PT Cruiser Forum  
Advertisements
       

Go Back   PT Cruiser Forum > General Forums > Tech & Performance Forum

PT Cruiser Forum

Advertisements
Missfires

 
Like Tree4Likes

Reply
 
LinkBack Thread Tools Display Modes
  #1 (permalink)  
Old 27 Apr 2017, 07:21 am
Fresh Cruiser
 
Join Date: Aug 2012
Posts: 37
Default Missfires

Im working on my sister-in-laws 2004 pt with 130k miles.
It is misfiring randomly every few minutes at idle and seems to continue after acceleration from a stop sometimes. When its not puttering it is ideling smooth. I just replaced the radiator 2 weeks ago because of it stalling an misfiring with the AC on. Thats better now, while it hasnt stalled yet its very close. I got a misfire and camshaft sensor code but it hasnt thrown any since yesterday when i replace the camshaft sensor. I know the spark plug wires are first suspect on this car, but i replaced them last year(jan 2016) with bosch 09477 wireset, as well as plugs champion RE14PLP5 (7440). Intake manifold was also replaced then. This was all part of a timing belt job last year at 105k.
I took apart the intake manifold and cleaned the the usual suspects on it. Nothing obvious in the coolant or oil, but havnt done a change lately. There was an unusual amount of oil in 2 of the spark plug chambers last night when i was cleaning after the camshaft sensor didnt resolve the issue. I pulled the plugs and removed that oil, plugs looked ok.

Im leaning toward coil pack, then wires. Or maybe fuel filter? Water in the gas? Im at a loss but im really hoping its not a headgasket or valve issue.

What should my next step be?
Reply With Quote
  #2 (permalink)  
Old 27 Apr 2017, 07:31 am
Veteran Cruiser
 
Join Date: Aug 2015
Location: Lake Wales, FL
Posts: 4,714
Default Re: Missfires

Maybe try cleaning the throttle body and put a bottle of Techron fuel injector cleaner in the tank. But what about the plugs? You state that you replaced them last year, but have you pulled one to see what it looks like? Plugs can tell you a LOT about what's going on with an engine.
__________________


Aspire to inspire before you expire.
Reply With Quote
  #3 (permalink)  
Old 27 Apr 2017, 07:57 am
Fresh Cruiser
 
Join Date: Aug 2012
Posts: 37
Default Re: Missfires

I ran fuel injector cleaner in it less than a month ago. I did clean the throttle body and could do some more i guess, but honestly it seems to be working fine. When it sputters at idle with the air filter off you hear a huge inrush sucking noise of air being sucked in briefly when it starts to misfire... this is probably not helpful info though.

The plugs looked ok, if not a bit on the white side.

Last edited by thecompguru; 27 Apr 2017 at 10:04 am.
Reply With Quote
  #4 (permalink)  
Old 27 Apr 2017, 11:45 am
Senior Cruiser
 
Join Date: Jan 2014
Location: SW PA
Posts: 1,336
Default Re: Missfires

Did you clean the camshaft magnet, make sure its not cracked. Don't over tighten if you take it off, it has locating pins.
Intake gaskets could be causing miss fires, only way to check is remove it.
__________________
Addicted to Mopar You can tell how old I am..
65 Dodge Coronet 6 cyl 2dr Post
66 Ply Satellite with 273 engine swap to 69 340 4spd
70 340 4spd Dart Swinger "Those were the days my friend"
73 Charger SE
Had a few Vetts on the way 69, 85
Several Neons some flips
01 Sebring flip
Cruiser's 01, 220K Gone to a new home
Cruiser 03 133K Gone to a new home
Cruiser 06 110K Project Gone to new Home
Cruiser 05 Ltd 120,809 bought with broken belt Oct2015
May 16 Resurrected to once again roam the streets.

