Misfire

jenifers

van broke down recently. It was throwing codes, PO303 for cylinder 3 misfire and PO141 O2 sensor. Just took it to chevy garage today and they told me they "think" its a fuel injector. # 3 plug is bone dry. They want 500 bucks to replace fuel injector. Van has a misfire but will run.

leakmaster1

Sounds like a bad injector, the O2 sensor. code should go away after you replace the injector. Call around, $500 sounds a little steep for a small job like this.

thecardoc3

leakmaster1 said:

Sounds like a bad injector, the O2 sensor. code should go away after you replace the injector. Call around, $500 sounds a little steep for a small job like this.

Small job? I suspect you have never done this repair yourself. The flat rate time is 3.8hrs for one injector, and 4.2 for all of them. The upper intake manifold has to be removed for access and that's not a lot of fun on a Venture Van. In fact that's probably why there is some doubt as to what has failed at the point that the O.P. wrote in and asked for help. The injectors share power inputs but all have their own ground command circuits at the PCM. With most of them being triggered, that confirms that power is available to that splice in the harness, but nothing else on the engine side can be determined without removing the upper intake. It "could be" that an injector that has failed open or it could be a harness or connector issue. The only thing that could be proven right now is whether the PCM could command that injector to fire if the rest of the circuit was intact.