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98 4.0 sputtering only at wide open throttle under 30 mph.


crokarlo

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Joined
Oct 26, 2016
Messages
53
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Location
Phoenix AZ
Vehicle Year
1998
Make / Model
ford
Transmission
Automatic
I have a 98 ranger 4.0 4x4. I went through some trouble installing a cam position syncro had code p1309. I installed it wrong due to bad info and after installing it again doing it exactly by the book I had p1340. Circuit malfunction code. I checked the wiring and the signal wire seemed to be bad. I went and bought a cam position connector with pig tails. I spliced that directly into the pcm harness and double checked everything. Trucks starts right up and runs perfect. No more p1309 code. But it's not getting enough fuel. It mis fires slightly not as bad as pulling a spark plug but no fuel maybe. I took it for a test drive. And under 30 mph it has no power with wide open. Half throttle is perfect ! Has power and it moves. I also noticed a lot of gas has leaked out and cleaned up my 8.8 expo rear end. It was dirty before but no there's a huge clean spot and there appears to be gas on the outside of the tank. I'm wondering if s bad fuel pump seal would cause air to get into the system and their not be enough gas going into the motor.

I've replaced in the past month.
Plugs. Wires. Coilpack. MAF. IAC. TPS pcv valve. Syncro and sensor. I replaced the pump and filter last September was an Amazon fuel pump some off brand has ran fine since. And filter was Orilleys.


Possibly bad computer?


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telsar

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Joined
Jun 23, 2017
Messages
57
Reaction score
4
Points
8
Location
Houston TX
Vehicle Year
93
Make / Model
ford
Transmission
Manual
I have a 98 ranger 4.0 4x4. I went through some trouble installing a cam position syncro had code p1309. I installed it wrong due to bad info and after installing it again doing it exactly by the book I had p1340. Circuit malfunction code. I checked the wiring and the signal wire seemed to be bad. I went and bought a cam position connector with pig tails. I spliced that directly into the pcm harness and double checked everything. Trucks starts right up and runs perfect. No more p1309 code. But it's not getting enough fuel. It mis fires slightly not as bad as pulling a spark plug but no fuel maybe. I took it for a test drive. And under 30 mph it has no power with wide open. Half throttle is perfect ! Has power and it moves. I also noticed a lot of gas has leaked out and cleaned up my 8.8 expo rear end. It was dirty before but no there's a huge clean spot and there appears to be gas on the outside of the tank. I'm wondering if s bad fuel pump seal would cause air to get into the system and their not be enough gas going into the motor.

I've replaced in the past month.
Plugs. Wires. Coilpack. MAF. IAC. TPS pcv valve. Syncro and sensor. I replaced the pump and filter last September was an Amazon fuel pump some off brand has ran fine since. And filter was Orilleys.


Possibly bad computer?


Sent from my iPhone using Tapatalk
I am not sure why its running bad could be a ton of stuff. You will need to diagnose the problem. I suggest watching this guys videos on youtube to help develop a strategy:

https://www.youtube.com/channel/UCnIQ-_hRpyHR68f23dQQHUg

Look for a video with a similar problem diagnosis.


The leaking gas, I have a guess. My 93 Ranger a couple years ago was leaking because the filler tube line developed a crack right where it hooks on the top of the gas tank. I bought a new filler tube and line from Ebay for about $60 and replaced it. I found some youtube videos on how to doit the easy way. I just lifted the bed of the truck up in the front and left it connected in the back with the bolts loosened. Put a 2x4 under it to hold it up. I think you can see the fuel pump, also that way.

Good luck.
 

crokarlo

New Member
Joined
Oct 26, 2016
Messages
53
Reaction score
2
Points
0
Location
Phoenix AZ
Vehicle Year
1998
Make / Model
ford
Transmission
Automatic
Appreciate the help thank you :)


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