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5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

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Old 05-22-2013, 06:13 AM   #1
GTnotchback
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Default running super rich. limp mode?

For a long time now I cant figure out why my car is running so rich (cant even drive it). Im guessing from all the reading ive done on here that the fuel system is in limp mode. Im also guessing now that it is the fault of the c&l mass air meter sensor or the coolant temp sensor.(it has 2 right?) Is there a way to test these to see if they are good or not? 2 years ago i had idle issues with the new stroker motor so i had a chip burnt for it. The new chip fixed the idle and made the car run very good. Then all of the sudden one day it just started running like it is currently.Very rich and like garbadge, cant drive it.
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347 stroker 10:1 compression
new FMS-M6010BOSS302 block .060
Eagle crank
Lunati rods
Mahle flattop pistons, file fit rings
Comp cams 35-518-8 Extreme Energy cam 0 deg ret.
Heads port/polish double springs 1.92/1.60 valves
holley systemax upper/lower intake
1/5/8 long tube headers
30# injectors
150hp shot of nitrous
4:10 rearend
Diablosport CMR custom chip
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Old 05-22-2013, 08:12 AM   #2
88 orangepeel notch
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Default

Yes there is a way to check them, use the search and you'll find it. I can't remember the specifics but it you'll be measuring volts at different temps, there was a chart on that thread that showed what it should be reading at a certain temp. Also there are 2 temp sensors, but the one on the drivers side of intake only runs the gauge, the one on passenger side is the one the the computer uses.
Your problem seems alittle more serious than a faulty temp switch thou. That's gotta be pushing black smoke out the exhaust pretty bad to not even run. Have you pulled codes? That will tell if the computer thinks the temp switch is bad.

Last edited by 88 orangepeel notch; 05-22-2013 at 08:15 AM.
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Old 05-22-2013, 08:54 AM   #3
GTnotchback
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found it here:
http://mustangforums.com/forum/5-0l-...y-mattdel.html
thanks ill try this tonight. ya is smells terrible rich and puts dark marks on the cement where the mufflers dump. thats how rich it is.
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347 stroker 10:1 compression
new FMS-M6010BOSS302 block .060
Eagle crank
Lunati rods
Mahle flattop pistons, file fit rings
Comp cams 35-518-8 Extreme Energy cam 0 deg ret.
Heads port/polish double springs 1.92/1.60 valves
holley systemax upper/lower intake
1/5/8 long tube headers
30# injectors
150hp shot of nitrous
4:10 rearend
Diablosport CMR custom chip
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Old 05-22-2013, 04:07 PM   #4
lxman1
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You may have a bad injector driver in your ecm. Check the injector pulse with a noid light. I have had a couple of Ford ecm's that had a bad driver and held the injector wide open.
Both were 94 models, but it is worth checking. Noid lights are cheap at Autozone.
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Old 05-22-2013, 06:14 PM   #5
GTnotchback
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Quote:
Originally Posted by lxman1 View Post
You may have a bad injector driver in your ecm. Check the injector pulse with a noid light. I have had a couple of Ford ecm's that had a bad driver and held the injector wide open.
Both were 94 models, but it is worth checking. Noid lights are cheap at Autozone.
ok this is somthing new to try i havnt done yet. I will look into this. Sometimes it seems to clear up and run great. Did it to me tonight. Then 5 mins later its pig rich again and giving me a headache the fumes are so bad. And yes i have the garage door open.
Most of the night tonight i had to keep foot on the gas or it would stall out.Seems to run a little different day to day but usually always rich and usually will idle fairly well.
coolant temp sensor:
key on harness is supplying 4.62 volts
sensor its self has 13.17 ohms just touching its two connections
key on and sensor plugged in: 3.39 mohms and -1.97 volts.
__________________
347 stroker 10:1 compression
new FMS-M6010BOSS302 block .060
Eagle crank
Lunati rods
Mahle flattop pistons, file fit rings
Comp cams 35-518-8 Extreme Energy cam 0 deg ret.
Heads port/polish double springs 1.92/1.60 valves
holley systemax upper/lower intake
1/5/8 long tube headers
30# injectors
150hp shot of nitrous
4:10 rearend
Diablosport CMR custom chip

Last edited by GTnotchback; 05-22-2013 at 06:21 PM.
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Old 05-22-2013, 06:22 PM   #6
GTnotchback
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also key on tps voltage reads 5.01 volts touching the orange and black wire.
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347 stroker 10:1 compression
new FMS-M6010BOSS302 block .060
Eagle crank
Lunati rods
Mahle flattop pistons, file fit rings
Comp cams 35-518-8 Extreme Energy cam 0 deg ret.
Heads port/polish double springs 1.92/1.60 valves
holley systemax upper/lower intake
1/5/8 long tube headers
30# injectors
150hp shot of nitrous
4:10 rearend
Diablosport CMR custom chip
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Old 05-23-2013, 05:36 PM   #7
GTnotchback
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THIS THREAD IS CONCLUDED.Thanks for your help. I found the problem to be the wrong mass air sensor and meter combo. way off. Its explained in my other thread. thanks
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347 stroker 10:1 compression
new FMS-M6010BOSS302 block .060
Eagle crank
Lunati rods
Mahle flattop pistons, file fit rings
Comp cams 35-518-8 Extreme Energy cam 0 deg ret.
Heads port/polish double springs 1.92/1.60 valves
holley systemax upper/lower intake
1/5/8 long tube headers
30# injectors
150hp shot of nitrous
4:10 rearend
Diablosport CMR custom chip
GTnotchback is offline   Reply With Quote
Old 05-23-2013, 05:36 PM
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