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Old 11-27-2008, 02:21 AM   #1
kev-de
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Default multiple/random misfire code P0300


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I have recently baught a non running engine and rebuilt the engine. At start up it ran rough and threw a code of P0300 random/multiple misfire. It has a new cap, rotor, wires, and plugs. Has any one else had any simular issues? Could it be some other sensor? I plan on testing the cam, crank and knock sensors. I have replaced the fuel pump, fuel injectors and all the internal parts of the engine. Not sure where to start. I also had to replace the ignition key, key was lost. Thanks
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Old 11-27-2008, 09:27 AM   #2
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sounds like the distributor is off a tooth or two, but it could be other things as well.

others will be in to help Im sure.

welcome to the forum,
Pete
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Old 11-28-2008, 08:58 AM   #3
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distributor replacement i critical. i'd go there first.
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Old 12-02-2008, 04:53 PM   #4
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Thanks for the info, I moved the distributor both way a tooth and it was worse. Do you think it could be the crank or cam sensors? Why would you replace the whole distributor? Any help would be great. thanks
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Old 12-02-2008, 05:03 PM   #5
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hmmm...

everything go OK with the engine rebuild? tell us more of what you did and stuff and we'll keep looking to help you.
did you get new rings, pistons and everthing in the engine? heads still stock? same cam etc?
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Old 12-02-2008, 05:33 PM   #6
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i meant resettting of dist. proper resetting of timing must be done with a scan tool.
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Old 12-02-2008, 05:34 PM   #7
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the internals of the distributor are actually the cam sensor itself, thus resetting reqires a scan tool.
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Old 12-02-2008, 06:11 PM   #8
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A little history on the engine. The guy I bought it from ran it low on oil and kept driving it. on the tear down all the main bearings were spun as well as the cam bearings. sent the block to the machine shop and had it bored 30 over, had to buy a scat crank, the old one was to far gone. Had the crank balanced. All the internals are new with the exception of the cam and lifters which had 10,000 miles bought on e-bay. The cam was also too far gone. There was no cam sensor in the distributor and replaced it with one that the guy I bought it from said it came from a running engine. It has new spider injuctors, new cap, rotor, and wires. Set engine at top dead center and lined up the distributor with the number 8 on the housing. The onlything else I replaced was the ignition switch because of a lost key. I get a code o P0300 and once in a while I get P1345. I am thinking about taking it to the shop and have a diagnostic run on it. please help, thanks
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Old 12-03-2008, 07:30 AM   #9
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Do you get the codes in idle or while driving?
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Old 12-04-2008, 05:43 AM   #10
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I got the P0300 at idle and the P1345 while driving. It barely stays running. It seems to smooth out a little bit at higher RPMs. One thing I forgot to add is I did not get the heads reworked and after start up I notice the exhaust was sucking back in at the tale pipe, must be a stuck valve or two.
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