Question about 1986 Ford F150 SuperCab

1 Answer

My 1986 Ford F-150 5.0 EFI runs good, but when I start it it revs to 1700 rpm untill I give it a little gas then it drops to normal rpm. How do I stop it from the high revs when started?

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Expert
  • 233 Answers

Does it rev high when started cold or hot? If it does it either hot or cold, check the throttle position sensor on throttle body. If that is not bad, then check the automatic choke sensor.

Posted on Jul 12, 2010

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

What makes the car start and run but gauges go off and key light comes on


The first part is magic, (EFI system and good engine)
but?????
gauges go off can be a bad fuse or loose fuse to cluster.
when any Gas engine stalls. the RPM drops to 0
the EFI sees that and goes to key on, not started self test.
this is covered in the operator guide.
key light comes on KEY LIGHT, HUMMMMMMM
Let me look at the waring lamps, there are many.
one light is engine overheat that is logo of a thermometer but looks
just like a key.
http://dashboardsymbols.com/the-symbols/
is this a engine stall post
or engine runs perfect all the time , but only my dash acts funny
you didnt say?

key lamp?
immoblilzer (big trouble there)

a stall is anytime engine RPM drops to zero. called a STALL.
if your cars engine stalls, post that way, the lamps are all normal
on at any stall, on any car.
at a stall , rpm goes to zero and MPH drops to zero as you coast to a stop , stalled. that is all normal for any stall.

if engine stalls.
that is complex.
here is list.
  1. lost 12vdc power to EFI system. (battery died, fuse blown)
  2. never gave your car the 60,000 mile tune up, see opr, guide.
  3. bad fuel.
  4. overheated the engine.
  5. engine oil gone, never ever checked at each fill up.
  6. other more complex EFI system parts failures, ASK.

May 03, 2014 | 2002 Jeep Grand Cherokee

1 Answer

89 Chevy Sprint takes about 5 minutes to warm up to be able to drive away or it stalls when I give it gas. The engine will rev up for 3-4 seconds then drop down and almost stall and then rev again during...


Plug the vacuum line you unplugged and the idle should come back. Change your air filter and the map sensor. check for correct coolant level and replace the coolant temp. sensor. This sensor affects cold starting and idle through the ECU (open loop mode, rich fuel mapping and 1200 rpm idle) It should go to closed loop mode in the ECU once engine warm up is achieved ( lean fuel mapping and normal 900 rpm idle). Do not unplug anything else till you perform an OBDII scan of the stored fault history

Jun 14, 2017 | Chevrolet Sprint Cars & Trucks

1 Answer

Vehicle rev's or accelerates fine when started for just a minute. Then it wont rev up. When you push on the gas it just struggles. Wont really go much above 1500-1700 rpm. idles ok. It is a gasonline...


that sounds like a fuel delivery problem. either the filter is clogged or the pump is not delivering the right pressure. i assume you have no check engine light. this would not set one but other problems like sensors would. being 11 yrs old i would not be surprised if the fuel pump was worn out. good luck

May 22, 2010 | 1999 Ford F350 Regular Cab

1 Answer

1986 Mustang 5.0 wont stay running very long with loss of power


it sounds like a stun gun?? you are losing spark, get it in a dark place or at night and look under the hood for the lost spark, spray water on the cap and wires, youll find it

May 18, 2010 | 1986 Ford Mustang

2 Answers

How do i get a 1986 ford f-150 with a efi 302 (5.0) engine and auto trans to restart after running out of fuel?


When you turn on the key, the fuel pump starts and runs for one second. Under normal circumstances this is long enough the bring the fuel pressure in the fuel rails up to spec. But it is not long enough once you run the fuel system dry. The easiest way to remedy this is to turn your key on and off six to eight times with 2~3secs interval. If there is no problem in the system, this will get the fuel pressure up in the rails and the engine will start.

May 01, 2010 | 1986 Ford F150 SuperCab

1 Answer

Bouncing RPMs


My car would do the same thing turned ot to be a loose wire at the coil/distributor. there is a plug connector with tow wires one wass loose I crimped the wire no works great

May 04, 2009 | 1985 Pontiac Fiero

1 Answer

Cold days 94 f-150 high rpm start


probably is a emissions sensor problem, lots of these parts are plastic. check out the throttle cables, lub em wd40. there is a type of valve somewhere on top of engine, it may be cracked, pcv valve stuck. lots of possibilities, almost too much for solution online. something emmissions with an electronic sensor is acting up.

Feb 25, 2009 | Ford F-150 Cars & Trucks

1 Answer

When I start the engine from cold it runs on high revs too long


Hi ..... This sounds as if it's fitted with an automatic choke, as long as the revs drop when it's warm there is nothing to worry about. The indication when these start to go wrong is that the car won't start when cold ................ even then any decent mechanic can fit a normal/manual choke.

Jan 03, 2009 | 2004 Hyundai Santa Fe

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

479 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts

yadayada
yadayada

Level 3 Expert

75744 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22114 Answers

fordexpert

Level 3 Expert

5495 Answers

Are you a Ford Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...