running lean and pcm?s

wewfords · Feb 2, 2011

i have 89 fox 5.0 a/t that is running very lean where the plugs look new but i adj tpms to run a little rich and i smell rich @ idle i due not know what all the has been done to the beside 42lbs injectors, stock intake, headers, 65mm tb and a 73mm mass air tube w/ stock mass senor and im running about 38psi on fuel and there is no codes nor check engine light and hwats the deal w/the 9al pcmsthat i here all about?

90stang5speed · Feb 3, 2011

A9L was the EEC from a manual trans car. You probably have the A9P if its a factory auto trans car. I dont know much about the bigger MAF tube but with a stock MAF sensor. That might some how calibrate the MAF for the 42's but, If you dont have away to let the EEC know those 42 lb injectors are in there, its going to run real rich as the EEC will think you have 19 lb injectors. Your post said its runing lean but smells rich. How do you know its lean? do you have an air/fuel ratio gauge?

jrichker · Feb 3, 2011

Smell at idle with cars that have no catalytic converters is normal. That stink is the pollutants that are normally borken down by the catalytic converters. What mods do you have that need 42 pound injectors?

Adjust tpms? Did you mean the TPS sensor on the throttle body? Adjusting the TPS does nothing. See the sticky at the top of the 5.0 Tech forum http://www.stangnet.com/mustang-forums/825424-adjusting-your-tps-0-98v-not-necessary.html

izak · Feb 3, 2011

90stang5speed said it. Your MAF meter needs to be calibrated for your 42lbs. thats if your MAF can be calibrated, if not then you will need to buy a 73mm MAF meter calibrated for 42lbs. But jrichker said what mods have you done that deserve you to run 42lbs? you might be overkill.

vristang · Feb 3, 2011

wewfords said:
i have 89 fox 5.0 a/t that is running very lean where the plugs look new but i adj tpms to run a little rich and i smell rich @ idle i due not know what all the has been done to the beside 42lbs injectors, stock intake, headers, 65mm tb and a 73mm mass air tube w/ stock mass senor and im running about 38psi on fuel and there is no codes nor check engine light and hwats the deal w/the 9al pcmsthat i here all about?

73mm is C&L, correct?
What sample tube are you running?

what is "tpms"?

2000xp8 · Feb 4, 2011

42lb injectors for a stock engine is wayyyyyy too much.
Simple solution, put the stock meter and 19lb injectors back in.
If you don't have the stock meter, find a 75mm bullet for 19's on ebay.

Unless you have a supercharger on the car right now that you aren't telling us about, your injector setup is completely wrong.
And that 73mm mass air meter is a POS, they are nothing but trouble.

wewfords · Feb 4, 2011

i mean tps not tpms and the spark plugs are ghost white and these mods where done to the car when i got it try to get it all tune in right i been reading that adj the tps can rich or lean out the fuel some i dont know all the specs of what been done to it my plan is to put a 347 or a 306 in it with e-303 rollor rockers and some head work and intake any recmondations on what intake should i use

jrichker · Feb 5, 2011

Trying to adjust the TPS has no effect, no matter what you heard or were you heard it. . See http://www.stangnet.com/mustang-forums/825424-adjusting-your-tps-0-98v-not-necessary.html.

The computer zeros out the TPS input everytime the engine is started, making whatever voltage reading that it sees the zero starting point. It looks at the increase between the starting point and the current position to determine how far the throttle is open.

Mustang5L5 · Feb 5, 2011

wewfords said:
i been reading that adj the tps can rich or lean out the fuel some

It doesn't. You are trying to band-aid a problem rather than find the root cause.

A stock engine with 42 pound injectors is very odd. You sure they are 42s? I would think this car had a supercharger on it before the sale if it does have 42s

I would take them off. Buy some 19s and a stock maf cheap and install. Get the car running well, then focus on mods.

I would also run the check engine codes.

2000xp8 · Feb 5, 2011

Mustang5L5 said:
It doesn't. You are trying to band-aid a problem rather than find the root cause.

A stock engine with 42 pound injectors is very odd. You sure they are 42s? I would think this car had a supercharger on it before the sale if it does have 42s

I would take them off. Buy some 19s and a stock maf cheap and install. Get the car running well, then focus on mods.

I would also run the check engine codes.

Yup, don't worry about mods, get the car right first or you will never be able to trouble shoot it.
19's and a stock meter to start, i'll bet your problems go away.
Even if you had a 347 42's are still too way too much.
42's are for guys with superchargers making in excess of 400rwhp, you are probably at half that.

90stang5speed · Feb 5, 2011

While stock injectors & stock maf would simplify things, I wouldnt want to go out and buy stock injectors & MAF, only to swap them out again when you build a bigger engine that needs more fuel. Ford lightnings come with 42's. Yes, they are supercharged but, they have to idle & do light cruise too. They dont NEED the 42's then. with the plugs being white, Have you checked for vac leaks. I just ran into that today. I went to start mine and it would barely run. It turns out that a metal tube on the intake had been broken off some how & I had about a 3/8 hole sucking air.

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