2G Cylinder 3 misfire..only when started up cold

[dsmAB]

The car when started from cold would idle rough and give me the CEL code P0303 (cyl. 3 misfire). It still idles but obviously very rough..

However, when i let it idle rough for about 30 seconds (AFR cycles around 19:1) and shut the car off and then start again, it only misfires for the first little bit and then starts running normally.

I recently had to replace my CAS, and also tested the coilpack, power transistor while i was trying to diagnose my previous problem. Also I put in new plugs (gapped correctly) and wires when i changed the CAS..

I did get new injectors from classifieds and that is my guess on whats causing this misfire in cylinder 3. But my question is that can a injector be affected by temperature? I also checked to see if i wasn't getting spark to cylinder 3, but it seems to be perfectly fine.

Any input would be greatly appreciated guys!

 

[boost97gst]

A lot of things can be affected by temp. Usually when things get hot(electronics) is when they show failures.

Do a quick compression test.
Also, take a 9v battery, piece of rubber hose that can fit around injector top, some carb cleaner and alligator clips. This is the "poor mans injector cleaning" ha. And it works. Its NOT a proper flow test obviously but may help you identify a problem. THEN you can send them off for the real deal cleaning and flow test

 

[bmxfelon420]

Also you can swap injectors and see if the miss moves. You can swap the adjacent cylinders plug wire that fires at the same time to test ignition

 

[BlackDSMthingy]

I would also see if you could check fuel pressure and compare it to spec. Anything from a bad pressure regulator, weak pump or clogged fuel filter may do this as well.

 

[dragon181]

I would also swap plugs around, have had new plugs that were bad