Help 1997 5.4
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Junior User
Joined: Sep 2007
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Help 1997 5.4
Recently got a 1997 f150 5.4. On the way home the car died.couldn't hear the pump prime or anything. got home read the codes cleared them and have driven a little bit. here are the codes what do people think they mean.
P0307: Cyl 7 Misfire Detected
P0135: O2 Heater Circuit (B1 S1)
P1131: Lack of HO2S11 Switches- Sensor indicates Lean
P0302: Misfire cyl 2
Today while driving it the check engine light started to flash. The cyl 2 misfire was the only new code.
Also after the car died iu checked fuel pressure when i got home. 28-30 PSI with vac attached and 38-40 PSI with vac detatched. after 5 min hold it was at 38 PSI.
If anyone wants more information i can try to get some more. I just want my truck to work.
P0307: Cyl 7 Misfire Detected
P0135: O2 Heater Circuit (B1 S1)
P1131: Lack of HO2S11 Switches- Sensor indicates Lean
P0302: Misfire cyl 2
Today while driving it the check engine light started to flash. The cyl 2 misfire was the only new code.
Also after the car died iu checked fuel pressure when i got home. 28-30 PSI with vac attached and 38-40 PSI with vac detatched. after 5 min hold it was at 38 PSI.
If anyone wants more information i can try to get some more. I just want my truck to work.
Elder User
Joined: Jan 2008
Posts: 589
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From: Stockton Ca.
How many miles on the truck and did the previous owner show you or better yet give you any receipts for repairs/maintenance done that show the mileage at the time the work was done?
I would start with the misfire codes, buy some Motorcraft plugs and change them unless you know this was done recently. Also check the line that runs from the PCV valve to the back of the intake, the rubber 90% boots deteriorate.
I would start with the misfire codes, buy some Motorcraft plugs and change them unless you know this was done recently. Also check the line that runs from the PCV valve to the back of the intake, the rubber 90% boots deteriorate.
Senior User
Joined: Nov 2004
Posts: 357
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From: Lancaster, PA
Freeze frame data holds all the answers.......you are chasing a problem blindly. P1131 is the code you want to pay attention to. That shows that the 02 sensor is not switching fast enough and is biased lean. I would say the misfire is an ignition failure more than likely. Does the scan tool you have provide freeze frame?
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Junior User
Joined: Sep 2007
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Freeze frame data holds all the answers.......you are chasing a problem blindly. P1131 is the code you want to pay attention to. That shows that the 02 sensor is not switching fast enough and is biased lean. I would say the misfire is an ignition failure more than likely. Does the scan tool you have provide freeze frame?
Senior User
Joined: Feb 2006
Posts: 265
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From: Candler, NC
Im working on a truck with the 1131 code. Its actually running so rich that it filled up the number 2 cyl and hydro locked the motor. Got it cleared out and running again and I had my autoenginuity hooked to it tonight and the bank 1 sensor 1 o2 sensor is not changing voltage at all. What voltage should that sensor be putting out?
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mds79
Explorer, Sport Trac, Mountaineer & Aviator
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Oct 6, 2008 12:02 AM
