IAC - BAC location and cleaning

[mannydingo]

As this picture of both my 95/96 and 97/98 units shows, both have a separate BAC & IAC. The left is the 95/96.

[eddie jr]

As this picture of both my 95/96 and 97/98 units shows, both have a separate BAC & IAC. The left is the 95/96.

How are they separate? They kind of look together to me in that pic as an interelated unit? I am not sure though....

[mannydingo]

How are they separate? They kind of look together to me in that pic as an interelated unit? I am not sure though....

The difference is obvious in that one is fully metallic colored while the other is a black piece. If it were that they were somehow incorporated as one unit, the outside material that houses them would be different. I don't know what to tell you. It's day and night to me. If I can remember, I will try to take another angle of the unit if you want. The picture above I already had put on clubprotege so I just went back to that pick and copied it and then pasted it to my desktop. It made it easy to attach and re-post it.

[eddie jr]

The difference is obvious in that one is fully metallic colored while the other is a black piece. If it were that they were somehow incorporated as one unit, the outside material that houses them would be different. I don't know what to tell you. It's day and night to me. If I can remember, I will try to take another angle of the unit if you want. The picture above I already had put on clubprotege so I just went back to that pick and copied it and then pasted it to my desktop. It made it easy to attach and re-post it.

Ok, i see what you are saying but i think we are on different wavelengths. I know the black thing is the IAC and not metal but what I am referring to about potentially integrated is that the IAC plugs into the BAC and i think they share common passages bypassing the throttle plate. From what I read earlier in the documentation if i recall correctly, I believe it is something along these lines and they work together in adjusting idle to compound the effect (when the engine is cold). I will double check to see what it was it said exactly......

[midnightblue97]

Ahh I see, it must be a 1.5l thing only.
I've had my TB off on numerous occasions and only ever seen the IAC valve and the TPS.

[eddie jr]

Well, good news. I figured out my rich running problem (fuel pressure regulator) and now that choking is competely gone! It was related to the fuel issue as well. I may still try to clean the IAC but there is no great urgency now. It is a whole new car now and runs beautiful.

[dkblu98pro]

eddie jr,
The security torx bits can be found at Advance Auto Parts (if there is one in your area, may be Checker, Schucks, & Kraegen) in a driver set. The brand name of the set is "Mech Power". Hope this helps.

[mannydingo]

So how did you get to the conclusion that it was the Fuel Pressure Regulator? Was it trial & error?

[eddie jr]

eddie jr,
The security torx bits can be found at Advance Auto Parts (if there is one in your area, may be Checker, Schucks, & Kraegen) in a driver set. The brand name of the set is "Mech Power". Hope this helps.

Thanks for the tip! Unfortunately I am in Canada though, so we don't have advance auto. I have found some at a local store, just haven't got them yet since the car is running great now.

[eddie jr]

So how did you get to the conclusion that it was the Fuel Pressure Regulator? Was it trial & error?

Well, not trial and error....i am the type that hates throwing money at cars guessing and hoping for the best. Basically everything I looked at indicated running rich (plugs, reduced mileage, high HC's on etest). I also had a code P0170 Fuel Trim Malfunction. I ended up getting a scanner as it is pretty much needed nowadays with OBD2. I watched the data and nothing alarming other than the fuel trims were way negative (indicating the computer is leaning things out to correct for a rich condition.....no surprise given what i had already seen). An air leak is one possibility for that code so i pulled some vacuum lines and watched the trims....they went positive meaning it is now richening for a lean condition, so that ruled out air leak as I wouldn't have the negative fuel trims. So I moved to the fuel system since it is one of the most likely causes of rich running. I hooked up a gauge to test pressure and it was wayyyyyy high at 82psi (should be i think 47). I then started the car and it went to 92 which is showing that it is not being regulated (or the line is plugged). So i pulled the vacuum line off the regulator and no change at all in the pressure, indicating it was bad. Grabbed a new one and the pressure was back down in the 30's while running (where it should be). I then went for a drive with the scanner and the fuel trims were working properly and were within spec.

[mannydingo]

Beautiful! Patience is a virtue. All you need in life is two things: memory and patience. If you have those two, everything falls into place on its own. I have a poor memory which leads to inpatience and pay dearly for it.