PT Cruiser Forum  
Advertisements
       

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

PT Cruiser Forum

Advertisements
2003 PT Cruiser GT -- running rough/backfiring

 
Like Tree2Likes

Reply
 
LinkBack Thread Tools Display Modes
  #1 (permalink)  
Old 23 Nov 2014, 02:54 pm
VermontBob's Avatar
Fresh Cruiser
 
Join Date: Mar 2014
Location: Vermont
Posts: 18
Send a message via AIM to VermontBob
Default 2003 PT Cruiser GT -- running rough/backfiring

Hello,

I'm fairly new to this forum, but have been using it as a guide when I type my problem into google for answers, as this site is the first one to pop up with suggestions. I've gone one more step above however, & recorded a video to better describe my troubles with this car.

I've replaced:
all plugs & wires with new. (Mopar wires & champion plugs)
intake gasket (upper)
valve cover gaskets & sparkplug seals
coil got checked out & is good.
Seafoam'd the throttle body & polished it clean with an old toothbrush

It still runs rough, to the point the MIL flashes on the dash with a 304 misfire code. I'm very frustrated with all this because I've done the full "spray starter fluid on the gaskets, (nothing changes)

The only thing different this morning (shortly before the video was taken) was that the chattering sound from the intake was gone, & there was this high pitched whistling sound instead. Never heard it before, & couldn't locate exactly its location. I idled the car for about 5 minutes, then turned it off. After about 15 minutes, I started the car back up & the whistle was gone, but it still ran just as bad as it did when it was whistling.

I should mention that I've had some trouble with high idling on any trip that requires me to reach 50mph+. Coming down to a stop, it doesn't want to, & it idles about 40mph +/- when cold.

<iframe width="420" height="315" src="//www.youtube.com/embed/d0PyjOjuajs" frameborder="0" allowfullscreen></iframe>

Any help at this point would be most appreciated

**EDIT: for some reason the video link didn't post:


Thanks,
VermontBob

Last edited by VermontBob; 23 Nov 2014 at 02:55 pm. Reason: video link didn't embed
Reply With Quote
  #2 (permalink)  
Old 23 Nov 2014, 06:52 pm
quicksilverdon's Avatar
Obsessed Cruiser
 
Join Date: Nov 2003
Location: Felton, Delaware
Posts: 20,501
Default Re: 2003 PT Cruiser GT -- running rough/backfiring

Problem come on all of a sudden, or gradually?
Has timing belt been replaced?
A possibility is timing belt may have jumped a tooth or two...
__________________
"Anti-intellectualism has been a constant thread winding its way through our political and cultural life,
nurtured by the false notion that democracy means that 'my ignorance is just as good as your knowledge."
Isaac Asimov"

'05 Limited Turbo Lite, (Silver, of course)4-wheel ABS, Sunroof, Spoiler. Mods: E&G Classic grill, K&N FIPK, BTG duals, rear lowered 1.5", LED washer lights, $20 catch can, Aoogah horn, Weatherflectors, Sunroof Deflector, Fuzzy Dice, rear logo flames, rear pinstripe graphic, Gen3 Taillights, rear sway bar, hood struts, Strut bar.
Traded in '02 Silver Touring Edition w/87,000 miles
Reply With Quote
  #3 (permalink)  
Old 23 Nov 2014, 06:59 pm
jennandjudd's Avatar
Fresh Cruiser
 
Join Date: Apr 2014
Location: Boise Idaho
Posts: 31
Default Re: 2003 PT Cruiser GT -- running rough/backfiring

make sure that your plug wires have spacers , sometimes they can arch on each other if there touching , I had this problem with mine
__________________
Reply With Quote
  #4 (permalink)  
Old 23 Nov 2014, 07:06 pm
Obsessed Cruiser
 
Join Date: Aug 2014
Location: Thousand Oaks, CA
Posts: 7,321
Default Re: 2003 PT Cruiser GT -- running rough/backfiring

