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-   -   08 Liberty Starting problem (http://www.jeepgarage.org/f189/08-liberty-starting-problem-45053.html)

jhoberg 07-23-2012 10:20 AM

08 Liberty Starting problem
 
I have a wierd starting problem with my 2008 Liberty. This is an intermittent problem that does not happen when the Jeep is at the dealership, of course, but happens everyday to me. I made a video and showed the guys at the dealership but they don't know what's causing it. The video is on youtube. enter "obergjames" in search and it will come up.
So far they have replaced the ignition tumbler. I replaced the ignition switch. No change so put original switch back in. I also have replaced the relays in the fuse block for "Starter Solenoid Relay K3" and "Run Start Relay K4" with no change. When turning the key to start the starter engages but does not disengage when the ignition key returns to run position as shown in the video. Any ideas?

jhoberg 09-06-2012 10:23 AM

Re: 08 Liberty Starting problem
 
After dealing with this problem for over a year the dealer finally hit on something that was illogical to me but worked to repair the problem. The mechanic ran tests on the Jeep and found that the fuel pump was loosing pressure. It was bleeding down more than specifications allowed. When I was told this information I said there was no way this was causing the starter to continue cranking with my hand off of the ignition switch. Made no sense. If the fuel pump is failing it would result in longer cranking time to start the engine but not cause the starter to continue cranking on its own.
I finally approved the fuel pump replacement. Since then, the starting problem has not happened at all. Somehow the fuel pump must send a signal to the computer to make the starter continue to crank even though the key is in the run position.
If you are having this problem I would recommend that you have the fuel pump pressure tested. If its bleeding down outside of specification, replace the fuel pump.

Jim


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