car lean..need to trick it to run rich

chadjones99 · November 29th, 2006, 08:43 PM

Hello, what is the easiest way to trick my 86 gt 5.0 (with MAF CONV) to run rich all the time.
I had a problem with my O2's and they are hooked up, but for what ever reason my car is running lean in till about 3/4 throttle . then it goes full rich and runs great. I am not worried about mileage I just want it to run rich all the time. as this is safer in till I find out why it is running lean.
I have heard that jumping a wire or doing a disconnect on the water temp wire will default it to run rich, what about just unplugging the O2 plugs or do I have to jumper them to make it think it is lean and to go rich ?
thanks

stang fanatic · November 29th, 2006, 09:50 PM

break your intake temp sensor so it reads a default cold reading

stang fanatic · November 29th, 2006, 09:51 PM

have you hooked up a reader to see what codes you might have stored nd what sensors are reading? if the intake is reading hot, itll lean you out

HMUSN · November 29th, 2006, 09:52 PM

just drop some 42's in.
you'll never run lean again

chadjones99 · November 29th, 2006, 10:05 PM

no codes on intake just left bank. i had 24 in but have dropped back to the 19 lb ers
so unhook the intake sensor ? pull it out , etc

chadjones99 · November 29th, 2006, 10:31 PM

so do i pull it out.. or just unplug it ? also what will happen if i unplug my o2 sensors ?

TENGRAM · November 30th, 2006, 02:22 AM

Originally Posted by chadjones99

no codes on intake just left bank. i had 24 in but have dropped back to the 19 lb ers
so unhook the intake sensor ? pull it out , etc

...what code did you get? did you do the cylinder balance test? possible you are just running lean on one cylinder...if thats the case i would suspect the injector is stuck closed. really its gonna be a good idea to figure out whats actually the problem, rather than trying to trick the ECM...if it is an injector stuck, "breaking" your ACT won't fix it.

chadjones99 · November 30th, 2006, 11:06 PM

balance test ran fine.... and i have tested all injectors my self by hand with a 9volt batt..they work

Modified88Dreamer · December 4th, 2006, 01:33 AM

Originally Posted by chadjones99

i had 24 in but have dropped back to the 19 lb ers

Can I ask why you did that?

TENGRAM · December 4th, 2006, 01:36 AM

Originally Posted by Modified88Dreamer

Originally Posted by chadjones99

i had 24 in but have dropped back to the 19 lb ers

Can I ask why you did that?

good question.

chad, if you didn't recalibrate your maf for the 19lbers than that is likely your problem. that would definitely cause it to run lean

1slo5.0 · December 4th, 2006, 01:36 AM

Do you have the right Mass Air Sensor for your injectors?

chadjones99 · December 4th, 2006, 01:10 PM

I have a C&L Mass Air meter and both tubes for it
the 19lb cal tube and the 24 lb cal tube. it does run right as far as that goes because one of the times i did forget to put the other tube in and it ran like crape intill i put the right one in

TENGRAM · December 4th, 2006, 03:17 PM

if you want to verify that you have the right tube in (because they're different for 73mm vs 76mm) check THIS CHART

chadjones99 · December 4th, 2006, 09:48 PM

yes u have the right tube .. and by the way cool chart could come in handy.
the car runs good.. i just think it is running a little lean and would like to trick it out to run rich , just so i could test it
thanks
all

stang fanatic · December 7th, 2006, 01:05 AM

if youre a computer guru...start researching resistence readings of the ait sensor, find a resistor from radio shack and install it across the 2 wires so the comp reads cold intake air temps

TENGRAM · December 7th, 2006, 01:49 AM

Originally Posted by stang fanatic

if youre a computer guru...start researching resistence readings of the ait sensor, find a resistor from radio shack and install it across the 2 wires so the comp reads cold intake air temps

might want to be careful if you try that...if the "ait" (ACT) reads too cold of a temp, it'll pull out 2 degrees of timing at least. if the ACT reads too hot it will lean the mixture out. there's some good middle ground to work with though, that won't affect timing and will enrichen the fuel mixture.

chadjones99 · December 7th, 2006, 08:27 PM

what about just unplugging the o2's

TENGRAM · December 7th, 2006, 09:51 PM

Originally Posted by chadjones99

what about just unplugging the o2's

yep that'll work, thats what i do. be safe though and keep fuel pressure above 38psi. you don't want to run lean. also if you just disconnect the o2s from the harness, leaving them in your exhaust will ruin them since the o2's heater won't burn excess fuel off of them and they will get clogged. best idea is to get plugs for the o2 holes, and put your o2s in a box or something to keep them in good condition.

