Question about 1994 Ford Explorer Limited

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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???

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It possibly is a faulty throttle poisition sensor

Posted on Dec 07, 2008

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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.

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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

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Cold Air in highway


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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?

especially?
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)

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1993 Ford explorer.Began idling rough and surging


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Check your IAC (Idle Air Control) valve on the side of the intake. These get carbon fouled and tend to stick causing high rpm for extended times. Also the EGR valve should be checked (under the intake) as it will cause rough idle or stalling near idle.

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let me know in a few days if this helps.

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