Question about 1997 Jeep Cherokee Country

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Power i ain't got no power to the fuel injectors or spark on the plugs i was driving home it was fine then next morning it wouldn't start i replaced fuel pump and stuff all the plugs and wires dis cap and rotor button got power to every thing else but that

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You dont say if no power whilst cranking or static ?sounds like a poss fuel pump relay fault if you say u have no power to injectors, what did you check power with ? a test lamp or multi meter ?the ecu switches the earth off & 0n to achieve switching, but if now power would suggest fuel pump relay fault, but a tachomatic relay (receives signal from coil to kick in relay) if basic fuel pump relay it may have a crash sensor that has tripped and needs resetting. ford had them in the boot , rovers had them up dash by radio , jags had them centre console fiats pass footwell.
silly qustion, is the vehicle safe guarded by a chipped key system? if so has the key been damaged /fell apart ? you may have lost electronic chip! this on most cars will allow cranking with no power to pump or ignition system. good luck

Posted on Sep 01, 2008


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The fact that you could run it home is an indication that the fuel system and spark are working. That assumption leads into a single component failure. It is either a fuel injector that has decided to stick open. Or a fuel injector circuit that has failed and is supplying continues power to one injector, or a pressure regulator whose internal diaphragm has failed and fuel is leaking past the diaphragm and up the vacuum hose into the air inlet manifold.

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