chadjones99 · December 7th, 2006, 10:28 PM

ok, unplug the O2's , and put in box, i have my fuel set at 42 right now.
why would just unplugging the O2 make it run lean ? you said set fuel above 38 ?
I will put some type of plug in the O2 holes. So this should make it run rich all the time right ?
thanks

TENGRAM · December 7th, 2006, 11:10 PM

Originally Posted by chadjones99

ok, unplug the O2's , and put in box, i have my fuel set at 42 right now.
why would just unplugging the O2 make it run lean ? you said set fuel above 38 ?
I will put some type of plug in the O2 holes. So this should make it run rich all the time right ?
thanks

yes rich always at 42psi...assuming you reset the computer by disconnecting the battery for 10-15 minutes...otherwise it'll still remember the 42 psi from before you disconnected the o2s. that is, unless you upped the fuel pressure after removing the o2s. BTW, just unplugging the o2s won't make it run lean, i was just meaning that you shouldn't lower the pressure afterwards, otherwise...

November 29th, 2006, 08:43 PM	#1
chadjones99 Regular Join Date: Aug 2006 Location: Tonopah,az Posts: 86 iTrader: 0 reviews	car lean..need to trick it to run rich Hello, what is the easiest way to trick my 86 gt 5.0 (with MAF CONV) to run rich all the time. I had a problem with my O2's and they are hooked up, but for what ever reason my car is running lean in till about 3/4 throttle . then it goes full rich and runs great. I am not worried about mileage I just want it to run rich all the time. as this is safer in till I find out why it is running lean. I have heard that jumping a wire or doing a disconnect on the water temp wire will default it to run rich, what about just unplugging the O2 plugs or do I have to jumper them to make it think it is lean and to go rich ? thanks __________________ 1986 stang ,Edelbrook intake, aluminum heads, E303 cam ,70 MM throttle body ,24lb injectors ,373 gears , 10:1 pistons set up,no cats , flowmaster mufflers , short shifter , 255 fuel pump , smog pump delete , A/C delete , Aluminum Radiator , MAF convertion

November 29th, 2006, 09:50 PM	#2
stang fanatic Enthusiast Join Date: May 2006 Location: El Paso, Tx Posts: 855 iTrader: 0 reviews	break your intake temp sensor so it reads a default cold reading __________________ "The gods too are fond of a joke." "If I had only known, I would have been a locksmith. "

November 29th, 2006, 09:51 PM	#3
stang fanatic Enthusiast Join Date: May 2006 Location: El Paso, Tx Posts: 855 iTrader: 0 reviews	have you hooked up a reader to see what codes you might have stored nd what sensors are reading? if the intake is reading hot, itll lean you out __________________ "The gods too are fond of a joke." "If I had only known, I would have been a locksmith. "

November 29th, 2006, 09:52 PM	#4
HMUSN Doc 1986 SVO Join Date: Nov 2006 Posts: 36,836 iTrader: 9 reviews	just drop some 42's in. you'll never run lean again __________________

November 29th, 2006, 10:05 PM	#5
chadjones99 Regular Join Date: Aug 2006 Location: Tonopah,az Posts: 86 iTrader: 0 reviews	no codes on intake just left bank. i had 24 in but have dropped back to the 19 lb ers so unhook the intake sensor ? pull it out , etc __________________ 1986 stang ,Edelbrook intake, aluminum heads, E303 cam ,70 MM throttle body ,24lb injectors ,373 gears , 10:1 pistons set up,no cats , flowmaster mufflers , short shifter , 255 fuel pump , smog pump delete , A/C delete , Aluminum Radiator , MAF convertion

car lean..need to trick it to run rich

car lean..need to trick it to run rich

NO O2"s

Re: NO O2"s

November 29th, 2006, 10:31 PM	#6
chadjones99 Regular Join Date: Aug 2006 Location: Tonopah,az Posts: 86 iTrader: 0 reviews	so do i pull it out.. or just unplug it ? also what will happen if i unplug my o2 sensors ? __________________ 1986 stang ,Edelbrook intake, aluminum heads, E303 cam ,70 MM throttle body ,24lb injectors ,373 gears , 10:1 pistons set up,no cats , flowmaster mufflers , short shifter , 255 fuel pump , smog pump delete , A/C delete , Aluminum Radiator , MAF convertion

