5.4 surging/rough idle
#1
10-15-2015, 10:39 PM
5.4 surging/rough idle
I have a 2003 f150 5.4 239k miles and never had any issues with it, but recently it started having a rough idle when started, I have an Obd2 reader and it pulls the p1132 and p0135 codes, it sounds like a misfire on 1 or 2 cylinders, basically like its cammed, but it's all stock besides exhaust, when I drive down the road and get on it. It has no problem but when I let go and start cruising it starts shaking the truck, I usually put it in overdrive to pick up the Rpms and that usually does the trick but it concerns me, it's a beautiful truck and I love it but I just don't know where to start, I'm mechanically inclined with engines and I know just about everything to know about carburetors, just not fuel injection,ecu and what not I'd appreciate any help
#3
10-16-2015, 07:18 AM
Senior User
Join Date: Oct 2007
Location: Ohio
Posts: 233
Likes: 0
Received 0 Likes
on
0 Posts
Both codes point to O2 sensors (specifically Bank 1, Sensor 1), with that many miles I would start with replacing the O2 sensors, but getting the old ones out could be tricky if they haven't been replaced before. I replaced mine at 190k and broke an exhaust manifold trying to get one out (on a 4.2L so maybe it will be better on the 5.4L?)
You could also start by inspecting the O2 sensor wiring for damage.
Hope this helps
You could also start by inspecting the O2 sensor wiring for damage.
Code:
P1132-Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Rich - Bank No. 1 Read more at: http://www.obd-codes.com/trouble_codes/ford/ Copyright OBD-Codes.com
Code:
P0135-Oxygen O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1) - This code refers to the front oxygen sensor on Bank 1. The heated circuit in the oxygen sensor decreases time needed to enter closed loop. As the O2 heater reaches operating temperature, the oxygen sensor responds by switching according to oxygen content of the exhaust surrounding it. The ECM tracks how long it takes for the oxygen sensor to begin switching. It the ECM determines (based on coolant temp) that too much time elapsed before the oxygen sensor began operating properly, it will set P0135. Read more at: http://www.obd-codes.com/p0135 Copyright OBD-Codes.com
#4
10-16-2015, 03:23 PM
Both codes point to O2 sensors (specifically Bank 1, Sensor 1), with that many miles I would start with replacing the O2 sensors, but getting the old ones out could be tricky if they haven't been replaced before. I replaced mine at 190k and broke an exhaust manifold trying to get one out (on a 4.2L so maybe it will be better on the 5.4L?)
You could also start by inspecting the O2 sensor wiring for damage.
Hope this helps
You could also start by inspecting the O2 sensor wiring for damage.
Code:
P1132-Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Rich - Bank No. 1 Read more at: http://www.obd-codes.com/trouble_codes/ford/ Copyright OBD-Codes.com
Code:
P0135-Oxygen O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1) - This code refers to the front oxygen sensor on Bank 1. The heated circuit in the oxygen sensor decreases time needed to enter closed loop. As the O2 heater reaches operating temperature, the oxygen sensor responds by switching according to oxygen content of the exhaust surrounding it. The ECM tracks how long it takes for the oxygen sensor to begin switching. It the ECM determines (based on coolant temp) that too much time elapsed before the oxygen sensor began operating properly, it will set P0135. Read more at: http://www.obd-codes.com/p0135 Copyright OBD-Codes.com
#5
11-20-2015, 06:55 PM
Senior User
Join Date: Feb 2014
Location: Monroe, NY
Posts: 201
Likes: 0
Received 0 Likes
on
0 Posts
Thread
Thread Starter
Forum
Replies
Last Post
BrianA
1997 - 2003 F150
3
07-17-2012 06:14 PM