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Heres my question. How much power is lost when u go from running in 30 degree temps to 80 degree temps. in the winter time it feels like im running a 100 shot of nitrous, and in the summertime, it feels like i lost 2 cylinders. it really sucks. not sure if the maf is working properly, even though it was dyno tuned.
yeah, when its cold the oxygen molecules are more densely packed together. When you open the throttle and the cool air comes rushing in, its like having a supercharger pushing more air into the engine.
ok people, i appreciate the responses, but we can get past air density. i was lookin more for hp numbers and if maybe my sensors such as the maf may not be functioning properly. i did hit it by accident a couple of years ago when i was taking out the honeycomb screen.
if you suspect that the air temp sensor is bad, you could borrow a MAF from a buddy and see if it makes a difference. If so, buy a new one. If you descreened the MAF, buy a new MAF and put it back stock so it can work properly. You're probably running lean right now if you're descreened.
yeah, i can read, maybe u should start ignoring my posts, beacuse theres plenty of other members that are willing to help without trying to make me feel stupid. sorry if im not a mechanic or college educated.:cowl::sadno:Quote:
Originally Posted by Quik
a failed IAT reading -32* should cause the PCM to fatten the fuel mixture up. That would compensate for the bad air readings over a descreened MAF meter.
thanks red, when i hit passing gear, my truck looks like a diesel with the amount of unburnt fuel that comes out. plus i get horrible gas mileage in the summer
That sounds like you're having severe detonation problems. I'd take your truck somewhere and get a dyno tune or live tune with a wideband hooked up to the exhaust. You should not be able to see it do that under acceleration normally. If you don't take care of it before long you may knock the bearing out of the bottom end with that much knock. You may not hear it but I'd bet its doing it.
wont that eat up your cats too?
hhhmmmm, but i just had it dyno tuned this summer and when im at wot- my a/f gauge says its almost perfect. maybe ill bring it to get re-tuned. thanks red
looks just like that pretty much, but just for a couple of sec. when i hit passing gearQuote:
Originally Posted by Quik
could it really be detonating red? i only run 93 octane, and i nver heard it knock once. not that i know exactly what to listen for. but no abnormal noises.
Yeah, they need to check out what is causing the issue. A WOT tune isn't going to work well on a street driven tune when compared to a live tune. I'd still say put a new MAF on there and get a live tune. I would toss the MAF and get a speed density tune if it were me. I'm loving mine. :thumb:
Oh yeah, you still need the IAT sensor so you cant toss the MAF unless you install a Camaro type IAT sensor to do that duty.
jannetty racing had me hooked up to a wideband and hooked to my fuel system and said my fuel pressure was perfect.
isnt dyno tune most accurate?
they welded in a new bung right about where u just describe
yeah, sounds like they did it correctly. Next question is how many hours they had on the sensor will affect its accuracy.
Good luck and keep us informed on what you find out. :thumb:
alrighty. thanks for the help guys. im gonna do some research, probably buy a high flow maf , and possibly get it retuned. maybe it has something to do with the truck being dyno tuned with 87 octane in the tank, but since then ive just run 93, because jannetty said the computer will adjust the timing automaticlly
Yeah, you have to learn to bite the bullet on the fuel and only run the highest octane at the pumps. It only makes sense if you paid $500 to get performance from a tune, you gotta run the performance fuel to get the most from the tune otherwise you wasted $500.