Chuck "Classic Ford" JR.
New Member
- Joined
- Jan 16, 2014
- Messages
- 85
- Reaction score
- 4
- Points
- 0
- Location
- Columbus, GA
- Vehicle Year
- 1986
- Make / Model
- Ford
- Engine Size
- 2.9L V6
- Transmission
- Automatic
This is kind of a long story, but I will try to condense it as best I can.
My 86 Ranger 2.9L had a hesitation upon accelerating that had bugged me since I bought the truck. So I asked my Ford ASSET instructor to come out and take a look at my truck, and we discovered that the vacuum line to the fuel pressure regulator had come unplugged. After plugging it back in and "giving the computer time to 're-learn' how to run right again" as my instructor put it, the skip didn't go away, so we brought it back in, and after checking for trouble codes, we found out that the Throttle Position Sensor and EGR Pressure Feedback Sensor were both faulty, so I replaced them both and also repaired another vacuum line that had snapped in two (one of those plastic ones, the green one to be specific).
Now, to back track a little bit, after I plugged the FPR's vacuum line back in to start with, my truck had a strange condition where once it got hot, after starting and stopping a few times (I.E. city driving) it would not accelerate, but instead it would sputter and backfire and then just die until the Lord felt sorry for me and allowed me to finally limp it back to the house. Fast forward to where I left off, and the problem has not gone away, so I replaced the two faulty sensors and limped the thing to school so we could run further tests on it. After getting the thing warm and hooking a fuel pressure gauge up to it, we determined that the in-line fuel pump was not putting out enough pressure when it got hot, but if you went underneath and tapped it a couple times, it would start working again for a few seconds, then just die off. So back to O'Reilly I went, and I dropped another fuel pump in it. After putting everything back the way it was and checking that the timing and idling were correct, everything was peaches and cream. For about a week....
Fast forward again to the way it sits today. When I start the truck up first thing in the morning, you can hear it sucking in air through the air filter quite loudly. I do have a high flow K&N air filter on the truck, but I'd never heard it doing this before until just recently. After letting the truck warm up a bit, when I go to take off the acceleration hesitation is back, and there is a slight skip for like the first half-second. It does this the first few times, then goes away mostly. After driving back to my hometown of Columbus to start back to work at the Ford dealership here from Birmingham (about a 3 hour drive), it's getting to where now when I drive into town or something, the sputtering/backfiring/dying has returned, and I have no idea what's causing it. This morning I went outside and pulled the following Key On Engine Running DTC's:
25 - Knock not sensed during Dynamic Response Test
33 - EGR Valve fault / Not closing properly
74 - Brake On/Off (BOO) Switch fault; not actuated
77 - Wide Open Throttle not sensed / Operator error
I'm guessing my EGR valve is gone or going? I'm just starting out with actually doing this for a living, so I'm not really an expert with this sort of thing (hence why I'm going to school for it, Lol). If anyone can help me out, I would greatly appreciate it. Rusty (my truck) is my daily driver and the only vehicle I own, and besides which, that truck is my baby and I can't stand to see it running the way it does (literally; it kinda pisses me off). So again, to recap everything:
-Brand new Throttle Position Sensor, EGR Pressure Feedback sensor, In-Line Fuel Pump
-SEVERAL vacuum lines repaired
-Engine sputters/loses power/backfires/dies when hot and driving in city conditions (of course, I haven't really tried to take it on the highway while it's screwing up).
-DTC's 25, 33, 74, 77 pulled with scan tool (as listed above)
-Only transportation
ANY and ALL suggestions are GREATLY appreciated, because as the old saying goes, your guess is as good as mine (probably better than mine at this point).
My 86 Ranger 2.9L had a hesitation upon accelerating that had bugged me since I bought the truck. So I asked my Ford ASSET instructor to come out and take a look at my truck, and we discovered that the vacuum line to the fuel pressure regulator had come unplugged. After plugging it back in and "giving the computer time to 're-learn' how to run right again" as my instructor put it, the skip didn't go away, so we brought it back in, and after checking for trouble codes, we found out that the Throttle Position Sensor and EGR Pressure Feedback Sensor were both faulty, so I replaced them both and also repaired another vacuum line that had snapped in two (one of those plastic ones, the green one to be specific).
Now, to back track a little bit, after I plugged the FPR's vacuum line back in to start with, my truck had a strange condition where once it got hot, after starting and stopping a few times (I.E. city driving) it would not accelerate, but instead it would sputter and backfire and then just die until the Lord felt sorry for me and allowed me to finally limp it back to the house. Fast forward to where I left off, and the problem has not gone away, so I replaced the two faulty sensors and limped the thing to school so we could run further tests on it. After getting the thing warm and hooking a fuel pressure gauge up to it, we determined that the in-line fuel pump was not putting out enough pressure when it got hot, but if you went underneath and tapped it a couple times, it would start working again for a few seconds, then just die off. So back to O'Reilly I went, and I dropped another fuel pump in it. After putting everything back the way it was and checking that the timing and idling were correct, everything was peaches and cream. For about a week....
Fast forward again to the way it sits today. When I start the truck up first thing in the morning, you can hear it sucking in air through the air filter quite loudly. I do have a high flow K&N air filter on the truck, but I'd never heard it doing this before until just recently. After letting the truck warm up a bit, when I go to take off the acceleration hesitation is back, and there is a slight skip for like the first half-second. It does this the first few times, then goes away mostly. After driving back to my hometown of Columbus to start back to work at the Ford dealership here from Birmingham (about a 3 hour drive), it's getting to where now when I drive into town or something, the sputtering/backfiring/dying has returned, and I have no idea what's causing it. This morning I went outside and pulled the following Key On Engine Running DTC's:
25 - Knock not sensed during Dynamic Response Test
33 - EGR Valve fault / Not closing properly
74 - Brake On/Off (BOO) Switch fault; not actuated
77 - Wide Open Throttle not sensed / Operator error
I'm guessing my EGR valve is gone or going? I'm just starting out with actually doing this for a living, so I'm not really an expert with this sort of thing (hence why I'm going to school for it, Lol). If anyone can help me out, I would greatly appreciate it. Rusty (my truck) is my daily driver and the only vehicle I own, and besides which, that truck is my baby and I can't stand to see it running the way it does (literally; it kinda pisses me off). So again, to recap everything:
-Brand new Throttle Position Sensor, EGR Pressure Feedback sensor, In-Line Fuel Pump
-SEVERAL vacuum lines repaired
-Engine sputters/loses power/backfires/dies when hot and driving in city conditions (of course, I haven't really tried to take it on the highway while it's screwing up).
-DTC's 25, 33, 74, 77 pulled with scan tool (as listed above)
-Only transportation
ANY and ALL suggestions are GREATLY appreciated, because as the old saying goes, your guess is as good as mine (probably better than mine at this point).