Just picked up an '02 SE with 124k miles last week. Drove it around for a few days and got a P0303 code (cylinder 3 misfire). The car would still run rough and drive, so I ordered plugs and coil packs. Yesterday I switched out the head unit with a Pioneer head unit. I left the battery attached and blew the audio fuse. Replaced the audio fuse but now the car will not start at all.

It cranks and fires up for about 1 second then dies, even if I give it gas it will not stay running for more than 1 second. It seems like a fuel system issue to me. Is there another fuse I could have blown that would leave me in this situation. Could a P0303 code cause this? Anything to do with the radio install, or just coincidence?

 

The P0303 code has nothing to do with this, and everything to do with the radio install. IMO, you blew a fuse, relay or fusible link. Start checking.

 

both 80A main fuses look like this, blown?

 

Check the fuse for sure. But first disconect the negative on the battery

 

That 80A fuse was good, fuel pump fuse is good. Next thing I should check is fuel pump relay? Or are there other fuses/relays that come to mind? Is the fuel pump relay behind the drivers side kick panel?

 

Fuel pump relay is good, fuses are all good as far as I can tell. I'm going to try the other relays under the hood.

 

have you look at the fuse on the battery positive terminal?

 

It looks intact, I actually broke it trying to get it out so I cant test it now. Wouldnt that cause nothing on the car to work electrically? As far as I know everything on the car works except what appears to be the fuel pump.

 

okay so the fuel pump is definitely getting power. I just took the back seat off and listened to the pump fire up.

 

Did you pull any codes? Issue sounds like it's related to your stereo install though.

 

turned out to be P1122 and P1126-open throttle body motor relay, only one I didnt check yessterday because it was such a pain to get off. Anyways, turned out to be a good excuse to buy an OBDII screener.

Thanks guys.