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Wrangler: 2007 Jeep Wrangler 3.8 L , 72,000 Mi. Engine has

Resolved Question:

2007 Jeep Wrangler 3.8 L , 72,000 Mi.
Engine has stalled , jerked and quit while on the highway and climbing a mountain grade .
This has happened on 3 different occasions , within a 90 day period .
The engine pressures and temperatures were normal along with a 3/4 tank fuel level.
The engine will restart within 30 minutes but will cutout and quit .
OBD II scanner displays no codes , all clear .
Jeep will run normally after a few hours of sitting , just now had it up to 80 + miles per hour with no issues .
All 3 malfunctions have this scenario in common.
1. Traveling in excess of 60 highway miles .
2. Climbing a hill or mountain grade .
3. A/C was on .
4. Fuse and relay distribution box above warm to the touch .

Location is southern New Mexico -Ambient temp is above 95 degrees
Mechanically all appears to be okay until on an extended trip .
Submitted: 1 year ago.
Category: Jeep
Expert:  Chris replied 1 year ago.
Welcome and thank you for allowing me to assist you!

There are 3 common causes for this. 1 a failing crank shaft
position sensor, 2 a failing cam shaft position sensor, and 3 a failing PCM
(engine computer). Either one can act up when the engine warms up I have seen some issues where a cam or crank sensor will fail and not set a code. But try this the next time it acts up: crank the engine for at least 15 seconds and then recheck for a cam or crank sensor code. If there are no codes at all, then
suspect a failing PCM and have it replaced. Most auto parts stores will connect
their scan tool for no charge to you.

Hope this information helps, and let me know if you need more
assistance with this.



 



Chris
Chris, Shop Foreman
Category: Jeep
Satisfied Customers: 10216
Experience: Jeep and ASE Certified Master Tech
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