1986 Bronco II throttle problems
New User
Joined: Nov 2001
Posts: 4
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From: St. Louis USA
1986 Bronco II throttle problems
When i apply throttle between 1,100 and 2,000 rpm's the engine revs up and down. A lenghthy highway drive almost always cures it.This has been going on for a year now and absolutely NOBODY knows what is wrong. The car is practically new with all the parts I've put on. New;distributer,tps,idle air speed motor,in-tank fuel pump, fuel filter,coil,plugs,wires and a fuel pressure regulator(which is about 2 years old). Any input is highly welcomed.
Junior User
Joined: Apr 2001
Posts: 51
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1986 Bronco II throttle problems
Try cleaning your throttle body and IAC tubes. Take your throttle body right off the intake and seriously clean it. When I did mine it had between a sixteenth and an eighth of an inch of coking on the back of the butterfly. My rpms dropped when I barely pushed the gas and doing this took care of it. Use a screwdriver, chisel or whatever and get the big stuff off use a can (1 FULL CAN) of intake or carb cleaner to clean the whole thing good. while the throttle body is off remove your iac and clean the tube from it to the throotle body use a screwdriver to clean chunks of carbon out if it's as bad as mine was. hopefully this will help, if not I would check your tps using a volt meter. Check with a knowlegable mechanic or your dealer on the specs I would give them to you but I lost the paper that I had them written on.
Travis
Flatheadv8
*87 ranger STX
2.9, K&N, Magnaflow, MSD
31x10.50 BFG Mud terrains
15x8 Eagle 117's
6" skyjacker
Clarion deck/rears, alpine fronts,
Rocford Fosgate-punch 100,punch 250,and 10"XLC
Travis
Flatheadv8
*87 ranger STX
2.9, K&N, Magnaflow, MSD
31x10.50 BFG Mud terrains
15x8 Eagle 117's
6" skyjacker
Clarion deck/rears, alpine fronts,
Rocford Fosgate-punch 100,punch 250,and 10"XLC
New User
Joined: Mar 2002
Posts: 3
Likes: 0
1986 Bronco II throttle problems
,What you said worked for me; I brought my Bll and because I am not an experience stick driver I though that was my fault untill I notice tha from 1100 to 1600 rpm the engine would not respond to the accelerator and go up and down to that range...I read you answer and I removed the black hose. I was amazed, inside was 1/8 of an inch of old oil :-staun , the pcv valve was stuck open for a long time, God knows when, It took half of a can to clean it and, a new pcv valve and thanks God the truck was restored to almost normal. Then just for curiosity I checked the gas filter ... 
it was really dirty and cloged. Now the car runs excelent..
Thanks for your post.
Mac
it was really dirty and cloged. Now the car runs excelent.. Thanks for your post.Mac
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