[ColdCase]

There have been problems with the WIN module of that era. There is a thread around here somewhere.

 

[ColdCase]

It does eventually start, just after a long crank right?

I’ll have to look up WK2 long crank when hot problems when I get back, although the Northeast storm may delay me a bit.

How many miles on the Jeep? Sometimes the cam phasers stick or either the crank or cam position sensors or harness become intermittent.

 

[ColdCase]

It does eventually start, just after a long crank right?

I’ll have to look up WK2 long crank when hot problems when I get back, although the Northeast storm may delay me a bit.

How many miles on the Jeep? Sometimes the cam phasers stick or either the crank or cam position sensors or harness become intermittent.

 

[ColdCase]

The WK2 pressure regulator/check valve is in the fuel pump. The system is under constant pressure.

If you want to measure the pressure, you'll have to disconnect the frame rail fuel supply line and insert a adapter/fitting. (release fuel pressure first by pulling the fuel pump fuse and running the engine until it won't run) It should be 58 psi /-2 psi or 59 +/- 5 psi depending on which document you are reading. Miller sells a Fuel Pressure Decay Tester kit 8978A.

The kit will allow checking for both an injector leak or fuel pump leak. Pressure should not drop more than 10 psi over 10 minutes. It is normal for it to drop to near zero after an hour or two.

Can you can tell if the fuel pump is running on those long cranks.

 

[ColdCase]

I got my Grand Cherokee back on the road quickly by contacting Vertical Visions LLC and had them express mail one of their units called a "TIPM Plug-In Fuel Pump Power Bypass/Test System (Lite)".
It took me a grand total of five minutes to install it in my fuse box. The vehicle started immediately and is running great again. I can't say if it's the best long term solution but its design seems to make sense. If nothing else, this will hopefully buy me some time until FCA figures out its latest recall solution.

That should work, but why didn't try simply replacing the relay? FCA found, as many of us have, that the relay they used builds up contact deposits over time and eventually fails. Those fuel pumps have a bit of surge current. I'm guessing the new recall will replace the relay with another brand, but FCA says they won't have the details worked out till maybe February.

 

[ColdCase]

Yeah, got my letter yesterday too, says they haven't determined the fix yet, but will let us know.