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Jeep Grand Cherokee
#674 of 1240 Doesnt run properly when hot
Apr 02, 2010 (3:07 pm)
My 93 jeep grand cherokee runs fine when you first start it but after driving for a while especially i hot weather it starts to act like it wants to stall out and I could have my foot all the way to the floor and it will not accelerate past 20mph. If I take my foot off the gas or come to a stop it will shut off. By that time there is a really strong gas smell that I was told was a leak in the exhaust. I can start it back up but it sputters and jerks. If I let the truck sit for about an hour it will start and run fine as long as its not hot outside. I replaced all the tune-up parts and have put two sets of plugs in it. When I put the second set in there in notices that the other ones I took out were white as if the motor was running too hot, but the truck does not over heat. I made sure the plugs were gapped properly and used the factory champion plug. i check the fuel pressure while it was idling and it was ok. The only thing I have not replaced on the truck is the manifold gasket. I was going to replace that and the manifold since I was told the exhaust leak was at the y-pipe. It is a costly repair and i want to be sure that the problem will be fixed. PLEASE HELP
#675 of 1240 Re: Doesnt run properly when hot [moe34]
Apr 02, 2010 (5:52 pm)
have you changed the coil?
#676 of 1240 Re: Doesnt run properly when hot [moe34]
Apr 03, 2010 (7:33 am)
It helps to know which engine...mileage...any check engine lights or trouble codes...
Start with the free stuff...remove the Idle (Air) Control Motor and clean with carb cleaner or replace it if you wish.
Disconnect the battery and then remove the connections to the Engine Control Module. Apply dielectric grease to the connector and to the pins and reassemble.
If these have no effect check the coil. Primary resistance (between terminals A & B) should be around 0.95 to 1.20 ohms. Secondary resistance (between terminals A & secondary terminal) should be around 11.3 to 13.3 k-ohms
The manifold gasket should have little effect unless it is so bad causing the O2 sensors to send bad info to the ECM.
Let us know...
#677 of 1240 not running properly.
Apr 05, 2010 (6:46 am)
I have a 93 grand cherokee that has 205,000 miles with a straight 6. After about 20 minutes of driving it starts to bog down like it wants to shut off. If i give it gas it will keep running for a short time but will not accelerate pass about 30 mph. If I come to a stop it will shut off. It will start back up but will run really bad and sputters along. I have replaced all the tune-up parts and the plugs are gapped right. I replaced the coil and cleaned the iac motor. When the problem occurs the truck does not overheat. I tested the fuel pressure and it was good. I didnt test the pressure when the problem was occuring. Should I test the pressure when the problem occurs or is that even necessary? If I let the truck sit for about an hour it will start and run fine. What should be my next step?
#678 of 1240 Re: not running properly. [moe34]
Apr 05, 2010 (3:33 pm)
I will assume there are no check engine lights or OBD II codes...AND you have a multi-meter to check voltage and ohms...
After you grease (dielectric grease) the connectors for the PCM check these three sensors:
Throttle Position Sensor - check voltage across the (+) wire (Purple/white) and the (-) wire (black/blue). Voltage should be 5.0 volts. Next check signal voltage across the (+) wire (orange/blue) and ground. It should be 0.5 volts. Move the throttle to a fully open position and voltage should increase to 4.5 - 5.0 volts. Replace if necessary.
Crankshaft Position Sensor -check ohms across terminals B & C on the crankshaft position sensor (B is the center terminal and C is to its right when the connector locking tab is on the top). Resistance is infinite. Replace if resistance is low.
MAP Sensor - check vacuum hose for deterioration...check electrical connector for a good fit and the wires for deterioration, looseness and breaks. With the ignition on (engine not running) check the voltage on the positive (+) wire(purple/white) to ground (-). It should read between 3.5 - 5.5 volts. Turn key off and connect the connector up to the sensor. Turn key on (engine not running) then check voltage on the signal wire (red/white)(+)to ground (-). It should be 1.5 - 3.0 volts. Replace if necessary.
Let us know...If this doesn't reveal a problem...We can try the camshaft position sensor next.
#679 of 1240 2007 Jeep Grand Cherokee starting problem
Apr 08, 2010 (8:22 pm)
I just bought a 2007 Jeep Grand Cherokee that has a factory remote car starter. I am having a problem when I attempt to start the vehicle. It happens both using the remote car starter and the key in the ignition.
I go to start the vehicle and the engine begins to start but then starts sputtering and stumbling like its running out of gas or not engaging completely. It feels like the engine is half started. None of my lights are on. I have taken back to the garage and they cant find a problem and of course it doesnt do it while they have it. They checked it on the computer and no codes are active.
It happens both when its cold and when its hot. Any suggestions???
#680 of 1240 Give Us More Information
Apr 09, 2010 (5:30 am)
It helps to know which engine and how many miles.
Start with the free stuff first. I would remove the Idle Air Control Motor and clean with some carburetor cleaner and then re-install.
#682 of 1240 Stalling, Stuttering & Bad Coolant Sensor Alert
Apr 17, 2010 (2:21 pm)
I have been having problems since Nov.09 with my 98 GC.
In the last 3 weeks my jeep has been at the dealership 3 times.
They have replaced spark plugs, wires, distributor cap, 02 sensors, pcm, and an ignition coil(3rd one) and said they fixed my bad coolant sensor. I picked it up on Thursday and the bad coolant sensor popped on within 2 miles from dealership. My jeep is stumbling and stalling when I am going low speed or at a stop. Today it cut off on me while going over railroad tracks. Since so much has been replaced, is it possible that the bad coolant sensor is causing all of my problems? Today while being in line at the drive thru at my bank, the bad coolant sensor popped on and within seconds my jeep cut off.
Any ideas will be greatley appeciated.
#683 of 1240 Grand Cherokee- Idle issue
Apr 25, 2010 (2:06 pm)
Wondering if anyone can help. A few months ago, my 04 GC Laredo(4.0L) began stalling out of nowhere whenever I would come to a stop. If I was pressing the throttle, it seemed to work fine As soon as I got home the problem cleared up and didnt act up for a couple weeks. The second time, it threw a code. I scanned the PCM, and found code P0505(Idle Air Control). I replaced the IACV, cleared the code, and it seemed to be fixed. A couple weeks later, I got a MIL light again. Checked the code, and same thing. P0505. I was unable to reset the code with my OBD scanner so I tore into it again, and ended up cleaning the throttle body, and valve airway. As soon as I did this, I heard a big 'WHOOSH' as it seemed to clear the airway. The MIL light then shut off, and I was able to clear the code. A couple weeks later, the light came back with the same code. Everything I have read states that it either has to be the IACV, the wiring, or the PCM. The car seems to run fine, but it sputtered alittle bit when I was working with the connector. Also the throttle body seems to have some dark deposits on it again as well. Is there anything else, short of replacing the wiring harness, or valve connector, or PCM that could be causing this? I am suspecting the connector is bad, but not sure if you can replace just the connector. I like to work on my own vehicles, but I am close to taking it to a dealer for a fully blown diagnostic test, but I am afraid they will want to change the PCM, which I know is the most expensive option. Could a vacuum leak cause this? It is a very intermittent problem. For the most part the car runs fine, even when the MIL lamp is on, but it does occasionally stall out or idle very erratically when at a stop. I really want to get this fixed. Anyone have any ideas?