Question about 1994 Ford Explorer Limited

1 Answer

Power surges at highway speeds

My 1994 explorer surges at high rpm?! i took it for an air care test(test the emissions) which they need to drive on a dyno at different speeds and once they got up to a highway passing speed the vehicle surged an they couldn't maintain the speed so the test was cancelled!? i need to pass this air care test in order to keep my insurance!!! so i need to know what could be the problem???

Posted by on


1 Answer

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 3 Answers

It possibly is a faulty throttle poisition sensor

Posted on Dec 07, 2008


1 Suggested Answer

  • 2 Answers

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

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.
Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


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



Related Questions:

1 Answer

What is the drive cycle for a 1998 dodge stratus that showed incomplete on emission test?

On most models, you need to drive 100 miles after the engine reaches operating temp. The drive needs to include both highway and city travel at various speeds.

Oct 16, 2014 | 1998 Dodge Stratus

1 Answer

Troubleshooting engine

Hi Stephen, The problem with the idle speed being to high could be with the cold start up idle motor, located on the throttle body, more especially if the idle speed is erratic with surges of increasing and decreasing speeds. If the idle speed is high and without surging the problem could be a broken or loose fitting vacuum pipes. Check to make sure all are fitting tightly and they are not cracked, broken or loose. Lastly there could be a problem with the intake manifold gasket.Lack of power could be related to the above, or if your vehicle is fitted with a distributer, the ignition timing may require setting. If required, the job must be carried out with a stroboscopic timing light and a bridge connecting T to E1 inside the diagnostic socket (usually located on the fire wall above the gear box side of the engine. Paint a spot a white paint on the timing cover on the TDC mark and another in the notch on the crankshaft pulley, Start the engine and leaving it idling at 650 rpm loosen and adjust the distributer by aiming th timing light at the front pulley, moving the distributer until the painted marks align with one another. Lack of power can also be due to poor service, a clogged fuel or air filter or a fuel pump becoming lazy (Though this is unlikely as they either work or fail) Have the engine cylinder compressions tested.and make sure it is with specifications. Hope this info is some help? Regards John

Jun 24, 2014 | 1994 Toyota Camry

1 Answer

Cold Air in highway

If you haven't, check your cooling liquid to see how full the resovoir is, or maybe the thermostadt is sticking (but I doubt that)

Thanks, Terry

Mar 14, 2014 | BMW Cars & Trucks

1 Answer

Increase then decrease idle when engine is cold especially

cold engine idle surge. (problem)
RPM range of surge not stated
300-700 or 800 to 1500? (range is critical to diagnosis)

bad fuel
running summer fuel in winter (running old fuel?)
needs a tune up bad, see the list in the operator guide.
idle speed controller,sticking or EGR valve same. (clean them)
location not stated, so cant guess about local air temps.?
no other symptoms, lack of engine power? etc?
was it ok last week, or better, when was the last time it was OK?
1week, 1year?
surge , causes, on a tuned engine might be:
1: too lean. so lean the ISC can not control idle. rpm low, stalling
2: too rich, flooding, stalling, spark plugs foul (look at them)
3: weak compression in 1 or more cylinders.
4: bad spark.
5: air leaks, in the plenum causing , ISC to lose control.
why high RPM?

well that means it fails hot too.
and there is a simple tests. for hot surge.
is engine fully hot? 180F and holds solid there?
say rpm is about 800
and you turn on head lights, heater fan and (not AC) and defrost.
the RPM must hold or the ISC is failing.
ISC -= idle speed controls. (all EFI has this function)

Oct 28, 2013 | 1996 Honda Prelude

1 Answer

Vacuum diagram for 98 dodge ram 1500 5.9 liter

The vacuum diagram is under the hood on the federal emission system sticker. We do not have it.

Oct 26, 2012 | 1998 Dodge Ram 1500 4WD

2 Answers

It surges at idle and stumblesunder mild

I want u to clean the air intake valve and idle speed control valve, follow the procedure below.

Here are the common cause of surges, cold stalls, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

let me know in a few days if this helps.

Feb 21, 2010 | 1994 Ford Taurus

1 Answer

'98 S10 4 cyl. 5 speed: Sudden high idle, now surges.

Go to your local shucks or auto zone and they can check any codes behind your check engine light and it's free. It sounds like one of two things a O2 sensor or your mass airflow sensor but they will tell you for sure

Oct 02, 2009 | 1998 Chevrolet S-10 Pickup

2 Answers

RPM surges intermittently from 1000 to 2000 at idle or slow speed

ok a couple of things to try one is loosen the throttle cable so it has a little play in it and then you can check for vacume leaks using carb cleaner if rpms change you have a leak

Aug 17, 2009 | 1994 Honda Accord

Not finding what you are looking for?
1994 Ford Explorer Limited Logo

Related Topics:

347 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts


Level 3 Expert

77932 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22306 Answers


Level 3 Expert

5651 Answers

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

Answer questions

Manuals & User Guides