Newbie having grand cherokee issues

[n3rdpwdr]

TBI is a throttle body injection, it looks very similar to a carb however works like fuel injection. An ECM is the computer that controls all of the electronics for the motor. A lot of times this issue that you are having is caused by a sensor on the TBI (MAP, TPS,), failing ECM, a wire short or break between the two, or fuel line. If you have taken the fuel line apart at the filter and turned the key on (don't crank the engine, just turn key to on) and get a spray of fuel out of the line replace the filter. If that does not fix it then what I would do is take a can of electronic connection cleaner and clean all of the connectors that attach to the TBI. If that doesn't fix it then I would take a one gal. fuel jug and try to keep the engine running by TRICKLING fuel into the TBI. If you can keep it running that way then you probably need to start replacing the sensors on the TBI. Start with the MAP sensor. This is the one responsible for fuel air mixture and does the "choke" function of the TBI.

 

[kaylaah]

I am wondering if anyone could tell me or even better show me a picture of where the sensors are that are throttle body and fuel related. Also any tips on troubleshooting to figure out which sensor needs replacing would be greatly appreciated

 

[Utah_jeepster]

Your fighting a possible sensor issue or a common grand cherokee problem. Since your not mechanically inclined, my best suggestion is to take it to your favorite mechanic. This way he can do a fuel pressure test on a cold start up and a warm engine after-wards. This shouldn't run you no more than 50$.
But it sounds like the common Grand cherkee problem, that is the ECM over heats and kills off the fuel line circuit in hot conditions. The easiest way is to go to autozone and purchase a new ECM and see if this fixes the problem. If it doesn't then you can return it.
As to locating the sensors a 25$ Haynes manual will show you the location to most if you want to try and save money and diagnosese/ and fix this your self.
Jeeps are well know to loose the Crank shaft sensor and not throw a code. This sensor is in the bell housing between the motor and transmission, once again Haynes manual will show you how to replace it. Go O.E.M on your Crank sensors, never found an aftermarket one worth the two or three dollars more for O.E.M.