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P-0302 #2 Misfire and Neutral Relay Switch

 
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Old 08 Jun 2016, 12:14 pm
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Default P-0302 #2 Misfire and Neutral Relay Switch

I have a 2009 2.4L Base Model

#1 Problem P-302 Misfire #2 Cylinder
Replaced Plugs and Plug wires.
Replaced Ignition Coil
Next on my list, Compression test and Fuel Injector Check.

#2 Problem
Started the car in the A.M. last Sunday ok. But when I tried to start it later nothing no crank /no start Some one suggested to try and start it in neutral and voila it started.
I was told my Neutral Relay switch was bad so I replaced it.(not an easy thing to do)
Started ok this morning in Park. So hopefully this one behind me.

Seems to shift ok but still have the #2 misfire that I am working on.
If anyone has any other suggestions please let me know.
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Old 08 Jun 2016, 03:55 pm
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Smile Re: P-0302 #2 Misfire and Neutral Relay Switch

With a couple of exceptions, my experience of regular misfire codes being thrown on the PT, have invariably ended up being burnt/ leaking valves
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Old 08 Jun 2016, 04:06 pm
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Default Re: P-0302 #2 Misfire and Neutral Relay Switch

Try cleaning your IAC. Sometimes if they're dirty, they'll cause a misfire code. Damned if I know why.
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Old 08 Jun 2016, 05:18 pm
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Default Re: P-0302 #2 Misfire and Neutral Relay Switch

You might have a dirty fuel injector. Suggest using some Techron fuel injector cleaner that is safe for CAT.
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Old 08 Jun 2016, 07:02 pm
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Default Re: P-0302 #2 Misfire and Neutral Relay Switch

Will using a cleaning problem fix this or do I need to go into the cylinder head to repair.
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Old 08 Jun 2016, 07:03 pm
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Default Re: P-0302 #2 Misfire and Neutral Relay Switch

Sorry I meant to say
"Would using a cleaning product fix this problem?
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Old 08 Jun 2016, 07:22 pm
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Default Re: P-0302 #2 Misfire and Neutral Relay Switch

Quote:
Originally Posted by TerreA View Post
Sorry I meant to say
"Would using a cleaning product fix this problem?
I used this Techron fuel injector cleaner and it solved my P0303. I can't guarantee it but its worth a try and you don't have to get your hands dirty.
You just put it in the fuel tank after filling it up. Just make sure it says its safe for CAT.

http://www.ebay.com/itm/like/1419664...&ul_noapp=true
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Last edited by ptcruisersteve; 08 Jun 2016 at 07:26 pm.
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Old 09 Jun 2016, 08:17 am
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Default Re: P-0302 #2 Misfire and Neutral Relay Switch

Techron is good stuff. And you can purchase it at your local Walmart. No need to pay the extra at an auto parts store.
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Old 09 Jun 2016, 09:30 am
Fk5 Fk5 is offline
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Default Re: P-0302 #2 Misfire and Neutral Relay Switch

Quote:
Originally Posted by TerreA View Post
Sorry I meant to say
"Would using a cleaning product fix this problem?
Depends. What is the problem? There are a bunch of things that can cause misfire codes.
  • Ignition - could be plug or wires. That is an easy fix. Just swap one plug with another and one wire with another. Keep track of what you put where. If the code follows the plug or the wire you've found your problem. If it stays at cylinder 3, keep looking.
  • Fuel - Could be a dirty or bad injector. If you get lucky running some cleaner through it like techron will fix it. You just follow the directions and dump it into the tank. If not, I would pull the rail, check the o-rings and swap one injector with another. If the code follows the injector you've found your problem if not, keep looking.
  • IAC- the cleaning the IAC advice people have been giving you isn't very invasive. You take it out and spray cleaner on it. Wipe it off and put it back. There are tests you can run with a multimeter too. Youtube and google have tons of instructions for doing this, as Nitro always points out, be careful where you get your advice from.
  • Other potential problems are sensors like the cam position sensor or a vacuum leak, especially around the cylinder with the misfire. When you (or whoever) changed the plugs did they pull the intake plenum? If so, was the o-ring (it's really kinda square) at that cylinder look flat? Did you replace it?
  • Do a compression check. If that cylinder comes up super low (I think double digits means you're screwed) THEN you will need to start looking at engine internals and serious work.

On edit I see that you already attempted the ignition fixes. In that case I would run a can of injector cleaner through it and look for vacuum leaks. Clean the IAC. It's pretty simple to do.
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Last edited by Fk5; 09 Jun 2016 at 09:51 am.
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Old 09 Jun 2016, 09:56 am
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Default Re: P-0302 #2 Misfire and Neutral Relay Switch

Well welcome to my drama.
yesterday I got codes PO700 and PO740.
I have heard this sometimes happens if you replace the PRT
Someone told me that if you pull the valve body you need to go and have the Quick Learn process done to the TCM.
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