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  #1  
Old 10-12-2010, 10:01 PM
bazooka98 bazooka98 is offline
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Default cylinder misfire on number 5 help

my 5.9 keeps misfiring. i looked on the internet and found out thats a common problem. ive changed the plugs, spark plugs wires, cap and rotor, coil pack, crankshaft position sensor, and the tps sensor. but it still keeps misfiring. does any 1 have any ideas on what it can be???????
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Old 10-13-2010, 08:40 AM
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Time to start looking for a mechanical reason rather than an electrical reason. Could be a broken valve spring, lack of compression, clogged injector or a blown head gasket/cracked head. Try swapping the #5 injector with one from another cylinder and see if the misfire moves with it. If not, have a leak down test done on that cylinder.
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Old 10-13-2010, 08:34 PM
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i swaped the injector but its still misfiring. i dont think the head gasket blown but im going to check the compression next week.
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Old 10-23-2010, 11:49 AM
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Default I have the same issue - code P0305!

I have the same issue right now.

The plugs, wires and cap were replaced recently. So IF its the head gasket would there be any exterior leaks?

Also, I have noticed when driving around 50-60 mph the rpms want to jump from 1600 up to 2000. It's NOT going in and out of OD, just revving. It will do this 2-3 times in a row then goes a little ways then does it again.

Are these issues related?

How expensive is this or is it time to put on Craigslist?
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Old 10-23-2010, 10:28 PM
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P305 = Cylinder #5 Misfire

Causes

A code P0305 may mean that one or more of the following has happened:
  • Faulty spark plug or wire
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Running out of fuel
  • Poor compression
  • Defective computer

Possible Solutions:

If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs
). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.
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