2.5L backfires
08-14-2005, 12:58 AM
#1
Guest
Posts: n/a
2.5L backfires
The 2.5L in my 89 YJ has been backfiring for a while. When cold, it idles
smooth and runs fine. When hot the idle can drop as low as about 5-600rpms,
but sometimes is smooth. Sometimes it will backfire on deceleration. This is
only usually if you downshift to slow down. The backfiring is pretty bad,
sounds like a gunshot. There is a hesitation off idle. Typically, the rpms
will drop before rising when I press the gas pedal. This is all pretty much
when the engine is warm. It's not over heating. I used to smell gas fumes
when it was cold. Lastly, the tail pipe is pretty black on the inside.
Where do I even start?
Carl
smooth and runs fine. When hot the idle can drop as low as about 5-600rpms,
but sometimes is smooth. Sometimes it will backfire on deceleration. This is
only usually if you downshift to slow down. The backfiring is pretty bad,
sounds like a gunshot. There is a hesitation off idle. Typically, the rpms
will drop before rising when I press the gas pedal. This is all pretty much
when the engine is warm. It's not over heating. I used to smell gas fumes
when it was cold. Lastly, the tail pipe is pretty black on the inside.
Where do I even start?
Carl
08-14-2005, 01:09 AM
#2
Guest
Posts: n/a
Re: 2.5L backfires
Sounds like it is runninig too rich. You are gettiing too much fuel, not
enough air. Turn in the adjustment screws 1/4 - 1/2 a turn and see if it
runs better. Is the air filter in good shape?
"Carl Saiyed" <carlsaiyed@REMOVEhotmail.com> wrote in message
news:42fecfb6$1_5@newsfeed.slurp.net...
> The 2.5L in my 89 YJ has been backfiring for a while. When cold, it idles
> smooth and runs fine. When hot the idle can drop as low as about
> 5-600rpms,
> but sometimes is smooth. Sometimes it will backfire on deceleration. This
> is
> only usually if you downshift to slow down. The backfiring is pretty bad,
> sounds like a gunshot. There is a hesitation off idle. Typically, the rpms
> will drop before rising when I press the gas pedal. This is all pretty
> much
> when the engine is warm. It's not over heating. I used to smell gas fumes
> when it was cold. Lastly, the tail pipe is pretty black on the inside.
>
> Where do I even start?
>
> Carl
>
>
enough air. Turn in the adjustment screws 1/4 - 1/2 a turn and see if it
runs better. Is the air filter in good shape?
"Carl Saiyed" <carlsaiyed@REMOVEhotmail.com> wrote in message
news:42fecfb6$1_5@newsfeed.slurp.net...
> The 2.5L in my 89 YJ has been backfiring for a while. When cold, it idles
> smooth and runs fine. When hot the idle can drop as low as about
> 5-600rpms,
> but sometimes is smooth. Sometimes it will backfire on deceleration. This
> is
> only usually if you downshift to slow down. The backfiring is pretty bad,
> sounds like a gunshot. There is a hesitation off idle. Typically, the rpms
> will drop before rising when I press the gas pedal. This is all pretty
> much
> when the engine is warm. It's not over heating. I used to smell gas fumes
> when it was cold. Lastly, the tail pipe is pretty black on the inside.
>
> Where do I even start?
>
> Carl
>
>
08-14-2005, 01:09 AM
#3
Guest
Posts: n/a
Re: 2.5L backfires
Sounds like it is runninig too rich. You are gettiing too much fuel, not
enough air. Turn in the adjustment screws 1/4 - 1/2 a turn and see if it
runs better. Is the air filter in good shape?
"Carl Saiyed" <carlsaiyed@REMOVEhotmail.com> wrote in message
news:42fecfb6$1_5@newsfeed.slurp.net...
> The 2.5L in my 89 YJ has been backfiring for a while. When cold, it idles
> smooth and runs fine. When hot the idle can drop as low as about
> 5-600rpms,
> but sometimes is smooth. Sometimes it will backfire on deceleration. This
> is
> only usually if you downshift to slow down. The backfiring is pretty bad,
> sounds like a gunshot. There is a hesitation off idle. Typically, the rpms
> will drop before rising when I press the gas pedal. This is all pretty
> much
> when the engine is warm. It's not over heating. I used to smell gas fumes
> when it was cold. Lastly, the tail pipe is pretty black on the inside.
>
> Where do I even start?
>
> Carl
>
>
enough air. Turn in the adjustment screws 1/4 - 1/2 a turn and see if it
runs better. Is the air filter in good shape?
