Weak coil or bad ignition wires or plugs. The back fire is raw gas
via a misfire pushed out into the exhaust for the next cylinder that
fired to ignite.
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

dwd3773@bellsouth.net wrote:
>
> I have a 1991 Wrangler with a 2.5 liter fuel injected engine. I have
> been working on restoring it for a little while but now that I have it
> where I can drive it, I have a problem somewhere. I have no clue what
> or where the problem is. All I know is that when the engine is at an
> idle, it runs very smooth and sounds like a normal engine does. But
> when I try to drive it, it starts to backfire really bad, but as soon
> as I let off the gas it goes right back to that smooth idle. I have
> just about replaced everything in the engine compartment. This problem
> has really hendered my progress on getting my jeep road ready. If
> anyone can help please let me know. Also does anyone know what the fuel
> pressure is supposed to be on this engine?
>
> Thanks
> Derrick

 

Weak coil or bad ignition wires or plugs. The back fire is raw gas
via a misfire pushed out into the exhaust for the next cylinder that
fired to ignite.
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

dwd3773@bellsouth.net wrote:
>
> I have a 1991 Wrangler with a 2.5 liter fuel injected engine. I have
> been working on restoring it for a little while but now that I have it
> where I can drive it, I have a problem somewhere. I have no clue what
> or where the problem is. All I know is that when the engine is at an
> idle, it runs very smooth and sounds like a normal engine does. But
> when I try to drive it, it starts to backfire really bad, but as soon
> as I let off the gas it goes right back to that smooth idle. I have
> just about replaced everything in the engine compartment. This problem
> has really hendered my progress on getting my jeep road ready. If
> anyone can help please let me know. Also does anyone know what the fuel
> pressure is supposed to be on this engine?
>
> Thanks
> Derrick

 

Weak coil or bad ignition wires or plugs. The back fire is raw gas
via a misfire pushed out into the exhaust for the next cylinder that
fired to ignite.
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

dwd3773@bellsouth.net wrote:
>
> I have a 1991 Wrangler with a 2.5 liter fuel injected engine. I have
> been working on restoring it for a little while but now that I have it
> where I can drive it, I have a problem somewhere. I have no clue what
> or where the problem is. All I know is that when the engine is at an
> idle, it runs very smooth and sounds like a normal engine does. But
> when I try to drive it, it starts to backfire really bad, but as soon
> as I let off the gas it goes right back to that smooth idle. I have
> just about replaced everything in the engine compartment. This problem
> has really hendered my progress on getting my jeep road ready. If
> anyone can help please let me know. Also does anyone know what the fuel
> pressure is supposed to be on this engine?
>
> Thanks
> Derrick

 

Thanks for the replys. I was told that on the 2.5L engine, that the
distributor didn't have any adjustments. Also with the distributor,
plug wires, and plugs if something in them was wrong would the engine
idle rough? I will get the fuel pressure checked at the fuel rail, but
I think that the fuel pressure might be the problem. I'm not sure but
wouldn't low fuel pressure also cause the same symptoms? See I had
converted my jeep to a chevy 350 motor, it was running great but I
couldn't get the drive shaft to the correct angle for the type of
transmission I had. Also I wanted to be able to drive my jeep everyday,
and with gas prices the way they are now, I decided to put the stock
engine back in. So if anyone know anybody that wants a complet jeep to
chevy engine conversion kit as well as a complete 350 with transmission
and transfer case I have it. Now back to the problem, How can I find
out if my distributor is turned wrong? and I will change the plug wires
and plugs, and I will look into changing the coil as well, but if
anyone knows anything else to try please let me know.

Thanks

 

Thanks for the replys. I was told that on the 2.5L engine, that the
distributor didn't have any adjustments. Also with the distributor,
plug wires, and plugs if something in them was wrong would the engine
idle rough? I will get the fuel pressure checked at the fuel rail, but
I think that the fuel pressure might be the problem. I'm not sure but
wouldn't low fuel pressure also cause the same symptoms? See I had
converted my jeep to a chevy 350 motor, it was running great but I
couldn't get the drive shaft to the correct angle for the type of
transmission I had. Also I wanted to be able to drive my jeep everyday,
and with gas prices the way they are now, I decided to put the stock
engine back in. So if anyone know anybody that wants a complet jeep to
chevy engine conversion kit as well as a complete 350 with transmission
and transfer case I have it. Now back to the problem, How can I find
out if my distributor is turned wrong? and I will change the plug wires
and plugs, and I will look into changing the coil as well, but if
anyone knows anything else to try please let me know.

