heat changes tune

[gtpsleeper]

Been tweeking some stuff and have noticed my car runs perfect with the heat off but if I turn it on it runs like 2.0 richer? This ever happen to anyone else?

[Poil336]

that's weird...

you don't think your thermostat's a little stuck and the heat is dropping the coolant temp enough to make the pcm go to open loop do you?

[OH4CompG]

Does it stay that way? When the AC compressor kicks on it adds load to the engine, that could cause it

[gtpsleeper]

that's weird...

you don't think your thermostat's a little stuck and the heat is dropping the coolant temp enough to make the pcm go to open loop do you?

I tune/run in open loop so I dont think its a temp thing

Does it stay that way? When the AC compressor kicks on it adds load to the engine, that could cause it

it stayed this way for the entire 10 min drive home... the thing that bothers me is that it was literally a constant 2.0 richer all across my maf frequency even in WOT...

[darkhorizon]

fuel pressure?

There is basically nothing that can throw things off that much.. Your commanded afr is staying in the 15/16s right?

[gtpsleeper]

command isn moving dark... Ill check out the pressure on the way home tonight...