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Revving/stalling/surging issue on a 1997 XLT 4.0L.

3Dee

Member
Joined
May 15, 2020
Messages
19
Reaction score
5
City, State
Guernsey
Year, Model & Trim Level
1994 Ford Explorer XLT
Hello all, hoping someone might have some helpful information about what's going on with my Aerostar.
20190706_204704.jpg

Ever since I bought it in 2019, Its had an issue. Not the biggest one, but it has been very annoying.

The idle of the van is constantly fluctuating, revving over and over, with small periods of high (but smooth) idle. The main problem with this is: when slowing to a stop, if not done very very smoothly, the van will do the revving over and over, and most times stalls the entire vehicle, requiring a switch to Park, and a restart of the van. Other than this, the van has given me no other problems, and to this day is the best $500 I've ever spent.

Things I've Tried:
Replaced O2 Sensor (Front and Back)
 


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BrooklynBay

Moderator & long time member.
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City, State
Brooklyn, NY
Year, Model & Trim Level
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Check the TPS for dead spots with an Ohmmeter, clean the idle air control valve (Ford calls it the air bypass valve) the snap on filter on that solenoid valve, check the vacuum hoses for leaks, clean the throttle body, and the mass air flow sensor. The throttle body & MAF sensor use different sprays. Are you getting any codes such as P0171-P0174? That could be related to leaking manifold gasket seals.
 




zenish

Well-Known Member
Joined
June 6, 2014
Messages
176
Reaction score
11
City, State
charlotte nc
Year, Model & Trim Level
1991 aerostar xlt
my 4.0 van does this too.i always shift to neutral coming to a stop.the check engine light is on sometimes.
 












zenish

Well-Known Member
Joined
June 6, 2014
Messages
176
Reaction score
11
City, State
charlotte nc
Year, Model & Trim Level
1991 aerostar xlt
i still haven't had time.its progressed to having to hold the gas pedal down slightly while stopping.
the code reader says right oxygen sensor quit switching though it only seems to have one.its running MUCH worse now.new sensor arriving from rock auto thursday.
 




zenish

Well-Known Member
Joined
June 6, 2014
Messages
176
Reaction score
11
City, State
charlotte nc
Year, Model & Trim Level
1991 aerostar xlt
the code reader says right oxygen sensor quit switching though it only seems to have one.its running MUCH worse now.new sensor arriving from rock auto thursday.
and now code 14.and code 41 still.
 




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