Idle again.

[Amorphous]

I recently had an idle problem with my car. I checked my ISC and it was busted. I replaced it for a new one. I did a boost test on my turbo and didn’t find any leaks. When I did this I found loads of oil in my intake. I cleaned it out and put a filter on my PCV line to the intake. I cleaned all the oil out of my MAF and car was fine and the idle surge was gone. Accept for 2k rpm idle. I knew it was my BISS and was too lazy to adjust it.

I finally got around to adjusting it today. I adjusted the BISS to 900 rpm (far down as it could go), and I turned it off. Then disconnected the grounds and started her up again. It now idles at 800-900 and surges again K. I yanked out my intake tube and looked inside to see if there was any oil or if my MAF was covered with oil again, and it wasn’t. There was just a small amount at the bottom (I drove it for 2-3 days before I put the filter on it). I began probing the MAF as my Haynes manual instructs because I just suspect that the MAF is just junk. My Air Intake Temperature sensor read 3.6k ohms (around 40 degrees outside). I made a small graph it is slightly off, but not terribly. Then I checked the harness side of it (pin 2 for AIT and pin 3 for barometric sensor) and found a very small voltage from both. Pin 3 should’ve been 12v right from the battery. I got 0.2v . Pin 2 was the same voltage. According to Haynes… its not supposed to be. If the MAF were not getting power, would the ECM be able to do what ever it wants? Idle badly and produce a rich condition? My car still produces a lot of Carbon Monoxide. I can smell it K. Help would be appreciated.

 

[Amorphous]

I also forgot that I did put a aftermarket boost gauge in my car since mine just didn't work. So far highest I seen it go was 8 psi and usually 7 psi at WOT. Is this normal for stock 1g?

 

[Amorphous]

Double checked it again. 11.73 volts to pin 3 and 5 volts to pin 2. Bah. Don't know why I barely got any voltage before. Back to the drawing board. FAIV maybe?

 

[Amorphous]

OH MY GOD! Drives like shit now. Idles ~1200 rpm at lights. While driving, you put the clutch in and the rpm drops to 500 then bounces up. Other times, it'll drop to 500 and the start up lights come on. And then sometimes it'll stall. Not very fun doing 60 in a 50 and having to slow down because you were chasing a 2g spyder eclipse. Then have the car stall and have to turn it back on. Twas fun though. Can't boost for shit either. 4k rpm and it bucks like hell. Guess at first light I'll readjust the BISS again.

 

[JCMDSM]

Could be a boost leak. Perform a boost leak test and see if that helps

 

[Amorphous]

Ok. So, today I went to Sears to pick up a new o-ring for the BISS. I'd seen a post with a link to another how to adjust a BISS and he said his screw was easy to turn. Mine was too, and he said it was because of the o-ring being crap. I went to Sears and found out that they didn't have them at the store. I went out to my car and wanted to adjust the screw again because it was driving like crap at that setting. It had been the first time I drove it that day and it needs to be warmed up before adjusting as I've read from other "How to"s. I open the hood and look around. I went ground my ignition timing and on the way back to my driver side to ground it, I saw that my ####ing intake pipe had come off! I shouted ", no ####ing wonder." Big boost leak there . I burned my self 3times putting on the intake pipe with the screw driver I brought for adjusting my BISS. After that adjusted it up so I didn't have to deal with such a poor idle. I went to Pep Boys, Advanced Auto, and then finally ACE Hardware to find the damn o-ring. Went home. Popped the screw out. Put the new o-ring in and adjusted it again.

Now... I'd say it didn't help. I idles fine 50% of the time and poorly the other 50%. Grrrrr. Boosts fine now with the bloody intake pipe in. I'm starting to lean towards my FIAV. Is there an diagnosis for it? Or is just hit or miss? $800 for a lower throttle body assembly is a pricy hit or miss. So far, ISC was replaced, MAF checks out Ok, the throttle body is clean, the throttle plate is fine, and I put a new O2 sensor in. According to Terry's Talon Troubleshooting Tips #3 - Fast Idle (aka. Idle Surge) last thing to do is the FIAV. I've done all his checks and then some. Any ideas?