Tune Question?

[sparkinak]

I have a 6.0 lq4/4l60e. I had a basically stock tune with VATS deleted and rear O2 sensors deleted. I have the LS2 Intake with the 90mm Holley throttle body.

My Problem, Idles like its missing and can not rev above *guessing* 1000 rpm with out it dieing/idleing down.

I have not done a Crank relearn.

Could my problem be with the tune and that I need to get it tuned for the bigger intake/throttle body?

Or just let it idle to learn itself. Sounds dumb but thats what I did on my last one. I ran it for 15 or so minutes and then it ran like a champ.

Another question I had is that the Oil Pressure sender sends the signal to the cluster and thats it. I assume that it sends the signal through the class 2 data stream?

[jhankinson]

No on these one of the very few things that is NOT run through class 2 is the oil pressure. It strictly runs it to the gauge in a S-series. I think the silverados and stuff did monitor it through class 2...but the S-series is all stand alone for the OP

[sparkinak]

Right but I wonder why because if it doesn't have any oil pressure then the motor will continue to run? Seems gay. Ok tho so how bout my runability problem??

[philntx]

Kevin,

Your oil pressure sender is probably bad. Does the gauge move at all?

[andrew69_04]

did you do the wiring yourself. Checked grounds and all power wires? might not be firing on all cylinders, might not have some injectors firing.

[sparkinak]

Quote: Originally Posted by philntx

Kevin,

Your oil pressure sender is probably bad. Does the gauge move at all?

The gauge doesn't move. I believe I had it hooked up correctly but the only thing I noticed is that it pegs out at 80+ and I know thats not the case. I have to recheck my wireing because there are 3 wires in the oil sender and I can't find why I need 3... So for the time being I just snipped the wire and have no gauge at the moment.

[sparkinak]

Quote: Originally Posted by andrew69_04

did you do the wiring yourself. Checked grounds and all power wires? might not be firing on all cylinders, might not have some injectors firing.

Yes I did the wireing myself. I have checked my wiring and it is fine. I have narrowed the missing down to #1 and #4. I had a tranny line leaking so I stopped the diagnosis untill I corrected the trans line issue. Plug wires ohm out to 997 seemed high but they are within reason of each other. The intake is a take off so I am pretty sure the injectors are fine. Could be the coils and that will be my next step.

[sparkinak]

I still don't understand the slight rev up and then shuts down to an idle???

Just a tad more information the motor only has 200 miles on it. But it has been sitting for 2 years. Another thought to missfire is the wring aren't seating. I have checked the oil and don't smell any gas so thats a good sign.

[philntx]

Are all of your sensors plugged in until they "click"?

Crankshaft position
Camshaft position

• Have you gone over your harness to see if there are any nicks or cuts in the wires?
• Have you verified that your grounds are good?
• Have you swapped injectors around to see if the missing follows them?
• Do you have any error codes generated from the PCM?
• Did you reinstall the EGR system correctly? (the O2 LG4 had EGR on the passenger cylinder head)

Just some thoughts.

[sparkinak]

Quote: Originally Posted by philntx

Are all of your sensors plugged in until they "click"?

Crankshaft position new and checked
Camshaft position new and checked

• Have you gone over your harness to see if there are any nicks or cuts in the wires? Since I ran all new wire and terminated them myself, I never noticed anything. I have ohm'd out the ones in question and they are zero/ not open
• Have you verified that your grounds are good? Grounds are at same location and then jumpered to frame.
• Have you swapped injectors around to see if the missing follows them? This will be my plans for tonight to try along with doing a compression test on it.
• Do you have any error codes generated from the PCM? I have not tried this, I am trying to locate a Tech2 so i can scan the data.
• Did you reinstall the EGR system correctly? (the O2 LG4 had EGR on the passenger cylinder head) I had the deleted also.

Just some thoughts.

I'll let you know what I find with the injectors/ compression test.

[sparkinak]

It wasn't the tune but I got it figured out.

[sparkinak]

[philntx]

Kevin, the truck sounds great at idle!

Did you get the TPS figured out?

[sparkinak]

Haven't figured out this whole TPS thing out yet. I honestly don't understand it. I get the feeling that PCM is bad but hate to make that call. I have 5v reference. .4 closed and 4.65 at wot. I checked continuity of the wires to verify I had a complet circuit which I do. Verified pin connection. Actually checked pinouts on easilly accesible connectors. Unless for what ever a crank relearn could cause this but I don't see how. I guess I am going to order EFI Live tomorrow and play with one of the other computers I have. I'll see about pulling the program off my 01 denali and see how that goes.

[sparkinak]

Ok I finally figured out a couple things, The reason for the rise in idle and then shut down, is the truck goes into a abuse mode and shuts the engine down to a safe rpm. So basically sense my problem is with the TPS most likely the pcm was programmed for a DBW system instead of a cable driven system. Its looking for a signal that its not getting. Pretty neat, pain in the azz but pretty neat.

[Christobevii3]

When my computer was looking for an electronic throttle body it was idling at like 2500rpm...