sonix7

Hey everyone, I did some searching and am still really stumped. I just installed the PFC w/ commander. I hooked it up, removed the 4 wires and turned the car on per the install instucts. I got no ECL or any red flags at all, normal showings. The only problem is that my idle will not stabilize after doing the self learning mode. It is really low and erratic. It jumps from high 500 rpms to mid 400 rpms and it shakes like a V8. Is there something I am missing here? After a while it seems to idle and die, it never gets to a steady idle. Its wierd because I still have the stock cat on there and I am hearing some serious crackling noise from under the car like the cat is clogged? I have a high flow cat and new plugs and wires to go on, but I need to pass emissions tommorrow. I still have the air pump, and since they are doing away with emissions here, I have an air pump removal kit (pulleys) to go on too after this test. I just need to get an emissions test done how it is. The only other thing I can say is, its been a couple of months since I drove the car and had it running, it ran fine on the stock ECU before this, I have only added a med SMIC since. So I am wondering if anyone can suggest what might be happening and maybe someone else had this issue. I can give any readings if that would help Let the journey begin. Thanx

sonix7

I just went and tried it again. I reset everything by disconnecting the ground from the battery. It held idle (mid 400 - 600 rpm) up until at the end of the defroster stage of the self learning stage, then it really dropped to the 300 rpm range and died. Its shaking crazy bad and black smoke out the tailpipe. I think because the idle is so low, thats probably what is making the exhaust (cat) raddle. Truthfully speaking, the car does np idle high enough, its too low and choppy the whole time. If I accelerate, things seem fine, but then when I let the idle come back down after that, it dies. The settings on the commander were reading Leading was in the 12-14% and the trailing was anywhere from 6 - (-)4? Injector duty while idle learn was between 6 - 7%. voltage ok, vacuum is like -22 inhg. Anyway got an idea why this thing wont learn my idle? I am a newb to this stuff, so there must be a logical explanation?

cewrx7r1

iTrader: (2)

Is your cold start system hooked up correctly?

Have you checked the PFC settings that you have control over with the commander in order to make sure they are correct for your injectors?

Have you tried adjusting the so the engine gets more air?

Normally when you install a PFC, the idle is too high and will not settle down where it should be. Yours is backwards.


Was anything done to the engine besides installing the PFC?

sonix7

I had the UIM cover polished, not modified. Same with the alt. and I did put in a new IC. That is about it. Once upon a time when I had the engine mostly stock, I had to completely troubleshoot the sequential turbo and I got that running right. So before the install of the PFC, it was running well. Could you elaborate on the cold start system point you mentioned? I have not made any corrections to the PFC at all. I basically just sat and monitored the settings and tried the learn idle and thats what I get. I do have a poor mans intake and still running the stock sequentials, which I was under the impression had nothing to do with any of this, because I am not boosting. Is it normal for the trailing numbers to dip into the negative? I am game to read or listen to anything that will help me learn this better. I am also wondering if it wouldn't help to do the wires and plugs and see what happens. Could it be my ignition? After it dies and does not hold the idle, it does not want to start back up without a pump of the gas. Injectors clogged? Its so weird cause I didn't have any problems before.

sonix7

Ok, I did some more searching and came to the conclusion that I did not touch the idle control screw. Ialso found out where it is located and will go look at it. It sounds like this could be a part of the problem? Is there anything I should watch out for when adjusting the screw? I am also going to change the plugs and wires and see if that helps. LMK if there is anything else I should try. I don't know much about adjusting the map specs and honestly would need some help before I felt comfortable doing it. Anyone game for stepping a newb through this? Thanx

Edit: I also had the TB polished, maybe the screws got misadjusted somehow. Anyone got a good thread or write up describing the TB adjustments?

rynberg

Why don't you put the stock ecu back in to eliminate a variable? Is the PFC brand new and on default map?

sonix7

Yep, exactly. I missed BDC by a few weeks. This would have been a problem anyway. I would hate to have to go back to the stocker. especially after removing the 4 wires. Wouldn't that cause a problem if I reconnect the stock ECU? I want to believe after reading more it has to do with the AAS? I am reading more in the manual as we speak. I understand why many are overwhelmed with these things. I wonder if the AAS was mis-aligned when getting polished? Anyone have experience with this sort of thing?

DaleClark

iTrader: (55)

The car should start and run fine with the 4 wires cut. The ECU may throw a code, but it's just fine for troubleshooting your idle really quick.

I'm wondering if either the idle adjust screw is all the way in, or something's way wrong with your ISC. You're not getting enough air around your throttle plates for an idle, so you just need to look at what should be happening to find the root cause.

Dale

sonix7

Thanx Dale, I am going to go out and change the plugs and wires and adjust the idle. I am looking on page section F - pg 267 in the FSM -94 version. What is the best way to adjust the idle? I am a little confused which screw will do what? I see an adjust screw for the wax rod and one for the fast idle cam. What needs to do what in order to be working properly?

sonix7

Ok, I went and changed the plugs and the old ones were pretty gunky and I assume fouled. I also found that the air hose that connected to the elbow was unpluged. Well I started her and she idled a little higher and was more in the 550- 700 range, but still shaky. Also I have a nice layer of black smoke coming out the tail pipe. I hope this is due to not being driven in over 6 months. I have high octane gas in there. Well I got through to the ac phase of the self learn and it became much lower and started to surge a little and dropped down and died. Can anyone help me? I am going to go back and put the stock ecu in and see what happens. ****!!! This is starting to be quite annoying. I am running out of time.I have today and tommorrow to go and get it emissions tested, and its not going to pass running the way it is right now.

Edit: I just swapped out the PFC for the stock ecu, it does the same thing. I need help with the TB, it has to be my idle positioning. Can anyone help me diagnose this problem. Thanx

EFS.O

You said that you removed the UIM.Check if all the connectors are plugged,especially the connector of the ISC.

cewrx7r1

iTrader: (2)

Mod 101 note.

When ever you give a complex piece of engine to someone who is going to most likely **** it up (and believe me they will), write down all the settings/postions of all adjustable pieces.

One dude whom we rebuilt his engine; gave his throttle body to one of his motocycle friends to polish. It came back completely 100% disassembled.

I made $45 more on that job because I had to reassemble it.