4.2L running like a bag of crap
 

I have a 4.2L with a brand new carb(nutters done) and header (feb) it has
run SWEET up until a month ago, now it's running like crap...

It's running really rich, that's the main symptom. Mileage isn't bad but
it's not as good as it was. plugs have about 10K, wires are about a year
old. it doesn't sputter or hesitate and still has great power. It seems to
run closer to normal when it's at operating temp, which makes sense.

Could this be as simple as adjusting the fuel/air mixture? Just seems weird
that "bang" it's running really rich

any help is appreciated

Jason

Re: 4.2L running like a bag of crap
 

99% of the time it is the other way, running too lean which acts like
too rich.

Here is a good link to the test and likely fix for it. The tool used
can be obtained at any welding supply shop, it is used for cleaning
torch tips.

http://www.off-road.com/jeep/tech/engine/carter.html

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Pi-Eyed Piper wrote:
>
> I have a 4.2L with a brand new carb(nutters done) and header (feb) it has
> run SWEET up until a month ago, now it's running like crap...
>
> It's running really rich, that's the main symptom. Mileage isn't bad but
> it's not as good as it was. plugs have about 10K, wires are about a year
> old. it doesn't sputter or hesitate and still has great power. It seems to
> run closer to normal when it's at operating temp, which makes sense.
>
> Could this be as simple as adjusting the fuel/air mixture? Just seems weird
> that "bang" it's running really rich
>
> any help is appreciated
>
> Jason

Re: 4.2L running like a bag of crap
 

99% of the time it is the other way, running too lean which acts like
too rich.

Here is a good link to the test and likely fix for it. The tool used
can be obtained at any welding supply shop, it is used for cleaning
torch tips.

http://www.off-road.com/jeep/tech/engine/carter.html

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Pi-Eyed Piper wrote:
>
> I have a 4.2L with a brand new carb(nutters done) and header (feb) it has
> run SWEET up until a month ago, now it's running like crap...
>
> It's running really rich, that's the main symptom. Mileage isn't bad but
> it's not as good as it was. plugs have about 10K, wires are about a year
> old. it doesn't sputter or hesitate and still has great power. It seems to
> run closer to normal when it's at operating temp, which makes sense.
>
> Could this be as simple as adjusting the fuel/air mixture? Just seems weird
> that "bang" it's running really rich
>
> any help is appreciated
>
> Jason

Re: 4.2L running like a bag of crap
 

99% of the time it is the other way, running too lean which acts like
too rich.

Here is a good link to the test and likely fix for it. The tool used
can be obtained at any welding supply shop, it is used for cleaning
torch tips.

http://www.off-road.com/jeep/tech/engine/carter.html

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Pi-Eyed Piper wrote:
>
> I have a 4.2L with a brand new carb(nutters done) and header (feb) it has
> run SWEET up until a month ago, now it's running like crap...
>
> It's running really rich, that's the main symptom. Mileage isn't bad but
> it's not as good as it was. plugs have about 10K, wires are about a year
> old. it doesn't sputter or hesitate and still has great power. It seems to
> run closer to normal when it's at operating temp, which makes sense.
>
> Could this be as simple as adjusting the fuel/air mixture? Just seems weird
> that "bang" it's running really rich
>
> any help is appreciated
>
> Jason

Re: 4.2L running like a bag of crap
 

99% of the time it is the other way, running too lean which acts like
too rich.

Here is a good link to the test and likely fix for it. The tool used
can be obtained at any welding supply shop, it is used for cleaning
torch tips.

http://www.off-road.com/jeep/tech/engine/carter.html

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Pi-Eyed Piper wrote:
>
> I have a 4.2L with a brand new carb(nutters done) and header (feb) it has
> run SWEET up until a month ago, now it's running like crap...
>
> It's running really rich, that's the main symptom. Mileage isn't bad but
> it's not as good as it was. plugs have about 10K, wires are about a year
> old. it doesn't sputter or hesitate and still has great power. It seems to
> run closer to normal when it's at operating temp, which makes sense.
>
> Could this be as simple as adjusting the fuel/air mixture? Just seems weird
> that "bang" it's running really rich
>
> any help is appreciated
>
> Jason

Re: 4.2L running like a bag of crap
 

"Pi-Eyed Piper" <notta@hello.com> wrote in message
news:MS8De.123242$HI.35377@edtnps84...
> I have a 4.2L with a brand new carb(nutters done) and header (feb) it has
> run SWEET up until a month ago, now it's running like crap...
>
> It's running really rich, that's the main symptom. Mileage isn't bad but
> it's not as good as it was. plugs have about 10K, wires are about a year
> old. it doesn't sputter or hesitate and still has great power. It seems to
> run closer to normal when it's at operating temp, which makes sense.
>
> Could this be as simple as adjusting the fuel/air mixture? Just seems
weird
> that "bang" it's running really rich
>
> any help is appreciated
>
> Jason


Is the air cleaner element filthy? Have you looked at the needle-and-seat
assembly in the carb to see if crud is getting past your fuel filter? Have
you actually pulled the plugs to see how they look? Have you been getting
gas at a different station than you used to?