"Carl Saiyed" <carlsaiyed@REMOVEhotmail.com> wrote in message
news:42fecfb6$1_5@newsfeed.slurp.net...
> The 2.5L in my 89 YJ has been backfiring for a while. When cold, it idles
> smooth and runs fine. When hot the idle can drop as low as about
> 5-600rpms,
> but sometimes is smooth. Sometimes it will backfire on deceleration. This
> is
> only usually if you downshift to slow down. The backfiring is pretty bad,
> sounds like a gunshot. There is a hesitation off idle. Typically, the rpms
> will drop before rising when I press the gas pedal. This is all pretty
> much
> when the engine is warm. It's not over heating. I used to smell gas fumes
> when it was cold. Lastly, the tail pipe is pretty black on the inside.
>
> Where do I even start?
>
> Carl
>
>
08-14-2005, 01:09 AM
#4
Guest
Posts: n/a
Re: 2.5L backfires
Sounds like it is runninig too rich. You are gettiing too much fuel, not
enough air. Turn in the adjustment screws 1/4 - 1/2 a turn and see if it
runs better. Is the air filter in good shape?
"Carl Saiyed" <carlsaiyed@REMOVEhotmail.com> wrote in message
news:42fecfb6$1_5@newsfeed.slurp.net...
> The 2.5L in my 89 YJ has been backfiring for a while. When cold, it idles
> smooth and runs fine. When hot the idle can drop as low as about
> 5-600rpms,
> but sometimes is smooth. Sometimes it will backfire on deceleration. This
> is
> only usually if you downshift to slow down. The backfiring is pretty bad,
> sounds like a gunshot. There is a hesitation off idle. Typically, the rpms
> will drop before rising when I press the gas pedal. This is all pretty
> much
> when the engine is warm. It's not over heating. I used to smell gas fumes
> when it was cold. Lastly, the tail pipe is pretty black on the inside.
>
> Where do I even start?
>
> Carl
>
>
enough air. Turn in the adjustment screws 1/4 - 1/2 a turn and see if it
runs better. Is the air filter in good shape?
"Carl Saiyed" <carlsaiyed@REMOVEhotmail.com> wrote in message
news:42fecfb6$1_5@newsfeed.slurp.net...
> The 2.5L in my 89 YJ has been backfiring for a while. When cold, it idles
> smooth and runs fine. When hot the idle can drop as low as about
> 5-600rpms,
> but sometimes is smooth. Sometimes it will backfire on deceleration. This
> is
> only usually if you downshift to slow down. The backfiring is pretty bad,
> sounds like a gunshot. There is a hesitation off idle. Typically, the rpms
> will drop before rising when I press the gas pedal. This is all pretty
> much
> when the engine is warm. It's not over heating. I used to smell gas fumes
> when it was cold. Lastly, the tail pipe is pretty black on the inside.
>
> Where do I even start?
>
> Carl
>
>
08-14-2005, 01:09 AM
#5
Guest
Posts: n/a
Re: 2.5L backfires
Sounds like it is runninig too rich. You are gettiing too much fuel, not
enough air. Turn in the adjustment screws 1/4 - 1/2 a turn and see if it
runs better. Is the air filter in good shape?
"Carl Saiyed" <carlsaiyed@REMOVEhotmail.com> wrote in message
news:42fecfb6$1_5@newsfeed.slurp.net...
> The 2.5L in my 89 YJ has been backfiring for a while. When cold, it idles
> smooth and runs fine. When hot the idle can drop as low as about
> 5-600rpms,
> but sometimes is smooth. Sometimes it will backfire on deceleration. This
> is
> only usually if you downshift to slow down. The backfiring is pretty bad,
> sounds like a gunshot. There is a hesitation off idle. Typically, the rpms
> will drop before rising when I press the gas pedal. This is all pretty
> much
> when the engine is warm. It's not over heating. I used to smell gas fumes
> when it was cold. Lastly, the tail pipe is pretty black on the inside.
>
> Where do I even start?
>
> Carl
>
>
enough air. Turn in the adjustment screws 1/4 - 1/2 a turn and see if it
runs better. Is the air filter in good shape?
"Carl Saiyed" <carlsaiyed@REMOVEhotmail.com> wrote in message
news:42fecfb6$1_5@newsfeed.slurp.net...
