PT Cruiser Forum  
Advertisements
       

Go Back   PT Cruiser Forum > General Forums > General PT Cruiser Discussions

PT Cruiser Forum

Advertisements
Rough Idle with possible solutions. Thoughts?

 
Like Tree7Likes

Reply
 
LinkBack Thread Tools Display Modes
  #1 (permalink)  
Old 15 Mar 2018, 01:29 am
Vengence's Avatar
Cool Cruiser
 
Join Date: Mar 2009
Location: Buffalo, NY
Posts: 341
Default Rough Idle with possible solutions. Thoughts?

2008 PT LX Model. For some time now, it didnt bother me before but now it is but, It idles a bit rough. I have a few ideas/possible solutions to this but I want to get opinions before I start doing these ideas.

Idea Number 1- Cleaning out the Throttle Body and IAC. Mechanic says to just replace them if they are the cause but what could the harm be for just cleaning them out? Not spraying cleaner directly in there and just spraying on a rag and cleaning it out.

Idea number 2- Possibility that the Top and lower Mounts are not alligned. I had both replaced, 1 after I bought it which was fixed complimentary by the seller/dealer and the Top replaced about 6 months later. Where I believe the issues started. I never knew that alignment of motor mounts was possible until recently and explains a lot of what is happening.

In short on the mounts is this. Loosen the Top and Lower Mounts, Jack up the engine to rotate it a bit and align it properly. How to do this is fairly simple. In the picture I uploaded, You measure in Millimeters between the 2 red dots in the picture. So, with both Mounts loosened, the engine would sit between 122-124mm. You jack up the engine until the distance between those 2 red dots is 119mm and you tighten both mounts down again. So, you use the hole by the mount where the fuel line clip that holds the fuel line in place as one point and the middle of the bolt with the red dot as the other point. Once it is at 119mm, 90% of vibration issues are fixed. According to the video. This has worked for most but not others. Others mentioned it was Throttle Body and IAC, some the Center Mount which mine is okay, and some had misfires which mine is not doing.

What are your guys thoughts? Anything else I should look into as well?

Little Background- New Spark Plugs, New Wires, New Valves, New Timing Belt/Water pump, Engine and Head Gasket Resurfaced 1 year ago.

Attached Images
File Type: jpg Desktop Screenshot 2018.03.15 - 02.19.22.45.jpg (18.3 KB, 10 views)
__________________
2008 PT Cruiser LX Inferno Red

Last edited by Vengence; 15 Mar 2018 at 01:34 am.
Reply With Quote
  #2 (permalink)  
Old 15 Mar 2018, 04:09 am
Veteran Cruiser
 
Join Date: Sep 2009
Location: south of Tampa, Florida
Posts: 3,236
Default Re: Rough Idle with possible solutions. Thoughts?

Quote:
Originally Posted by Vengence View Post
2008 PT LX Model. For some time now, it didnt bother me before but now it is but, It idles a bit rough. I have a few ideas/possible solutions to this but I want to get opinions before I start doing these ideas.

Idea Number 1- Cleaning out the Throttle Body and IAC. Mechanic says to just replace them if they are the cause but what could the harm be for just cleaning them out? Not spraying cleaner directly in there and just spraying on a rag and cleaning it out.

Idea number 2- Possibility that the Top and lower Mounts are not alligned. I had both replaced, 1 after I bought it which was fixed complimentary by the seller/dealer and the Top replaced about 6 months later. Where I believe the issues started. I never knew that alignment of motor mounts was possible until recently and explains a lot of what is happening.

In short on the mounts is this. Loosen the Top and Lower Mounts, Jack up the engine to rotate it a bit and align it properly. How to do this is fairly simple. In the picture I uploaded, You measure in Millimeters between the 2 red dots in the picture. So, with both Mounts loosened, the engine would sit between 122-124mm. You jack up the engine until the distance between those 2 red dots is 119mm and you tighten both mounts down again. So, you use the hole by the mount where the fuel line clip that holds the fuel line in place as one point and the middle of the bolt with the red dot as the other point. Once it is at 119mm, 90% of vibration issues are fixed. According to the video. This has worked for most but not others. Others mentioned it was Throttle Body and IAC, some the Center Mount which mine is okay, and some had misfires which mine is not doing.

What are your guys thoughts? Anything else I should look into as well?

Little Background- New Spark Plugs, New Wires, New Valves, New Timing Belt/Water pump, Engine and Head Gasket Resurfaced 1 year ago.


