Running lean????? need input!

stang98piswap · February 3rd, 2010, 11:12 PM

hey guys i need help this is what i got... just put a new intake set up on... ported c&l upper plenum, ported 70mm throttle body, 80 mm mass air meter, and cold air intake... seems i lost power over stock now it bogs down whenever i try to get on it... heres my thoughts would a diablosport tuner slove my seemingly air fuel ratio problems???

sharkbait · February 3rd, 2010, 11:27 PM

Now was this new mass air tuned? If not thats your issue right there. The tuner would help you out aslong as you can get a tune for your new 80mm mass air.

stang98piswap · February 3rd, 2010, 11:42 PM

well the car came with the maf and ran much better before i put the t/b plenum set up on last week.. it seems to be getting worse as the days go on...

stang98piswap · February 3rd, 2010, 11:44 PM

how does one tune for his maf??

sharkbait · February 3rd, 2010, 11:46 PM

First how do you know its running lean?

Also check for vacum leaks. Use your hands and look around for leaks around the work you just did. Thos modes should of cause you to run lean. Maybe somethings lose and its sucking in air and bypassing your maf...which causes you to run lean.

With a tuner you can add some fuel to your mixture.

stang98piswap · February 4th, 2010, 12:00 AM

my check engine light came on two codes came up maf something or other basically vacuum or too much air i guess.

sharkbait · February 4th, 2010, 12:16 AM

Ok so check for vacum leaks, its the cheapest alternative. You really shouldnt have any MAF problems if it worked before. Which leads me to believe its a vacuum leak.

You can tune your MAF meter. You can will probobly need a tune emailed to you or have your car dyno tuned if you want to go that far. But i think if yours ran great then you dont need any of that

stang98piswap · February 8th, 2010, 02:35 AM

changed my tps and iac motor seemed to almost solve the problem

Thumbie · February 8th, 2010, 03:00 AM

just getting a cold air kit and a new catback will require a tune. a dyno tune is your best bet

sharkbait · February 8th, 2010, 09:07 AM

Originally Posted by Thumbie

just getting a cold air kit and a new catback will require a tune. a dyno tune is your best bet

What? No it dosnt!

Also correction to my last post. You can tune your ECU to compensate for the MAF. You need special equipment to tune them

98FireyGT! · February 8th, 2010, 04:44 PM

Originally Posted by Thumbie

just getting a cold air kit and a new catback will require a tune. a dyno tune is your best bet

If you say so...

stang98piswap · February 8th, 2010, 07:49 PM

i was wondering about a diablosport preditor... can you get a dyno tune and use that to program the ecu???? also i just ordered msd coils and those e3 spark plugs

98FireyGT! · February 9th, 2010, 03:34 AM

Sure can, but check with your tuner before you order it, they might use the SCT, and that'd suck to buy a tuner you don't need lol.

Thumbie · February 9th, 2010, 04:03 AM

naw I was reading about this in like Popular Mechanics. the computer on the car tested could handle a cold air, or exhaust, but when both were put on the computer needed slight adjustment to MAXIMIZE the increase in flowrate. In otherwords, the computer had to be tuned to fully utilize them correctly. I mean, we're talking gains of like 5 hp anyways...

stang98piswap · February 9th, 2010, 04:18 AM

well that kind of explains my troubles... i have custom exhaust too... next step tuner then headers... msd is in the mail

Steelsoldi3r · February 9th, 2010, 10:10 PM

What kind of tuner would be best and for a desent price? where can i find cheap ones?

stang98piswap · February 10th, 2010, 07:41 PM

i found the diablosport for 282 at rpmoutlet.com... i have two dynos close to me... one uses sct the other diablo... guess i'm lucky to have my choice

sharkbait · February 10th, 2010, 09:44 PM

Steel you dont want the cheapest tuner. Its one of those things that you dont want to skimp on.

Getting a bad tune can blow your engine... so just get a nice one like diablo or SCT.

Before you go out spending all this money. Try cleaning your MAF sensor. the can cost 6 bux at auto zone. its says Mass Airflow cleaner. Then check all your hoses. Really a tune/tuner is a little far for your mods.

February 3rd, 2010, 11:12 PM	#1
stang98piswap Regular 1998 mustang gt Join Date: Nov 2009 Location: tampa florida Posts: 131 iTrader: 0 reviews	Running lean????? need input! hey guys i need help this is what i got... just put a new intake set up on... ported c&l upper plenum, ported 70mm throttle body, 80 mm mass air meter, and cold air intake... seems i lost power over stock now it bogs down whenever i try to get on it... heres my thoughts would a diablosport tuner slove my seemingly air fuel ratio problems???

February 3rd, 2010, 11:27 PM	#2
sharkbait Hooo Ha Ha 1997 Mustang GT 11.99 @ 113.9mph Join Date: Apr 2009 Location: Pasadena MD Posts: 9,630 iTrader: 9 reviews	Now was this new mass air tuned? If not thats your issue right there. The tuner would help you out aslong as you can get a tune for your new 80mm mass air. __________________ 374rwhp 456rwtq @ 8psi

February 3rd, 2010, 11:46 PM	#5
sharkbait Hooo Ha Ha 1997 Mustang GT 11.99 @ 113.9mph Join Date: Apr 2009 Location: Pasadena MD Posts: 9,630 iTrader: 9 reviews	First how do you know its running lean? Also check for vacum leaks. Use your hands and look around for leaks around the work you just did. Thos modes should of cause you to run lean. Maybe somethings lose and its sucking in air and bypassing your maf...which causes you to run lean. With a tuner you can add some fuel to your mixture. __________________ 374rwhp 456rwtq @ 8psi

