Hard Start

Definition: Engine cranks OK, but does not start for a long time. Does eventually run, or may start but immediately dies.
^ Perform careful check as described at start of Section B.
^ Make sure driver is using correct starting procedure.
^ CHECK:
- TPS for sticking or binding or a high TPS voltage with the throttle closed (should read less than .700 volts).
- High resistance in coolant sensor circuit or sensor itself. See CODE 15 CHART OR with a "SCAN" tool compare coolant temperature with ambient temperature on a cold engine.
- Fuel pressure CHART A-7.
- Water contaminated fuel.
- EGR operation. Be sure valve seats properly and is not staying open. See CHART C-7.
- Ignition system - Check distributor for:
Proper Output with ST-125. Worn shaft. Bare and shorted wires.
Pickup coil resistance and connections. Loose ignition coil ground. Moisture in distributor cap.
^ If problem exists in cold weather, cheek cold start valve. See CHART A-9.
^ A faulty in-tank fuel pump check valve will allow the fuel in the lines to drain back to the tank after the engine is stopped. To check for this condition:
Perform Fuel System Diagnosis, CHART A-7.
^ Remove spark plugs. Check for wet plugs, cracks, wear, improper gap, burned electrodes, or heavy deposits. Repair or replace as necessary.
^ If engine starts but then immediately stalls open distributor by-pass line. If engine then starts and runs OK, replace pickup coil.
^ If engine starts and stalls disconnect MAF sensor. If engine then runs and sensor connections are OK, replace the sensor.