Check Eng Light On, No Failure Codes

I have a 95 Explorer with133k miles. The check engine light is on most of
the time. The Accutron code checker shows no faults. I have done the
"wiggle" test and wiggled all connectors and no faults are indicated. The
car runs fine, the mileage is normal, plugs were replaced at 111k miles just
because I thought it was about time. I have replaced the gasket on the gas
cap and the PCV valve as items that may cause a fault that is not listed in
the book. I have not done a fuel pressure check. Every once in a while the
engine may hesitate when taking off from a stop, that is the only thing that
the car is doing wrong. Any ideas?

"cadshop" > wrote in message
. ..
> I have a 95 Explorer with133k miles. The check engine light is on most of
> the time. The Accutron code checker shows no faults. I have done the
> "wiggle" test and wiggled all connectors and no faults are indicated. The
> car runs fine, the mileage is normal, plugs were replaced at 111k miles
just
> because I thought it was about time. I have replaced the gasket on the gas
> cap and the PCV valve as items that may cause a fault that is not listed
in
> the book. I have not done a fuel pressure check. Every once in a while the
> engine may hesitate when taking off from a stop, that is the only thing
that
> the car is doing wrong. Any ideas?
>
>
Recently the CEL came on on my '97. I replaced the air filter and cleaned
the throttle body, MAF, and IAC. After three drive cycles the CEL went off
and has not come back on. A dirty IAC might cause some low speed
hesitation. I used carburator cleaner (spray) on mine but brake cleaner
might be safer on the sensors. Be gentle and careful. I don't know if
there is a difference between throttle body cleaner and carburator cleaner
but I've used both with success on the throttle body.

Thanks for the suggestions I did all of those things today. The light is
still on but I'll give it a couple of days. I had also used a propane torch
to direct propane around the manifold and various vacum connections and
never noticed any engine speed changes. This weekend I was out of town and
the car sat outside in below freezing weather. The check engine light seldom
came on in the cold temps. Normally the light comes on about 4 seconds after
starting the engine making me believe that the computer did a check and
found a fault. If I do an immediate scan I only get a code 116 for too low
of coolant temperature. However the scan clears the light and it does not
come on again until I restart the engine. Interesting. I'm glad my smog
check is not due for awhile so there is no real rush to get the problem
fixed.

"Ulysses" /> wrote in message
...
>
> "cadshop" > wrote in message
> . ..
>> I have a 95 Explorer with133k miles. The check engine light is on most of
>> the time. The Accutron code checker shows no faults. I have done the
>> "wiggle" test and wiggled all connectors and no faults are indicated. The
>> car runs fine, the mileage is normal, plugs were replaced at 111k miles
> just
>> because I thought it was about time. I have replaced the gasket on the
>> gas
>> cap and the PCV valve as items that may cause a fault that is not listed
> in
>> the book. I have not done a fuel pressure check. Every once in a while
>> the
>> engine may hesitate when taking off from a stop, that is the only thing
> that
>> the car is doing wrong. Any ideas?
>>
>>
> Recently the CEL came on on my '97. I replaced the air filter and cleaned
> the throttle body, MAF, and IAC. After three drive cycles the CEL went
> off
> and has not come back on. A dirty IAC might cause some low speed
> hesitation. I used carburator cleaner (spray) on mine but brake cleaner
> might be safer on the sensors. Be gentle and careful. I don't know if
> there is a difference between throttle body cleaner and carburator cleaner
> but I've used both with success on the throttle body.
>
>

Yes, several times in the last 2 months. Only one time did I get any codes
and that was a 214 and 538. I unplugged and reconnected the connectors to
the Ignition Control Module, PCM and crank sensor. I have never seen the
codes again.

