Engine Mechanical problem
1993 Jeep Cherokee 6 cyl Four Wheel Drive Automatic
My Jeep has a strange problem. It starts great, runs great for just a minute or 2, then cuts off and won't start again til maybe the next day. We can hear the fuel pump come on so we know its not that. We have changed out the fuel filter, the distributor cap and rotor button, and checked all connections. My husband thinks it may be a fusable link somewhere. Any ideas?
Is your check engine light on? If yes turn the key from off to on three times, on the fourth one leave it in the on position, count the flasshes.22 would flash as 2 blinks, then a short puase, then 2 more blinks. If several codes are stored, the pause is longer between codes, code 55 will be the last code. Do this and post all codes found.
July, 1, 2009 AT 10:01 AM
The check engine light is not on.
July, 3, 2009 AT 4:45 PM
Start with the basics, and work your way up, Last tune up was? Wires plugs ALL filters? If all that is ok, check for a stuck EGR, then test fuel pump pressure, If it won't restart, determine what's missing, the engine needs three things to run, Spark at all plugs, gas to all cylinders, and compression in all cylinders, tho an engine may run lacking one in one cylinder, it won't run very well! http://www.2carpros.com/car_repair_video/test_fuel_injection_pressure.htm
Go here and checkout our video. http://www.2carpros.com/car_repair_video/test_engine_ignition_system.htm
and this one!
If the check engine light is on, read the codes, the computer is trying to point you in the right direction.
Readers can be purchased by following the link in my signature file, this is a must do step for all computer controlled cars.
1. Ensure battery has a minimum of 12.5 volts (9.5 cranking volts) available to operate cranking system. Ensure battery cable connections are clean and tight. 2. Using an analog voltmeter, backprobe the following wires at the distributor. Touch positive lead to Tan/Yellow wire (Gray/Black wire Grand Cherokee). Touch negative lead to Black/Light Blue wire. 3. Set voltmeter to 15-volt DC scale. Crank engine. If voltmeter needle does not fluctuate between 0-5 volts, check related circuits. If necessary, replace camshaft position sensor. If camshaft position sensor is okay, but engine does not start, see G - 2.5L & 4.0L TESTS W/CODES article in the ENGINE PERFORMANCE Section and check PCM. NOTE: Perform SECONDARY SPARK under IGNITION CHECKS before proceeding with test.
SECONDARY SPARK Spark Test 1. Remove coil wire from distributor cap. Hold end of cable about 1/4" from ground. Crank engine. Spark should be present and constant. If spark is not present and constant, check coil and coil wire resistance. Perform IGNITION PRIMARY test under IGNITION CHECKS. 2. If coil wire spark is present, ensure spark reaches spark plugs. Check condition of rotor, cap, spark plug wires and spark plugs. Repair or replace if necessary. Spark Plug & Coil Wire Resistance Resistance should be 250-1000 ohms per inch. Use insulated pliers to avoid getting a nasty bite!