average mileage in the city for a 4.2L
 

has anyone checked their city mileage for a 4.2L?

As I listed earlier I changed the carb and header on my 89YJ, 31" tires I
dont know the gearing (stock im sure), and the thing is running sweet. BUT I
just checked the mileage.....10.50 MPG!!! I have another issue that is not
helping, maybe you guys have some ideas. The choke is sticking on the last
stage. The linkage is loose and everything seems fine, just a lot of metal
grabbing. so in stop and go traffic idling at 1000-1200 instead of 800 would
make a fair bit of difference wouldn't it?

any suggestions are appreciated.

Re: average mileage in the city for a 4.2L
 

That is crappie mileage. First I would check the odometer to see how
far off it is with the 31's on there. Even if they are off 10% though
you still would be getting crappie mileage.

The only 2 reasons the fast idle is staying on is dirt or the choke is
bad. Some carb cleaner spray on the linkage parts can do it wonders.

Then figure idle at 500-700 vs 1200. 1200 isn't a good thing.....

Will the idle come down to 500 or 600? It should come really close to
that, mine is running around 600 right now. If it won't maybe the mix
is off or the idle tubes are plugged which is an easy fix.

Does the choke have a good electrical connection?

Is the computer having a brain fart clamping it into 'limp home' mode or
did you wire the ignition module direct to the distributor to bypass it
or put some other system in?

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:
>
> has anyone checked their city mileage for a 4.2L?
>
> As I listed earlier I changed the carb and header on my 89YJ, 31" tires I
> dont know the gearing (stock im sure), and the thing is running sweet. BUT I
> just checked the mileage.....10.50 MPG!!! I have another issue that is not
> helping, maybe you guys have some ideas. The choke is sticking on the last
> stage. The linkage is loose and everything seems fine, just a lot of metal
> grabbing. so in stop and go traffic idling at 1000-1200 instead of 800 would
> make a fair bit of difference wouldn't it?
>
> any suggestions are appreciated.

Re: average mileage in the city for a 4.2L
 

That is crappie mileage. First I would check the odometer to see how
far off it is with the 31's on there. Even if they are off 10% though
you still would be getting crappie mileage.

The only 2 reasons the fast idle is staying on is dirt or the choke is
bad. Some carb cleaner spray on the linkage parts can do it wonders.

Then figure idle at 500-700 vs 1200. 1200 isn't a good thing.....

Will the idle come down to 500 or 600? It should come really close to
that, mine is running around 600 right now. If it won't maybe the mix
is off or the idle tubes are plugged which is an easy fix.

Does the choke have a good electrical connection?

Is the computer having a brain fart clamping it into 'limp home' mode or
did you wire the ignition module direct to the distributor to bypass it
or put some other system in?

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:
>
> has anyone checked their city mileage for a 4.2L?
>
> As I listed earlier I changed the carb and header on my 89YJ, 31" tires I
> dont know the gearing (stock im sure), and the thing is running sweet. BUT I
> just checked the mileage.....10.50 MPG!!! I have another issue that is not
> helping, maybe you guys have some ideas. The choke is sticking on the last
> stage. The linkage is loose and everything seems fine, just a lot of metal
> grabbing. so in stop and go traffic idling at 1000-1200 instead of 800 would
> make a fair bit of difference wouldn't it?
>
> any suggestions are appreciated.

Re: average mileage in the city for a 4.2L
 

That is crappie mileage. First I would check the odometer to see how
far off it is with the 31's on there. Even if they are off 10% though
you still would be getting crappie mileage.

The only 2 reasons the fast idle is staying on is dirt or the choke is
bad. Some carb cleaner spray on the linkage parts can do it wonders.

Then figure idle at 500-700 vs 1200. 1200 isn't a good thing.....

Will the idle come down to 500 or 600? It should come really close to
that, mine is running around 600 right now. If it won't maybe the mix
is off or the idle tubes are plugged which is an easy fix.

Does the choke have a good electrical connection?

Is the computer having a brain fart clamping it into 'limp home' mode or
did you wire the ignition module direct to the distributor to bypass it
or put some other system in?

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:
>
> has anyone checked their city mileage for a 4.2L?
>
> As I listed earlier I changed the carb and header on my 89YJ, 31" tires I
> dont know the gearing (stock im sure), and the thing is running sweet. BUT I
> just checked the mileage.....10.50 MPG!!! I have another issue that is not
> helping, maybe you guys have some ideas. The choke is sticking on the last
> stage. The linkage is loose and everything seems fine, just a lot of metal
> grabbing. so in stop and go traffic idling at 1000-1200 instead of 800 would
> make a fair bit of difference wouldn't it?
>
> any suggestions are appreciated.

