Major Problems, Need Help

super240sx · October 29th, 2006, 03:53 PM

I have a 99 GT with nothing but a BBK cold air intake and an off road H-pipe. Every time you give it more than half throttle it starts to bust out and it sounds like its starving for gas. It only does it when it reaches its normal operating temp. When it is below 190 degrees it runs fine. Already reaplaced MAFs and got some mil eliminators for the off road H-pipe

GTSilver · October 29th, 2006, 03:58 PM

try changin the spark plugs

mjkids · October 29th, 2006, 05:12 PM

i have a bbk on my car with a x pipe but i run a 160 t. the cool the better

built54 · October 29th, 2006, 05:21 PM

Well to a limit... The engine has to be so hot, or it will burn excessive fuel, and not run its best

mjkids · October 29th, 2006, 06:00 PM

my runs great at 160 temp

Boomer · October 29th, 2006, 07:38 PM

Check to see if the filter element is real oily, if it is, clean the MAF you may have oil in it causing a misread after the car warms up. Seen it a few dozen times with K&N filters and a few others as well.

Also on a a note built54 is correct the engine needs to be hot and the factory tune is set to run better at 190* than it will at 160* without proper tuning. The factory setting allows more fuel and less timing in closed loop(cold) and at the proper temp returns to open loop adding timing and leaning the A/F . Colder is not better , even tuned you'll see maybe 1-2 rwhp on a dyno.

sctravis77 · October 30th, 2006, 02:33 AM

My 95 GT did that shortly after washing my K&N filter. I used an electrical cleaner and sprayed the MAF screen and it worked fine.

twinturbo · October 30th, 2006, 11:27 AM

Based on symptoms, and the temp ranges you describe, sounds lean to me. You switch from one fuel table(based on a high or low temp range) to another at a certian point. The low temp range is a bit richer, so I'd be looking for what is modified on your car that could make it too lean. (maf?)

The mention of spark plugs is also valid, as leaner mixtures require more spark energy, and you see the cause and effect here. I run .050 gap on these cars, normally-aspirated(more than .060" is too large a gap to me)

HTH

twinturbo · October 30th, 2006, 11:28 AM

Originally Posted by Boomer

Check to see if the filter element is real oily, if it is, clean the MAF you may have oil in it causing a misread after the car warms up. Seen it a few dozen times with K&N filters and a few others as well.

Also on a a note built54 is correct the engine needs to be hot and the factory tune is set to run better at 190* than it will at 160* without proper tuning. The factory setting allows more fuel and less timing in closed loop(cold) and at the proper temp returns to open loop adding timing and leaning the A/F . Colder is not better , even tuned you'll see maybe 1-2 rwhp on a dyno.

Funny, I've seen 4-8hp, dropping the op temps 20-25*, running 180-190* range.

Boomer · October 30th, 2006, 02:27 PM

Thats funny, our dyno showed 2 rwhp peak. Well whatever not going to argue, my point was if you do it get it tuned or it is a waste.

mjkids · October 30th, 2006, 05:48 PM

all mustang run different from owning four mustang 1979, 1985, 1988, 2000, thats what make mustang one of the best cars for bolt ons

October 29th, 2006, 03:53 PM	#1
super240sx Look Ma! My First Post! Join Date: Oct 2006 Posts: 1	Major Problems, Need Help I have a 99 GT with nothing but a BBK cold air intake and an off road H-pipe. Every time you give it more than half throttle it starts to bust out and it sounds like its starving for gas. It only does it when it reaches its normal operating temp. When it is below 190 degrees it runs fine. Already reaplaced MAFs and got some mil eliminators for the off road H-pipe

October 29th, 2006, 03:58 PM	#2
GTSilver Enthusiast Join Date: Aug 2006 Posts: 699	try changin the spark plugs __________________ 2002 GT K&N CAI O/R X-Pipe Race Bullit Mufflers SCT Xcal2 w/Custom Tune By RWTD 4.10 Rear Nitto D/R's FR500 Rims 17x9 17x10.5 http://i118.photobucket.com/albums/o...ver/cpsing.jpg

October 29th, 2006, 05:12 PM	#3
mjkids Enthusiast Join Date: Oct 2006 Location: ct Posts: 710	i have a bbk on my car with a x pipe but i run a 160 t. the cool the better __________________ 2000 ford mustang gt convertible 2004 ford lightning truck 2001 ford mustang/cobra 2008 ford f-350 4x4 truck

October 29th, 2006, 06:00 PM	#5
mjkids Enthusiast Join Date: Oct 2006 Location: ct Posts: 710	my runs great at 160 temp __________________ 2000 ford mustang gt convertible 2004 ford lightning truck 2001 ford mustang/cobra 2008 ford f-350 4x4 truck

October 29th, 2006, 07:38 PM	#6
Boomer Enthusiast Join Date: Oct 2006 Location: warren, Mi Posts: 781	Check to see if the filter element is real oily, if it is, clean the MAF you may have oil in it causing a misread after the car warms up. Seen it a few dozen times with K&N filters and a few others as well. Also on a a note built54 is correct the engine needs to be hot and the factory tune is set to run better at 190* than it will at 160* without proper tuning. The factory setting allows more fuel and less timing in closed loop(cold) and at the proper temp returns to open loop adding timing and leaning the A/F . Colder is not better , even tuned you'll see maybe 1-2 rwhp on a dyno. __________________ Just another 10 second Mustang, what did you expect ? http://youtube.com/watch?v=BgykaUrmfvM

October 29th, 2006, 05:21 PM	#4
built54 Regular Join Date: Oct 2006 Posts: 78	Well to a limit... The engine has to be so hot, or it will burn excessive fuel, and not run its best

October 30th, 2006, 02:33 AM	#7
sctravis77 Newbie Join Date: Aug 2006 Location: Sumter, Sc Posts: 32	K&N My 95 GT did that shortly after washing my K&N filter. I used an electrical cleaner and sprayed the MAF screen and it worked fine.

October 30th, 2006, 11:27 AM	#8
twinturbo Regular Join Date: Sep 2006 Posts: 60	Based on symptoms, and the temp ranges you describe, sounds lean to me. You switch from one fuel table(based on a high or low temp range) to another at a certian point. The low temp range is a bit richer, so I'd be looking for what is modified on your car that could make it too lean. (maf?) The mention of spark plugs is also valid, as leaner mixtures require more spark energy, and you see the cause and effect here. I run .050 gap on these cars, normally-aspirated(more than .060" is too large a gap to me) HTH

October 30th, 2006, 02:27 PM	#10
Boomer Enthusiast Join Date: Oct 2006 Location: warren, Mi Posts: 781	Thats funny, our dyno showed 2 rwhp peak. Well whatever not going to argue, my point was if you do it get it tuned or it is a waste. __________________ Just another 10 second Mustang, what did you expect ? http://youtube.com/watch?v=BgykaUrmfvM

October 30th, 2006, 05:48 PM	#11
mjkids Enthusiast Join Date: Oct 2006 Location: ct Posts: 710	all mustang run different from owning four mustang 1979, 1985, 1988, 2000, thats what make mustang one of the best cars for bolt ons __________________ 2000 ford mustang gt convertible 2004 ford lightning truck 2001 ford mustang/cobra 2008 ford f-350 4x4 truck

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