On mobile, sorry for errors.
The truck is a mix of a lot of different parts, but she's seen over 20k, and not really given me any issues, until now. Engine/injectors are '99 Ram Van (unknown mileage), trans is a '91 46RH with the Dakota's original tail shaft. Stock '92, 3.9 wiring harness with the extra injectors added to the loom. Vacuum lines are about three years old, all inspected, and all zip tied onto their ports. Plugs and wires are fine, stock replacement parts. O2 and cat were new 22k ago. Computer is an AutoZone reman, and is showing no codes. Truck is running shorty headers. It has had the wiring loom repair, under the main fuse block, that causes the computer to lose power.
It did have an issue with its CPS, that would make the truck not want to exceed 2000 rpms, or 70 mph. Found to be the CPS wires were too close to the header, and had gotten too warm. Replaced the sensor about 1000k ago, but then this a appeared.
Now, when the truck is dead cold, or fully warm, it runs fine. When it's just starting to get warm, about a mile from home, she coughs, kicks, and makes a sound similar to lugging a manual trans truck in to high of a gear. I was suspecting a faulty temp sensor putting the truck in closed loop before the O2 was warm, so I disconnected it to keep the truck in open loop. Besides for tanking my mileage, it just made the problem more pronounced, but it would do it for a shorter amount of time. Placing the truck in neutral and revving it hard would somewhat take care of the problem, but I cringe about doing this with cold parts. Disconnected the solenoid for the EGR seems to have helped a little, but it's only been disconnected for a day.
Mileage appears to have been falling since August, but I did have a job site change that has taken me from almost all freeway, to almost all city.
Here you can see what it's doing:
And my scary decrease in mileage (in the graph about half way down): http://www.fuelly.com/car/dodge/dakota/1992/exdelayed/367817
Any ideas would be awesome!
EDIT: Listened to the sound better on the way home tonight.
The truck is a mix of a lot of different parts, but she's seen over 20k, and not really given me any issues, until now. Engine/injectors are '99 Ram Van (unknown mileage), trans is a '91 46RH with the Dakota's original tail shaft. Stock '92, 3.9 wiring harness with the extra injectors added to the loom. Vacuum lines are about three years old, all inspected, and all zip tied onto their ports. Plugs and wires are fine, stock replacement parts. O2 and cat were new 22k ago. Computer is an AutoZone reman, and is showing no codes. Truck is running shorty headers. It has had the wiring loom repair, under the main fuse block, that causes the computer to lose power.
It did have an issue with its CPS, that would make the truck not want to exceed 2000 rpms, or 70 mph. Found to be the CPS wires were too close to the header, and had gotten too warm. Replaced the sensor about 1000k ago, but then this a appeared.
Now, when the truck is dead cold, or fully warm, it runs fine. When it's just starting to get warm, about a mile from home, she coughs, kicks, and makes a sound similar to lugging a manual trans truck in to high of a gear. I was suspecting a faulty temp sensor putting the truck in closed loop before the O2 was warm, so I disconnected it to keep the truck in open loop. Besides for tanking my mileage, it just made the problem more pronounced, but it would do it for a shorter amount of time. Placing the truck in neutral and revving it hard would somewhat take care of the problem, but I cringe about doing this with cold parts. Disconnected the solenoid for the EGR seems to have helped a little, but it's only been disconnected for a day.
Mileage appears to have been falling since August, but I did have a job site change that has taken me from almost all freeway, to almost all city.
Here you can see what it's doing:
And my scary decrease in mileage (in the graph about half way down): http://www.fuelly.com/car/dodge/dakota/1992/exdelayed/367817
Any ideas would be awesome!
EDIT: Listened to the sound better on the way home tonight.