OK finally finished with the new head install... and as soon as I started it up my service engine soon light came on.. I went down to Auto Zone and borrowed their code reader. It came up with a code P0304-#4 cylinder misfire. So far I have changed all plugs and #4 twice( Bosch Platinum +4). I did put on a new coil pack and new sparkplug wires, these also check out fine with a Ohm's meter and still the same code. This morning after running great all weekend it started to run on 3 cylinders after it warmed up OK, also the service light started to blink when it began running on 3 cylinders . I took it home and parked it and when I came home that afternoon it started and runs smooth as ever now abut still the service light. Also the ABS/DSC/TIRE SENSOR LIGHTS also come on full time. I do know this is the MAP sensors. So any Idea what could be the problem.

 

I think the first thing to try would be to put the old leads and coil pack back on - just to eliminate them as a possible fault.

 

is the new head install a necessity or modded for more power ? and is the issue with # 4 new? i had the exact same crap happen with a bad coil from screamin" deamon .

 

Yes new modded head. And yes also to it being a new problem. I think I'l try putting on the old coil and wires just see. and if then I wonder if it's the #4 injector...That may be my excuse to put in JCW's...

 

Make sure the fuel injector wiring harness connector on the passenger side of the car is connected properly and the contacts are clean. Check the connections to the injectors, also.

Steve

 

The above reqs are great. How many miles on the new head? I had a short term cylinder #1 misfire when I put my new head on and new pistons. Once I got a few miles on the car though it went away and has gone away. Stock cam or Schrick?

Is there a local place where you can have the injectors tested? Make sure they are able to flow the rated amount (380cc, ro whatever you have).

The only other thought I have is make sure you are hooked up properly for firing sequence on your coil. Seems stupid, but an easy fix/mistake to make....

Good luck!

 

there is a fantastic service place for injectors made mention here by a nammer . i'll find the bookmark , hang on ... okay; it's witchhunter performance they'll do the mini's injectors ( clean and balance) for 60.00 . nice huh?

 

sweet deal. I may do this to my stockies just so they can be "stored" and re-used down the road in some project

 

Well I went out driving last night and all of a sudden the Service light went out on it's own... This morning started it up and Voila, the lights gone.. I guess all it took was to cycle the original misfire out.. Annnddd under when it rains it pours catagory.. I did find a nail in my Parada front tire...Thank You to all who responded. This really is the best Car Specific Forum on the web...