 is the actuator for the double throttle system (the upstream secondary throttles) ; and #3 is the thermowax (not the BAC valve) which increases idle speed when the coolant flowing though it is cold.

 

Cool, is that thermowax part of the fast idle cam system as well? I need to get my car to immediatly begin the warm-up cycle so my remote start is worth something.

 

Ok, I fixed a couple of things this morning and found some other interesting tidbits I've always wondered about, and here's that thing on the LIM that had the fried wires:



I re-wired it, and attached it back where it belongs:



Ok, ready for round 2 of WTF is that part?

1.)
Looks like a pressure sensor maybe?

2.)
It ticks when bumped, bomb, AAS controller part?

3.)
And those... I'm guessing something to do with the headlights.

Thanks for getting these nagging questions from my mind.

 

The thermowax is the fast idle system. It operates the fast idle cam.

That the ACV you're dismantling. It's emission controls.

Correct, it's the MAP (manifold absolute pressure) sensor.

No idea. Any connections?

Relays for the A/C clutch and auxiliary e-fan. The headlight and dimmer relays are the square ones nearby.

 

Ah, well I put it all back together, and holy ****, my little actuator on the throttle body now retracts until it's warmed up, the car jumps to 1500rpm right away without me having to tap the gas, and holy ****, my secondary ports probably weren't working. ******* woot.

That I don't know. There probably are behind the firewall, which would be a really weird way to do it, but the last FC I helped toy with didn't have that, and didn't have AAS..... So... I dunno. I'm hitting up the shop manual to check it out a bit later.

 

your engine bay is so cluttered ;-)

#2 way up top is the double throttle diaphram, controls the opening/closing of the secondary plates and shaft. mine are all gone, just dont beat on your FC when its cold.

what THE HELL is number 2?! its definitely aftermarket. i have never seen that on any FC in my life. it isnt AAS, i took that out of my GXL. it consists of 4 actuators on each strut, the control module near the spare tire, the 4 plugs near each strut, and the switches near the armrest.

 

I want to know wtf that thing is too...

Just a really wild guess, but if it is bolted to the booster it could be a booster brace... very... very... very... strangely done. Heh.

Otherwise... maybe pull it off... what's it made out of?

Might want to type "IT WAS A BOMB" in a reply before you go take it off, so you can just run inside and mash the enter button with your bloody stumps if it blows up. :thumbsup:

--Gary

 

man you guys are young. But I guess I haven't seen one of those in 10 years.


That is a old shock/motion sensor for an aftermarket security system. If you open it up, you'll see a long thin flexible metal rod that when it touches the case sets the aftermarket alarm off.

The unit normally has a single wire attched to one of the top screws. That wire is the trigger to the aftermarket alarm.

That one was probably installed when the car was new.

 

Hehe, of all the people that would know. I'm going to pull it off then. It's really annoying on a bumpy road. I wonder where the rest of the system went though. I haven't found any traces an old system in the car. The only alarm-ish thing it has right now is the remote start.

BTW, took it out today, and it's running smoother then ever, with just a hint of hesitation at 3k in 4th and 5th gear. It's much better though, and I'm going to re-adjust the TPS again tomarrow morning.