November 30th, 2006, 11:06 PM	#8
chadjones99 Regular Join Date: Aug 2006 Location: Tonopah,az Posts: 86 iTrader: 0 reviews	balance test ran fine.... and i have tested all injectors my self by hand with a 9volt batt..they work __________________ 1986 stang ,Edelbrook intake, aluminum heads, E303 cam ,70 MM throttle body ,24lb injectors ,373 gears , 10:1 pistons set up,no cats , flowmaster mufflers , short shifter , 255 fuel pump , smog pump delete , A/C delete , Aluminum Radiator , MAF convertion

December 4th, 2006, 01:36 AM	#11
1slo5.0 MM Ninjas! 1990 Mustang LX 9.36@143 mph Join Date: Jan 2006 Location: North Fond du Lac, Wisconsin Posts: 11,375 iTrader: 1 reviews	Do you have the right Mass Air Sensor for your injectors? __________________ My daily driver has 16 cylinders and 4400hp @ 1000 rpm.... ***1988 Mustang GT - Stock....almost

December 4th, 2006, 01:10 PM	#12
chadjones99 Regular Join Date: Aug 2006 Location: Tonopah,az Posts: 86 iTrader: 0 reviews	I have a C&L Mass Air meter and both tubes for it the 19lb cal tube and the 24 lb cal tube. it does run right as far as that goes because one of the times i did forget to put the other tube in and it ran like crape intill i put the right one in __________________ 1986 stang ,Edelbrook intake, aluminum heads, E303 cam ,70 MM throttle body ,24lb injectors ,373 gears , 10:1 pistons set up,no cats , flowmaster mufflers , short shifter , 255 fuel pump , smog pump delete , A/C delete , Aluminum Radiator , MAF convertion

December 4th, 2006, 03:17 PM	#13
TENGRAM Hardcore Enthusiast Join Date: Jun 2006 Posts: 1,027 iTrader: 0 reviews	if you want to verify that you have the right tube in (because they're different for 73mm vs 76mm) check THIS CHART __________________ 89 GT t5 3.73 www.my5oh.com/

December 4th, 2006, 09:48 PM	#14
chadjones99 Regular Join Date: Aug 2006 Location: Tonopah,az Posts: 86 iTrader: 0 reviews	yes u have the right tube .. and by the way cool chart could come in handy. the car runs good.. i just think it is running a little lean and would like to trick it out to run rich , just so i could test it thanks all __________________ 1986 stang ,Edelbrook intake, aluminum heads, E303 cam ,70 MM throttle body ,24lb injectors ,373 gears , 10:1 pistons set up,no cats , flowmaster mufflers , short shifter , 255 fuel pump , smog pump delete , A/C delete , Aluminum Radiator , MAF convertion

December 7th, 2006, 01:05 AM	#15
stang fanatic Enthusiast Join Date: May 2006 Location: El Paso, Tx Posts: 855 iTrader: 0 reviews	if youre a computer guru...start researching resistence readings of the ait sensor, find a resistor from radio shack and install it across the 2 wires so the comp reads cold intake air temps __________________ "The gods too are fond of a joke." "If I had only known, I would have been a locksmith. "

December 7th, 2006, 08:27 PM	#17
chadjones99 Regular Join Date: Aug 2006 Location: Tonopah,az Posts: 86 iTrader: 0 reviews	what about just unplugging the o2's __________________ 1986 stang ,Edelbrook intake, aluminum heads, E303 cam ,70 MM throttle body ,24lb injectors ,373 gears , 10:1 pistons set up,no cats , flowmaster mufflers , short shifter , 255 fuel pump , smog pump delete , A/C delete , Aluminum Radiator , MAF convertion

December 7th, 2006, 10:28 PM	#19
chadjones99 Regular Join Date: Aug 2006 Location: Tonopah,az Posts: 86 iTrader: 0 reviews	NO O2"s ok, unplug the O2's , and put in box, i have my fuel set at 42 right now. why would just unplugging the O2 make it run lean ? you said set fuel above 38 ? I will put some type of plug in the O2 holes. So this should make it run rich all the time right ? thanks __________________ 1986 stang ,Edelbrook intake, aluminum heads, E303 cam ,70 MM throttle body ,24lb injectors ,373 gears , 10:1 pistons set up,no cats , flowmaster mufflers , short shifter , 255 fuel pump , smog pump delete , A/C delete , Aluminum Radiator , MAF convertion

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