My pcmforless has some issues so I got a different tuner to tune it.

the new problem now is/was my iac counts were zero at idle..??

so I’m like wtf I don’t have a vacuum leak. Then I remembered if you have the iac mod and blades open at all the iac will basically go to zero till you give it throttle.

I do have some new logs if any person wants to check them out

 

Look at the throttle position sensor volts. If they are high (approaching 0.90 volts), there's a good chance the stop screw may be extended too far. Unless someone may have opened up the screw slots on the TPS sensor to bring the volts down to the 0.50-0.60 range.

I can review the logs if you upload them here. Just have to be patient. I have a bit of a backlog, and in all honesty, some of the newbies on this site are depressing to the point I don't even want to come here as much as I used to.

 

tps is at .57.

when I did the iac 11/64 hole mod it was with old tune. And I still needed to open the throttle stop.
put new tune in and hooked up scanner and iac was appearing to look normal till it was warmed up and went to zero. Do I kept closing throttle stop till iac was in the 30’s and didn’t dip below 20 so my range now is 25-35 give or take

and to the last comment I totally get that but I’m far from a new guy. Just slow at getting things done lol

 

I can see when you joined, and I remember you from the past. My comment was not directed at the old timers like you.

 

Here is a couple

 

Tossed the 58 and put the 48 back on. Great cold start idles great. Driving is awesome I can put it in 6th at 40mph and no bucking or bogging.

time to get a fresh log and see what’s up

 

This is my most up to date with no changes after putting 48mm back on

 

I'll try and take a look at this one.

Hasn't been a lot of fun on this site recently.

 

TPS volts at idle = 0.71 = OK

IAC counts at idle = 25 to 36 = OK

Big problem is it's still pulling out up to 16% excess fuel. See attached chart. Anything outside a reasonable limit of +/-5% is shown in red.

At idle, the LTFT's are not steady - they are low, then the O2 sensors seem to hang at low volts for an extended period of time, and the LTFT's raise, then the sensors hang at high volts and the LTFT's drop again. Something unstable in the fuel supply????

When you go into PE mode (LTFT and STFT locked at 128) and the ECM targets a richer A/F ratio, the O2 sensors (recognizing the limits/accuracy of narrow band sensors) read very rich, averaging up to 950 millivolts on the right bank. This would appear to confirm it's getting too much fuel, and the LTFT's are correctly pulling fuel out when not in PE mode.

I will look at things other than the fueling, but it is very difficult because the log is riddled with lines of false data. This can be due to interference on the data wire to the DLC.

 

I have another person with similar problems to yours. He originally had a pcmforless tune. I sent him to Moe Bailey. Moe tuned it and returned it and minimal changes in the way it ran.. I contacted Moe about some odd things in the tune, like the LTFT's being allowed to drop below the normal factory program limits of 108. Moe said he would take another look at his work. Owner sent PCM back to Moe, and Moe indicated that pcmforless had apparently "locked the binary file" in some way that the changes Moe made were negated, and the tune returned to the pcmforless settings. You might want to check with your current tuner to see if your PCM has the same issue. Your LTFT's are dropping below the factory program limits.

 

solomon did his own chip

 

Appreciate the help and insight.
the tuner admits he went rich on purpose especially since the pcmforless tune was very lean but I’m starting to wonder if the 58mm was causing the tune to look bad (making it look like I had a vacuum leak?)
I really don’t want to keep bouncing around from tuner to tuner. $$$. And being that my computer is obsolete and lack of tuning capabilities I guess I need to save up my pennies for a Holley terminator and torque head.

 

The aftermarket TB can cause problems at idle, but highly unlikely it was causing the problems everywhere else.

Yes, I overlooked the fact you had a 93 w/ a chip. But I see problems with his tunes as well.

 

Also I’m using Bosch o2’s brand new could those be faulty?

being this is my first ever ground up build on a lt1 I don’t that I made too many mistakes on assembly and I went over everything many times.
fuel system is racetronnics pump 30lb Bosch injectors holds 43-45 psi all through the drive

plugs are 4091’s gapped at .035 msd 6al verified good Opti new harness coil/icm were transferred from old motor maybe few years old
plug wires are junk Bosch

 

Lol I woke up thinking on everything didn’t realize you were posting.

so are we saying both tune/tuners are wrong?
or I have something wrong on my end?