Northern California Ford racer's Message Board Forum Sell & Buy Ford Parts in Northern California Classifieds Mustang Pictures / Videos of Ford Cars in Northern California

Northern California Ford Owners  


Post New Topic  Post a Ford message board Reply
read DMs/my profile login | join CAFords | search | faq |
  next oldest topic   next newest topic
» Northern California Ford Owners     » Automotive   » Tech Talk   » Rough idle, lots of exhaust

- Email this post to someone!    
Author Topic: Rough idle, lots of exhaust
Overkil5.0
¯
Member # 3358

Ford Icon 1 posted      Profile for Overkil5.0  Ford pictures for Overkil5.0    Send New Direct Message       Edit/Delete Post   Reply With Quote       Share this CAFords post on FB
Just put in a new 5.0 HO crate motor into my 87 GT and it's running really rough. It is also spitting out a lot of exhaust. I changed the O2 sensors, that helped a little. I changed the EGR valve with only mild changes to idle. I know my air check valve is bad, not sure if this would cause these conditions. I think it might have something to do with the fuel system. Any help would be greatly appriciated.
Posts: 23 | Registered: Oct 2003  |  :
Quick 88LX
¯
Member # 1950

Ford Icon 1 posted      Profile for Quick 88LX  Ford pictures for Quick 88LX  Author's Homepage     Send New Direct Message       Edit/Delete Post   Reply With Quote       Share this CAFords post on FB
Is it a stock 5.0 motor? If so, I would definitely grab a chiltons manual and do everything listed in there for a normal tune up. I bet you are just missing something like a vacuum line or something... But since you just dropped an entire motor it could be anything.

-Start by checking everything electrical like spark plugs, cap and rotor etc. -Check all fuel related components. -Make sure all your vacuum lines are good and you have no leaks. -Check all of your smog shit to make sure that works as well.

If all else fails, pull some codes and you will be able to fix her right up.

--------------------
"Men are Made, Not Born"
Car Picture : http://www.angelfire.com/theforce/quick88lx/
Original Member #495. Can I get my number back?
Posts: 1785 | From: Fairfield, CA/Okinawa, Japan | Registered: Oct 2002  |  :
S351-R
CAFords OG
Member # 1605

Ford Icon 1 posted      Profile for S351-R  Ford pictures for S351-R    Send New Direct Message       Edit/Delete Post   Reply With Quote       Share this CAFords post on FB
quote:
Originally posted by overkil5.0:
Just put in a new 5.0 HO crate motor into my 87 GT and it's running really rough. It is also spitting out a lot of exhaust. I changed the O2 sensors, that helped a little. I changed the EGR valve with only mild changes to idle. I know my air check valve is bad, not sure if this would cause these conditions. I think it might have something to do with the fuel system. Any help would be greatly appriciated.
Double check all the basics first (correct firing order, ignition timing, vacuum leaks, etc.)
You may have just missed something. Some more information on your combination may help us out in helping you out also (stock spec motor? aftermarket cam? MAF conversion done?).
Posts: 344 | From: Earth | Registered: Jul 2002  |  :
Overkil5.0
¯
Member # 3358

Ford Icon 1 posted      Profile for Overkil5.0  Ford pictures for Overkil5.0    Send New Direct Message       Edit/Delete Post   Reply With Quote       Share this CAFords post on FB
Thanks for the info guys, much appreciated. It turned out to be a vacuum.
Posts: 23 | Registered: Oct 2003  |  :


 
Post New Topic  Post a Ford message board Reply Close Topic   Feature Topic   Move Topic   Delete Topic next oldest topic   next newest topic
- Printer friendly view of this Ford topic
Hop To:

Questions/Requests/Suggestions? email CAFords



Fueled by Ford Mustang Owners
on CaliforniaFords.com