Thanks to the clogged fuel injector thread ;)

[LukeZ34]

Luke...send me a log and I will look at it tonight. Most likely (as I have learned from Adam ;)) that a high idle can be the result of the ECM opening the IAC to allow for more air because it is running rich. The ECM is trying to compensate for it wanting to bog and die.

I pulled the ECM fuse last night, so I could do a relearn again this morning.
After I did that, it started fine. Upon startup it would shoot up to 2000 rpm, and then steadily settle down to the ECM's desired idle position. The IAC counts were smooth and steady, so I think for the time being it's fine.
I need to check out the TPS again though. Closed throttle voltage changes between .57 & .59mv, so I think it just needs adjusted a tiny bit to get it under .57mv, OR I need to get a better one. I need to stop buying this GP Sorensen crap, it never seems to be up to GM spec.
It also still has a little dip in the throttle ocassionally when first accelerating from a stop, don't know what that's  from, but I'll try to get a driving datalog tonight.

[TGPilot]

Okee dokee! ;)

[LukeZ34]

Here's a datalog while driving around town a short while.

[TGPilot]

That looks pretty good Luke! :icon_eek: Only thing I didn't like seeing was the Knock Count take a jump to 17 counts as soon as you started the engine. I don't know if the knock sensor will hear a lifter tick or something like that...but it does not move from there through the rest of the log so I don't think it is actual knock.

It looks real good man...maybe Adam can take a gander at it and give his professional opinion.  :icon_cool:

[tcristea]

I agree that the guages can be off but you know as well as I when your car is idling high (we dont need no stinking guages  :laugh: )  I'm running on Jeffs TG160 chip, x-over pipe and 160 thermometer and not the stock one in case I forgot to tell you that.

I will plug my laptop in tomorrow and send you the log and see what you think.  I think you are on to it about the ECM compensating for the rich fuel it's getting nad it probably just needs adjusted in the code.

My only question at this point is why the hell dont I think of this crap until you mention it?????????   :icon_eek: :icon_eek: :icon_eek:  ;)

[LukeZ34]

Just moved the car from the street to the garage tonight.. Started it up, shot up to 2500 and held there, didn't fall off.
Threw it in to gear, pulled it in to the garage, put it in park, shot back up to 2500. I didn't hook up the laptop to see what the IAC or TPS was doing (1AM, would piss the neighbors off), so I'll see if it does it again tomorrow or this weekend.
This is what has been frustrating me. What the hell causes this thing to 'forget' how it's supposed to idle when it did it just fine the last time it ran?

[flybynite]

Luke,I looked over ur log and part throttle cruise like Kenny said it looks pretty good. The only thing that stood out was that the INT bounces around alot(113-156)You might try adjusting the ve tables to get the INT to hover around 128ish to get it dialed in perfect.Let me know if I can be of some help.Later...Adam

[TGPilot]

My only question at this point is why the hell dont I think of this crap until you mention it?????????   :icon_eek: :icon_eek: :icon_eek:  ;)

:laugh: Trust me man...I am no "all knowing" when it comes to the TGP/TSTE platform, but I have been around them long enough to know what to look for. Shit I have been learning more from Adam over the last couple of months when it comes to tuning than I knew 3 or 4 years ago when I was kneck deep in it.

o yourself a favor though...don't get frustrated and give up on the car. They are 16 & 17 years old and most need some TLC to get them back to spec of yester-year! ;) Once you get it where it needs to be you will be more than happy with her! ;) :icon_cool:

[LukeZ34]

Fixed the high idle..
The throttle body stopper screw was out of place. It was keeping the throttle open just a *tad* too much, thus letting more air in to the motor. Backed the screw off just a bit, and it idles like it should now.

At least it was something easy.  :laugh:

[tyroelite]

I can tell you now from experience  ;) that the fuel rail is not an issue if you replace the o-rings from the FPR to the fuel rail.  There are 6 of them in all and if you run to your frindly hardware store you can get #83 o-rings from the plumbing dept and you are good to go.  After all the crap I went through trying to get mine back on right I finally replace them and it went back just fine.

Also, I would check your coild as well if you are having hard starts  ;)

I'm not sure what theproblem here is.  I changed over my injectors for some from a 3800 this past weekend and i didn't need to change any orings and I was able to bolt the fuel rail back down.  I did go to the hardware store and asked for number 83 o rings but what they had by that name were HUGE! certainly not the ones that would fit between the FPR and rail.  I did go and buy new orings for the injectors but they were just the stock sizes and i only got them bc i lost one of them.  ONe thing to note if performing this swap I did have 2 notches in the top of the injector for the clips.  I put the clip around the higher notch and then pushed the injector into the fuel rail.  I had also taken the rail appart from the FPR so i did 3 injectors at a time and got tem lined up as best i could and kinda pulled the FPR out of the way and seated the rails and then the rail to the FPR and bolted it back together.  No leaking and my idle is almost exactly where it was before ~800-900 RPM once the car is warm.  As it is warming up it does run a little rich and idles at aout 1300-1400 RPMs but it comes back down pretty quickly.

[TGPilot]

Depending on your chip you will run at a "Desired A/F" during warm-up as low as 10.2:1 That is WAY rich...but just like in the old days of carburators when the choke would set. You reduce the amount of airflow drastically decreasing the A/F until you begin to reach an operating temp.

Now if you are still rich when you warm up and hit closed loop...then tuning will be required to match the injectors to the tables. :icon_cool: