After new heads rough idle - JeepForum.com
Reply
 
LinkBack Thread Tools
post #1 of 25 Old 04-05-2020, 12:28 PM Thread Starter
Tobeornottobe
Registered User
2005 WK 
 
Join Date: Oct 2015
Location: Saskatoon
Posts: 206
After new heads rough idle

Hi I just had new heads (rebuild) and timing chains done, after this there is a rough idle that was not there before! Smoke test was done , no leaks except from egr valve, which he said was normal. New plugs , iac checked, injector cleaner used, cam position Sensor replaced.
All things look good on his scan tool, was bit of talk about load %... but not sure. This is pix of reading from my scanner. Any one see issues?
Any help would be great! I drove 2000 miles since install so things should be worn in seated!!

Attached Thumbnails
80A1F10E-9700-4D9F-BB01-F7B5B3D062D8_1586111252330.jpg   CF52AFEC-D887-46BC-99A6-173DEE3488BE_1586111279500.jpg  
Tobeornottobe is offline  
Sponsored Links
Advertisement
 
post #2 of 25 Old 04-05-2020, 05:41 PM
azzkicker
Registered User
2007 WK 
 
Join Date: Dec 2016
Location: Beaverton
Posts: 1,113
That's terrible news. I've been thinking I'll need new heads sooner or later, so I'm hoping for a success story here.


I'm out of my element here, especially if you think the computer is causing the miss, not a mechanical problem. My first thought is always to verify they got the cam timing right, but it seems like it should do worse than just idle poorly.



When you say no leaks, you have verified no intake leaks? I haven't done this smoke test, but I gathered it was for finding exhaust leaks, just from the context of where else I saw one mentioned.



If you don't get any better advice than mine (you're screwed), try a pm to 90grandoneer. He seems to have modified almost everything, and remembers how he got it work again
Good luck!

07 WK 5.7 QD2, 4" lift, 33X10" tires, two M8000s
ARB twin air,Dual AGM group 49, sliders and skids
azzkicker is offline  
post #3 of 25 Old 04-06-2020, 07:58 AM Thread Starter
Tobeornottobe
Registered User
2005 WK 
 
Join Date: Oct 2015
Location: Saskatoon
Posts: 206
Yes I was watching over his shoulder as smoke test was being done! No leak at intake!
Thanks for the info!
Tobeornottobe is offline  
 
post #4 of 25 Old 04-06-2020, 09:16 AM
jtec
Web Wheeler
 
jtec's Avatar
2014 JK Wrangler 
 
Join Date: Oct 2017
Posts: 8,023
maybe -
graph B2S1 see if its trending rich,
Ignition components - correct plugs?
Check pending, and look at misfire counter - see if any cyl running higher than others.

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
jtec is offline  
post #5 of 25 Old 04-06-2020, 09:41 AM
RCS1300
Registered User
2005 WK 
 
Join Date: May 2014
Location: Stamford
Posts: 1,373
I put new heads in my 4.7 2005 due to a sticking valve(s). My fuel trims were off at idle and found that my EGR valve was leaking too - learned about it from a smoke test done by an independent mechanic. Replaced it and problem went away. Also, make sure your sensors are ALL oem. That new Crank sensor?

I agree to look at the misfire counter by cylinder. That will tell you if you have a global problem or a localized one - like an injector clogged with ethanol or an ignition wire not securely fastened.
RCS1300 is offline  
post #6 of 25 Old 04-06-2020, 09:50 AM Thread Starter
Tobeornottobe
Registered User
2005 WK 
 
Join Date: Oct 2015
Location: Saskatoon
Posts: 206
Jtek new plugs are champion , the fuel trim numbers are on the pic I added,
Tobeornottobe is offline  
post #7 of 25 Old 04-06-2020, 09:52 AM Thread Starter
Tobeornottobe
Registered User
2005 WK 
 
Join Date: Oct 2015
Location: Saskatoon
Posts: 206
The sensor is oem! And shows no miss fires!
Tobeornottobe is offline  
post #8 of 25 Old 04-06-2020, 10:06 AM
RCS1300
Registered User
2005 WK 
 
Join Date: May 2014
Location: Stamford
Posts: 1,373
Quote:
Originally Posted by Tobeornottobe View Post
The sensor is oem! And shows no miss fires!
If there are no misfires, how rough is it running?

Did you do a compression test on all cylinders to make sure that each is within 15 percent of the average?

I did that on my engine to simply get a baseline. I found that one cylinder in the newly re manufactured engine heads was about 15 percent lower than the average but I let it go.

Are you getting air bubbles in your radiator overflow tank that may indicate an engine head gasket is not correctly sealed? Another way to roughly determine this is to take out the plugs and look for one that has the porcelain a very clean white - as radiator fluid will clean the combustion chamber and anything in it like a spark plug.
RCS1300 is offline  
post #9 of 25 Old 04-06-2020, 10:34 AM
jtec
Web Wheeler
 
jtec's Avatar
2014 JK Wrangler 
 
Join Date: Oct 2017
Posts: 8,023
did you look at B2S1?
something caught my eye, I would look at o2 voltage swing high to low.

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
jtec is offline  
post #10 of 25 Old 04-06-2020, 11:48 AM Thread Starter
Tobeornottobe
Registered User
2005 WK 
 
Join Date: Oct 2015
Location: Saskatoon
Posts: 206
No I did not look at compression... figured it should be good, new heads and all! Well it shakes the doors and hood when idle, runs ok otherwise, and no air bubbles in overflow tank,
Tobeornottobe is offline  
post #11 of 25 Old 04-06-2020, 11:51 AM Thread Starter
Tobeornottobe
Registered User
2005 WK 
 
Join Date: Oct 2015
Location: Saskatoon
Posts: 206
Jtek ok I’ll have a look at them soon , snowing like crazy here today!!
Tobeornottobe is offline  
post #12 of 25 Old 04-06-2020, 11:57 AM Thread Starter
Tobeornottobe
Registered User
2005 WK 
 
Join Date: Oct 2015
Location: Saskatoon
Posts: 206
Can I add videos here?
Tobeornottobe is offline  
post #13 of 25 Old 04-06-2020, 12:51 PM
RCS1300
Registered User
2005 WK 
 
Join Date: May 2014
Location: Stamford
Posts: 1,373
Could the timing be off one tooth? I replaced my three timing chains when I did my engine heads. It was a little tricky to get the chains on. I had to zip tie them to the bottom pulley.
RCS1300 is offline  
post #14 of 25 Old 04-06-2020, 01:40 PM Thread Starter
Tobeornottobe
Registered User
2005 WK 
 
Join Date: Oct 2015
Location: Saskatoon
Posts: 206
RC the mechanic said it wouldn’t run or real bad if timing is off! Said there is jigs they use and can’t be off!!
Tobeornottobe is offline  
post #15 of 25 Old 04-06-2020, 02:51 PM
RCS1300
Registered User
2005 WK 
 
Join Date: May 2014
Location: Stamford
Posts: 1,373
If it were my vehicle, I would pull the plugs and do a compression test on all cylinders. Check to see if you have a white porcelain (porcelain cleaned white due to radiator fluid leak through head gasket) plug too. That would rule out a mechanical issue (valve closing, head gasket, etc).

Before the compression test, check your scanner again. See if you can turn off all the Indicators except the fuel trims. The fuel trims react more slowly with many other Indicators on. What I would look for is fuel trims at idle to see if you have a meaningful vacuum leak - EGR, or other. For example, are the combined fuel trims (long plus short per bank) still less than 10 percent. If so, then do the compression test.
RCS1300 is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may 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 On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome