'89 F-150 302 wont run smooth, getting frustrated..
10-17-2011, 02:32 AM
#11
With Great Patience...
Thread Starter
Join Date: Jul 2011
Location: Mariposa, CA
Posts: 90
Likes: 0
Received 0 Likes
on
0 Posts
Usually, 1/3 can of Seafoam, sucked through the power brake booster /vac at a warm idle (treating for Combustion Chamber deposits) & the rest added to the gas, improves both idle & throttle response. But that's not indigenous to "Ford's in particular. Any make would benefit.
See link:https://www.f150forum.com/f33/how-se...-1991-a-31505/
I would skip adding 1/3 to oil to disludge, unless planning on change prior to test.
See link:https://www.f150forum.com/f33/how-se...-1991-a-31505/
I would skip adding 1/3 to oil to disludge, unless planning on change prior to test.
Last edited by ymeski56; 10-17-2011 at 10:33 AM.
10-17-2011, 09:05 AM
#13
Ahahahahahaha!!!
When is the last time you changed your PCV valve and/or air/breather filter? If you don't know it wouldn't hurt to put new ones in. Could address the oil issue with your old sensors.
Last edited by Buddhaman; 10-17-2011 at 09:42 AM.
10-17-2011, 10:46 AM
#15
Senior Member
Join Date: Jul 2008
Location: Long Beach Calimexifornia
Posts: 58,557
Received 1,162 Likes
on
647 Posts
I had my PCV hose collapsing from age. It would pull the vapor into the hose, then collapse on itself, where the vapor condensed, eventually being pulled out in fluid form. Mine is an 87' 302.
10-17-2011, 10:52 AM
#16
Senior Member
Join Date: Jul 2008
Location: Long Beach Calimexifornia
Posts: 58,557
Received 1,162 Likes
on
647 Posts
Check of fuel pressure at fuel rail would be helpful.
Loping idle is usually a vac leak somewhere though.
A cracked or loose fit at a connection would do it.
Loping idle is usually a vac leak somewhere though.
A cracked or loose fit at a connection would do it.
10-17-2011, 10:42 PM
#18
Master of Sanctity
Join Date: Jul 2011
Location: Palm Bay, FL
Posts: 23
Likes: 0
Received 0 Likes
on
0 Posts
I had some problems like this recently with my '92, had vacuum leaks, electrical connections not plugged in right, but the thing that helped the most was re-setting the timing, and making sure the spark plug wires were separated. I was told by someone I work with that sometimes spark plug wires on Ford engines will arc off of each other if they are too close. Check the wires for evidence of that, looked like white talcum powder.
10-18-2011, 02:16 AM
#19
Junior Member
Join Date: Oct 2011
Posts: 1
Likes: 0
Received 0 Likes
on
0 Posts
I had that problem with my 89 302... all i did was shoot the crap out of the idle body and idle with WD-40... and oddly enough and shooting it... ive had no problems... mechanics told me that there was nothing i could do.. its just cold blooded.. .. i dunno... GOOD LUCK
10-18-2011, 02:22 AM
#20
With Great Patience...
Thread Starter
Join Date: Jul 2011
Location: Mariposa, CA
Posts: 90
Likes: 0
Received 0 Likes
on
0 Posts
I had some problems like this recently with my '92, had vacuum leaks, electrical connections not plugged in right, but the thing that helped the most was re-setting the timing, and making sure the spark plug wires were separated. I was told by someone I work with that sometimes spark plug wires on Ford engines will arc off of each other if they are too close. Check the wires for evidence of that, looked like white talcum powder.
Plugs are brand new and are gapped correctly, they probably have 20 miles on them and don't have a real burn pattern yet.
Dont think this truck has a PCV valve (will confirm this next sunday or maybe wednesday if I'm not working), but the hose is not collapsing, and the air filter is new.
The whole thing is starting to seem kinda silly to me... I'll check the Fuel Pressure next chance I get and will replace the Oxygen sensor.
Last edited by ymeski56; 10-18-2011 at 03:14 AM.