"Ulysses" /> wrote in message
...
>
> "cadshop" > wrote in message
> . ..
>> Thanks for the suggestions I did all of those things today. The light is
>> still on but I'll give it a couple of days. I had also used a propane
> torch
>> to direct propane around the manifold and various vacum connections and
>> never noticed any engine speed changes. This weekend I was out of town
>> and
>> the car sat outside in below freezing weather. The check engine light
> seldom
>> came on in the cold temps. Normally the light comes on about 4 seconds
> after
>> starting the engine making me believe that the computer did a check and
>> found a fault. If I do an immediate scan I only get a code 116 for too
>> low
>> of coolant temperature. However the scan clears the light and it does not
>> come on again until I restart the engine. Interesting. I'm glad my smog
>> check is not due for awhile so there is no real rush to get the problem
>> fixed.
>
> Since you said you didn't get any codes on your scanner I have to ask: did
> you run it with the engine off AND running?
>
>
>>
>> "Ulysses" /> wrote in message
>> ...
>> >
>> > "cadshop" > wrote in message
>> > . ..
>> >> I have a 95 Explorer with133k miles. The check engine light is on most
> of
>> >> the time. The Accutron code checker shows no faults. I have done the
>> >> "wiggle" test and wiggled all connectors and no faults are indicated.
> The
>> >> car runs fine, the mileage is normal, plugs were replaced at 111k
>> >> miles
>> > just
>> >> because I thought it was about time. I have replaced the gasket on the
>> >> gas
>> >> cap and the PCV valve as items that may cause a fault that is not
> listed
>> > in
>> >> the book. I have not done a fuel pressure check. Every once in a while
>> >> the
>> >> engine may hesitate when taking off from a stop, that is the only
>> >> thing
>> > that
>> >> the car is doing wrong. Any ideas?
>> >>
>> >>
>> > Recently the CEL came on on my '97. I replaced the air filter and
> cleaned
>> > the throttle body, MAF, and IAC. After three drive cycles the CEL went
>> > off
>> > and has not come back on. A dirty IAC might cause some low speed
>> > hesitation. I used carburator cleaner (spray) on mine but brake
>> > cleaner
>> > might be safer on the sensors. Be gentle and careful. I don't know if
>> > there is a difference between throttle body cleaner and carburator
> cleaner
>> > but I've used both with success on the throttle body.
>> >
>> >
>>
>>
>
>

"cadshop" > wrote in message
. ..
> Thanks for the suggestions I did all of those things today. The light is
> still on but I'll give it a couple of days. I had also used a propane
torch
> to direct propane around the manifold and various vacum connections and
> never noticed any engine speed changes. This weekend I was out of town and
> the car sat outside in below freezing weather. The check engine light
seldom
> came on in the cold temps. Normally the light comes on about 4 seconds
after
> starting the engine making me believe that the computer did a check and
> found a fault. If I do an immediate scan I only get a code 116 for too low
> of coolant temperature. However the scan clears the light and it does not
> come on again until I restart the engine. Interesting. I'm glad my smog
> check is not due for awhile so there is no real rush to get the problem
> fixed.

Since you said you didn't get any codes on your scanner I have to ask: did
you run it with the engine off AND running?


>
> "Ulysses" /> wrote in message
> ...
> >
> > "cadshop" > wrote in message
> > . ..
> >> I have a 95 Explorer with133k miles. The check engine light is on most
of
> >> the time. The Accutron code checker shows no faults. I have done the
> >> "wiggle" test and wiggled all connectors and no faults are indicated.
The
> >> car runs fine, the mileage is normal, plugs were replaced at 111k miles
> > just
> >> because I thought it was about time. I have replaced the gasket on the
> >> gas
> >> cap and the PCV valve as items that may cause a fault that is not
listed
> > in
> >> the book. I have not done a fuel pressure check. Every once in a while
> >> the
> >> engine may hesitate when taking off from a stop, that is the only thing
> > that
> >> the car is doing wrong. Any ideas?
> >>
> >>
> > Recently the CEL came on on my '97. I replaced the air filter and
cleaned
> > the throttle body, MAF, and IAC. After three drive cycles the CEL went
> > off
> > and has not come back on. A dirty IAC might cause some low speed
> > hesitation. I used carburator cleaner (spray) on mine but brake cleaner
> > might be safer on the sensors. Be gentle and careful. I don't know if
> > there is a difference between throttle body cleaner and carburator
cleaner
> > but I've used both with success on the throttle body.
> >
> >
>
>