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P0300 (intake leak?) after changing plugs, wires, coil

 
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  #1 (permalink)  
Old 04 Dec 2016, 11:46 pm
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Default P0300 (intake leak?) after changing plugs, wires, coil

Last night, I replaced plugs and wires on my 2008 base PT.I was throwing a P0303. Drove it today, ran much better, then at end of the day (probably drove 80 miles or so across 5 hours), threw P0303 again.

I decided to change the ignition coil, picked one up at Oriely's. Put it in, started it up and ran way rough, after a few minutes engine lite came on and said P0300.

Now when I put back the intake manifold, I noticed what seemed to be rings of oil where the gaskets would be.. I wiped it off (I'm not a mechanic, but trying to learn).

When the engine runs, I can hear what appears to be a leak near the intake. I'm guessing I need to replace the upper gaskets? I suppose it could be a bad coil, I didn't put the old one back in, but if someone things that'd be a good idea.. am willing to try.

Looking for ideas, I'm planning on getting gaskets tomorrow. Anything else I can be looking for or doing?

Thanks in advance.
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Old 05 Dec 2016, 12:54 am
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Location: Amboy, Indiana
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Wink Re: P0300 (intake leak?) after changing plugs, wires, coil

Well your initial code P0303 is a cylinder misfire code for #3 cylinder. After performing the replacement of the parts you mentioned you now have a P0300 which is random multiple misfire. I believe the second code you may have introduced during your parts replacement and may not be related to the initial issue that I believe may still be the main issue. As far as the P0300, double check your wiring to each cylinder plug, make sure it is correct and each wire is on the correct plug. Also closely look at all the connections both electrical and vacuum related that you had loose when removing the upper intake. The leak you hear may very well be a vacuum leak, could be around the gaskets for the upper intake but look closely at your line connections that you had off to change the coil. If you do remove the upper intake again I would suggest a compression check be performed since it will be convenient to do so at that time. If you have a compression gauge of course or you can get a loaner from an auto parts store. I would strongly suggest doing as much testing as you feel comfortable with and steer clear of buying anymore parts until you have evidence to warrant the purchase. If you need further assistance many on here can help. All the best and report back with your findings and/or questions.
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Old 05 Dec 2016, 01:11 am
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Default Re: P0300 (intake leak?) after changing plugs, wires, coil

Multiple Cylinder Misfire

Possible Causes:

1. Fuel system problems exist
2. Erratic Camshaft or Crankshaft Sensor signals
3. Ignition system problems exist
4. Engine mechanical problems exist
5. PCM has failed

Since P0300 is a generic code I would suggest resetting this code and see if it comes back.
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Old 05 Dec 2016, 03:11 am
_PTGT03's Avatar
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Default Re: P0300 (intake leak?) after changing plugs, wires, coil

The most likely cause of the fault is a vacuum leak caused from your latest repair.

There is a specific bolt tightening sequence and specification of torque for the upper intake and if it was not performed exact or correct you could have introduced a problem. you must refer to the correct technical documentation when working with engines.

What you can do from here on is to rig up a shop-vac in reverse to your intake with a clamp holding the throttle plate open to allow the air to flow. this will pressurize your intake and with a soapy water spray bottle mixture, you spray along the joints in the intake manifold to find the exact location where the problem is. from there, you can fix the problem. you can also stick a rag in the exhaust pipe to allow more pressure to build up.
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Old 05 Dec 2016, 09:33 am
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Default Re: P0300 (intake leak?) after changing plugs, wires, coil

Thank you for all your comments and suggestions!

I did read the manual prior to repairs (and watched a few videos). I did tighten and torque the intake in the proper sequence.

I'm going to double check all of my work today (ensure I have plugs on the coil properly, will search for leaks.

One thing I did notice, is in all the videos, the intake gaskets were puffy and orange, they looked fairly substantial (compared to mine). My gaskets look almost sunken in and anemic. I know one of the suggestions was not to replace any more parts, but I'm going to replace those today, just in case... The plugs and wires appeared to be original (car has 87k miles).. I'm probably guessing those gaskets haven't been replaced yet either.

I'll post an update on the thread later today. Worst case, I may have to take it to a shop (get it toed, runs way to rough in present state)
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Old 05 Dec 2016, 11:01 am
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Default Re: P0300 (intake leak?) after changing plugs, wires, coil

The 1st question to always a is how the DTC was retrieved.

I can tell you we get so many DIY's that come to the shop with problems they cant solve ..yet start telling us how to solve them..???
Mostly because of poor diagnostics's.!

BTW for all reading this, even numbered DTCs i.e. p0300, p0700, etc., are the worst to start thinking about what the issue is. They lead to anywhere,nowhere and everything.
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Last edited by NitroPT; 05 Dec 2016 at 11:03 am.
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Old 05 Dec 2016, 01:40 pm
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Default Re: P0300 (intake leak?) after changing plugs, wires, coil

Thank you NitroPT and everyone else who replied on this thread, I do appreciate it.

Here is an update, and am looking for suggestions as to next steps...

I replaced the intake gaskets (they really needed them), it did not solve. I put on the old ignition coil and all returned to some what normal. I returned the defective coil (which was Orielly's store brand) and got the upgraded BD coil. That worked fine.

The car actually is now running better than it ever has.. HOWEVER, it started throwing P0303 again ...

From reading, next steps or next thing to look at would be the injectors? I am not sure I'm capable of looking into that unless anyone has some pointers.

thanks in advance for any suggestions thrown my way...

Quote:
Originally Posted by NitroPT View Post
The 1st question to always a is how the DTC was retrieved.

I can tell you we get so many DIY's that come to the shop with problems they cant solve ..yet start telling us how to solve them..???
Mostly because of poor diagnostics's.!

BTW for all reading this, even numbered DTCs i.e. p0300, p0700, etc., are the worst to start thinking about what the issue is. They lead to anywhere,nowhere and everything.
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Old 05 Dec 2016, 01:55 pm
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Default Re: P0300 (intake leak?) after changing plugs, wires, coil

Throw a bottle of Berryman B-12 Chemtool in the tank.
You can get it at O'reilly's for about $5.
Put in the entire bottle at around 1/2 tank...no need to fill up.
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Old 05 Dec 2016, 01:57 pm
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Default Re: P0300 (intake leak?) after changing plugs, wires, coil

Quote:
Originally Posted by jhinze View Post
Thank you NitroPT and everyone else who replied on this thread, I do appreciate it.

Here is an update, and am looking for suggestions as to next steps...

I replaced the intake gaskets (they really needed them), it did not solve. I put on the old ignition coil and all returned to some what normal. I returned the defective coil (which was Orielly's store brand) and got the upgraded BD coil. That worked fine.

The car actually is now running better than it ever has.. HOWEVER, it started throwing P0303 again ...

From reading, next steps or next thing to look at would be the injectors? I am not sure I'm capable of looking into that unless anyone has some pointers.

thanks in advance for any suggestions thrown my way...
Wow! What did Orielly's say when you mentioned the new coil was defective?
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Old 05 Dec 2016, 02:04 pm
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Default Re: P0300 (intake leak?) after changing plugs, wires, coil

Quote:
Originally Posted by LionPT View Post
Throw a bottle of Berryman B-12 Chemtool in the tank.
You can get it at O'reilly's for about $5.
Put in the entire bottle at around 1/2 tank...no need to fill up.
Thanks sir, I'll give it a try tomorrow, I'm at a little more than 1/2 tank now
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