Hard to Start

DESCRIPTION
Engine cranks OK, but does not start for a long time. Does eventually run or may start but immediately dies.

INSPECTION
Perform careful check as described in When To Use This Section. Make sure driver is using correct starting procedure.

Check
TPS for sticking or binding or a high TPS voltage with the throttle closed.

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 Test, Chart A-7. Also Check for Water contaminated fuel.

EGR operation. Be sure valve seats properly and is not staying open, See Chart C-7A.

Ignition system
Bare and shorted wires and proper output with spark tester J 26792 (ST-i 25) or equivalent.

Idle Air Control (IAC) Valve operation - See Code or C-2B charts.

Remove spark plugs. Check for wet plugs, cracks, wear, improper gap, burned electrodes, or heavy deposits. Repair or replace as necessary.


Fuel system
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.