Thanks

 

Thanks for the replys. I was told that on the 2.5L engine, that the
distributor didn't have any adjustments. Also with the distributor,
plug wires, and plugs if something in them was wrong would the engine
idle rough? I will get the fuel pressure checked at the fuel rail, but
I think that the fuel pressure might be the problem. I'm not sure but
wouldn't low fuel pressure also cause the same symptoms? See I had
converted my jeep to a chevy 350 motor, it was running great but I
couldn't get the drive shaft to the correct angle for the type of
transmission I had. Also I wanted to be able to drive my jeep everyday,
and with gas prices the way they are now, I decided to put the stock
engine back in. So if anyone know anybody that wants a complet jeep to
chevy engine conversion kit as well as a complete 350 with transmission
and transfer case I have it. Now back to the problem, How can I find
out if my distributor is turned wrong? and I will change the plug wires
and plugs, and I will look into changing the coil as well, but if
anyone knows anything else to try please let me know.

Thanks

 

Thanks for the replys. I was told that on the 2.5L engine, that the
distributor didn't have any adjustments. Also with the distributor,
plug wires, and plugs if something in them was wrong would the engine
idle rough? I will get the fuel pressure checked at the fuel rail, but
I think that the fuel pressure might be the problem. I'm not sure but
wouldn't low fuel pressure also cause the same symptoms? See I had
converted my jeep to a chevy 350 motor, it was running great but I
couldn't get the drive shaft to the correct angle for the type of
transmission I had. Also I wanted to be able to drive my jeep everyday,
and with gas prices the way they are now, I decided to put the stock
engine back in. So if anyone know anybody that wants a complet jeep to
chevy engine conversion kit as well as a complete 350 with transmission
and transfer case I have it. Now back to the problem, How can I find
out if my distributor is turned wrong? and I will change the plug wires
and plugs, and I will look into changing the coil as well, but if
anyone knows anything else to try please let me know.

Thanks

 

No backfiring with low fuel pressure.
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

"dwd3773@bellsouth.net" wrote:
>
> Thanks for the replys. I was told that on the 2.5L engine, that the
> distributor didn't have any adjustments. Also with the distributor,
> plug wires, and plugs if something in them was wrong would the engine
> idle rough? I will get the fuel pressure checked at the fuel rail, but
> I think that the fuel pressure might be the problem. I'm not sure but
> wouldn't low fuel pressure also cause the same symptoms? See I had
> converted my jeep to a chevy 350 motor, it was running great but I
> couldn't get the drive shaft to the correct angle for the type of
> transmission I had. Also I wanted to be able to drive my jeep everyday,
> and with gas prices the way they are now, I decided to put the stock
> engine back in. So if anyone know anybody that wants a complet jeep to
> chevy engine conversion kit as well as a complete 350 with transmission
> and transfer case I have it. Now back to the problem, How can I find
> out if my distributor is turned wrong? and I will change the plug wires
> and plugs, and I will look into changing the coil as well, but if
> anyone knows anything else to try please let me know.
>
> Thanks

 

No backfiring with low fuel pressure.
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

"dwd3773@bellsouth.net" wrote:
>
> Thanks for the replys. I was told that on the 2.5L engine, that the
> distributor didn't have any adjustments. Also with the distributor,
> plug wires, and plugs if something in them was wrong would the engine
> idle rough? I will get the fuel pressure checked at the fuel rail, but
> I think that the fuel pressure might be the problem. I'm not sure but
> wouldn't low fuel pressure also cause the same symptoms? See I had
> converted my jeep to a chevy 350 motor, it was running great but I
> couldn't get the drive shaft to the correct angle for the type of
> transmission I had. Also I wanted to be able to drive my jeep everyday,
> and with gas prices the way they are now, I decided to put the stock
> engine back in. So if anyone know anybody that wants a complet jeep to
> chevy engine conversion kit as well as a complete 350 with transmission
> and transfer case I have it. Now back to the problem, How can I find
> out if my distributor is turned wrong? and I will change the plug wires
> and plugs, and I will look into changing the coil as well, but if
> anyone knows anything else to try please let me know.
>
> Thanks

 

No backfiring with low fuel pressure.
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

"dwd3773@bellsouth.net" wrote:
>
> Thanks for the replys. I was told that on the 2.5L engine, that the
> distributor didn't have any adjustments. Also with the distributor,
> plug wires, and plugs if something in them was wrong would the engine
> idle rough? I will get the fuel pressure checked at the fuel rail, but
> I think that the fuel pressure might be the problem. I'm not sure but
> wouldn't low fuel pressure also cause the same symptoms? See I had
> converted my jeep to a chevy 350 motor, it was running great but I
> couldn't get the drive shaft to the correct angle for the type of
> transmission I had. Also I wanted to be able to drive my jeep everyday,
> and with gas prices the way they are now, I decided to put the stock
> engine back in. So if anyone know anybody that wants a complet jeep to
> chevy engine conversion kit as well as a complete 350 with transmission
> and transfer case I have it. Now back to the problem, How can I find
> out if my distributor is turned wrong? and I will change the plug wires
> and plugs, and I will look into changing the coil as well, but if
> anyone knows anything else to try please let me know.
>
> Thanks