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A question about testing fuel injectors

posted by  Dave Stevens on  Thu Oct 29 01:07 CST 2020
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last visit: Sun Jan 1 02:36 CST 2012
[RELATED]

Before you get all excited about wanting to pull injectors and checking spray patterns, there's a simple test you can perform at the Diagnostic Link Connector to verify all the injector solenoids are at least trying to operate normally. See the 700/900 FAQ here under Engine: OBD Diagnostic Codes. Diagnostic Test Mode 3 (on port 2) is used to get the ECU to exercise some of the system components in a continuous cycle, among them the IAC valve (goes tick-tock), the electric fan (low then high) and pulsing the injectors (tick-tick-tick). You can put your hand on each injector in turn to sense if it's operating and at a similar intensity to the others. If you still suspect an injector problem then refer to the Fuel Injector topic in the FAQ in the Engine: Fuel Injection section. Pulling and testing an injector to casually check spray pattern and volume used to be a whole lot easier in the old CIS systems. Fortunately the newer pulsed injector systems have very few injector problems and such testing is rarely needed.

--
Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now






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