In warm temps....

[kchummer]

my 2004 h2 w/ 30k on it seems a bit sluggish after approx. 10 mins. of ridin around..?? When leavin it seems normal, but seems to lose power if A/C is on or is around 90 out....Is it normal or could something like ig. switch be doin it...?? also battery light stays on for 5 sec. after shut off which ive read does relate to switch.....my only mods are Magnaflow exhaust and throttle body spacer...I was thinkin maybe to large exhaust when air is so minimal at 90-100 causes a little decrease in performance....

[kchummer]

no pros ayy....Ill look at forums elsewere

[HummerJim]

Yes, the air mass sensor senses the hot less dense air and after the engine gets warm the performance is not quite what it is in 80ish weather because timing is held back and fuel is sprayed in at a lesser rate - there is a technical discussion about this in the search - but it boils down to the air mass sensor and the ECM. Also, a larger diameter exhaust will trick the ECM into thinking the air is even less dense and cut back fuel delivery more - there's two posts on that too. When I drove through Nevada at 110F last year I noticed the same thing.

[kchummer]

Tx Jim!! makes perfect sense...

[IRA51]

I notice it all summer here in hell with a stock exaust and airbox.

[Big.Z.hummin]

mine does that to when in the 90 to 100 degree range. i lose acceleration and when i step on it my stock air intake screams like a biotch. its kinda annoying but we dont have to many days over 90 here in nashville