Thread: so frustrated with this car

Originally Posted by rocknnachos

You said "theres spark coming from the coil both sides." If so, then your problem at cyl #3 isn't spark. Next thing you wanna do is see if the injector is getting pulse. If you're getting pulse and spark, then you most likely have a compression-ish issue or the injector is flaking out.

So lets make sure that you have spark and pulse.

Follow this guys lead. He knows what he's talking about.

The injector signal can be tested with a DVM set on "Duty Cycle". This is an easy way to measure pulse width. Take note of the stability of the signal. Get a reading from one of the other known good injectors and compare it to the reading from #3.

If the injector signal is good then the PCM is probably good. Move on to a compression test. If the compression test is good then I would probably replace the ICM or install it on one or your freind's cars and see if their car produces the P0303.