Re: average mileage in the city for a 4.2L
 

The system has no computer, it's gone when we changed the carb and installed
the header. The carb is from a 77 CJ, NO emissions stuff at all.

I am using the electric choke from my old carb. The choke is set to 1800
rpm, then the second stage is set to 1200RPM. Thats where it sticks. It will
kick off from 1800RPM to 1000-1200 no problem. then I have to pop the hood
and manually take to choke off the last "tick" so it idles at 700RPM (which
is does fine).

This is a brand new refurbished carb, using the OLD electric choke. I
sprayed the linkage when we installed it and thought it would "work itself
out" but it's been almost a week.


"Mike Romain" <romainm@sympatico.ca> wrote in message
news:423B0DBE.FD6DBE62@sympatico.ca...
> That is crappie mileage. First I would check the odometer to see how
> far off it is with the 31's on there. Even if they are off 10% though
> you still would be getting crappie mileage.
>
> The only 2 reasons the fast idle is staying on is dirt or the choke is
> bad. Some carb cleaner spray on the linkage parts can do it wonders.
>
> Then figure idle at 500-700 vs 1200. 1200 isn't a good thing.....
>
> Will the idle come down to 500 or 600? It should come really close to
> that, mine is running around 600 right now. If it won't maybe the mix
> is off or the idle tubes are plugged which is an easy fix.
>
> Does the choke have a good electrical connection?
>
> Is the computer having a brain fart clamping it into 'limp home' mode or
> did you wire the ignition module direct to the distributor to bypass it
> or put some other system in?
>
> 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:
> >
> > has anyone checked their city mileage for a 4.2L?
> >
> > As I listed earlier I changed the carb and header on my 89YJ, 31" tires
I
> > dont know the gearing (stock im sure), and the thing is running sweet.
BUT I
> > just checked the mileage.....10.50 MPG!!! I have another issue that is
not
> > helping, maybe you guys have some ideas. The choke is sticking on the
last
> > stage. The linkage is loose and everything seems fine, just a lot of
metal
> > grabbing. so in stop and go traffic idling at 1000-1200 instead of 800
would
> > make a fair bit of difference wouldn't it?
> >
> > any suggestions are appreciated.

Re: average mileage in the city for a 4.2L
 

The system has no computer, it's gone when we changed the carb and installed
the header. The carb is from a 77 CJ, NO emissions stuff at all.

I am using the electric choke from my old carb. The choke is set to 1800
rpm, then the second stage is set to 1200RPM. Thats where it sticks. It will
kick off from 1800RPM to 1000-1200 no problem. then I have to pop the hood
and manually take to choke off the last "tick" so it idles at 700RPM (which
is does fine).

This is a brand new refurbished carb, using the OLD electric choke. I
sprayed the linkage when we installed it and thought it would "work itself
out" but it's been almost a week.


"Mike Romain" <romainm@sympatico.ca> wrote in message
news:423B0DBE.FD6DBE62@sympatico.ca...
> That is crappie mileage. First I would check the odometer to see how
> far off it is with the 31's on there. Even if they are off 10% though
> you still would be getting crappie mileage.
>
> The only 2 reasons the fast idle is staying on is dirt or the choke is
> bad. Some carb cleaner spray on the linkage parts can do it wonders.
>
> Then figure idle at 500-700 vs 1200. 1200 isn't a good thing.....
>
> Will the idle come down to 500 or 600? It should come really close to
> that, mine is running around 600 right now. If it won't maybe the mix
> is off or the idle tubes are plugged which is an easy fix.
>
> Does the choke have a good electrical connection?
>
> Is the computer having a brain fart clamping it into 'limp home' mode or
> did you wire the ignition module direct to the distributor to bypass it
> or put some other system in?
>
> 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:
> >
> > has anyone checked their city mileage for a 4.2L?
> >
> > As I listed earlier I changed the carb and header on my 89YJ, 31" tires
I
> > dont know the gearing (stock im sure), and the thing is running sweet.
BUT I
> > just checked the mileage.....10.50 MPG!!! I have another issue that is
not
> > helping, maybe you guys have some ideas. The choke is sticking on the
last
> > stage. The linkage is loose and everything seems fine, just a lot of
metal
> > grabbing. so in stop and go traffic idling at 1000-1200 instead of 800
would
> > make a fair bit of difference wouldn't it?
> >
> > any suggestions are appreciated.

Re: average mileage in the city for a 4.2L
 

The system has no computer, it's gone when we changed the carb and installed
the header. The carb is from a 77 CJ, NO emissions stuff at all.

