Question about 1999 Jeep Cherokee

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1999 Jeep Cherokee(4.0-6 cyl)/Starts fine when COLD ,after running awhile starts hard(coughing and sputtering while pumping gas pedal ,then idle catches(reving high until returning to normal idle?Also while engine is warm,sitting in PARK a little while it will start to cough and sputter until stalling out ?

Posted by Keith Zuch on

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Warwick Wright

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  • 63 Answers

Wrong fuel octane water in fuel...

Posted on Jan 01, 2018

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Anonymous

  • 702 Answers

SOURCE: Stalls when engne warms up

Your ECT (Engine Coolant Temp) sensor is bad. What's happening is at cold start it richens up the fuel mixture and as it warms up the ECM thinks it's still cold and essentially the "choke" is still on. Also check your coolant level. If you don't have enough coolant in you engine/radiator, the ECT doesn't know what to do so it thinks it's cold.

Posted on Jul 13, 2008

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Anonymous

  • 512 Answers

SOURCE: 1999 jeep cherokee starts hard

have fuel pressure checked ...fuel pump maybe losing prime

Posted on Sep 28, 2008

martyf

  • 1 Answer

SOURCE: 1996 Jeep Grand Cherokee stalls when brakes are applied

My 2000 Grand Cherokee had the same problem, without all the sputtering, it would just die approaching a stop. We could only keep it running by slightly pushing down on the gas petal when coming to a stop. I replaced the Throttle Position Sensor, but that didn't change anything. A new mechanic I found replaced the Idle Air Control Valve, and we've had no problems in a week.

Posted on Jan 02, 2009

bunnydawg

Roberta Smith

  • 5158 Answers

SOURCE: 95 jeep grand cherokee, hard starting, backfires, when cold

get a couple bottles of gas line antifreeze .. if you don't already use it and add it to the gas.

Robert

P.S. in minus 40 i don't even get out of bed... minus 23 here last nite... isn't winter grand

Posted on Jan 21, 2009

Jonah Oneal

  • 14092 Answers

SOURCE: after running the engine for awhile in stop and go

CHECK COOLANT LEVEL.CHECK THERMOSTAT.IF TOP RADIATOR HOSE DONT GET HOT IN 10 MINUTES AFTER FIRST STARTING CAR IN MORNING .AND JUST THE BOTTOM HOSE.THERMOSTAT STICKING CLOSE.IF THERMOSTAT FINE.PROBLEM COULD BE CLOGGED RADIATOR OR ENGINE BLOCK CLOGGED OR FAULTY WATER PUMP.

Posted on Aug 01, 2009

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The iac would be my first guess but this troubles me as the when the engine is cold all the sensors are ignored until the fuel system goes into "open mode" but to change the iac is simple 2 screws and unplug the module and instructions come with a new one to tell you how far the air pintle is supposed to be set at,
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My 2000 Grand Cherokee had the same problem, without all the sputtering, it would just die approaching a stop. We could only keep it running by slightly pushing down on the gas petal when coming to a stop. I replaced the Throttle Position Sensor, but that didn't change anything. A new mechanic I found replaced the Idle Air Control Valve, and we've had no problems in a week.

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Regards Johngee10

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