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  #11 (permalink)  
Old 03 Mar 2019, 03:33 pm
_PTGT03's Avatar
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Default Re: rough idle

Quote:
Originally Posted by NitroPT View Post
The optimum spark plug gap is .042.

The spark plug gaps in most every case for most all engines is a generalized gap. Because there are to many variables that can effect the vast range of "best" gap a standard gap is normally listed.
On the PT Cruiser with a 1.6 or 2.4 Turbo, normally aspirated and SuperCharged after testing several using an oscilloscope with various engine wear factors a .042 was consistently shown to be the electrical and conductivity speaking the optimum gap for these engines.

But like always opinions vary and most on the source of where and how the information was gathered. The perfect example is how a manufacture after long time production and all engineering was completed decided to change the original gap recommendation? As for direct Spark Plug manufactures recombination they are almost never by testing their plugs in an actual engine.
NGK Spark Plugs Canada ┬╗ Tech Info ┬╗ Spark Plug FAQ
Q: Do I need to set the "gap" when installing a new set of plugs?
A: Maybe. A spark plug part number might fit hundreds of engines and, although the factory will typically set the gap to a pre-selected setting, this may not be the right gap for your particular engine. Insufficient spark plug gap can cause pre-ignition, detonation and even engine damage. Too much gap can result in a higher rate of misfires, loss of power, plug fouling and poor fuel economy. It is always best to check the gap against the manufacturer's specifications.

Another consideration that should be taken into account is the extent of any modifications that you may have made to the engine. As an example, when you raise compression or add forced induction (a turbo system, nitrous or supercharger kit) you must reduce the gap (about .004" for every 50 hp you add). However, when you add a high power ignition system (such as those offered by MSD, Crane, Nology) you can open the gap from .002-.005".
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  #12 (permalink)  
Old 03 Mar 2019, 04:14 pm
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Default Re: rough idle

Quote:
Originally Posted by rckstein View Post
That recommended plug gap may have changed

This is what the decal on the upper radiator support says:



Last year when I had contacted Chrysler Customer Assistance about it, this was their reply:

"Thank you for contacting the FCA Customer Assistance Center. I can
certainly understand the importance of having the correct information
for the gap of the spark plugs on your 2006 PT Cruiser.

I was able to gather the following information:

The recommend gap for plugs with your vehicle (equipped with a 2.4L
Non-Turbo Engine) is 0.048 to 0.053 in, this is with Champion« Nickel
spark plugs - part number 05149002AA.

Thank you again for your email Rick, I hope this information will be of
assistance to you. Should you require additional assistance, or have
any new information to provide, please reply to this email message or
call 1-800-247-9753.

Sincerely,

Alex"

An interesting reply. The Champion Nickel spark plug number comes back as a RE16MC! 'Copper Plus' is defined as a copper/nickel electrode and tip. Until I see an updated TSB to verify the assistant's claim, I'm going with the factory decal and TSB 08-008-04.

I've had 2 cars with the 2.4 non-turbo engine. One had the .050 gap, the other had a .040 gap. They both ran great. At 35,000 miles, the gap that started at .050 grew to .060+. Scary looking.
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  #13 (permalink)  
Old 03 Mar 2019, 04:47 pm
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Default Re: rough idle

Quote:
Originally Posted by pt06 View Post
An interesting reply. The Champion Nickel spark plug number comes back as a RE16MC! 'Copper Plus' is defined as a copper/nickel electrode and tip. Until I see an updated TSB to verify the assistant's claim, I'm going with the factory decal and TSB 08-008-04.

I've had 2 cars with the 2.4 non-turbo engine. One had the .050 gap, the other had a .040 gap. They both ran great. At 35,000 miles, the gap that started at .050 grew to .060+. Scary looking.
This is sure to start a debate, but see this older thread on the matter and the TSB that you refer to is only for '03-'04 years, not all others:

http://www.ptcruiserlinks.com/forum/...info-help.html
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  #14 (permalink)  
Old 04 Mar 2019, 04:02 pm
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Default Re: rough idle

The p0301 code is caused by cylinder number 1 misfire.so it would be a good idea to remove the spark plug and take a look at it and check that the gap is right and the plug is not cracked or damaged. Also take a look at the spark plug wire boots to see if there's any signs of arcing. If you installed the wires without dielectric grease that may be happening. Also was it misfiring when you change the plugs and wires last time. As was suggested before, you should do a compression test on that cylinder if you don't find anything else.

With the car running at idle you can disconnect the spark plug wire at the coil and hold it about a quarter of an inch away from the terminal and watch if the spark is nice and blue and consistently sparking. If you have good spark and compression maybe fuel injector problem.
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Old 04 Mar 2019, 04:18 pm
Fk5 Fk5 is offline
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Default Re: rough idle

As stated, cylinder 1 misfire. The flashing CEL is probably warning that too much unburned fuel is passing through the engine which will damage the cat.

First easy steps:
  • Change plug on cylinder 1
  • swap wires cylinder 4 and cylinder 1.
Did the code follow (become P304)?
Cylinder 1 is the far passenger side. You can do this without puling the upper plenum.
Next:
  • swap injectors from #1 and another cylinder. While you are in there replace the o-rings.
You have to pull the plenum for this, so swap out the intake gasket and do a compression test. You also might want to do the lower intake gasket. On mine, the lower gasket pushed in and blocked the injector port. No vacuum leak, no way to find it without pulling the manifold, but P304. That is apparently common on the aluminum turbo intake that I have.
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  #16 (permalink)  
Old 04 Mar 2019, 07:49 pm
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Default Re: rough idle

markeele,
I may be off base here but you'd obviously see this when changing the spark plugs. Before doing that, pull the #1 spark plug connector off and inspect the spark plug tube. Sometimes they may get filled with oil from either a failing tube gasket or simply by spilling oil from the oil filler port.

If you see a bunch of liquid oil in the tube, use something to wick out as much as possible. If it's just spilled oil, you may be OK. If it returns, then you may need to take off the valve cover and replace the spark plug tube seals as well as the valve cover gasket.
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  #17 (permalink)  
Old 06 Mar 2019, 06:50 am
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Default Re: rough idle

Rick, I reread the TSB and it stated 'and all prior years of of the ED1 and EDZ engines'. The EDZ engines were listed starting in 1995. I couldn't find any info on the ED1 engines.
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  #18 (permalink)  
Old 06 Mar 2019, 07:12 am
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Default Re: rough idle

Quote:
Originally Posted by pt06 View Post
Rick, I reread the TSB and it stated 'and all prior years of of the ED1 and EDZ engines'. The EDZ engines were listed starting in 1995. I couldn't find any info on the ED1 engines.
Yeah, I commented about that in the other thread where spark plug gap was being discussed.

And as I said in the other thread, rather than putting a statement at the end of the TSB, one would think that when they issued the TSB, (2004) that they would have included ALL model years of the PT Cruiser which were affected, which at the time the TSB was issued would have been 2001-2004.

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  #19 (permalink)  
Old 06 Mar 2019, 08:18 am
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Default Re: rough idle

Rick, yeah, it's all in the fine print. I learned that the penalty for 'early withdrawal' [fill in your own joke here ..............] on a bank CD is now at 3% in some banks. Which means: if you deposited $10.000 in a CD and your car died and you needed the money back to buy another car, they would give you a total of $9700 back.
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  #20 (permalink)  
Old 14 Feb 2020, 06:53 pm
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Default Re: rough idle

Ended up being a sticky exhaust valve rebuilt the head and all is good
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