Question about 1997 Jeep Grand Cherokee
Problems that occurr and disappear erratically are often caused by bad wiring.
In your case, if problem is stalling when idling and during startup, parts that are likely involved are those determining the balance of fuel/air mixture.
This kind of symptoms are commonly caused by weak wiring to MAP/MAF sensor (MAP on the 97 engine). This often results in error code stored.
If problem is only at cold, check IAT (idle air temp) sensor, also located in the air intake, check the idle air control valve.
Check crank sensor wiring harness. This is also common cause for the problem.
Check wiring to injectors and high voltage wires from distribution to spark plug. If any of these is the problem, then you will get a misfire code stored in ECM (main computer module).
If the car also drives very rough and is revving up and down in a weird way, check the EGR valve.
The fuel pump wiring may also be responsible. In that case you will get a lean mixture code if you do an error scan.
The two connectors to ECU must be tested, just in case. If instrument panel comes on and if there is no additional problem, this are hardly related to the problem.
If wiring is OK, check the vacuum system and try cranking with gas tank cap off. Vacuum system is tested using an hand tool gauge onvacuum lines while spraying card cleaner on the hoses (or heating them with a torch). If there is a leak, pressure will go up. A big leak will also do hissing noise, and will often result in a lean code when doing an OBD code scanning.
As first thing I would do a code scanning. This car is OBDII. The scan can be done for free at the nearest Autozone, or for a small fee at any garage.
If you get any OBDII code from the scan, report it here, so that we can isolate further the possible reason for the problem.
Posted on Oct 16, 2010
Component check sequence:
1. Ignition system / ignition timing. When engine is stalled, see if spark plugs scintillate if another person cranking. If not, then ignition system is bad.
2. Fuel pressure. When engine is stalled, see if fuel flows correctly if another person cranking. If not, then check and replace the fuel filter if necessary. Also verify the fuel pump if it's electrical supply is all right, and replace the fuel pump if necessary.
3. Heated oxygen sensor control.
4. Engine Control Module (ECM) - supply / earth.
5. Throttle position (TP) sensor.
6. Manifold Absolute Pressure (MAP) sensor.
7. Idle Air Control (IAC) valve.
The best idea is to scan the ECM memory by internal Diagnostic Trouble Codes (DTC) stored, using a diagnostic scantool connected to the data link connector of the car, in order to find out the bad piece(s) which stalled the engine. You must find out the root cause of the engine stalling, and this is the reason for using a diagnostic scantool.
Posted on Oct 16, 2010
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Posted on Jan 02, 2017
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