EFI University

Van B · Joined: 06 Nov 2009 Posts: 1

I am running the 882c on my GM L92 engine. I got most of my tune ironed out pretty well last fall before the weather turned cold here in WI. When the temperature is in the 30's or 40's it does not want to start, and when it is in the 50's it will fire but needs some help to keep running.

Any hints on what to look at? I assume it wants more fuel but what is the best way to go about it?

RootesRacer · Joined: 04 Apr 2005 Posts: 461 Location: Arvada, Colorado

2 things.

1) Look at your low temp priming pulses (and low/high threshold temp).
More pulses will wet the intake and help with a dry cold start.

2) Look at your coolant temp (CLT) based fuel multiplier in the temp range you are having issues and tweak those cells to a higher number.

If you need to give it some throttle to keep it running, then you probably need an IAC or a cold temp throttle "leak" to give it more air when its cold.
This is analogous to the choke actuated throttle stop on a carb.

Pantera EFI · Joined: 12 Feb 2005 Posts: 1268 Location: So. California

Hi Jeff, there is an Object "CLT Advance" that can add RPM when the engine is cold.

A cold engine can have a greater spark advance than a hot engine and will run better/produce less emissions.

When the above post's criteria is met, the added control of ignition timing can provide for better low temperature performance.

This advice needs to have perspective:

When the "Hot" engine has an idle advance that is TOO GREAT (then making an adjustment to add to that amount when the engine is cold) this will have no effect.

Lance