> The 2.5L in my 89 YJ has been backfiring for a while. When cold, it idles
> smooth and runs fine. When hot the idle can drop as low as about
> 5-600rpms,
> but sometimes is smooth. Sometimes it will backfire on deceleration. This
> is
> only usually if you downshift to slow down. The backfiring is pretty bad,
> sounds like a gunshot. There is a hesitation off idle. Typically, the rpms
> will drop before rising when I press the gas pedal. This is all pretty
> much
> when the engine is warm. It's not over heating. I used to smell gas fumes
> when it was cold. Lastly, the tail pipe is pretty black on the inside.
>
> Where do I even start?
>
> Carl
>
>
08-14-2005, 01:26 AM
#6
Guest
Posts: n/a
Re: 2.5L backfires
Air filter is new, new plugs, distrib. cap, rotator, cleaned the throttle
body. I thought the mixture was computer controlled, as this is a fuel
injected vehicle. Is there an adjustment?
Carl
"Rusted" <no@email.com> wrote in message
news:fmALe.64749$n51.15179@fe14.usenetserver.com.. .
> Sounds like it is runninig too rich. You are gettiing too much fuel, not
> enough air. Turn in the adjustment screws 1/4 - 1/2 a turn and see if it
> runs better. Is the air filter in good shape?
>
>
> "Carl Saiyed" <carlsaiyed@REMOVEhotmail.com> wrote in message
> news:42fecfb6$1_5@newsfeed.slurp.net...
> > The 2.5L in my 89 YJ has been backfiring for a while. When cold, it
idles
> > smooth and runs fine. When hot the idle can drop as low as about
> > 5-600rpms,
> > but sometimes is smooth. Sometimes it will backfire on deceleration.
This
> > is
> > only usually if you downshift to slow down. The backfiring is pretty
bad,
> > sounds like a gunshot. There is a hesitation off idle. Typically, the
rpms
> > will drop before rising when I press the gas pedal. This is all pretty
> > much
> > when the engine is warm. It's not over heating. I used to smell gas
fumes
> > when it was cold. Lastly, the tail pipe is pretty black on the inside.
> >
> > Where do I even start?
> >
> > Carl
> >
> >
>
>
>
body. I thought the mixture was computer controlled, as this is a fuel
injected vehicle. Is there an adjustment?
Carl
"Rusted" <no@email.com> wrote in message
news:fmALe.64749$n51.15179@fe14.usenetserver.com.. .
> Sounds like it is runninig too rich. You are gettiing too much fuel, not
> enough air. Turn in the adjustment screws 1/4 - 1/2 a turn and see if it
> runs better. Is the air filter in good shape?
>
>
> "Carl Saiyed" <carlsaiyed@REMOVEhotmail.com> wrote in message
> news:42fecfb6$1_5@newsfeed.slurp.net...
> > The 2.5L in my 89 YJ has been backfiring for a while. When cold, it
idles
> > smooth and runs fine. When hot the idle can drop as low as about
> > 5-600rpms,
> > but sometimes is smooth. Sometimes it will backfire on deceleration.
This
> > is
> > only usually if you downshift to slow down. The backfiring is pretty
bad,
> > sounds like a gunshot. There is a hesitation off idle. Typically, the
rpms
> > will drop before rising when I press the gas pedal. This is all pretty
> > much
> > when the engine is warm. It's not over heating. I used to smell gas
fumes
> > when it was cold. Lastly, the tail pipe is pretty black on the inside.
> >
> > Where do I even start?
> >
> > Carl
> >
> >
>
>
>
08-14-2005, 01:26 AM
#7
Guest
Posts: n/a
Re: 2.5L backfires
Air filter is new, new plugs, distrib. cap, rotator, cleaned the throttle
body. I thought the mixture was computer controlled, as this is a fuel
injected vehicle. Is there an adjustment?
Carl
"Rusted" <no@email.com> wrote in message
news:fmALe.64749$n51.15179@fe14.usenetserver.com.. .
> Sounds like it is runninig too rich. You are gettiing too much fuel, not
> enough air. Turn in the adjustment screws 1/4 - 1/2 a turn and see if it
> runs better. Is the air filter in good shape?
>
>
> "Carl Saiyed" <carlsaiyed@REMOVEhotmail.com> wrote in message
> news:42fecfb6$1_5@newsfeed.slurp.net...
> > The 2.5L in my 89 YJ has been backfiring for a while. When cold, it
idles
> > smooth and runs fine. When hot the idle can drop as low as about
> > 5-600rpms,
> > but sometimes is smooth. Sometimes it will backfire on deceleration.
