Initial scan, hunting idle

[Weatheralls Auto]

3500 using 3400 Pcm and GTP injectors (flow rate 220)

Idle is hunt a bit 25 to 50 Rpm, worse the lower the idle.
I used Tech2 and idle smooths out after 1100 commanded Rpm.

Checked for Vac leaks, none.

here is a quick scan at Operating temp.

http://www.scandepot.net/viewscan.php?pk=5028

edit, should also mention that this is a Manual trans.

[SappySE107]

fueling is off. I don't know if 220 is right or not as DHP is different values than HPT.

[Weatheralls Auto]

What tells you my fueling is off?
My AFPR from TCE doesnt seem to be working correctly, pressure is @ 55psi with or without vacuum.

This is how I came with my IFR for injectors

using GTP injectors

Stock injectors for the 3400 were 22.5 @ 55psi
Gtp are 36 @ 50psi

stock IFR for the 3400 with 22.5 @ 55psi is 371

by staying with the Stock 55psi they would flow 37.7571
So 22.5/37.7571 = .5959 * stock 371 IFR, new IFR would be 221.

[SappySE107]

That is odd that it doesn't change pressure with vacuum.

What PSI are those injectors at for their 36# rating? your LTFT tells me your fueling is off.

[Weatheralls Auto]

the 36# were at 50psi, so I converted that to 55psi they would flow 37.7571

Something really off with the afpr, if I lower the psi below 50 the Vacuum seems to change the pressure,

[SappySE107]

Might be because its based on a stock regulator and they wouldn't increase above 50 based on vacuum alone.

[Weatheralls Auto]

May have to get a stock fpr and recheck, then if it works better, transfer the TCE cap over.

You think this would cause the idle hunt?

Basically a Stock 3400 tune except for Injector flow rate and some DTCs, I am just starting out the tune.

Engine went in this weekend.

3rd Gen Cavalier

[Weatheralls Auto]

Any tips?
Wideband bung should be here this morning, and replacing fuel filter as well.
Not sure if I am trusting my HO2s currently.
If it is doesn't corelate with the WB I will replace it.

Not much tuning done at all, but this is what I have to work with.
Quck initial test drive.

http://www.scandepot.net/viewscan.php?pk=5035

[SappySE107]

why are you going full throttle on something you haven't hardly tuned?

[Weatheralls Auto]

Just that one test, just to see what I am up against lol,

since it was a stock 3500 running stock 3400 code, was hoping it would be a little closer.

[Weatheralls Auto]

So, except for not going WOT lol, any other tips.
Hope to get some time tomorrow for some tuning.

[Weatheralls Auto]

Just starting my VE tune now, having problems with the Table Modifier though.

I follow the book, when I try to import my new VE table it fails because it is missing variables ?

Scan http://www.scandepot.net/viewscan.php?pk=5042

Original VE Table http://www.scandepot.net/viewscan.php?pk=5044
Modified VE Table from Table Modifier http://www.scandepot.net/viewscan.php?pk=5043

What am I doing wrong?

[Weatheralls Auto]

Ahhh, Set KPA range in table modifier

[CNCguy]

Rob,
What did you find out about your fuel pressure? The pressure should change with vacuum unless the spring is bottomed out. Can you adjust the pressure higher?

[Weatheralls Auto]

It was acting really funny, but I knew my Fuel Filter was probably plugged as when I replaced the pump 2 weeks ago it was siezed on.
I had let it sit and soak and have finally replaced it.

Pressure does seem drop a very tiny bit with vacuum, but not much.
I have been busy at work and not had a chance to get to it again.

This one was the complete unit, what Base do you use? pre 2000 ? or newer?
I was thinking of getting a new 2000+ base (55psi) and try that.