tnxj
NAXJA Forum User
- Location
- Knoxville, TN
For a long time now my XJ has been running 40-45psi at speed and barely 13psi at idle. I wasn't happy, but I figured, "well it does have 200K and it is within spec after all." Then today it dropped to ZERO! I had just changed the plugs so I thought this was an awfully big coincidence. Stopped, popped the hood, jiggled the wiring harness (that I had bumped quite a bit changing the back plug) and it jumped back up somewhat, however it was still on the low side and very inconsistent. Drove it 1/8 mile home and jumped in my truck and went to Autozone. Purchased a Sunpro mechanical gauge for $14 and hooked it up. 35psi at idle and ~60-65psi at speed!
So now I'm trouble shooting the wiring/ gauge/ sender and have some questions: With the plug unplugged from the sensor it should read 80psi, right? Mine reads ZERO. What does this mean? What is my next step? There appear to be 2 wires going to the sensor. I feel much better knowing my pressure is actually okay (assuming I can trust the mechanical gauge....thoughts?), but now I need to fix the factory gauge/ circuit, and I'm a little lost. Oh and this is on a 98 XJ with the 4.0. Thanks in advance.
So now I'm trouble shooting the wiring/ gauge/ sender and have some questions: With the plug unplugged from the sensor it should read 80psi, right? Mine reads ZERO. What does this mean? What is my next step? There appear to be 2 wires going to the sensor. I feel much better knowing my pressure is actually okay (assuming I can trust the mechanical gauge....thoughts?), but now I need to fix the factory gauge/ circuit, and I'm a little lost. Oh and this is on a 98 XJ with the 4.0. Thanks in advance.