Rough idle after plugs, wires and coil pack. - Ranger-Forums - The Ultimate Ford Ranger Resource


General Technical & Electrical General technical and electrical discussion for the Ford Ranger that does not fit in any other sub-forum.

Reply
 
LinkBack Thread Tools Search this Thread
  #1  
Old 10-17-2013
Member
Thread Starter
 
Join Date: Oct 2013
Location: Meriden Ct.
Posts: 4
Rough idle after plugs, wires and coil pack.

Hey folks, Not too sure, but I think I may have cracked the porcelain on the passenger side middle or rear plug while doing a tune up. This is the 4.0 SOHC and, as you probably already know, those two particular plugs are quite difficult to get to. I also changed out the wires and coil pack. Before I did them, I replaced all four catalytic converters & 3 new Bosch oxy sensors. I ran the truck after the cat change and it had a ton more power! I think I was running lean on the right bank beforehand, which I believe led to the demise of the stock cat's, so I did the tune-up just in case there was a ignition problem. I now have high quality stainless cat's and as mentioned, all new oxy sensors, new plugs, wires and coil pack, also cleaned the MAF sensor with CFC. After installing the last item (plugs) I started it up only to hear (and feel) what appears to be a missfire, also smell fresh gas (running rich) so I'm thinking I may have inadvertently crossed a couple wire's or possibly cracked the porcelain on one or more of the pass. side plugs. After I finished, I didn't let it run long enough to trigger a light but it most likely would have. I do not look forward to having to pull the inner fender plastics again and redo the right side plugs over. I know that it's no big deal for most folks, but my problem is that I have a 1 year old son and I can only work on the truck between his naps, which are usually short lived! I also used an older spark plug socket with no protective rubber insert which could possibly have led to a cracked plug. I don't have a scanner so I can't narrow it down to a specific cylinder. I'd also like to see a wiring diagram for the coil pack/plug wires so I can be sure I got them in the right spot's but I can't seem to find a definitive diagram online for the 4.0 SOHC. Any thoughts would be greatly appreciated. The truck is basically stock, except for a Super chip, K&N air intake coupled with a Granatelli MAF and a stainless Bassani Aft cat exhaust.
Reply With Quote
  #2  
Old 10-17-2013
Member
Thread Starter
 
Join Date: Oct 2013
Location: Meriden Ct.
Posts: 4
Sorry! I noticed that there was a 4.0 Tech column AFTER I posted this here.
Reply With Quote
  #3  
Old 11-02-2013
Member
 
Join Date: Nov 2013
Location: Toronto
Posts: 4
Yep, sounds like you have mixed up the wire sequence when putting them back on the plugs. (Either that or your gap is way off on the spark plug).
Reply With Quote
  #4  
Old 11-02-2013
Member
Thread Starter
 
Join Date: Oct 2013
Location: Meriden Ct.
Posts: 4
Na, neither, it actually turned out to be broken porcelain on the right side center spark plug. I used an old socket without the rubber protector inside it. The wiring was actually correct.
Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Mechanic says I need coil pack, wires and plugs. dez10 General Technical & Electrical 7 02-16-2012 11:22 AM
Plugs/Wires (wires bad) ROSCO 4.0L OHV & SOHC V6 Tech 8 11-02-2011 12:01 PM
Coil pack and spark plugs question Sic'em Bears General Technical & Electrical 7 01-10-2011 07:48 AM
2.5 L Ranger running rough after plugs and wires! IBleedBlue331 General Technical & Electrical 8 11-30-2010 06:53 PM
Plugs/wires/coil pack, etc 05Edge-04GT General Ford Ranger Discussion 3 03-29-2009 12:52 PM


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 -6. The time now is 10:55 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.