90-823225--1 10965E-128 - ELECTRONIC FUEL INJECTION (MULTI-PORT AND THROTTLE BODY)
CUTS OUT AND MISSES (continued)
CHECK SENSORS AND CONTROLS FOR:
1. Open or grounds in CKT 417 Throttle Position (TP) sensor signal.
2. Open or grounds in CKT 416 Throttle Position (TP) sensor 5 volt reference.
CHECK ENGINE MECHANICAL FOR:
1. Proper cylinder compression.
2. Bent push rods, worn rocker arms, broken valve springs, worn camshaft lobes. Repair or replace
as necessary.
ADDITIONAL CHECKS:
A misfire can be caused by Electromagnetic Interference (EMI) on the reference circuit. EMI can usu-
ally be detected by monitoring engine RPM with a scan tool or a tachometer. A sudden increase in
RPM with little change in actual engine RPM change, indicates EMI is present. If the problem exists,
check routing of secondary wires, check ground circuit.
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