jason g
New Member
- Joined
- March 21, 2010
- Messages
- 2
- Reaction score
- 0
- City, State
- Kingman
- Year, Model & Trim Level
- '97 sport
Hello everyone, I've been lurking her for a week or so just searching around learning about these little trucks since I got a good deal (hopefully) on one recently. I was hoping my first post wouldn't have to be a help me post but unfortunatly it is.
To start off with let me say that I bought the sport from an old lady because the fuel pump quit. It's a 1997 4.0 sohc 4wd auto without any theft systems by the way. Replaced the pump and it fired right up. On the initial firing it made no noises that would lead me to believe that the cam tensioners are bad. Started and ran fine for several short trips around the block. Went out the next morning to start it and it just cranks, won't try to fire at all.
So far I've scanned it (p1000 not a lot of help), verified the pump is running as it should and has proper pressure. I checked a plug on each bank of the engine and have spark. I only have an old school compression guage that you have to hold against the hole so I can't get a good reading but I think comp is good enough it should at least try to fire. I pulled the coil pack and it checks ok. Pulled and dried the plugs, (they were wet) they have aprox 500 miles on them, wires too. According to my noid light the computer is pulsing the injectors. The tps and crank position sensor check out fine. The cam position sensor creates the signal my haynes manual says it should but there is no voltage present at the vehicle side of the connector, haynes says it should be 1.5 volts. So I double checked all the fuses and they are good.
Now I'm starting to think this may be an ecm issue. I would think that a voltage of 1.5 would have to be sent by a driver in the ecm. I searched and came up with a thread that says hynes is wrong in how they describe to check for voltage. I tried testing each wire to battery ground, then I tried testing them together based on the diagram in the manual that shows a pos. and a neg. terminal. Nothing. Earlier I grudgingly used a little ether to try to rule out the fuel sys and it didn't change anything.
I'm sorry for the book here but I've tried to be as descriptive as I can. This one has me stumped. I'm trying to resist the urge to start throwing money at it but I'm starting to want to get another ecm to check and see if that fixes it. All those cam chains also scare the heck out of me but I'm having a hard time believing that it slipped a tooth somewhere when I went out to start it since it was so quiet before. If anyone else has an idea I'd love to hear it!
To start off with let me say that I bought the sport from an old lady because the fuel pump quit. It's a 1997 4.0 sohc 4wd auto without any theft systems by the way. Replaced the pump and it fired right up. On the initial firing it made no noises that would lead me to believe that the cam tensioners are bad. Started and ran fine for several short trips around the block. Went out the next morning to start it and it just cranks, won't try to fire at all.
So far I've scanned it (p1000 not a lot of help), verified the pump is running as it should and has proper pressure. I checked a plug on each bank of the engine and have spark. I only have an old school compression guage that you have to hold against the hole so I can't get a good reading but I think comp is good enough it should at least try to fire. I pulled the coil pack and it checks ok. Pulled and dried the plugs, (they were wet) they have aprox 500 miles on them, wires too. According to my noid light the computer is pulsing the injectors. The tps and crank position sensor check out fine. The cam position sensor creates the signal my haynes manual says it should but there is no voltage present at the vehicle side of the connector, haynes says it should be 1.5 volts. So I double checked all the fuses and they are good.
Now I'm starting to think this may be an ecm issue. I would think that a voltage of 1.5 would have to be sent by a driver in the ecm. I searched and came up with a thread that says hynes is wrong in how they describe to check for voltage. I tried testing each wire to battery ground, then I tried testing them together based on the diagram in the manual that shows a pos. and a neg. terminal. Nothing. Earlier I grudgingly used a little ether to try to rule out the fuel sys and it didn't change anything.
I'm sorry for the book here but I've tried to be as descriptive as I can. This one has me stumped. I'm trying to resist the urge to start throwing money at it but I'm starting to want to get another ecm to check and see if that fixes it. All those cam chains also scare the heck out of me but I'm having a hard time believing that it slipped a tooth somewhere when I went out to start it since it was so quiet before. If anyone else has an idea I'd love to hear it!