Just a few of the more obvious things to double-check in case you missed
any of them...



-Matt- "..."

Re: 4.2L running like a bag of crap
 

"Pi-Eyed Piper" <notta@hello.com> wrote in message
news:MS8De.123242$HI.35377@edtnps84...
> I have a 4.2L with a brand new carb(nutters done) and header (feb) it has
> run SWEET up until a month ago, now it's running like crap...
>
> It's running really rich, that's the main symptom. Mileage isn't bad but
> it's not as good as it was. plugs have about 10K, wires are about a year
> old. it doesn't sputter or hesitate and still has great power. It seems to
> run closer to normal when it's at operating temp, which makes sense.
>
> Could this be as simple as adjusting the fuel/air mixture? Just seems
weird
> that "bang" it's running really rich
>
> any help is appreciated
>
> Jason


Is the air cleaner element filthy? Have you looked at the needle-and-seat
assembly in the carb to see if crud is getting past your fuel filter? Have
you actually pulled the plugs to see how they look? Have you been getting
gas at a different station than you used to?

Just a few of the more obvious things to double-check in case you missed
any of them...



-Matt- "..."

Re: 4.2L running like a bag of crap
 

"Pi-Eyed Piper" <notta@hello.com> wrote in message
news:MS8De.123242$HI.35377@edtnps84...
> I have a 4.2L with a brand new carb(nutters done) and header (feb) it has
> run SWEET up until a month ago, now it's running like crap...
>
> It's running really rich, that's the main symptom. Mileage isn't bad but
> it's not as good as it was. plugs have about 10K, wires are about a year
> old. it doesn't sputter or hesitate and still has great power. It seems to
> run closer to normal when it's at operating temp, which makes sense.
>
> Could this be as simple as adjusting the fuel/air mixture? Just seems
weird
> that "bang" it's running really rich
>
> any help is appreciated
>
> Jason


Is the air cleaner element filthy? Have you looked at the needle-and-seat
assembly in the carb to see if crud is getting past your fuel filter? Have
you actually pulled the plugs to see how they look? Have you been getting
gas at a different station than you used to?

Just a few of the more obvious things to double-check in case you missed
any of them...



-Matt- "..."

Re: 4.2L running like a bag of crap
 

"Pi-Eyed Piper" <notta@hello.com> wrote in message
news:MS8De.123242$HI.35377@edtnps84...
> I have a 4.2L with a brand new carb(nutters done) and header (feb) it has
> run SWEET up until a month ago, now it's running like crap...
>
> It's running really rich, that's the main symptom. Mileage isn't bad but
> it's not as good as it was. plugs have about 10K, wires are about a year
> old. it doesn't sputter or hesitate and still has great power. It seems to
> run closer to normal when it's at operating temp, which makes sense.
>
> Could this be as simple as adjusting the fuel/air mixture? Just seems
weird
> that "bang" it's running really rich
>
> any help is appreciated
>
> Jason


Is the air cleaner element filthy? Have you looked at the needle-and-seat
assembly in the carb to see if crud is getting past your fuel filter? Have
you actually pulled the plugs to see how they look? Have you been getting
gas at a different station than you used to?

Just a few of the more obvious things to double-check in case you missed
any of them...



-Matt- "..."

Re: 4.2L running like a bag of crap
 

ok, I'll check that. With the carb being so new I didn't actually think to
do that, I know these carbs can be troublsome.

Jason
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:42DD25D7.FB13C2B5@sympatico.ca...
> 99% of the time it is the other way, running too lean which acts like
> too rich.
>
> Here is a good link to the test and likely fix for it. The tool used
> can be obtained at any welding supply shop, it is used for cleaning
> torch tips.
>
> http://www.off-road.com/jeep/tech/engine/carter.html
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Pi-Eyed Piper wrote:
>>
>> I have a 4.2L with a brand new carb(nutters done) and header (feb) it has
>> run SWEET up until a month ago, now it's running like crap...
>>
>> It's running really rich, that's the main symptom. Mileage isn't bad but
>> it's not as good as it was. plugs have about 10K, wires are about a year
>> old. it doesn't sputter or hesitate and still has great power. It seems
>> to
>> run closer to normal when it's at operating temp, which makes sense.
>>
>> Could this be as simple as adjusting the fuel/air mixture? Just seems
>> weird
>> that "bang" it's running really rich
>>
>> any help is appreciated
>>
>> Jason