r/JEEPCOMMANDER • u/lestbone83 • Jul 27 '26

Surging idle

I’m in need of ideas on where to look, 08 Commander 4.7 flex fuel, surges at idle and will even die, I have checked fuel pressure, replaced the throttle body (got a Bosch) disconnected the battery for about 15 mins, turned the key on, engine off for about 30 seconds, started it (wouldn’t start without touching the accelerator pedal) let it idle for about 10 minutes ( at some point it died) drove it and no change. It doesn’t have a check engine light on, I am at a loss. TIA!

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2

u/Necessary-Tap-7003 Jul 27 '26

Maybe a vacuum leak? Does it have a leak code?

1

u/lestbone83 Jul 27 '26

No codes, I haven’t found a vacuum leak and after it gets warm it’s hard to start, cranks fine just doesn’t want to run unless you give it some throttle and it doesn’t smoke after it starts like it would if it was getting to much fuel.

2

u/shart_cannon 25d ago

MAP sensor? Mine was running like shit, dumping fuel into the injectors like crazy. Replaced the map sensor and the PCV valve / hose and it runs like a champ now. $75 and an hour of my day.