When you replaced spark plugs did you do a compression check?
Reply With Quote
  #5 (permalink)  
Old 24 Nov 2014, 01:23 am
VermontBob's Avatar
Fresh Cruiser
 
Join Date: Mar 2014
Location: Vermont
Posts: 18
Send a message via AIM to VermontBob
Default Re: 2003 PT Cruiser GT -- running rough/backfiring

Compression test hasn't been done yet, only because they (the local garages that have the fancy equipment to do this testing along with a boroscope) want boat loads of money to do the test. I have noticed that 3 of the fuel injectors have been replaced, while #4 on cyl #4 is really old looking, covered in soot. When I pull the plug, it's bone dry. I swapped plugs 1 & 4 & have the same misfire. I tried swapping wires, no change. This coming Saturday I plan to install a new injector into #4 & see if that does anything. A few Chrysler techs said to go for it & see, & while I'm in there, change out the lower intake gasket. They also said to spray this sticky gasket spray on both sides of the upper & lower gasket sides before reinstalling them.

I'll also try to get my camera in there to take some photos. Injectors 1 to 3 are aftermarket 'pink' & are running just fine. Injector #4 is old, rusty, sooty & appears not to be straight/aligned like the rest of them. I was told that before I take it (it being the fuel rail) apart, I'm supposed to pull the fuel pump relay, start the car & let it run until it stalls out. This will relieve the fuel rail pressure.

I'm an intermediate mechanic, not an expert by any means, so rebuilding is not as hard, but with that being said, this is also my very first ever turbo I've ever owned. I'm afraid that somehow I'm going to mess this all up :P

I got my fingers crossed that this works. Snow's coming & I REALLY don't want to have to take any parts off my show PT (A Harley Quinn Edition) 2001 PT 5spd.
Reply With Quote
  #6 (permalink)  
Old 24 Nov 2014, 10:26 am
quicksilverdon's Avatar
Obsessed Cruiser
 
Join Date: Nov 2003
Location: Felton, Delaware
Posts: 20,501
Default Re: 2003 PT Cruiser GT -- running rough/backfiring

Based on the clues, the injector seems worth a try.
You just bought the car and don't know the history?
__________________
"Anti-intellectualism has been a constant thread winding its way through our political and cultural life,
nurtured by the false notion that democracy means that 'my ignorance is just as good as your knowledge."
Isaac Asimov"

'05 Limited Turbo Lite, (Silver, of course)4-wheel ABS, Sunroof, Spoiler. Mods: E&G Classic grill, K&N FIPK, BTG duals, rear lowered 1.5", LED washer lights, $20 catch can, Aoogah horn, Weatherflectors, Sunroof Deflector, Fuzzy Dice, rear logo flames, rear pinstripe graphic, Gen3 Taillights, rear sway bar, hood struts, Strut bar.
Traded in '02 Silver Touring Edition w/87,000 miles
Reply With Quote
  #7 (permalink)  
Old 24 Nov 2014, 10:37 am
jennandjudd's Avatar
Fresh Cruiser
 
Join Date: Apr 2014
Location: Boise Idaho
Posts: 31
Default Re: 2003 PT Cruiser GT -- running rough/backfiring

Yes I was going to say from the video theres a definite miss at idle , im almost guaranteed with the plug being dry thats your problem.
__________________
Reply With Quote
  #8 (permalink)  
Old 30 Nov 2014, 12:24 pm
VermontBob's Avatar
Fresh Cruiser
 
Join Date: Mar 2014
Location: Vermont
Posts: 18
Send a message via AIM to VermontBob
Default Re: 2003 PT Cruiser GT -- running rough/backfiring

ok, here's the lit of new stuff:

New coil pack.
New Champion plugs.
New Mopar wires.
New upper AND lower intake gaskets (applied with the red sticky gasket spray)
New Valve cover gasket & tube seals.

(While I was in there I also painted the valve cover & the intake)

Intake (lower) gasket was pretty much non-existing, after I pulled it off. It had a lot of crud & seepage caked on it. I scraped that all off & ''deep-creep'd" (Seafoam) it with a toothbrush. Then I wiped all surfaces clean. Sprayed the gasket & the block. Also sprayed the intake lower end. I did the same for the upper intake manifold parts as well.

