1999 jeep Grand cherokee 4.7 v8
10-26-2012, 04:29 PM
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1999 jeep Grand cherokee 4.7 v8
i have a 1999 jeep grand cherokee 4.7 v8...it has been broke down for six months or longer...it has 148k miles on it...i have changed the sparkplugs an the crank sensor...when i changed the crank sensor the pigtail broke an had to splice the wires....i have scanned it with an scan tool an i have gotten no codes...i have ran my jeeps self diagonistic an i have gotten no codes...it runs real rough like it is not firing on all cylinders but i have not gotten a misfire code or nothing...i thought tht the caddy might have been stopped up so i cut it off an still nothing...i have looked for vacum leaks an cant see any..as far as i cant tell...when it is ideling an u give it gas it trys to shuts off...if u put it in reverse or drive it will almost or will shut off....the coil packs look good....but tht means nothing....any suggestions????????????????
10-26-2012, 04:41 PM
#2
Old fart with a wrench
Just some background. What happened 6 mos. ago when it broke down? Is it possible you got some fuel contamination? Is your fuel pressure good?
10-26-2012, 04:55 PM
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Old fart with a wrench
Come on back, bud. I see you're still online.
Gone.
Gone.
Last edited by dave1123; 10-26-2012 at 05:24 PM.
11-01-2012, 02:38 PM
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buddy...i dont have no clue wht happen....i was just coming home from work..an it started acting like tht all the sudden...an i have check it an it has thrown no codes ......i just dont know what to do...
11-02-2012, 07:32 AM
#5
Old fart with a wrench
Sounds like it may be fuel contamination or a plugged filter. Check your fuel pressure at the rails.
11-03-2012, 01:02 AM
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Year: 2004
Model: Grand Cherokee
Engine: 4.7L V8
Welcome to CF. You said you replaced the crank sensor. Was it in the rear near the starter? That's the crank sensor. There's also a cam sensor on the right front of the engine attached to the right head on the side, below the rocker cover.
^I agree with Dave on the fuel issue. Could be bad gas from sitting for so long.
^I agree with Dave on the fuel issue. Could be bad gas from sitting for so long.
11-04-2012, 08:29 PM
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Year: 1999
Model: Grand Cherokee
Engine: 4.7L v-8
Electronic's
ECM'S, PCM'S, TCM'S. ECU'S. Sensor's here sensor's there, sensor's everywere and were you think there should be a sensor there isn't(Auto Shutdown sensor)= electronic's. Very time consuming to trouble shoot.
I have had costly problems with a design flaw in there elelctronics. Please review, may come in handy some day. It is inevetable(going to happen sooner or later)
http://forums.cnet.com/7723-7811_102...talling-fixed/
I have had costly problems with a design flaw in there elelctronics. Please review, may come in handy some day. It is inevetable(going to happen sooner or later)
http://forums.cnet.com/7723-7811_102...talling-fixed/
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11-05-2012, 09:50 PM
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alright..first of all i tryed to take the filter off an couldnt get it off>>any suggestions..also...i did replace the crank sensor above the starter..when i did the pigtail broke an had to splice the wire...the splice are good other wise they would throw a code....i dont think bad gas cause it dint set the start acting like this...it was doing this on the way home...an i did replace the o2 sensors...an there still throwing the code p0130 an p0136...an i did cut off the caddy thinking it wasstopped up....would love to have some help
11-05-2012, 10:35 PM
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also when the jeep is running...when u give it the gas it will give exhuast off...an u can smell the unburnt gas...it just started acting like this all of the sudden....
11-09-2012, 07:40 PM
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Year: 1995
Model: Cherokee
Engine: 4.0L
if theres alot of unburnt gas, it might not be hitting on all cylinders. at least thats my guess. i would check continuity and resistance of the coil packs. pick up a FSM and it should have the resistance specs in it. before all that i would flush the fuel system and put fresh in
11-09-2012, 09:25 PM
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well i added some new fuel to the jeep but i cant drive it anywhere to put fuel in it...also i thought if it had a cylinder misfire then wouldnt there be some kind of code???? also when i put the jeep into gear in reverse an drive it trys to die....not o bad in neutral an park
11-09-2012, 10:29 PM
#14
Old fart with a wrench
Your codes P130 and P136 still show problems with the 02 sensor circuits. Check for broken or shorted wires leading to the sensors.
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