Engine choking, "too lean"
Thread Starter
Junior Member
Joined: Jul 2023
Posts: 27
Likes: 5
Engine choking, "too lean"
Hi all,
I have a 2002 V8 Triton 4.6L, 4WD. Last week my truck starting dying at low rpm, like the engine was choking. After getting the codes P0171 & P0174 I decided to change the Throttle Position Sensor which solved my issues.
But I would still have a check engine light saying my DPFE sensor (EGS Pressure Differential Sensor in my case) had to be changed.
I changed it and now I'm back to the same choking issue, the difference with before is that the engine chokes when I start it, but after driving for a few minutes is doesn't die anymore at low rpm.
i put the old sensor back in and the issue persists.
Any idea what could have gone wrong ? Should I replace my EGR valve or something ?
Thank you
I have a 2002 V8 Triton 4.6L, 4WD. Last week my truck starting dying at low rpm, like the engine was choking. After getting the codes P0171 & P0174 I decided to change the Throttle Position Sensor which solved my issues.
But I would still have a check engine light saying my DPFE sensor (EGS Pressure Differential Sensor in my case) had to be changed.
I changed it and now I'm back to the same choking issue, the difference with before is that the engine chokes when I start it, but after driving for a few minutes is doesn't die anymore at low rpm.
i put the old sensor back in and the issue persists.
Any idea what could have gone wrong ? Should I replace my EGR valve or something ?
Thank you
Last edited by AlaskanGlacier; Aug 16, 2023 at 01:19 PM. Reason: Forgot the vehicle specs
5 Year Member
Joined: Jun 2019
Posts: 2,721
Likes: 818
How did you equate the DPFE and throttle position sensor to those codes? That’s some serious firing of the random parts cannon.
The (or a, really) common cause for those codes on a Triton engine in that body style is a rotten hose on the back of the intake facing the firewall. It cracks at the elbow. All sorts of hilarity ensues.
To get help quickly, please let folks know what you are working on. Nobody likes to dig for vehicle info.
The (or a, really) common cause for those codes on a Triton engine in that body style is a rotten hose on the back of the intake facing the firewall. It cracks at the elbow. All sorts of hilarity ensues.
To get help quickly, please let folks know what you are working on. Nobody likes to dig for vehicle info.
Thread Starter
Junior Member
Joined: Jul 2023
Posts: 27
Likes: 5
How did you equate the DPFE and throttle position sensor to those codes? That’s some serious firing of the random parts cannon.
The (or a, really) common cause for those codes on a Triton engine in that body style is a rotten hose on the back of the intake facing the firewall. It cracks at the elbow. All sorts of hilarity ensues.
To get help quickly, please let folks know what you are working on. Nobody likes to dig for vehicle info.
The (or a, really) common cause for those codes on a Triton engine in that body style is a rotten hose on the back of the intake facing the firewall. It cracks at the elbow. All sorts of hilarity ensues.
To get help quickly, please let folks know what you are working on. Nobody likes to dig for vehicle info.
The reason I suspected the Throttle Position Sensor was because of the engine dying at low RPM. I read on forums that a bad TPS could cause that, and when I saw the code saying "too lean", I searched for that online and also found forums online saying that the TPS was likely to blame. Since I was close to a store and they had the part for $40 I thought I would give it a try, and it solved my issue but didn't clear the codes.
Concerning the DPFE sensor, I brought my car to Midas a while ago and they told me the code meant the sensor was bad. I verified online and with the "lean" keyword I found this website: https://www.aa1car.com/library/ford_lean_codes.htm
So that comforted me in the fact that I needed to change the DPFE sensor as well.
I will look into the hose issue, I haven't checked that yet.
How did you equate the DPFE and throttle position sensor to those codes? That’s some serious firing of the random parts cannon.
The (or a, really) common cause for those codes on a Triton engine in that body style is a rotten hose on the back of the intake facing the firewall. It cracks at the elbow. All sorts of hilarity ensues.
To get help quickly, please let folks know what you are working on. Nobody likes to dig for vehicle info.
The (or a, really) common cause for those codes on a Triton engine in that body style is a rotten hose on the back of the intake facing the firewall. It cracks at the elbow. All sorts of hilarity ensues.
To get help quickly, please let folks know what you are working on. Nobody likes to dig for vehicle info.
