1989 f150 5.0l backfires through intake - Ford F150 Forum - Community of Ford Truck Fans



1989 f150 5.0l backfires through intake

Reply
 
 
 
Thread Tools Search this Thread
Old 02-20-2013, 02:47 AM   #1
Junior Member
Thread Starter
 
Join Date: Feb 2013
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Default 1989 f150 5.0l backfires through intake

Hi everyone I am having this problem with my 1989 f150 5.0l 4x4 the problem just started this winter. From about 1000 to 2000 rpm truck cuts out and almost dies then backfires through intake. You can rev it up a little more though and it will get past that and rev and run fine until I let it idle again then try to rev it up again. I have replaced fuel filter and cleaned egr valve. Under a load its even worse I have to slip the clutch just to get the truck to start to move. But once it gets past 2000 rpm it runs just fine until I upshift again. And when I put it in 4 wheel drive truck does not want to move at all just spits sputters and back fires. Any suggestions anybody? I know that the timing may have jumped but if it jumped wouldnt it run crappy the whole time not just from 1000 to 2000 rpm?
mathaw is offline   Reply With Quote
Old 02-20-2013, 05:02 AM   #2
Member
 
Join Date: Jul 2012
Posts: 127
Thanks: 0
Thanked 6 Times in 6 Posts
Default

you have a restriction in your exhaust
Tacoma is offline   Reply With Quote
Old 02-20-2013, 07:04 AM   #3
Administrator
5 Year Member
 
ymeski56's Avatar
 
Join Date: Jul 2008
Location: Long Beach Calimexifornia
Posts: 33,663
Thanked 895 Times in 506 Posts
Default

Cat back pressure is likely.

Especially common when running higher octane than 87, it is specifically engineered to run on.
ymeski56 is offline   Reply With Quote
Old 02-20-2013, 08:32 AM   #4
Hi-Rev Motorsports
5 Year Member
 
dr_bowtie's Avatar
 
Join Date: Aug 2009
Location: Northern Indiana
Posts: 4,884
Thanks: 0
Thanked 52 Times in 52 Posts
Default

check cap and rotor... you could have spark scatter... also check TPS voltage thru the sweep...

beings it is only in one part of the RPM range I'd rule out exhaust back pressure and anything valve/cam related... those would remain constant through the rpm range....
dr_bowtie is offline   Reply With Quote
Old 02-20-2013, 10:11 AM   #5
Junior Member
Thread Starter
 
Join Date: Feb 2013
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Thanks for advice guys dont think its exhaust it has no cats and it has shorty headers im thinking it is pry something to do with distributor or icm
mathaw is offline   Reply With Quote
Old 02-20-2013, 03:23 PM   #6
Junior Member
 
Join Date: Oct 2012
Posts: 7
Thanked 2 Times in 2 Posts
Default

I'm really thinking it's a cracked distributer cap....
Mike Demny is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
F150 1996 Fuel Pumps will not Activate kenw Electrical 3 11-13-2016 10:34 PM
Just Bought New F150! Need Wheels, Tune, Intake & MORE Plz Help. larry_chip 2015 - Present Ford F150 12 02-12-2016 05:46 PM
Little to almost no power while towing reader585 Maintenance Shop 2 09-10-2015 09:10 AM
1989 F150 engine change out gwilson3174 1987 - 1996 F150 2 09-05-2015 10:44 PM
Loyal F-truck owner gwilson3174 Introductions 0 09-02-2015 11:46 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 -4. The time now is 06:18 AM.


Copyright 2006 - 2016 F150Forum.com