Idles rough

Tiny
BIGWILL9121
  • MEMBER
  • 2006 CHRYSLER PT CRUISER
  • 200,000 MILES
Ok here it is. When my car idles it idles rough. Ive had it hooked op to a computer but it only showed that my cooling fan was out, which I already knew. It has been over heated once or twice. But when I put new plugs in it it straightens out. It does have close to or over 200,000 miles. What is the most likely problem im having and what do I need to fix this?
Wednesday, June 19th, 2013 AT 2:16 AM

33 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Hello

This guide will help

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

Please run down this guide and report back.
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Wednesday, June 19th, 2013 AT 5:59 AM
Tiny
BIGWILL9121
  • MEMBER
  • 4 POSTS
I ment to add in the question that when I pulled the plugs, the plugs in cylenders 1 and 2 where covered in oil. This being said I dont think its the fuel pressure.
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Thursday, June 20th, 2013 AT 12:54 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
If the plugs are covered in oil then you have a more serious problem thatn a fuel pressure regulator. Check compression on allcylinders
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Thursday, June 20th, 2013 AT 5:28 AM
Tiny
BIGWILL9121
  • MEMBER
  • 4 POSTS
U thinkin that my rings r out or goin out?
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Thursday, June 20th, 2013 AT 5:51 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Cold be valve seals too but check compression
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Friday, June 21st, 2013 AT 6:49 AM
Tiny
BIGWILL9121
  • MEMBER
  • 4 POSTS
If I check the compression and its good then its the valve seals, and if not its the rings. Is that what ur sayin?
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Saturday, July 6th, 2013 AT 11:32 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Unless you change the plugs your roughness at idle or anywhere wont go away. Check your compression dry on all 4 then wet by spraying oil in cylinders send me the readings.
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Sunday, July 7th, 2013 AT 5:34 AM
Tiny
US7492
  • MEMBER
  • 3 POSTS
  • 2006 CHRYSLER PT CRUISER
2006 Chrysler PT Cruiser 4 cyl Front Wheel Drive 76854 miles

my call will sometimes stall or idle rough does it with and without ac on but worse with it on sometimes all dash lights will flash and odemeters bounce when this happens any suggestions as to what might be the problem?
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-1
Friday, January 10th, 2020 AT 1:48 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Engine running rough or misfiring can be cause by the following:

1. Defective spark plug
2. Inadequate spark/coil, defective spark plug wire.
3. Lack of compression
4. False air leakage.
5. Faulty fuel injectors.
6. Insufficient fuel pressure.
7. Contaminated fuel.
8. EGR valve that is leaking.
9. Oxygen sensors.
10. Throttle position sensor.
11. Idle air control valve.
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Friday, January 10th, 2020 AT 1:48 PM (Merged)
Tiny
FATMAN
  • MEMBER
  • 3 POSTS
  • 2005 CHRYSLER PT CRUISER
  • 150,000 MILES
Had timing belt replaced as well as cam positioning sensor but I am still getting same error codes, any suggestions? Idles rough, acceleration suffers at 3500 rpm, mpg has also gone down
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Friday, January 10th, 2020 AT 1:48 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,119 POSTS
Check wiring. To the cam sensor for corrosion, check catalytic converter for plugging, make sure timing is correct
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Friday, January 10th, 2020 AT 1:48 PM (Merged)
Tiny
FATMAN
  • MEMBER
  • 3 POSTS
Thanks there is a good possibility that the cat is bad now that u mention it. Where can I find the cam sensor at?
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Friday, January 10th, 2020 AT 1:48 PM (Merged)
Tiny
PHILPMDA21
  • MEMBER
  • 1 POST
  • 2004 CHRYSLER PT CRUISER
  • 4 CYL
2004 pt cruiser starts idling rough when I turn on a/c
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Friday, January 10th, 2020 AT 1:48 PM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Turning the A/C on simply adds more load to an engine that likely had a problem already. It could be many things like a vacuum leak, ignition problem, fuel problem or more serious internal problem.
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Friday, January 10th, 2020 AT 1:48 PM (Merged)
Tiny
JBUCKNER5
  • MEMBER
  • 3 POSTS
  • 2003 CHRYSLER PT CRUISER
  • 95,200 MILES
I'm stumped. I have replaced the plugs 3 times, the coil and wires twice, checked the wiring for proper continuity, and replaced the PCM with a reman. Every time I reset the DTC codes, the vehicle will run fine until about 2000 rpm then start missing and through P2305 first, followed by P0300 then P0352. Plugs 1 and 4 look clean and plugs 2 and 3 look dirty. I have cleaned the MAP and the IAT. Both coils show 0.45 ohms primary and 11k ohms secondary.

I have checked the Crank and cam position sensors and and associated all wiring. I cannot think of anything else the problem could be other than the new PCM. Any suggestions?
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Friday, January 10th, 2020 AT 1:48 PM (Merged)
Tiny
CARADIODOC
  • MECHANIC
  • 34,186 POSTS
You gotta have fuel too. Try switching two injectors to see if the misfire goes to a different cylinder.
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Friday, January 10th, 2020 AT 1:48 PM (Merged)
Tiny
JBUCKNER5
  • MEMBER
  • 3 POSTS
I'll give it a try this weekend. That's the only thing I didn't look at.
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Friday, January 10th, 2020 AT 1:49 PM (Merged)
Tiny
JBUCKNER5
  • MEMBER
  • 3 POSTS
Took the car to the dealer. Found out the PCM had to be flashed a second time. They also did an update. There is a service bulletin on the new recommended spark plus. Champion Copper Plus. The PCM was manufactured by Auto Computer Exchange. After a call to their support about the issue, several hang ups and dead end transfers, and the asinine response from their support, I will never use them again and will recommend to everyone I know to find a different company. From my experience, they do a half-assed job on the PCM's and do not want to support their work.
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Friday, January 10th, 2020 AT 1:49 PM (Merged)
Tiny
LANCE SHOCKLEY
  • MEMBER
  • 3 POSTS
  • 2003 CHRYSLER PT CRUISER
  • 2.4L
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 121,000 MILES
Our PT Cruiser is running rough after you drive it about 5 miles. This started after I changed the plugs, wires, and coil yesterday. I have since changed the intake gaskets and MAP sensor and still no luck. I am getting codes P0352, P0351, P0300, P0171.
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Friday, January 10th, 2020 AT 1:49 PM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
You are getting codes for coil primary circuits so something went wrong with the coil change. Check you work, especially the coil connectors.
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Friday, January 10th, 2020 AT 1:49 PM (Merged)

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