Ford explorer 98 cold start rough idle - Ford Truck Enthusiasts Forums
 

Go Back   Ford Truck Enthusiasts Forums > Performance, Engines & Troubleshooting > Ford V6 > 2.6, 2.8, 2.9, 4.0 & SOHC 4.0 V6
Log In 


Ford explorer 98 cold start rough idle

Reply
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 02-09-2016, 07:05 PM
Ryleystr Ryleystr is offline
New User
 
Join Date: Feb 2016
Posts: 6
Ryleystr is starting off with a positive reputation.
Exclamation Ford explorer 98 cold start rough idle

Alright so I have a 4.0 sohc it runs great besides when I first start it it won't idle unless I run the engine at high rpms. I've checked for vacuum leaks replaced spark plugs and my coil pack along with my mass airflow sensor and my dpfe/egr sensor all have helped with performance. If I do drive it at high rpm for about 10 min it will idle but I would like to start it and let it warm up since it's winter and I'm getting tired of throwing money to just have little improvements with its overall driving. I do the repairs myself and would like to find a solution please help!!
Reply With Quote
  #2  
Old 02-09-2016, 07:06 PM
Ryleystr Ryleystr is offline
New User
 
Join Date: Feb 2016
Posts: 6
Ryleystr is starting off with a positive reputation.
I am curious if it has anything to do with the cat but I don't want to replace it if it doesn't help
Reply With Quote
  #3  
Old 02-09-2016, 10:26 PM
85e150six4mtod 85e150six4mtod is offline
Moderator
 
Join Date: Apr 2004
Posts: 18,480
85e150six4mtod has a superb reputation85e150six4mtod has a superb reputation85e150six4mtod has a superb reputation85e150six4mtod has a superb reputation85e150six4mtod has a superb reputation85e150six4mtod has a superb reputation85e150six4mtod has a superb reputation85e150six4mtod has a superb reputation85e150six4mtod has a superb reputation85e150six4mtod has a superb reputation85e150six4mtod has a superb reputation
Welcome to FTE.

Have you tried a code reader to see if there are any stored codes?

These commonly have intake o-ring and intake crack issues. You have checked for vacuum leaks, but did you check the manifold and manifold to head connections, not just vacuum lines?
Reply With Quote
  #4  
Old 02-10-2016, 05:36 AM
Ryleystr Ryleystr is offline
New User
 
Join Date: Feb 2016
Posts: 6
Ryleystr is starting off with a positive reputation.
Thank you. I have not checked the intake manifold O-rings I could check it out. But would that have anything to do with the fact that it's only when it's cold or could the O-rings expand once they heat up?
Reply With Quote
  #5  
Old 02-10-2016, 01:47 PM
xlt4wd90's Avatar
xlt4wd90 xlt4wd90 is offline
Postmaster
 
Join Date: Sep 2003
Location: SoCal
Posts: 4,998
xlt4wd90 is gaining momentum as a positive member of FTE.
If it reliably runs better once it's warmed up, I would suspect a temperature sensor. Have you tried pulling codes yet?
__________________
2004 Turner 5-Spot (weekend warrior)
1995 GT Zaskar (daily driver)
1990 Aerostar XLT E4WD (utility vehicle)
1987 Mustang GT, 1996 Cobra brakes, Contex/IPS suspension (track toy/money pit)
1969 Mustang Mach I, Global West suspension (money pit - II)
Reply With Quote
  #6  
Old 02-10-2016, 04:47 PM
Ryleystr Ryleystr is offline
New User
 
Join Date: Feb 2016
Posts: 6
Ryleystr is starting off with a positive reputation.
I did pull codes. I took it to auto zone and the code reader recommended a mass airflow sensor and that I was having miss fires in 1,5, and 6 with a few other codes like not getting enough fuel. I haven't been too worried about my mass airflow sensor since I replaced it less then two years ago. I'lol prolly pull codes again and see if anything comes up different and post the results. The codes are why I put a new coil packs in.
Reply With Quote
  #7  
Old 02-10-2016, 07:00 PM
85e150six4mtod 85e150six4mtod is offline
Moderator
 
