'86 engine is reving!!!
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Joined: Aug 2001
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'86 engine is reving!!!
The 302 in my '86 F150XLT is reving beyond belief. At start up, I'm around 20000 rpm. It will come down to about 1000, but still surges. At a lower linkage, it dies as the surges go down. I've tried several things, but have been told this is typical with a sensor. Any ideas as to what sensor would cause this or if it's even a correct response? Have considered having the linkage checked, also... Is REALLY becoming a headache. HELP!!!
And thanks in advance to any emails!!!
And thanks in advance to any emails!!!
Cargo Master
Joined: May 2001
Posts: 3,208
Likes: 13
'86 engine is reving!!!
This is some what common in the early efi trucks. Clean or replace the air bypass valve. And insure there are no big vacuum
leaks ie
power brake unit, cruise control, heater controls.) The idle on these vehicles is controlled by how much air the computer allows to go around the throttle plates (vacuum leak). I do not remeber if an 86 truck is TBI or multiport efi either way they still have air bypass valves. The TBI units where bad about the gasket going bad between the tbi assmebly and the intake manifold.
leaks ie
power brake unit, cruise control, heater controls.) The idle on these vehicles is controlled by how much air the computer allows to go around the throttle plates (vacuum leak). I do not remeber if an 86 truck is TBI or multiport efi either way they still have air bypass valves. The TBI units where bad about the gasket going bad between the tbi assmebly and the intake manifold.
Tuned
Joined: Jul 2001
Posts: 430
Likes: 0
From: Deatsville, AL
'86 engine is reving!!!
I'd replace the Tach as well its reading high!!
Bob
'66 7 Litre, top loader, 3.25 Traction-lock, Sidewinder Intake, SCJ Exhaust
'88 F150 LWB 4x2, XLT Lariat, 302, 5 speed, 3.08
'99 Ranger, 4x2, 3.0, 5 speed, 3.73 posi
Bob
'66 7 Litre, top loader, 3.25 Traction-lock, Sidewinder Intake, SCJ Exhaust
'88 F150 LWB 4x2, XLT Lariat, 302, 5 speed, 3.08
'99 Ranger, 4x2, 3.0, 5 speed, 3.73 posi
NOW-- FIX IT!!! 
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