318 TBI pig rich.
#964405
04/02/11 03:11 PM
04/02/11 03:11 PM
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Joined: Jan 2003
Posts: 4,588
St. John's Newfoundland
440newport
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OP
master
Joined: Jan 2003
Posts: 4,588
St. John's Newfoundland
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Can anyone help me out with my 90 W-150? The last couple of months it's been running PIG rich. The exhaust makes your eyes water and the mileage went from about 14mpg to about 4.
So far I've changed the fuel pressure regulator and temp sensor to no help. It seems to run a little less rich with the temp sensor unplugged but the idle is rough. The computer is fairly new and nothing seems to be missing or unplugged.
When it's running you can see fuel puddling on top of the throttle blades, and if you give it a shot of gas you get a big black cloud of smoke.
I have a new oxy sensor but I don't have the right tool to get the old one off. A regular wrench is no good, and there's no room for a deep socket. I don't want to just throw parts at it but I don't know these systems very well.
Codes are 12, 33, 45, 37, 22, 34, 51 and 55.
I also get code 17 if I unplug the temp sensor.
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Re: 318 TBI pig rich.
[Re: 440newport]
#964408
04/02/11 03:36 PM
04/02/11 03:36 PM
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Joined: Apr 2010
Posts: 10,570
Sunny South Florida
Golden-Arm
I Live Here
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I Live Here
Joined: Apr 2010
Posts: 10,570
Sunny South Florida
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Quote:
Codes are 12, 33, 45, 37, 22, 34, 51 and 55.
I also get code 17 if I unplug the temp sensor.
Code 12 The battery has been disconnected and the computer (ECU) has been reset. *will reset after multiple restarts of engine
Code 22 Coolant temperature sensor out of range
Code 33 A/C relay open or shorted. (may be in the wide-open-throttle cutoff circuit)
Code 34 (1987-1991) speed control shorted or open (speed control shorted or open) *or possibly wrong number if you dont have cruise.
Code 37 Baro-read solenoid open or shorted or
part throttle lock/unlock solenoid driver circuit
Code 45 Turbo boost limit exceeded (engine was shut down by logic module) *probably a wrong number, i doubt you have a turbo*
Code 51 Oxygen sensor stuck at lean position. It may be tripped by a bad MAP sensor system causing a rich condition, and the O2 sensor trying to compensate. The O2 sensor may still be good. The MAP assembly consists of two pieces, the valve and the vacuum transducer (round plastic unit with cylinder on top and both electrical and vacuum connections) - If you get hot rough idle and stalling, especially on deceleration, accompanied by flooded engine and difficulty restarting, that can be a bad MAP sensor causing the O2 sensor to try to compensate. If you get poor cold driveability, stumbling and bucking, and acceptable warm driving with poor gas mileage (a drop of 10 mpg or more), that is usually the O2 sensor.
Code 55 End of codes.
<<<Code 17 Coolant sensor not reporting more than 160° after 8 minutes of engine running *this is normal, if you have it disconnected
it seems that the Code 51 is your biggest problem right now. as mentioned, you can get a loaner socket to remove the sender. worst case scenario, buy a "SIM" box, to replace the O2. they are used when running headers, and bigger throttle body, to "trick" the computer. good luck.
"When Tyranny Becomes Law, Rebellion Becomes Duty"
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Re: 318 TBI pig rich.
[Re: 440newport]
#964410
04/02/11 03:45 PM
04/02/11 03:45 PM
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Joined: Jan 2003
Posts: 4,588
St. John's Newfoundland
440newport
OP
master
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OP
master
Joined: Jan 2003
Posts: 4,588
St. John's Newfoundland
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Quote:
Code 51 Oxygen sensor stuck at lean position. It may be tripped by a bad MAP sensor system causing a rich condition, and the O2 sensor trying to compensate. The O2 sensor may still be good. The MAP assembly consists of two pieces, the valve and the vacuum transducer (round plastic unit with cylinder on top and both electrical and vacuum connections) - If you get hot rough idle and stalling, especially on deceleration, accompanied by flooded engine and difficulty restarting, that can be a bad MAP sensor causing the O2 sensor to try to compensate. If you get poor cold driveability, stumbling and bucking, and acceptable warm driving with poor gas mileage (a drop of 10 mpg or more), that is usually the O2 sensor.
