Happy times flexplate - Jeep Cherokee Forum
Jeep Cherokee Forum


OEM Cherokee Technical. All factory issues and info go here!
XJ (84-01)
All OEM related XJ Tech. Examples, no start, general maintenance or anything that's stock.
Sponsored by:
Sponsored by:

Happy times flexplate

Reply
 
 
 
Thread Tools Search this Thread
Old 01-07-2012, 08:10 PM   #1
Junior Member
Thread Starter
 
Join Date: May 2011
Posts: 35

View Calhoon's Photo Album My Photos
Default Happy times flexplate

So I've spent all day at the shop swapping in a new flex plate. We finished everything up start it up check all the gears, start backing up and the timing was off. It wont reach over 10mph but when I get it over 1000rpm it will miss fire and feels like it's ran out of gas. I pulled it back into the shop popped the hood and it sounds like a vacuum leak. I idles perfectly fine until you give it some gas. I have no idea what could of went wrong, we checked the map sensor, o2 sensor, etc. I'm hoping NAPA didn't give me the wrong flexplate. Does anyone have any experience in this department?



:EDIT: OP, watch your language...

Last edited by COSXJFAN; 01-09-2012 at 07:13 AM. Reason: Frustration = terrible grammar
Calhoon is offline   Reply With Quote
Old 01-07-2012, 08:53 PM   #2
Senior Member
 
Join Date: Aug 2011
Location: Landers, CA
Posts: 760

View rrich's Photo Album My Photos
Default

Of course you compared the new one with the old to make sure they were the same.
rrich is offline   Reply With Quote
Old 01-07-2012, 10:32 PM   #3
CF Veteran
 
ZINGGG's Avatar
 
Join Date: Oct 2011
Location: Seal Beach, CA
Posts: 4,440

View ZINGGG's Photo Album My Photos
Default

^^ yeah...
ZINGGG is offline   Reply With Quote
Old 01-08-2012, 12:58 AM   #4
Junior Member
Thread Starter
 
Join Date: May 2011
Posts: 35

View Calhoon's Photo Album My Photos
Default

Yeah we did match them up
Calhoon is offline   Reply With Quote
Old 01-08-2012, 01:10 AM   #5
CF Veteran
 
freegdr's Avatar
 
Join Date: Mar 2010
Location: Broward County Fl.
Posts: 46,530

View freegdr's Photo Album My Photos
Default

pinch some thing between tranny and block?

Last edited by freegdr; 01-08-2012 at 01:15 AM.
freegdr is offline   Reply With Quote
Old 01-08-2012, 01:48 AM   #6
Senior Member
 
Join Date: Aug 2011
Location: Landers, CA
Posts: 760

View rrich's Photo Album My Photos
Default

So why do you blame the flex plate when you matched them up to make sure they were identical?

Obviously it's something else you did.

Did you remove the CPS BEFORE switching flex plates - if not could you have damaged it? There's only about .003" clearance between them - and they are fragile.
rrich is offline   Reply With Quote
Old 01-08-2012, 01:50 AM   #7
CF Veteran
 
freegdr's Avatar
 
Join Date: Mar 2010
Location: Broward County Fl.
Posts: 46,530

View freegdr's Photo Album My Photos
Default

Quote:
Originally Posted by rrich View Post
So why do you blame the flex plate when you matched them up to make sure they were identical?

Obviously it's something else you did.

Did you remove the CPS BEFORE switching flex plates - if not could you have damaged it? There's only about .003" clearance between them - and they are fragile.
exactly were both on the same page
freegdr is offline   Reply With Quote
Old 01-08-2012, 08:35 AM   #8
CF Veteran
 
Join Date: Apr 2008
Posts: 13,952

View SeriousOffroad's Photo Album My Photos
Default

Quote:
Originally Posted by Calhoon View Post
So I've spent all day at the shop swapping in a new flex plate. We finished everything up start it up check all the gears, start backing up and the timing was off. It wont reach over 10mph but when I get it over 1000rpm it will miss fire and feels like it's ran out of gas. I pulled it back into the shop popped the hood and it sounds like a vacuum leak. I idles perfectly fine until you give it some gas. I have no idea what could of went wrong, we checked the map sensor, o2 sensor, etc. I'm hoping NAPA didn't give me the wrong flexplate. Does anyone have any experience in this department?
Let's back up to square one shall we.

Always start your posts with make, model, and year. Is your engine a 4.0L or a 2.5L

Sounds like a vacuum leak....check all you vacuum lines, even the ones you didn't touch.

Did you remove the intake and exhaust? Are you 110% certain you re-installed them correctly? Did you get the correct gasket? There 2 flavors...
SeriousOffroad is offline   Reply With Quote
Old 01-09-2012, 12:32 PM   #9
Junior Member
Thread Starter
 
Join Date: May 2011
Posts: 35

View Calhoon's Photo Album My Photos
Default

Quote:
Originally Posted by SeriousOffroad View Post
Let's back up to square one shall we.

