1989 f150 302 misses at low speeds - Ford F150 Forum - Community of Ford Truck Fans

Go Back   Ford F150 Forum - Community of Ford Truck Fans > Pre-1997 F150 > 1987 - 1996 F150
Log In 


1989 f150 302 misses at low speeds

Reply
 
 
 
 
Thread Tools Search this Thread
Old 11-19-2009, 03:00 PM   #1
Junior Member
 
Join Date: May 2009
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Default 1989 f150 302 misses at low speeds

I have new plugs wires dist. cap coil and still. it started after i uesed seafoam any ideas? thank you
CB78379 is offline   Reply With Quote
Join F150 Forum

Join F150Forum.com Today - It's Totally Free!

Are you a Ford F150 fan? If so we invite you to join our community and see what it has to offer. Our site is specifically designed for you and it's a great place for Ford F150 Fans to meet online.
Once you join you'll be able to post messages, upload pictures of your truck, and have a great time with other Ford F150 fans. Whether your an old timer or just bought your F150 you'll find that F150Forum.com is a great community to join. Best of all it's totally free!

Join F150Forum.com Today! - Click Here JOIN FOR FREE


-->
Old 11-19-2009, 03:06 PM   #2
Administrator
5 Year Member
 
ymeski56's Avatar
 
Join Date: Jul 2008
Location: Long Beach Calimexifornia
Posts: 32,387
Thanked 739 Times in 425 Posts
Feedback Score: 0 reviews
Default

Quote:
Originally Posted by CB78379 View Post
I have new plugs wires dist. cap coil and still. it started after i uesed seafoam any ideas? thank you
How did you apply it?
__________________
"Saving the World....One Ford Truck at a Time."
#BlueLivesMatter
ymeski56 is online now   Reply With Quote
Old 11-20-2009, 06:07 PM   #3
Member
 
Join Date: Nov 2009
Posts: 46
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Default

wierd! I was kind of having the same issue. I felt a little "lobing" when idling/ really low speeds, and after I used seafoam now its more persistent. it used to come and go when idling, but now its doing it everytime im idling.

someone else fixed their lobing by replacing the map sensor. I don't know if we're having the same issues. but im gunna keep an eye on this thread
Kphyle is offline   Reply With Quote
Old 11-20-2009, 06:13 PM   #4
I Voted For Bill and Opus
5 Year Member
 
transmaster's Avatar
 
Join Date: Nov 2007
Location: Cheyenne, Wyoming
Posts: 2,041
Thanks: 0
Thanked 5 Times in 5 Posts
Feedback Score: 0 reviews
Default

Check your injectors. Another cause for a loping idle is a worn timing chain.
__________________
My Carbon foot print is 57 tons per year, and that doesn't count my fart gas. I spend my carbon offset money on my 1995 F150 Flareside with a carbon spewing 5.0L V8.
transmaster is offline   Reply With Quote
Old 11-20-2009, 06:29 PM   #5
Member
 
Join Date: Nov 2009
Posts: 46
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Default

I did a little research for you in my book and I found a couple troubleshooting things.

Engine misses at idle speed:
1. Spark plugs worn, fouled or not gapped correctly
2. Fault in fuel or electrical systems
3. faulty spark plug wires
4. vaccuum leaks at intake or hose connections
5. uneven or low cylinder compression

Engine misses throughout driving speed range:
1. fuel filter clogged and/or impurities in fuel system
2. faulty spark plugs or gapped incorrectly
3. fuel/electrical system.
4. incorrect ignition timing
5. cracked distributor cap, disconnected distributor wires, or damaged distributor components.
6. defective spark plug wires
7. faulty emissions system components
8. cylinder compression
9. weak or faulty ignition system
10. vacuum leaks at throttle body/intake/ or vacuum hoses

I hope this helps. hopefully you can check some of the things off the list that can save you some money from having a mechanic do it!!

let me know if it does help
Kphyle is offline   Reply With Quote
Old 11-24-2009, 03:17 PM   #6
Junior Member
 
Join Date: May 2009
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Default

When i am driving then i let of gas then get back on the whole truck shakes really bad
CB78379 is offline   Reply With Quote
Old 11-24-2009, 04:23 PM   #7
Senior Member
 
flareside_thunder's Avatar
 
Join Date: Oct 2009
Posts: 1,526
Thanked 3 Times in 3 Posts
Feedback Score: 0 reviews
Default

Bad plugs, dirty IAC.......if you tell us how you ran the Seafoam through the system we can think this through a little better to help you determine your issues. If you dumped it into the tank a good possibility may be the fuel sock or fuel pressure regulator.
__________________
Burt- 1989 Ford F250 7.3 NA, Zf, 3.5" Straight Pipe Exhaust, 2001 SuperDuty Axles With 3.73 Gears, 5" Lift Using All Factory Parts, Captain's Chairs, G31 Batteries, NorthStar NS3000 CB With RK56 Mic & 102" SS Whip, Aircraft Landing Lights & 102dB Backup Beeper.
flareside_thunder is offline   Reply With Quote
 
 
 
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
2005 F150 5.4 Misfire problems jpn4791 General F150 Discussion 2 08-19-2015 08:13 PM
5.0 swap into 92 f150 Srutherford 1987 - 1996 F150 15 07-30-2015 08:39 PM
How many have the LS chatter issue? Blue_76 2009 - 2014 Ford F150 3 07-29-2015 02:40 PM
Mystery Drone/Whine, 2005 F150 texansport Maintenance Shop 1 07-29-2015 10:44 AM
'74 Maverick 302 w/GT40 heads? 94_FlareSide_5.Slow 8 Cylinder Engines 0 07-28-2015 12:10 AM


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 -4. The time now is 10:38 PM.


Copyright 2006 - 20011 F150forum.com
This site is in no way affiliated with the Ford Motor Company.