The thing is, it runs and drives pretty much perfectly. Occasionally it will stumble taking off from idle but other than it seems ok. I'll probably change the MAP then as well.
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Re: 318 TBI pig rich.
[Re: 440newport]
#964411
04/02/11 03:45 PM
04/02/11 03:45 PM
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Joined: Jan 2003
Posts: 18,426
UPPER MICHIGAN, MARQUETTE COUN...
NITROUSN
I Live Here
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I Live Here
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UPPER MICHIGAN, MARQUETTE COUN...
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Quote:
I know I'm hurting the rings. I just haven't had a chance to fix it yet. I changed the oil once since it started doing this, but it's been getting worse the last couple of weeks.
Is the transducer that vacuum pod thing attached to the EGR valve?
What is the fuel pressure? You need to know that first.
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Re: 318 TBI pig rich.
[Re: NITROUSN]
#964412
04/02/11 03:49 PM
04/02/11 03:49 PM
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Joined: Jan 2003
Posts: 4,588
St. John's Newfoundland
440newport
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OP
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Joined: Jan 2003
Posts: 4,588
St. John's Newfoundland
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Quote:
What is the fuel pressure? You need to know that first.
I don't know, I don't have a gauge that reads higher than 8 psi. Is there a place to tap into it or do I have to cut the line somewhere?
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Re: 318 TBI pig rich.
[Re: 440newport]
#964414
04/02/11 05:20 PM
04/02/11 05:20 PM
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Joined: Feb 2003
Posts: 415
Indiana
Pentastar440
mopar
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mopar
Joined: Feb 2003
Posts: 415
Indiana
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It is most likely the throttle position sensor. I had an '89 van with 318 and it done the same thing. I replaced the throttle position sensor and that fixed it.
'65 Belvedere II - 446-Indy,727 transbrake,Dana 4.56
'38 Plymouth 4Dr - 408SixPack, A518, Dana60 4:10
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Re: 318 TBI pig rich.
[Re: NITROUSN]
#964418
04/03/11 07:54 AM
04/03/11 07:54 AM
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Joined: Jan 2003
Posts: 21,080
Niles , Ohio
therocks
oh wait.but hey.lets see.oh yeah.
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oh wait.but hey.lets see.oh yeah.
Joined: Jan 2003
Posts: 21,080
Niles , Ohio
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Actually you need to have it scanned.A code reader wont tell you much except the codes.Id also say the coolant temp sensor is bad and causing the rich condition.It will make it run like a carbed car with the choke on.The temp sensors are cheap so Id replace it first.TPS if bad usually throws a code.Whats cheaper tossing parts and hoping to find whats wrong or spendind 70 bucks to have it diaged correctly?Seen too many people that wont spend $$$ to have it diaged but will spend hundreds trying to guess whats wrong.If the CTS is bad it will toss an O2 codes as its alwys rich.That and make sure the stat is correct.If not it will run rich also.Rocky
Last edited by therocks; 04/03/11 08:35 AM.
Chrysler Firepower
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Re: 318 TBI pig rich.
[Re: 440newport]
#964420
04/03/11 04:59 PM
04/03/11 04:59 PM
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Joined: Jan 2003
Posts: 21,080
Niles , Ohio
therocks
oh wait.but hey.lets see.oh yeah.
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oh wait.but hey.lets see.oh yeah.
Joined: Jan 2003
Posts: 21,080
Niles , Ohio
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f its throwing a temp sen code it still has a problem with it.Scanner can see what its doing.TPS Ill say wont do squat.It just tells the puter where the pedal is.Wont make it run rich.Rocky
Chrysler Firepower
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... you could be hurting the rings... 