Join Date: Apr 2004
Posts: 18,480
85e150six4mtod has a superb reputation85e150six4mtod has a superb reputation85e150six4mtod has a superb reputation85e150six4mtod has a superb reputation85e150six4mtod has a superb reputation85e150six4mtod has a superb reputation85e150six4mtod has a superb reputation85e150six4mtod has a superb reputation85e150six4mtod has a superb reputation85e150six4mtod has a superb reputation85e150six4mtod has a superb reputation
Misfire in a few cylinders points to plug, coil or vacuum leak at that cylinder. Since you did the plugs, o-rings become a suspect.

These usually give a lean code or an oxygen sensor code. The sensor isn't bad, it's just giving a code.

And to answer your earlier question, yes, once warm everything expands a bit.

As for the cat, which you mentioned earlier, if it were partially plugged you would still have a smooth idle but you would lack for power at higher revs and under load.
Reply With Quote
  #8  
Old 02-10-2016, 07:46 PM
Ryleystr Ryleystr is offline
New User
 
Join Date: Feb 2016
Posts: 6
Ryleystr is starting off with a positive reputation.
Ok that makes sense I pulled codes again and it did recommend intake gasket I was recommended to use a copper spray on the gasket and everything will be good what do you think?
Reply With Quote
  #9  
Old 02-11-2016, 07:36 PM
85e150six4mtod 85e150six4mtod is offline
Moderator
 
Join Date: Apr 2004
Posts: 18,480
85e150six4mtod has a superb reputation85e150six4mtod has a superb reputation85e150six4mtod has a superb reputation85e150six4mtod has a superb reputation85e150six4mtod has a superb reputation85e150six4mtod has a superb reputation85e150six4mtod has a superb reputation85e150six4mtod has a superb reputation85e150six4mtod has a superb reputation85e150six4mtod has a superb reputation85e150six4mtod has a superb reputation
Copper spray on the gasket....I don't think so. These are plastic on plastic with o-rings, not a one piece gasket like older/other engines with metal intakes. There are two parts to this video, and it is a bit tedious. BUT it gives a clear view of the process and the intake sealing surfaces.



Once you get on there, other Exploder/Ranger 4.0 SOHC videos show up.
Reply With Quote
  #10  
Old 02-12-2016, 01:24 PM
Ryleystr Ryleystr is offline
New User
 
Join Date: Feb 2016
Posts: 6
Ryleystr is starting off with a positive reputation.
Thank you I decided against the copper and I did buy all the gaskets
Reply With Quote
 
 
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
92 f-150 5.0 high idle, new iac and tps Anthonynoble 1987 - 1996 F150 & Larger F-Series Trucks 14 08-24-2016 04:13 PM
2.9L Running rough, bad mileage, I'm stumped! deere842 2.6, 2.8, 2.9, 4.0 & SOHC 4.0 V6 6 08-30-2015 11:54 PM
Missing during first driven miles, high idle jyblood 1999 - 2003 7.3L Power Stroke Diesel 5 07-24-2015 02:41 PM
99 F350 won't idle cntroes Modular V8 (4.6L, 5.4L) 5 03-09-2015 06:20 AM
IAC delete maybe? knlcasteel 1987 - 1996 F150 & Larger F-Series Trucks 8 10-06-2010 11:32 AM


Go Back   Ford Truck Enthusiasts Forums > Performance, Engines & Troubleshooting > Ford V6 > 2.6, 2.8, 2.9, 4.0 & SOHC 4.0 V6

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 On
Pingbacks are On
Refbacks are On

Forum Jump



All times are GMT -5. The time now is 11:06 AM.

 

Advertising - Terms of Use - Privacy Statement - Terms of Service - Jobs
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company.

vbulletin Admin Backup