This
> > is
> > only usually if you downshift to slow down. The backfiring is pretty
bad,
> > sounds like a gunshot. There is a hesitation off idle. Typically, the
rpms
> > will drop before rising when I press the gas pedal. This is all pretty
> > much
> > when the engine is warm. It's not over heating. I used to smell gas
fumes
> > when it was cold. Lastly, the tail pipe is pretty black on the inside.
> >
> > Where do I even start?
> >
> > Carl
> >
> >
>
>
>
body. I thought the mixture was computer controlled, as this is a fuel
injected vehicle. Is there an adjustment?
Carl
"Rusted" <no@email.com> wrote in message
news:fmALe.64749$n51.15179@fe14.usenetserver.com.. .
> Sounds like it is runninig too rich. You are gettiing too much fuel, not
> enough air. Turn in the adjustment screws 1/4 - 1/2 a turn and see if it
> runs better. Is the air filter in good shape?
>
>
> "Carl Saiyed" <carlsaiyed@REMOVEhotmail.com> wrote in message
> news:42fecfb6$1_5@newsfeed.slurp.net...
> > The 2.5L in my 89 YJ has been backfiring for a while. When cold, it
idles
> > smooth and runs fine. When hot the idle can drop as low as about
> > 5-600rpms,
> > but sometimes is smooth. Sometimes it will backfire on deceleration.
This
> > is
> > only usually if you downshift to slow down. The backfiring is pretty
bad,
> > sounds like a gunshot. There is a hesitation off idle. Typically, the
rpms
> > will drop before rising when I press the gas pedal. This is all pretty
> > much
> > when the engine is warm. It's not over heating. I used to smell gas
fumes
> > when it was cold. Lastly, the tail pipe is pretty black on the inside.
> >
> > Where do I even start?
> >
> > Carl
> >
> >
>
>
>
08-14-2005, 01:26 AM
#8
Guest
Posts: n/a
Re: 2.5L backfires
Air filter is new, new plugs, distrib. cap, rotator, cleaned the throttle
body. I thought the mixture was computer controlled, as this is a fuel
injected vehicle. Is there an adjustment?
Carl
"Rusted" <no@email.com> wrote in message
news:fmALe.64749$n51.15179@fe14.usenetserver.com.. .
> Sounds like it is runninig too rich. You are gettiing too much fuel, not
> enough air. Turn in the adjustment screws 1/4 - 1/2 a turn and see if it
> runs better. Is the air filter in good shape?
>
>
> "Carl Saiyed" <carlsaiyed@REMOVEhotmail.com> wrote in message
> news:42fecfb6$1_5@newsfeed.slurp.net...
> > The 2.5L in my 89 YJ has been backfiring for a while. When cold, it
idles
> > smooth and runs fine. When hot the idle can drop as low as about
> > 5-600rpms,
> > but sometimes is smooth. Sometimes it will backfire on deceleration.
This
> > is
> > only usually if you downshift to slow down. The backfiring is pretty
bad,
> > sounds like a gunshot. There is a hesitation off idle. Typically, the
rpms
> > will drop before rising when I press the gas pedal. This is all pretty
> > much
> > when the engine is warm. It's not over heating. I used to smell gas
fumes
> > when it was cold. Lastly, the tail pipe is pretty black on the inside.
> >
> > Where do I even start?
> >
> > Carl
> >
> >
>
>
>
body. I thought the mixture was computer controlled, as this is a fuel
injected vehicle. Is there an adjustment?
Carl
"Rusted" <no@email.com> wrote in message
news:fmALe.64749$n51.15179@fe14.usenetserver.com.. .
> Sounds like it is runninig too rich. You are gettiing too much fuel, not
> enough air. Turn in the adjustment screws 1/4 - 1/2 a turn and see if it
> runs better. Is the air filter in good shape?
>
>
> "Carl Saiyed" <carlsaiyed@REMOVEhotmail.com> wrote in message
> news:42fecfb6$1_5@newsfeed.slurp.net...
> > The 2.5L in my 89 YJ has been backfiring for a while. When cold, it
idles
> > smooth and runs fine. When hot the idle can drop as low as about
> > 5-600rpms,
> > but sometimes is smooth. Sometimes it will backfire on deceleration.
This
> > is
> > only usually if you downshift to slow down. The backfiring is pretty
bad,
> > sounds like a gunshot. There is a hesitation off idle. Typically, the
rpms
> > will drop before rising when I press the gas pedal. This is all pretty
> > much
> > when the engine is warm. It's not over heating. I used to smell gas
fumes
> > when it was cold. Lastly, the tail pipe is pretty black on the inside.
