What would cause this.

[WhiteDevil]

So i installed my new AFM N/A Power pipe and Pro-M 80mm MAF on my GT last week. and i drove it a few times. It idles fine and runs great, and it pulls really hard to 5,200 then it like pings/breaks up right past 5,200. Sometimes worse than other times. It didnt do it however the first few times that i drove the car. But it just randomly started. Sorry to be so broad, any ideas.

 

[95snoozer]

if it was programmed for 24s it might do that ... just a though

how hot is your car?

or bad tank of gas... stay off it till you get some premium form a different place

 

[WhiteDevil]

if it was programmed for 24s it might do that ... just a though

how hot is your car?

or bad tank of gas... stay off it till you get some premium form a different place

The calibration card with it says #19 so im ruling that out for now. The car runs nice and cool its got a 180 stat and Fluidyne. I was thinkin it could be the gas too, ill probably try some new gas from a different place.

 

[GTJake]

Are you running 91 or 93? I would say it's bad gas also if it started doing it recently and not right when the meter went on. Also, the power pipe probably flows better than that MAC unit you had, so that may cause a lean condition in the upper RPMs. Maybe try bumping up the FP a little bit.

Jake

 

[94whitesnake]

i'm no pro, but it sounds indicitive of the MAF actually maxing out way before it should? Doesnt make sense with the mods he has, but I'm just throwing it out there. It would suck if that's the case.

 

[WhiteDevil]

Well i use 91 octane. The gas in the tank is about a 3 weeks old because i havent been driving the stang that often. Im not sure how much that could effect the quality of the gas? When i put the new CAI and MAF on it ran good and pretty strong. Then i didnt drive it for a week or so and then i came back and it was doing this. Well here are the steps im gonna take and the order.
1st Fill the tank with new premium Gas
2nd Tune up Plugs, wires, fuel filter
3rd play with fuel pressure
4th play with timing

How does that sound anything else i should do?

 

[95snoozer]

i had a brain fart

THE MAF IS NOT READ AT WOT



play with FP timing and gasoline and keep that radio off to listen to Detonation

 

[94whitesnake]

i had a brain fart

THE MAF IS NOT READ AT WOT



play with FP timing and gasoline and keep that radio off to listen to Detonation

Thanks, I did not know that. I guess that's why it's called "closed loop". Sorry everybody.

 

[95snoozer]

i myself forgot until It clicked in my mind

 

[WhiteDevil]

Really? The Maf isnt read at WOT??

 

[baglock1]

Really? The Maf isnt read at WOT??

At WOT the EEC goes into closed-loop mode. Basically, it disregards any readings from most of the sensors. The MAF, O2's, etc. It sees the WOT and just starts dumping as much fuel as possible into the engine to prevent any lean condition and to piss off the EPA.

 

[swingline]

to piss off the EPA

My O/R H-pipe's goal in life.