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Just got my new engine put in and im getting a P0300 which is a random misfire in all cylinders... so its time to put in some ac delco rapidfires, but i dont want the stock heat range plugs, id really like to get a degree colder plug to help KR with my mods... stock part number for 96-97 DOHC is #12 right? so #9 r a degree colder right? thanks
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\'97 Monte Carlo Z34- Milzy Motorsports 2\" Headers, 2.5\" Mandrel Exhuast, Ported & Polished Upper & Lower Intakes, Ported Intermediate Arm, NGK TR55\'s, DHP PCM, 180* T-stat, EGR Delete, GM STB, GMPP Trailing Arms, & Coldz CAI w/ K&N cone. -
RE: Plugs
Hello
Delete the PCM codes and try again.
If the engine didn't run perfect after starting up again you will get a random missfire code.
OBD II sences the accereration speed of the crankshaft after each ignition event and will set a code if they are not evenly spaced.
When OBD II was first intoduced it would set a random misfire code if your vehicle was being driven on a wash board road with the torque converter clutch locked up, because of the tires having un-even rotational speeds, that would back feed through the transmission to the crankshaft and cause rotational fluxuations because of the locked up torque converter, if the torque converter was un-locked no code would set.
OBD II is very critical of the crankshaft acceleration rate from each of the cylinders power pulses during rotation.
Hope this Helps
John
P.S.
I also have a 97 Monte Z34 -
RE: Plugs
well i just had a new engine put in and im sure they are the original plugs in there so i was going to change them out anyways... the new engine has almost 60k miles on it\'97 Monte Carlo Z34- Milzy Motorsports 2\" Headers, 2.5\" Mandrel Exhuast, Ported & Polished Upper & Lower Intakes, Ported Intermediate Arm, NGK TR55\'s, DHP PCM, 180* T-stat, EGR Delete, GM STB, GMPP Trailing Arms, & Coldz CAI w/ K&N cone.Comment
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