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1996, Jeep Grand Cherokee, 4.0 - Engine stalls at different times, different RPMs, may run good for weeks that not run right for days. Have new crank sensor, rebuilt JTEC/PCM, all good grounds, checked PCM and has no faults, help! I am a master tech, have been working on all tyeps of cars for many years. I have fuel pressure up till after engine shuts down, and using Snap On Modis scanner all sensor readings and PCM perameters are normal up until the engine dies and then flat line for most sensor values. It is like the ignition switch is turned off with out loss of power to PCM. I have checked each sensor value with mulit meter, Ohms on all wiring with in specs, less that 0.5 from sensor pin to PCM, all PCM and sensor connections good....what else could be the issue?
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You replace sparkplugs,plug wire,tps,map,cap and rotor.Thats good,If the vehicle runs and you come to a stop and it stalls,That is the IAC (Idle air control) you say it ran fine for a week now its acting up, Service the IAC or get it replaced.
it looks like your engine is having an over rich fuel mixture maybe, thatswhy when you press the pedal to the floor it starts becouse you allow lots of air to help clean the mixture while cranking, also you should have black smoke in the tailpipe until it cleans up and runs fine, i think youre having a leak in one our more injectors you should check them first for proper seal under pressure these is done in an injector test machine, second it may be a defective map sensor these trucks some times have a bad map and dont give a MIL (malfunction indacator lamp) and last but more rare to be is a blocked fuel pressure regulator chek fuel pressure it should be between 38 and 45 psi and it shoul hold these pressure when you turn off the engine if pressure drops fast its injector seal problems or fuel pump check
Most times the symptoms you have are the beginning stages of either a fuel pump failure, crank position sensor or a bad ignition switch. Unless you catch it at the right time though, it will be difficult to diagnose (this is the part that shops hate the most...when testing will show everything is good but everyone knows its not.) Hopefully it may have set a stored code which will make that easier.
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