MSefi.com read only forum (Jan.15,2018)

Hello,

4.3 TBI, MSII, v3.0

Am I missing something here?

I am at 0 degrees top dead center like 4.3 tbi is supposed to be without computer advancement. I can't get the idle to come down from 1500rpm. I have moved the trigger offset up to 25.0 and that brings the rpm down to 1100. I move the rpm ...

Can anyone point me in a direction for useful information the beginning of making a spark table?

Will

Hello,

4.3 tbi, msII, v3.0

So I confirmed and re-confirmed my engine is has a base ignition timing of 0 degrees at TDC on the #1 cylinder.
I still have an idle of about 1500rpm.
According to my spark table based off of the map reading and advance, the rpm is right wear it should be. I have ...

Hello,

Anyone have any suggestions for setting TDC on my 4.3 TBI, MSII, v3.0

I read from several sources online that at idle factory ECM is looking to keep the advance at 20 degrees. My MS II is currently at 20 advance (read out in tunerstudio and confirmed with a timing light that has an advance ...

Hello,

I am a first time tuner and have read through the various manuals a few times. I have the basic steps but I am getting to a points where I can't make the next step.

4.3 TBI, MSII, V3.0

Question 1: Once idling (around 1500rpms) would it be best to tune the spark table first to try and get ...

Thanks Ken,

This is probably a stupid question but: How do I know which is the bypass connector?

I have read all about the bypass wire on stock situations but I have never had that situation and I made all the connections to the distributor as per the megamanual 8 pin module.

Will

So I figured out atleast part of my high idle problem. As it turns out the distributor got loose.

Question 1) Can anyone tell me how to configure MSII v3.0 to not adjust advance so that way I set my distributor back to TDC on the #1 cylinder with a 4.3 TBI, HEI, 8-pin module?

Question 2) Can ...

I will get another one tomorrow when I adjust the timing.

Sure I didn't think that it really showed that much data.

Hello,

In the mega manual it states that MSII will start your engine quickly and reliably.

Question: How quickly is it supposed to start the engine? My engine takes several sections to catch and start running. It actually sounds like it is cranking faster then the engine wants to go ...

Thanks for the replies. I actually did get it to work once. Found out that the distributor was loose and moved and the advance is holding my RPMs up. However, I have been adjusting the distributor (timing light broke - getting a new one). I can adjust it to the point it idles around 800rpm but any ...

Tried adjusted the IAC so it closes more. Seems to have no affect.
Also changed the accel enrich to trigger off of the MAP instead of the TPS encase that 5% fluctuation makes a difference. This did not seem to help either.

It still idles around 1500rpms. Tonight I shut it off and restarted so it ...

Hey Dave,

I noticed the TPS noise as well. On the graph it looks like a lot however, it only fluctuates between 3-5%.

Will

Thanks Matt,

Even at fully warm 160 degrees (as in TS) it is still idling high. I have it fully closed at 160 steps as the manual suggests.
Any suggestions

Will

Thanks Dave. I will check this out.

Will

Here's my issue- My engine idles steadily and starts reliably, however, the idle starts at 1500 rpm and increases to 1900 rpm as the coolant temp goes up.

I am not sure why this is happening or what could be causing the rpm increase. My msq & datalog is below.

2016-07-13_20.04.08.msq
2016-07-13 ...

Will look into that Dave. Thanks.

Anyone else have any suggestions? [see msq & datalog above]

Thanks everyone!

It would be helpful if you could post a log and an msq. It sounds like your idle control just needs a little work.

Ken

Attached in my log and msq.

Murphy showed up and brought his law with him (no love in NJ). I started it tonight and the idle did not climb but it did not go below 1100rpm ...

Thank you for your reply.

I have read that document backward, forward, and side to side. Even my wife has read that document.

I still have idle frustrations.

Idle starts at 1300 rpms and warms up to 1900 rpms. It seems as if my IAC was going backward. I had it wired backward and then switched ...

Hello,

I am trying to get my 4.3 TBI idling properly.

Question : Will Tune analyze live help with tuning the idle if it idles steady just too high?

Background:
4.3 TBI with MSII version 3.0
TunerstudioMS 3.0
GM HEI 8 pin module
DIYAutoTune 10' wire harness
IAC - GM IAC, 4 wire (square plug ...