> >
> > Where do I even start?
> >
> > Carl
> >
> >
>
>
>
08-14-2005, 01:26 AM
#9
Guest
Posts: n/a
Re: 2.5L backfires
Air filter is new, new plugs, distrib. cap, rotator, cleaned the throttle
body. I thought the mixture was computer controlled, as this is a fuel
injected vehicle. Is there an adjustment?
Carl
"Rusted" <no@email.com> wrote in message
news:fmALe.64749$n51.15179@fe14.usenetserver.com.. .
> Sounds like it is runninig too rich. You are gettiing too much fuel, not
> enough air. Turn in the adjustment screws 1/4 - 1/2 a turn and see if it
> runs better. Is the air filter in good shape?
>
>
> "Carl Saiyed" <carlsaiyed@REMOVEhotmail.com> wrote in message
> news:42fecfb6$1_5@newsfeed.slurp.net...
> > The 2.5L in my 89 YJ has been backfiring for a while. When cold, it
idles
> > smooth and runs fine. When hot the idle can drop as low as about
> > 5-600rpms,
> > but sometimes is smooth. Sometimes it will backfire on deceleration.
This
> > is
> > only usually if you downshift to slow down. The backfiring is pretty
bad,
> > sounds like a gunshot. There is a hesitation off idle. Typically, the
rpms
> > will drop before rising when I press the gas pedal. This is all pretty
> > much
> > when the engine is warm. It's not over heating. I used to smell gas
fumes
> > when it was cold. Lastly, the tail pipe is pretty black on the inside.
> >
> > Where do I even start?
> >
> > Carl
> >
> >
>
>
>
body. I thought the mixture was computer controlled, as this is a fuel
injected vehicle. Is there an adjustment?
Carl
"Rusted" <no@email.com> wrote in message
news:fmALe.64749$n51.15179@fe14.usenetserver.com.. .
> Sounds like it is runninig too rich. You are gettiing too much fuel, not
> enough air. Turn in the adjustment screws 1/4 - 1/2 a turn and see if it
> runs better. Is the air filter in good shape?
>
>
> "Carl Saiyed" <carlsaiyed@REMOVEhotmail.com> wrote in message
> news:42fecfb6$1_5@newsfeed.slurp.net...
> > The 2.5L in my 89 YJ has been backfiring for a while. When cold, it
idles
> > smooth and runs fine. When hot the idle can drop as low as about
> > 5-600rpms,
> > but sometimes is smooth. Sometimes it will backfire on deceleration.
This
> > is
> > only usually if you downshift to slow down. The backfiring is pretty
bad,
> > sounds like a gunshot. There is a hesitation off idle. Typically, the
rpms
> > will drop before rising when I press the gas pedal. This is all pretty
> > much
> > when the engine is warm. It's not over heating. I used to smell gas
fumes
> > when it was cold. Lastly, the tail pipe is pretty black on the inside.
> >
> > Where do I even start?
> >
> > Carl
> >
> >
>
>
>
08-14-2005, 01:54 AM
#10
Guest
Posts: n/a
Re: 2.5L backfires
Fix the leak in your exhaust headers.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Carl Saiyed wrote:
>
> The 2.5L in my 89 YJ has been backfiring for a while. When cold, it idles
> smooth and runs fine. When hot the idle can drop as low as about 5-600rpms,
> but sometimes is smooth. Sometimes it will backfire on deceleration. This is
> only usually if you downshift to slow down. The backfiring is pretty bad,
> sounds like a gunshot. There is a hesitation off idle. Typically, the rpms
> will drop before rising when I press the gas pedal. This is all pretty much
> when the engine is warm. It's not over heating. I used to smell gas fumes
> when it was cold. Lastly, the tail pipe is pretty black on the inside.
>
> Where do I even start?
>
> Carl
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Carl Saiyed wrote:
>
> The 2.5L in my 89 YJ has been backfiring for a while. When cold, it idles
> smooth and runs fine. When hot the idle can drop as low as about 5-600rpms,
> but sometimes is smooth. Sometimes it will backfire on deceleration. This is
> only usually if you downshift to slow down. The backfiring is pretty bad,
> sounds like a gunshot. There is a hesitation off idle. Typically, the rpms
> will drop before rising when I press the gas pedal. This is all pretty much
> when the engine is warm. It's not over heating. I used to smell gas fumes
> when it was cold. Lastly, the tail pipe is pretty black on the inside.
>
> Where do I even start?
>
> Carl