A note to mention is that the dipstick tube for the oil is truely a nightmare to get out. It's a 10mm shorty bolt but installed in a manner that almost requires you to slice your hand when removing it.

Putting the lower intake back in requires some practice because the bracket that hold the front in place will fight you, causing the sticky gasket to fall out of place. It took several ties to get it in place correctly. Also worth mentioning, Do not attempt to do any of this with out a nifty socket called a "Universal Joint" These things made the job possible.

I did end up replacing the #4 injector, but I went one step further: I pulled out ALL of the injectors, & replaced all the O-Rings, just because I was already in there & I sure don't want to have to do this AGAIN.

So I put it all back together, & crossed my fingers:....It runs like a new car now. Not one skip, pop or backfire. So I took it for a drive & learned a very important lesson:

2001 PT Limited 15'' wheels (the steelies) do NOT fit the 2003 GT wheel. Kept hearing this scraping rotation noise, like rust on a rotor. The car seems to have all its power back n stuff, so this is a major YAY!. However, I will be jacking up both cars (again) & putting the snow tires back on the GT, so I can put the 2001 HQ PT (back) into storage.

I'd post pictures here, but I don't quite know how to do that yet.

Thanks for all the advice,
Vermont Bob
Reply With Quote
  #9 (permalink)  
Old 30 Nov 2014, 01:55 pm
quicksilverdon's Avatar
Obsessed Cruiser
 
Join Date: Nov 2003
Location: Felton, Delaware
Posts: 20,501
Default Re: 2003 PT Cruiser GT -- running rough/backfiring

Glad you nailed it - most likely the # 4 injector???

Surprised at steelies - others have used them on GTs with no issue.
__________________
"Anti-intellectualism has been a constant thread winding its way through our political and cultural life,
nurtured by the false notion that democracy means that 'my ignorance is just as good as your knowledge."
Isaac Asimov"

'05 Limited Turbo Lite, (Silver, of course)4-wheel ABS, Sunroof, Spoiler. Mods: E&G Classic grill, K&N FIPK, BTG duals, rear lowered 1.5", LED washer lights, $20 catch can, Aoogah horn, Weatherflectors, Sunroof Deflector, Fuzzy Dice, rear logo flames, rear pinstripe graphic, Gen3 Taillights, rear sway bar, hood struts, Strut bar.
Traded in '02 Silver Touring Edition w/87,000 miles
Reply With Quote
  #10 (permalink)  
Old 30 Nov 2014, 09:31 pm
VermontBob's Avatar
Fresh Cruiser
 
Join Date: Mar 2014
Location: Vermont
Posts: 18
Send a message via AIM to VermontBob
Default Re: 2003 PT Cruiser GT -- running rough/backfiring

I think it was the missing lower intake combined with the injector. Drove about 20 miles today, & lo & behold, the blasted check light light came back on reading P0440. I'm thinking it's because I let air into the fuel rail system when I pulled the rail off. Instead of turning the key on, & bleeding the air off when I had it all put back together, I simply cranked the car until it caught & ran.

If not, I haven't a clue what it could be, altho, I might buy a new gas cap for it, just in case because the rubber's a bit dry & cracked in the cap lid.

VermontBob
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
My 2004 PT Cruiser is running rough. chuck10101 Tech & Performance Forum 7 22 May 2014 01:40 pm
05 Cruiser running rough after timing belt replacement DonSkinnerNoble Welcome New PT Cruiser Members 9 27 Jul 2012 09:19 pm
2003 PT misfiring, running rough, no power codes checked dasher80 Tech & Performance Forum 4 04 Nov 2011 03:12 pm
2003 PT Cruiser running power oscar514 Tech & Performance Forum 1 28 Feb 2009 05:13 pm
Rough idling, backfiring, hesistation DJR General Turbo Discussions 19 08 Feb 2006 10:05 pm


All times are GMT -5. The time now is 07:57 pm.




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