February 4th, 2010, 12:16 AM	#7
sharkbait Hooo Ha Ha 1997 Mustang GT 11.99 @ 113.9mph Join Date: Apr 2009 Location: Pasadena MD Posts: 9,630 iTrader: 9 reviews	Ok so check for vacum leaks, its the cheapest alternative. You really shouldnt have any MAF problems if it worked before. Which leads me to believe its a vacuum leak. You can tune your MAF meter. You can will probobly need a tune emailed to you or have your car dyno tuned if you want to go that far. But i think if yours ran great then you dont need any of that __________________ 374rwhp 456rwtq @ 8psi

February 8th, 2010, 03:00 AM	#9
Thumbie Hardcore Enthusiast 2001 Cobra 14.2@102 (I suck) Join Date: Apr 2009 Location: SF Bay Area, CA Posts: 1,621 iTrader: 0 reviews	just getting a cold air kit and a new catback will require a tune. a dyno tune is your best bet __________________ 2001 Cobra with SRA swap, modded for twisties MM Cobra Club Member #76

February 3rd, 2010, 11:42 PM	#3
stang98piswap Regular 1998 mustang gt Join Date: Nov 2009 Location: tampa florida Posts: 131 iTrader: 0 reviews	well the car came with the maf and ran much better before i put the t/b plenum set up on last week.. it seems to be getting worse as the days go on...

February 3rd, 2010, 11:44 PM	#4
stang98piswap Regular 1998 mustang gt Join Date: Nov 2009 Location: tampa florida Posts: 131 iTrader: 0 reviews	how does one tune for his maf??

February 4th, 2010, 12:00 AM	#6
stang98piswap Regular 1998 mustang gt Join Date: Nov 2009 Location: tampa florida Posts: 131 iTrader: 0 reviews	my check engine light came on two codes came up maf something or other basically vacuum or too much air i guess.

February 8th, 2010, 02:35 AM	#8
stang98piswap Regular 1998 mustang gt Join Date: Nov 2009 Location: tampa florida Posts: 131 iTrader: 0 reviews	changed my tps and iac motor seemed to almost solve the problem

February 8th, 2010, 07:49 PM	#12
stang98piswap Regular 1998 mustang gt Join Date: Nov 2009 Location: tampa florida Posts: 131 iTrader: 0 reviews	i was wondering about a diablosport preditor... can you get a dyno tune and use that to program the ecu???? also i just ordered msd coils and those e3 spark plugs

February 9th, 2010, 03:34 AM	#13
98FireyGT! Hardon Enflooziast '94 GT Vert Havn't tried... Join Date: Oct 2009 Location: Spokane Posts: 3,360 iTrader: 0 reviews	Sure can, but check with your tuner before you order it, they might use the SCT, and that'd suck to buy a tuner you don't need lol. __________________ Bridget: 98 Mustang GT - PI Swapped, J-Mod and B&M Shifter...wrapped it around a tree sparing a deer - RIP Sephie: 94 Mustang GT Vert - Full 03 cobra suspension and brakes, Magnaflow catback, K&N drop in filter, timed at 12*, SS brake lines,

February 9th, 2010, 04:03 AM	#14
Thumbie Hardcore Enthusiast 2001 Cobra 14.2@102 (I suck) Join Date: Apr 2009 Location: SF Bay Area, CA Posts: 1,621 iTrader: 0 reviews	naw I was reading about this in like Popular Mechanics. the computer on the car tested could handle a cold air, or exhaust, but when both were put on the computer needed slight adjustment to MAXIMIZE the increase in flowrate. In otherwords, the computer had to be tuned to fully utilize them correctly. I mean, we're talking gains of like 5 hp anyways... __________________ 2001 Cobra with SRA swap, modded for twisties MM Cobra Club Member #76

February 9th, 2010, 04:18 AM	#15
stang98piswap Regular 1998 mustang gt Join Date: Nov 2009 Location: tampa florida Posts: 131 iTrader: 0 reviews	well that kind of explains my troubles... i have custom exhaust too... next step tuner then headers... msd is in the mail

February 9th, 2010, 10:10 PM	#16
Steelsoldi3r Regular 1996 Mustang GT Join Date: Jan 2010 Location: Deer Park, Texas Posts: 257 iTrader: 0 reviews	What kind of tuner would be best and for a desent price? where can i find cheap ones? __________________ 3.55 gears, Cai, magnaflow exhaust, advanced timing to 12 degrees,underdrive pullies, throttle body spacer, plenum intake spacer, BBK o/r H-pipe, king cobra clutch....havent gone to the dyno, more to come

February 10th, 2010, 07:41 PM	#17
stang98piswap Regular 1998 mustang gt Join Date: Nov 2009 Location: tampa florida Posts: 131 iTrader: 0 reviews	i found the diablosport for 282 at rpmoutlet.com... i have two dynos close to me... one uses sct the other diablo... guess i'm lucky to have my choice

February 10th, 2010, 09:44 PM	#18
sharkbait Hooo Ha Ha 1997 Mustang GT 11.99 @ 113.9mph Join Date: Apr 2009 Location: Pasadena MD Posts: 9,630 iTrader: 9 reviews	Steel you dont want the cheapest tuner. Its one of those things that you dont want to skimp on. Getting a bad tune can blow your engine... so just get a nice one like diablo or SCT. Before you go out spending all this money. Try cleaning your MAF sensor. the can cost 6 bux at auto zone. its says Mass Airflow cleaner. Then check all your hoses. Really a tune/tuner is a little far for your mods. __________________ 374rwhp 456rwtq @ 8psi

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