Help! Newbies 5.4L will not idle.
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Help! Newbies 5.4L will not idle.
I have a 1998 F150 5.4L with 144,000 miles on it. Went to start after work and a poof sound came from under the hood. I was able to get it started with alot of throttle and even limped home with it dying at every stop. When I got home I read the DTC's and they are.
P0156 - O2 Sensor Circuit Malfunction (Bank 2 Sensor 2)
P0136 - O2 Sensor Circuit Malfunction (Bank 2 Sensor 2)
P0102 - Mass or Volume Air Flow Circuit Low Input
P1151 - Lack Of HO2S-21 Switch Indicates Lean
P1131 - HO2S 11 Indicates Lean
Any ideas on where to start? Thanks in advance.
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P0156 - O2 Sensor Circuit Malfunction (Bank 2 Sensor 2)
P0136 - O2 Sensor Circuit Malfunction (Bank 2 Sensor 2)
P0102 - Mass or Volume Air Flow Circuit Low Input
P1151 - Lack Of HO2S-21 Switch Indicates Lean
P1131 - HO2S 11 Indicates Lean
Any ideas on where to start? Thanks in advance.
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Posting Guru
Joined: Oct 2005
Posts: 2,209
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From: Louisville, Kentucky
Hello arny and welcome to FTE. 
First of all, take a look under the hood for any signs of what went "poof". All of your codes indicate something is wrong in the intake system of your truck. Do you have a FIPK on your truck? Take a look at the MAF sensor. With the DTCs that you have the other codes could easily be the result of a MAF problem.
First of all, take a look under the hood for any signs of what went "poof". All of your codes indicate something is wrong in the intake system of your truck. Do you have a FIPK on your truck? Take a look at the MAF sensor. With the DTCs that you have the other codes could easily be the result of a MAF problem.
P0102 MAF Low or no input
P0136 No activity, Bank 1
P0156 No activity, Bank 2
P1131 Lack of switching, sensor indicates lean, Bank 1
P0136 No activity, Bank 1
P0156 No activity, Bank 2
P1131 Lack of switching, sensor indicates lean, Bank 1
P1151 Lack of switching, sensor indicates lean, Bank 2
Troubleshooting the P0102 DTC
http://www.obd-codes.com/trouble_cod...-low-input.php
Good Luck!
Troubleshooting the P0102 DTC
http://www.obd-codes.com/trouble_cod...-low-input.php
Good Luck!
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Problem solved!
I found the problem today. The backfire caused a vaccum line to blow off. It was the one that goes from the passenger side valve cover to the back of the engine near the top. Can someone tell me what this line does and what it actually plugs into. Thanks for all your help.
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