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  #1  
Old 01-04-2010, 05:59 PM
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Friend needs help with his WJ

ok i got a buddy with the 4.7 WJ... it has problems...

when he starts it, sometimes it starts up, other times he has to pump the gas to keep it at around 1,000 rpm or it shuts off. Then after a sec he can let it go back to idle and run...

then he can shift it into reverse, back out of his spot, but as soon as he puts it in drive, it shifts, then dies.

Any ideas?
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'09 Modern Blue STR8, fully loaded, 5% tint all around 40% windshield, 4" Bwoody, 5" Tips, 6K HID Reverse,lows,fogs and switchbacks. Blacked out LED tails. PX8 rear step. Body matched ANTIVENOM hood. Lots of BT goodies, tuned by FRP. Best 1/4 ET so far: 12.65

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Old 01-04-2010, 06:04 PM
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Re: Friend needs help with his WJ

im just guessing...... fuel pump?
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Old 01-04-2010, 06:05 PM
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Re: Friend needs help with his WJ

i was thinking that,but it will idle for however long until he puts it in gear....
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'09 Modern Blue STR8, fully loaded, 5% tint all around 40% windshield, 4" Bwoody, 5" Tips, 6K HID Reverse,lows,fogs and switchbacks. Blacked out LED tails. PX8 rear step. Body matched ANTIVENOM hood. Lots of BT goodies, tuned by FRP. Best 1/4 ET so far: 12.65

'07 WK 4.7L Laredo. 28X package. RK 3.5" lift, 18" Sahara brushed rims, SOLD
'94 ZJ 4.0. 4.5" lift, 33" swampers, body armor, lots of mods. SOLD
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Old 01-04-2010, 10:06 PM
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Re: Friend needs help with his WJ

Could be a bad TPS or IAC, but another possibility may be a bad battery, these things do some pretty crazy things when the voltage is too low.
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Old 01-04-2010, 10:20 PM
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Re: Friend needs help with his WJ

Try first doing the simple and inexpensive change of spark plugs! Could be not firing a cyl....
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Old 01-04-2010, 10:48 PM
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Re: Friend needs help with his WJ

he changed the plugs... still doing it.... looks like its going to the dealership
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'09 Modern Blue STR8, fully loaded, 5% tint all around 40% windshield, 4" Bwoody, 5" Tips, 6K HID Reverse,lows,fogs and switchbacks. Blacked out LED tails. PX8 rear step. Body matched ANTIVENOM hood. Lots of BT goodies, tuned by FRP. Best 1/4 ET so far: 12.65

'07 WK 4.7L Laredo. 28X package. RK 3.5" lift, 18" Sahara brushed rims, SOLD
'94 ZJ 4.0. 4.5" lift, 33" swampers, body armor, lots of mods. SOLD
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Old 01-05-2010, 02:43 AM
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Re: Friend needs help with his WJ

Don't take it to a stealership....If your saying that he JUST changed the spark plugs that is probably the reason for the rough idle and not running. If you do not clean and insert the plugs correctly and place the coil packs back on securely one or more cyl will not fire and will run exactly how you are describing. Take them out again, clean them and the holes they go in and reinsert, then snuggle put the coil packs back on and secure it down. Reconnect battery and try again!
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Old 01-05-2010, 09:22 AM
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Re: Friend needs help with his WJ

he changed the spark plugs to try and fix the problem.. and it didnt help or hurt...
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'09 Modern Blue STR8, fully loaded, 5% tint all around 40% windshield, 4" Bwoody, 5" Tips, 6K HID Reverse,lows,fogs and switchbacks. Blacked out LED tails. PX8 rear step. Body matched ANTIVENOM hood. Lots of BT goodies, tuned by FRP. Best 1/4 ET so far: 12.65

'07 WK 4.7L Laredo. 28X package. RK 3.5" lift, 18" Sahara brushed rims, SOLD
'94 ZJ 4.0. 4.5" lift, 33" swampers, body armor, lots of mods. SOLD
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Old 01-05-2010, 10:30 AM
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Re: Friend needs help with his WJ

Try cycling the ignition switch on/off 3 times and see what (if any) codes come up in the odometer.
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Old 01-05-2010, 12:04 PM
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Re: Friend needs help with his WJ

i had this problem also my fix was a new battery and iac sensor and u will have to drive it for a few miles for the computer to reset all codes
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Old 01-05-2010, 04:09 PM
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Re: Friend needs help with his WJ

i think its the idle air control also. id change or clean that first
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Old 01-05-2010, 04:43 PM
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Re: Friend needs help with his WJ

Bent fuel lines or bad fuel pump, just a wild shot, get it tested maybe.
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