93 ranger rough idle 4.0 elt - Ranger-Forums - The Ultimate Ford Ranger Resource

4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

93 ranger rough idle 4.0 elt

Reply

 
 
 
  #1  
Old 4 Weeks Ago
Member
Thread Starter
Join Date: Jun 2018
Location: Sacramento
Posts: 13
93 ranger rough idle 4.0 elt

I have a 93 ranger 4.0 a4ld . It has a rough idle and surge some times. There are no codes present. When it surges the check engine light comes on but goes off when it stops surging. Can any one help me please It also passed a smog check here in California last month with this engine miss. That just seems weird to me.
 
Reply With Quote
  #2  
Old 4 Weeks Ago
RF Veteran
iTrader: (1)
Join Date: Jan 2014
Location: Vancouver, BC
Posts: 10,240
I would do these things:
Clean the MAF sensor
Clean IAC Valve
Check gap on spark plugs, 0.054
If spark plug wires are original replace them, Motorcraft wires last about 10 years

Run a can of Seafoam, or similar cleaner, in the gas tank; do this once a year, always smooths out idle on my 4.0l OHV

How to clean IAC Valve seen here: https://www.explorerforum.com/forums...-w-pics.84220/

Pay attention to spark plug wiring on coil pack
3 4
2 6
1 5
Front

The 5 6 4 side often gets mixed up, at the coil or at the cylinders
 
Reply With Quote
  #3  
Old 4 Weeks Ago
Member
Thread Starter
Join Date: Jun 2018
Location: Sacramento
Posts: 13
Thank you for the info. I will try those things
 
Reply With Quote
  #4  
Old 1 Week Ago
Member
Thread Starter
Join Date: Jun 2018
Location: Sacramento
Posts: 13
The problem ended up being the heated 02 sensor fuse. I put in a new fuse and it runs great. I hope this will help some one else.
 
Reply With Quote
 
 
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
ChargerOnDavins
2.9L & 3.0L V6 Tech
3
03-23-2015 04:25 PM
whiskeybreath
SOHC - 2.3L & 2.5L Lima Engines
1
11-27-2014 05:06 PM
96ranger
SOHC - 2.3L & 2.5L Lima Engines
1
05-24-2010 07:35 PM
jz
4.0L OHV & SOHC V6 Tech
0
05-14-2009 10:42 PM
Xer0Crash
General Technical & Electrical
9
04-09-2008 02:18 PM


Thread Tools
Search this Thread
Quick Reply: 93 ranger rough idle 4.0 elt


Contact Us Sitemap Advertising Cookie Policy Privacy Statement Terms of Service

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.