TOP END REFINISHING

[XfireZ51]

Split BLMs are nothing new for the LT-5 especially at idle. Not a reason to buy new injectors. Were these the originals or replacements? One of the issues I discussed regarding the proper injector offset. As it is, these aren't bad. Can u tell if LEARN is ON?

[Schrade]

Originally Posted by XfireZ51

Split BLMs are nothing new for the LT-5 especially at idle. Not a reason to buy new injectors. Were these the originals or replacements? One of the issues I discussed regarding the proper injector offset. As it is, these aren't bad. Can u tell if LEARN is ON?

Don't know if this version of DM tells if learn is on or not Anyone?

Can't I assume that it IS on? Since the Short Term is closer to 128, than Long Term?

Doesn't 'Learn' begin a few minutes after CL starts?



No one chimed in to ID the injectors by the snappics, and I SURE don't know.

Anyway here, why did the thing turn @ 3k when I ran it with IAC dis-connected earlier? Could it have been because of the vac leak @ the plenum-PCV connector?

Re-try IAC dis-connect first thing AM...

[Franke]

FWIW...after I replaced my injectors and O2's my Datamaster file CL showed both banks long term trims to be pretty steady at 128/129 L-R. Short term varied slightly about 127-130 for a 15min idle run.
I can tell you that originally I had a bad primary fuel injector (6 ohms hot) (12 ohms cold) on the left bank that gave the same rich indication that you have on your right bank Lterm. I don't know if that helps or muddies the water more.

Without knowing the part number of your injectors its a hard guess if they are original or not but I will tell you my original injectors looked pretty much the same as yours in the pics. I think I mentioned this wayyyyy back in this thread. I would ohm the primaries out cold and hot and write them down.

[XfireZ51]

Originally Posted by Schrade

Don't know if this version of DM tells if learn is on or not Anyone?

Any datalogger should indicate whether LEARN is ON or not

Can't I assume that it IS on? Since the Short Term is closer to 128, than Long Term?

Doesn't 'Learn' begin a few minutes after CL starts?

No. You must be in C/L in order for LEARN to be on, but u can be in C/L and have LEARN OFF.

No one chimed in to ID the injectors by the snappics, and I SURE don't know.

Anyway here, why did the thing turn @ 3k when I ran it with IAC dis-connected earlier? Could it have been because of the vac leak @ the plenum-PCV connector?

Re-try IAC dis-connect first thing AM...

Did u disconnect the IAC OR remove it? If you disconnected it w key ON, then that will block the IAC port. Now if you have remedied the PCV leak, then only one place the air is coming from and that's the throttle blades being too far open. Let's see if it idles and at what rpm?

[Schrade]

Originally Posted by XfireZ51

Any datalogger should indicate whether LEARN is ON or not

...

No. You must be in C/L in order for LEARN to be on, but u can be in C/L and have LEARN OFF.

...



Did u disconnect the IAC OR remove it? If you disconnected it w key ON, then that will block the IAC port. Now if you have remedied the PCV leak, then only one place the air is coming from and that's the throttle blades being too far open. Let's see if it idles and at what rpm?

I had it electrically dis-connected, AFTER key ON - not removed. And I haven't seen a readout, besides '0', in DM, for IAC yet. ??? No SES lights, including for dis-connected IAC.......................................

Will re-try IAC dis-connect again shortly here. This should be done Closed Loop? Or Open?

[XfireZ51]

Originally Posted by Schrade

I had it electrically dis-connected, AFTER key ON - not removed. And I haven't seen a readout, besides '0', in DM, for IAC yet. ??? No SES lights, including for dis-connected IAC.......................................

Will re-try IAC dis-connect again shortly here. This should be done Closed Loop? Or Open?

There is no MALF code for IAC. I would run the motor till it is warm and indicated C/L. Then shut down. Ignition ON, disconnect IAC. Ignition OFF, then Engine Start. Allow the start-up routine to stabilize timing, then check idle RPM.

[Schrade]

Originally Posted by XfireZ51

There is no MALF code for IAC. I would run the motor till it is warm and indicated C/L. Then shut down. Ignition ON, disconnect IAC. Ignition OFF, then Engine Start. Allow the start-up routine to stabilize timing, then check idle RPM.

Alright - went this way perfectly; idle stayed 2275 - 3k for 2 minutes.

Next?


ed.:

Originally Posted by XfireZ51

Ok. Is IAC disconnected? If not, what does DM tell you for IAC counts and what is TPS V at idle? If it's not .57v > TPS > .53v, then adjust TPS with motor OFF.
START motor, then let it idle down. What happens? Still surging? Also, if you unplugged IAC, you should have done an IAC reset after plugging it back in.

TPS voltage .55; IAC 0

[XfireZ51]

Just trying to clarify, with IAC disconnected, warm idle was at 2200rpm? I am looking at 2 different scenarios you just posted. If O/L went smoothly, I would discount an issue w the injectors.
Remove the IAC completely and plug up that port physically making certain that no bypass air is entering. What's your idle at coolant operating temps and C/L?
Is your motor completely stock or what mods have been done

[Schrade]

OK - I think I understand - 'block the port' for by-pass air.

Which of the 2 internal ports is this? The port in the SIDE of the IAC bore? Or in the END of the IAC bore

[Schrade]

The IAC pintle has HEAVY corrosion on it. I know this did not seal.

I hit it only with solvent, and THAT wouldn't touch what I have here...