'87 2.5 4 cyl backfire

I'm havin trouble. My fiero was sittin for a few months and recently I put
it back on the road. Anyways, It was driving fine, but now it's backfiring
during acceleration. I've checked the plug wires, O2 sensor, EGR, but I
really don't have a clue what's goin on. It runs fine under high RPM
driving, but if I go to punch it it starts to backfire and as is it's
missing or something. It's backfiring out of the carb too. Anyone have any
clue what's goin on?

Well The problem isn't fixed. I re checked all the vacuum hoses and stuff,
and they're alright...... I can't figure it out.

Maybe a coil pack? I dunno. Anyone have any clue?


"Chris B" <cbabchuk@globallivingspace.com> wrote in message
news:U_YMc.110797$od7.101798@pd7tw3no...
> I'm havin trouble. My fiero was sittin for a few months and recently I
put
> it back on the road. Anyways, It was driving fine, but now it's
backfiring
> during acceleration. I've checked the plug wires, O2 sensor, EGR, but I
> really don't have a clue what's goin on. It runs fine under high RPM
> driving, but if I go to punch it it starts to backfire and as is it's
> missing or something. It's backfiring out of the carb too. Anyone have
any
> clue what's goin on?
>
>

I had a similar problem with my SC3800 (also has a DIS ignition), in my
case is turned out to be a flaky ign module. It would accelerate fine
when cold but as soon as it warmed up I could cruise at speed but if I
accelerated too quickly it would miss and backfire.

Chris B wrote:
> Well The problem isn't fixed. I re checked all the vacuum hoses and stuff,
> and they're alright...... I can't figure it out.
>
> Maybe a coil pack? I dunno. Anyone have any clue?
>
>
> "Chris B" <cbabchuk@globallivingspace.com> wrote in message
> news:U_YMc.110797$od7.101798@pd7tw3no...
>
>>I'm havin trouble. My fiero was sittin for a few months and recently I
>
> put
>
>>it back on the road. Anyways, It was driving fine, but now it's
>
> backfiring
>
>>during acceleration. I've checked the plug wires, O2 sensor, EGR, but I
>>really don't have a clue what's goin on. It runs fine under high RPM
>>driving, but if I go to punch it it starts to backfire and as is it's
>>missing or something. It's backfiring out of the carb too. Anyone have
>
> any
>
>>clue what's goin on?
>>
>>
>
>
>
>

Check the Crank Position Sensor:

In fact, take out the module and coils, for the price of the CPS, and the
amount of times they go bad. It's worth just replacing it. While you have it
apart, then check your coils as per manual directions, I don't remember and
do this all the time. Plus, it would take two pages to type it all in.

My bet would be the Crank Position Sensor, especially if it wicked out any
oil when you remove it from the module. Then you might want to consider
swapping the module too.

Refinish King


"Chris B" <cbabchuk@globallivingspace.com> wrote in message
news:99CNc.124834$od7.49243@pd7tw3no...
> Well The problem isn't fixed. I re checked all the vacuum hoses and
stuff,
> and they're alright...... I can't figure it out.
>
> Maybe a coil pack? I dunno. Anyone have any clue?
>
>
> "Chris B" <cbabchuk@globallivingspace.com> wrote in message
> news:U_YMc.110797$od7.101798@pd7tw3no...
> > I'm havin trouble. My fiero was sittin for a few months and recently I
> put
> > it back on the road. Anyways, It was driving fine, but now it's
> backfiring
> > during acceleration. I've checked the plug wires, O2 sensor, EGR, but I
> > really don't have a clue what's goin on. It runs fine under high RPM
> > driving, but if I go to punch it it starts to backfire and as is it's
> > missing or something. It's backfiring out of the carb too. Anyone have
> any
> > clue what's goin on?
> >
> >
>
>