20 Miles South Of Pittsburgh
Reply With Quote
  #5 (permalink)  
Old 27 Apr 2017, 01:09 pm
Fresh Cruiser
 
Join Date: Aug 2012
Posts: 37
Default Re: Missfires

Currently working on it now. Going to install new valve cover gasket. But ohm'ed the spark plug wires and 2 seem bad. There's also a crack in the bottom of the resin for the coil pack so im about to test it.
Reply With Quote
  #6 (permalink)  
Old 27 Apr 2017, 01:44 pm
Fresh Cruiser
 
Join Date: Aug 2012
Posts: 37
Default Re: Missfires

Coil tested out fine as everyone on here says, they dont fail unless its obviously busted. 2 of the wires have high resistance (several k Ohm)however and these were lifetime warranty off amazon but not sure how to redeem that since they are currently unavailable now. Suggestions on new wires?
Reply With Quote
  #7 (permalink)  
Old 27 Apr 2017, 03:12 pm
Handy_Cruiser's Avatar
Obsessed Cruiser
 
Join Date: Oct 2013
Location: Arkansas
Posts: 10,271
Default Re: Missfires

Quote:
Originally Posted by thecompguru View Post
Coil tested out fine as everyone on here says, they dont fail unless its obviously busted. 2 of the wires have high resistance (several k Ohm)however and these were lifetime warranty off amazon but not sure how to redeem that since they are currently unavailable now. Suggestions on new wires?
MSD 32689 8.5mm super conductor spark plug wire set. These are heavy and well made. May be overkill on an everyday driver. But it's a case where you can have a very good high quality product for not too much more than an average quality product.

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
NitroPT likes this.
__________________
Reply With Quote
  #8 (permalink)  
Old 27 Apr 2017, 03:38 pm
NitroPT's Avatar
Obsessed Cruiser
 
Join Date: Jun 2012
Location: USA kalyfornia
Posts: 15,662
Default Re: Missfires

Quote:
Originally Posted by thecompguru View Post
Coil tested out fine as everyone on here says, they dont fail unless its obviously busted. 2 of the wires have high resistance (several k Ohm)however and these were lifetime warranty off amazon but not sure how to redeem that since they are currently unavailable now. Suggestions on new wires?
This is not exactly accurate. Everyone in this case on forums does not get an election won. The only way to health test a coil is by using an oscilloscope while operating on the engine. The DIY test is a simple fail run test and not a complete that you must do under a load and different engine speeds.

So what I am basically suggestion is dont necessarily rule out replacing the coil pack!
JDK52 likes this.
__________________
To view larger pictures simply "click " on the picture!

Dalai Lama
"Share you knowledge. It's the best way to achieve immortality."
ASE MASTER TECHNICIAN
Reply With Quote
  #9 (permalink)  
Old 27 Apr 2017, 03:58 pm
Fk5 Fk5 is offline
Senior Cruiser
 
Join Date: Jul 2011
Location: Colesville, MD
Posts: 1,828
Default Re: Missfires

Quote:
Originally Posted by Handy_Cruiser View Post
MSD 32689 8.5mm super conductor spark plug wire set. These are heavy and well made. May be overkill on an everyday driver. But it's a case where you can have a very good high quality product for not too much more than an average quality product.

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
$14.50 a wire?!?! Yikes!

They aren't even custom length. OEM wires are different lengths for cylinders 1&4 (longer) and 2&3 (shorter). I've paid that much for wires, but there were 9 of them!
__________________
2003 GT 5 speed
162,000 miles
Reply With Quote
  #10 (permalink)  
Old 27 Apr 2017, 04:06 pm
rckstein's Avatar
Banned
 
Join Date: Dec 2010
Location: Texas
Posts: 15,518
Default Re: Missfires

Quote:
Originally Posted by Fk5 View Post
$14.50 a wire?!?! Yikes!

They aren't even custom length. OEM wires are different lengths for cylinders 1&4 (longer) and 2&3 (shorter). I've paid that much for wires, but there were 9 of them!
The OEM set on my PT are all the same length.
NitroPT likes this.
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



All times are GMT -5. The time now is 10:48 am.




Powered by vBulletin® Version 3.8.2
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
LinkBacks Enabled by vBSEO 3.6.0 PL2 © 2011, Crawlability, Inc.
vB.Sponsors