Always start your posts with make, model, and year. Is your engine a 4.0L or a 2.5L

Sounds like a vacuum leak....check all you vacuum lines, even the ones you didn't touch.

Did you remove the intake and exhaust? Are you 110% certain you re-installed them correctly? Did you get the correct gasket? There 2 flavors...
It's an 89 xj with a 4.0, we check every vacuum line and didn't find anything out of the ordinary. We checked my fuel regulator and drops of gas were coming from the wrong end which is obviously bad but it doesn't explain the state of the jeeps condition. The help I'm receiving is much apreciated by the way!
Calhoon is offline   Reply With Quote
Old 01-09-2012, 01:44 PM   #10
CF Veteran
 
Join Date: Apr 2008
Posts: 13,952

View SeriousOffroad's Photo Album My Photos
Default

Sounds like you need to put a fuel pressure gauge on and see what's happening with the pressure.
SeriousOffroad is offline   Reply With Quote
Old 01-09-2012, 03:43 PM   #11
Renix Super Guru
 
BlueXJ's Avatar
 
Join Date: Mar 2008
Location: In yourz postez fissin jurr spelinzs
Posts: 24,653

View BlueXJ's Photo Album My Photos
Default

Check the intake manifold bolts too. They back out and even though you never touched them the movement may have caused them to allow a vacuum leak. See how much vacuum your engine is pulling at idle.
Leaking fuel regulator can cause a fire, so replace it. The only way it is getting fuel on the vacuum side is a pinhole in the internal diaphragm.
BlueXJ is offline   Reply With Quote
Old 01-09-2012, 04:03 PM   #12
CF Veteran
 
Bustedback's Avatar
 
Join Date: Feb 2010
Location: Oroville, CA
Posts: 12,368

View Bustedback's Photo Album My Photos
Default

Quote:
Originally Posted by Calhoon View Post
It's an 89 xj with a 4.0, we check every vacuum line and didn't find anything out of the ordinary. We checked my fuel regulator and drops of gas were coming from the wrong end which is obviously bad but it doesn't explain the state of the jeeps condition. The help I'm receiving is much apreciated by the way!
Do you mean there is fuel dripping out of the vacuum hose nipple on the pressure regulator? If so, you have a ruptured diaphram in the regulator and unmetered fuel in being sucked through the vacuum hose and into the intake. That would cause a pretty crappy running condition.
Bustedback is offline   Reply With Quote
Old 02-15-2012, 08:10 PM   #13
Junior Member
Thread Starter
 
Join Date: May 2011
Posts: 35

View Calhoon's Photo Album My Photos
Default

I went to NAPA got another flex plate, we through it in for the heck of it and it worked. When we pulled the faulty flex plate out, everything seemed like it looked normal until we laid them face down next to each other and one was taller than the other. I don't know if that's enough to make it run like it did, but i'm assuming it was cause everything else matched up.
Calhoon is offline   Reply With Quote
Old 02-15-2012, 08:16 PM   #14
CF Veteran
 
Cherockee's Avatar
 
Join Date: Aug 2010
Location: Williamsport, Pa
Posts: 1,167

View Cherockee's Photo Album My Photos
Default

How about the holes around the outside edge? The 2.5L and 4L flexplates looks the same but have different number of holes. These holes are what the crank sensor is reading.
Cherockee is offline   Reply With Quote
Old 02-15-2012, 08:21 PM   #15
Junior Member
Thread Starter
 
Join Date: May 2011
Posts: 35

View Calhoon's Photo Album My Photos
Default

Yeah, those matched up also. NAPA had the defective one sent off the the manufacture that they got it from and they should be able to tell me what all is wrong with it. I'm just happy I don't have to drive my fiance's s10 blazer anymore.
Calhoon is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
The TOOL thread roninofako Off-Topic Discussion 526 03-12-2017 10:26 PM
There goes the neighborhood... KyMoonshine Introductions 4 09-04-2015 02:12 PM
No buS help ammonllewis1 OEM Cherokee Technical. All factory issues and info go here! 9 08-31-2015 11:27 AM
3" BDS Suspension Lift Kit - Jeep Cherokee XJ ROCKRIDGE 4WD Vendor Showcase 0 08-25-2015 06:49 PM
Set-up with set-up bearings is perfect, but can't fit pressed bearing back in housing thebyus Modified Cherokee Tech 3 08-25-2015 06:02 PM



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 Off
Pingbacks are Off
Refbacks are Off



All times are GMT -5. The time now is 04:29 PM.


 
  • Ask a Question
    Get answers from community experts
What's your question?
Send