Recent content by rnettleship

  1. R

    Right side higher than left

    I suspect it was a dirty electrical connections on the L/R air spring solenoid. With the l/r down on air it makes the r/f look ridiculously high. I pulled the solenoid out, bench tested, cleaned the electric connection as well as the plug and it seems fine now. My best guess is that the solenoid...
  2. R

    Right side higher than left

    A bit of a last resort. I tow a trailer and appreciate the load leveling aspects of the system.
  3. R

    Right side higher than left

    I have a 98 Navigator with 4 wheel air suspension. The right side of the vehicle is a good 3 inches higher than the left. I can see all air springs and shocks raising and lowering but for some reason the balance from right to left is off. I know the system only has a 2 ride height sensors and...
  4. R

    Evap gross leak. Curious canister vent symptoms

    I put an ohm meter on the lead from the PCM that is supposed to supply a ground to close the canister vent. When the PCM runs the running loss monitor I get nothing on the lead so it looks like the problem is in the PCM itself. I checked the grounds on the PCM and they all seem good. My best...
  5. R

    Evap gross leak. Curious canister vent symptoms

    Got it through inspection by using the toggle switch to close the canister vent. Now I have some time to test what signal if any I am getting out of the PCM.
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    Evap gross leak. Curious canister vent symptoms

    Thanks Roxy1225. I have the shop software and have been studying the entire evap system for the last few weeks. Here is my current situation: When the PCM calls for the canister valve to close as part of the Running Loss System Monitor the canister valve is not closing as I never achieve the...
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    Evap gross leak. Curious canister vent symptoms

    1 step closer. Although my canister vent valve bench tests fine and has 12v to it when the key is on it is not closing when the PCM calls for it. I have been tracing the wires from the rear of the car and first had some damage to the wiring harness just in front of the r/r wheel. I traced it up...
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    Evap gross leak. Curious canister vent symptoms

    I finally gave in and bought a new purge valve as I was 99% sure it had to be that. Now I'm back to square 1. Since I have 2 valves I decided to take the old one apart to see how it works. There is a small vacuum port that has constant vacuum applied. At rest the vacuum is allowed to pass...
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    Evap gross leak. Curious canister vent symptoms

    Any EVAP system experts out there??? P0455 I changed the gas cap - did not fix I pressure tested the system from the purge management valve under the hood after first closing the canister vent valve by manually putting 12v and ground to it and the system easily holds 1# psi with no...
  10. R

    Evap gross leak. Curious canister vent symptoms

    I decided to troubleshoot the P0455 code from the rear of the vehicle forward. I pulled the canister vent solenoid and it bench tested fine using a battery charger as the power supply. It sealed completely when 12v was applied. I then turned the engine on and tested the plug and got 12+ volts...
  11. R

    Wiring question...

    Case closed. I drove the vehicle over 100 miles last night, half towing a trailer and half not. Everything is working fine now. Looks like wires going to the vent solenoid was the culprit.
  12. R

    Wiring question...

    Thanks for the tip on Forscan. It works great. I pulled the compressor and found the two leads going to the vent solenoid had their insulation worn through in a few spots. I put some shrink tubing on them and attached to a battery. I could hear the solenoid work and verified that when it did I...
  13. R

    Wiring question...

    Fourty03---Thanks for the tip on the FORSCAN. I thought I needed a big $ scanner to access those codes. I ran the self tests and came back with a C1770 Air Suspension Control Module Air Suspension Vent Solenoid Output Circuit Failure. This lines up with my theory that the system is having...
  14. R

    Wiring question...

    Thanks, I'll try both of those and see what I get.
  15. R

    Wiring question...

    Update - Seems like the compressor relay and ride height sensors are fine. I think the problems is that the system is not able to release air pressure fast enough. I tow a 5k # trailer and each time I hook it up the compressor starts and the rear end rises to compensate. When I unhook the...
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