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Old 02 Mar 2019, 11:26 pm
markeele's Avatar
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Default rough idle

2007 pt cruiser non turbo automatic. Out of the blue it started to idle rough and the check engine will flash, but as soon as i get to around 1500 rpm it smooths out and the light stops flashing the engine light stays on but doesnt flash. Did the key dance procedure and no codes. Anyone experience this, if so what was the cause? Sorry if already asked and answered but couldnt find my problem in previous post. Thanks
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Old 02 Mar 2019, 11:55 pm
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Default Re: rough idle

If the check light was flashing a code will be set in the PCM. Flashing check engine light is usually due to a misfiring cylinder and a code will be set. Get a code reader or go to an AutoZone store and get them to tread the codes for you. It's impossible to tell what's wrong without getting bthe code's.
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Old 03 Mar 2019, 02:12 am
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Default Re: rough idle

I would start by replacing the spark plugs as shown on the underhood decal. - Champion RE16MC gapped at .040 inch. Then replace the spark plug wires with factory wires. Change the PCV valve [also factory]. Check the valve's hose for cracks and tightness. Clean and oil the small filter at the bottom of the air filter box. Inspect or change the O'ring gaskets that are located between the intake manifold halves. And go from there.
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Old 03 Mar 2019, 04:37 am
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Default Re: rough idle

As you change the spark plugs I would also do a compression check while you have the upper manifold already removed.
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Old 03 Mar 2019, 07:08 am
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Default Re: rough idle

Quote:
Originally Posted by pt06 View Post
I would start by replacing the spark plugs as shown on the underhood decal. - Champion RE16MC gapped at .040 inch. Then replace the spark plug wires with factory wires. Change the PCV valve [also factory]. Check the valve's hose for cracks and tightness. Clean and oil the small filter at the bottom of the air filter box. Inspect or change the O'ring gaskets that are located between the intake manifold halves. And go from there.
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"
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Old 03 Mar 2019, 10:58 am
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Default Re: rough idle

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Last edited by Nitro1; 03 Mar 2019 at 11:02 am.
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Old 03 Mar 2019, 11:01 am
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Default Re: rough idle

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Old 03 Mar 2019, 11:12 am
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Default Re: rough idle

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.
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Old 03 Mar 2019, 11:57 am
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Default Re: rough idle

Error code p301. Plug are a couple months old, gapped at .045 didnt change wires. I started it up in the garage last night with no light at all pitch dark, raised the hood didnt see any sparks from wires, sprayed around entire engine with carb cleaner couldnt find a vacuum leak. It runs great at speed but rough at idle. Check engine flashes until i get up around 1500 rpms then goes of flash and stays on steady
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Old 03 Mar 2019, 03:25 pm
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Default Re: rough idle

Quote:
Originally Posted by markeele View Post
Error code p301. Plug are a couple months old, gapped at .045 didnt change wires. I started it up in the garage last night with no light at all pitch dark, raised the hood didnt see any sparks from wires, sprayed around entire engine with carb cleaner couldnt find a vacuum leak. It runs great at speed but rough at idle. Check engine flashes until i get up around 1500 rpms then goes of flash and stays on steady
Typically engine misfires should be consistent at all loads. Misfires at different speeds but stops misfiring at another speed can be an engine controls issue (sensors) or a faulty injector.

I suggest you get the alldatadiy for your car and follow the troubleshooting steps for the P301 code. It's a big job, diagnosing and correcting misfires often takes a long time, can be a complex procedure, if it's not an obvious fault.
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Last edited by _PTGT03; 03 Mar 2019 at 03:27 pm.
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