Your pic above was a little hard to decipher. I tuned it up.



Jerry
rckstein likes this.
__________________
Reply With Quote
  #3 (permalink)  
Old 15 Mar 2018, 05:22 am
Vengence's Avatar
Cool Cruiser
 
Join Date: Mar 2009
Location: Buffalo, NY
Posts: 341
Default Re: Rough Idle with possible solutions. Thoughts?

Thanks. Not too good with picture editing and what not.
__________________
2008 PT Cruiser LX Inferno Red
Reply With Quote
  #4 (permalink)  
Old 15 Mar 2018, 10:27 am
rsrocket1's Avatar
Fanatic Cruiser
 
Join Date: Mar 2016
Location: Sacramento, CA
Posts: 700
Default Re: Rough Idle with possible solutions. Thoughts?

If the holes are not spaced at 119mm, definitely get the spacing done, it should take you about 20 minutes. The biggest hassle is removing the plastic splash guard, not the alignment

You might also check your PCV valve and the hose going to it. If the hose is split on the end or cracked or the PCV doesn't freely rattle when you remove it and shake it, replace it/them. It's super easy to get to and the parts are cheap.
Vengence likes this.
Reply With Quote
  #5 (permalink)  
Old 16 Mar 2018, 05:33 pm
Vengence's Avatar
Cool Cruiser
 
Join Date: Mar 2009
Location: Buffalo, NY
Posts: 341
Default Re: Rough Idle with possible solutions. Thoughts?

Update-

Throttle Body is clean.
IAC good.

Mount Allignment is ****ed. That will be dealt with in a couple weeks after I know for sure the Snow is gone and switch the tires and get an allignment. The mounts measurement wise is 124-125mm between the 2 spaces. So that will DEFINITELY have to be taken care of asap. I will look into the PCV Valve as well.
__________________
2008 PT Cruiser LX Inferno Red
Reply With Quote
  #6 (permalink)  
Old 16 Mar 2018, 06:24 pm
Obsessed Cruiser
 
Join Date: Aug 2014
Location: Thousand Oaks, CA
Posts: 7,156
Default Re: Rough Idle with possible solutions. Thoughts?

Quote:
Originally Posted by Vengence View Post
Update-

Throttle Body is clean.
IAC good.

Mount Allignment is ****ed. That will be dealt with in a couple weeks after I know for sure the Snow is gone and switch the tires and get an allignment. The mounts measurement wise is 124-125mm between the 2 spaces. So that will DEFINITELY have to be taken care of asap. I will look into the PCV Valve as well.
On my Pt Cruiser there was a plastic fitting for holding a hose that I was suppose to measure the the hole from so you really need to do your homework to make sure the measuring is done correctly and check to verify the location of the reference holes.
__________________
If at First You Don't Succeed - Try, Try Again
Reply With Quote
  #7 (permalink)  
Old 16 Mar 2018, 06:40 pm
rckstein's Avatar
Obsessed Cruiser
 
Join Date: Dec 2010
Location: Texas
Posts: 14,762
Default Re: Rough Idle with possible solutions. Thoughts?

Quote:
Originally Posted by ptcruisersteve View Post
On my Pt Cruiser there was a plastic fitting for holding a hose that I was suppose to measure the the hole from so you really need to do your homework to make sure the measuring is done correctly and check to verify the location of the reference holes.
Steve, did you read the OP's original post?

Quote:
Originally Posted by Vengence View Post
2008 PT LX Model. For some time now, it didnt bother me before but now it is but, It idles a bit rough. I have a few ideas/possible solutions to this but I want to get opinions before I start doing these ideas.

Idea Number 1- Cleaning out the Throttle Body and IAC. Mechanic says to just replace them if they are the cause but what could the harm be for just cleaning them out? Not spraying cleaner directly in there and just spraying on a rag and cleaning it out.

Idea number 2- Possibility that the Top and lower Mounts are not alligned. I had both replaced, 1 after I bought it which was fixed complimentary by the seller/dealer and the Top replaced about 6 months later. Where I believe the issues started. I never knew that alignment of motor mounts was possible until recently and explains a lot of what is happening.

In short on the mounts is this. Loosen the Top and Lower Mounts, Jack up the engine to rotate it a bit and align it properly. How to do this is fairly simple. In the picture I uploaded, You measure in Millimeters between the 2 red dots in the picture. So, with both Mounts loosened, the engine would sit between 122-124mm. You jack up the engine until the distance between those 2 red dots is 119mm and you tighten both mounts down again. So, you use the hole by the mount where the fuel line clip that holds the fuel line in place as one point and the middle of the bolt with the red dot as the other point. Once it is at 119mm, 90% of vibration issues are fixed. According to the video. This has worked for most but not others. Others mentioned it was Throttle Body and IAC, some the Center Mount which mine is okay, and some had misfires which mine is not doing.

What are your guys thoughts? Anything else I should look into as well?

Little Background- New Spark Plugs, New Wires, New Valves, New Timing Belt/Water pump, Engine and Head Gasket Resurfaced 1 year ago.

He has the correct measuring points, which can be seen in the photo enhanced by wwpptc.




But just in case, this is from the Chrysler Service Manual:

__________________

'06 Touring Edition NA Automatic
160k Miles / Electric Blue Pearl
USMC '82 - '93
Reply With Quote
  #8 (permalink)  
Old 16 Mar 2018, 06:43 pm
rckstein's Avatar
Obsessed Cruiser
 
Join Date: Dec 2010
Location: Texas
Posts: 14,762
Default Re: Rough Idle with possible solutions. Thoughts?

Quote:
Originally Posted by Vengence View Post
Update-

Throttle Body is clean.
IAC good.

Mount Allignment is ****ed. That will be dealt with in a couple weeks after I know for sure the Snow is gone and switch the tires and get an allignment. The mounts measurement wise is 124-125mm between the 2 spaces. So that will DEFINITELY have to be taken care of asap. I will look into the PCV Valve as well.
The 119mm measurement is while the jack is still supporting the engine. Once you remove the jack the measurement might change a little depending on how worn out the upper and lower torque struts may be.

I've sent you a PM with a link to download a copy of Chrysler Service Manual from my dropbox. Page 9-2105 starts the procedure about the upper and lower torque struts.
__________________

'06 Touring Edition NA Automatic
160k Miles / Electric Blue Pearl
USMC '82 - '93
Reply With Quote
  #9 (permalink)  
Old 16 Mar 2018, 07:47 pm
Obsessed Cruiser
 
Join Date: Aug 2014
Location: Thousand Oaks, CA
Posts: 7,156
Default Re: Rough Idle with possible solutions. Thoughts?

Quote:
Originally Posted by rckstein View Post
Steve, did you read the OP's original post?



He has the correct measuring points, which can be seen in the photo enhanced by wwpptc.




But just in case, this is from the Chrysler Service Manual:


I sure did and just letting other members know that sometimes there is a plastic holder in that hole and this has been posted in my own project replacing the upper and lower mounts.
__________________
If at First You Don't Succeed - Try, Try Again
Reply With Quote
  #10 (permalink)  
Old 16 Mar 2018, 09:41 pm
rckstein's Avatar
Obsessed Cruiser
 
Join Date: Dec 2010
Location: Texas
Posts: 14,762
Default Re: Rough Idle with possible solutions. Thoughts?

Quote:
Originally Posted by ptcruisersteve View Post
I sure did and just letting other members know that sometimes there is a plastic holder in that hole and this has been posted in my own project replacing the upper and lower mounts.
If your PT is missing this clip, you should look at replacing it as it does serve a purpose supporting the fuel line

__________________

'06 Touring Edition NA Automatic
160k Miles / Electric Blue Pearl
USMC '82 - '93
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Stalls at idle. Sometimes. And rough idle scatgo1 Tech & Performance Forum 6 27 Nov 2014 11:04 am
Rough Idle-Replacing the IAC Idle Air Controller engineerrock Tech & Performance Forum 9 07 Jun 2014 07:24 pm
'07 PT - Rough Idle, rough acceleration, and shuts off if it idles for too long La_Bruja Tech & Performance Forum 3 09 Aug 2013 07:50 am
Rough Idle, Rough @60, check engine light NEW Dystroy Tech & Performance Forum 8 12 Jan 2009 09:07 pm
Ran out of gas....got rough idle now! garpike Tech & Performance Forum 12 06 Aug 2008 04:21 pm


All times are GMT -5. The time now is 04:58 pm.




Powered by vBulletin® Version 3.8.2
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
LinkBacks Enabled by vBSEO 3.6.0 PL2 © 2011, Crawlability, Inc.
vB.Sponsors