I am using the electric choke from my old carb. The choke is set to 1800
rpm, then the second stage is set to 1200RPM. Thats where it sticks. It will
kick off from 1800RPM to 1000-1200 no problem. then I have to pop the hood
and manually take to choke off the last "tick" so it idles at 700RPM (which
is does fine).

This is a brand new refurbished carb, using the OLD electric choke. I
sprayed the linkage when we installed it and thought it would "work itself
out" but it's been almost a week.


"Mike Romain" <romainm@sympatico.ca> wrote in message
news:423B0DBE.FD6DBE62@sympatico.ca...
> That is crappie mileage. First I would check the odometer to see how
> far off it is with the 31's on there. Even if they are off 10% though
> you still would be getting crappie mileage.
>
> The only 2 reasons the fast idle is staying on is dirt or the choke is
> bad. Some carb cleaner spray on the linkage parts can do it wonders.
>
> Then figure idle at 500-700 vs 1200. 1200 isn't a good thing.....
>
> Will the idle come down to 500 or 600? It should come really close to
> that, mine is running around 600 right now. If it won't maybe the mix
> is off or the idle tubes are plugged which is an easy fix.
>
> Does the choke have a good electrical connection?
>
> Is the computer having a brain fart clamping it into 'limp home' mode or
> did you wire the ignition module direct to the distributor to bypass it
> or put some other system in?
>
> 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:
> >
> > has anyone checked their city mileage for a 4.2L?
> >
> > As I listed earlier I changed the carb and header on my 89YJ, 31" tires
I
> > dont know the gearing (stock im sure), and the thing is running sweet.
BUT I
> > just checked the mileage.....10.50 MPG!!! I have another issue that is
not
> > helping, maybe you guys have some ideas. The choke is sticking on the
last
> > stage. The linkage is loose and everything seems fine, just a lot of
metal
> > grabbing. so in stop and go traffic idling at 1000-1200 instead of 800
would
> > make a fair bit of difference wouldn't it?
> >
> > any suggestions are appreciated.

Re: average mileage in the city for a 4.2L
 

also, when we were setting the carb up it would idle as low as 400rpm...

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:423B0DBE.FD6DBE62@sympatico.ca...
> That is crappie mileage. First I would check the odometer to see how
> far off it is with the 31's on there. Even if they are off 10% though
> you still would be getting crappie mileage.
>
> The only 2 reasons the fast idle is staying on is dirt or the choke is
> bad. Some carb cleaner spray on the linkage parts can do it wonders.
>
> Then figure idle at 500-700 vs 1200. 1200 isn't a good thing.....
>
> Will the idle come down to 500 or 600? It should come really close to
> that, mine is running around 600 right now. If it won't maybe the mix
> is off or the idle tubes are plugged which is an easy fix.
>
> Does the choke have a good electrical connection?
>
> Is the computer having a brain fart clamping it into 'limp home' mode or
> did you wire the ignition module direct to the distributor to bypass it
> or put some other system in?
>
> 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:
> >
> > has anyone checked their city mileage for a 4.2L?
> >
> > As I listed earlier I changed the carb and header on my 89YJ, 31" tires
I
> > dont know the gearing (stock im sure), and the thing is running sweet.
BUT I
> > just checked the mileage.....10.50 MPG!!! I have another issue that is
not
> > helping, maybe you guys have some ideas. The choke is sticking on the
last
> > stage. The linkage is loose and everything seems fine, just a lot of
metal
> > grabbing. so in stop and go traffic idling at 1000-1200 instead of 800
would
> > make a fair bit of difference wouldn't it?
> >
> > any suggestions are appreciated.

Re: average mileage in the city for a 4.2L
 

also, when we were setting the carb up it would idle as low as 400rpm...

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:423B0DBE.FD6DBE62@sympatico.ca...
> That is crappie mileage. First I would check the odometer to see how
> far off it is with the 31's on there. Even if they are off 10% though
> you still would be getting crappie mileage.
>
> The only 2 reasons the fast idle is staying on is dirt or the choke is
> bad. Some carb cleaner spray on the linkage parts can do it wonders.
>
> Then figure idle at 500-700 vs 1200. 1200 isn't a good thing.....
>
> Will the idle come down to 500 or 600? It should come really close to
> that, mine is running around 600 right now. If it won't maybe the mix
> is off or the idle tubes are plugged which is an easy fix.
>
> Does the choke have a good electrical connection?
>
> Is the computer having a brain fart clamping it into 'limp home' mode or
> did you wire the ignition module direct to the distributor to bypass it
> or put some other system in?
>
> 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:
> >
> > has anyone checked their city mileage for a 4.2L?
> >
> > As I listed earlier I changed the carb and header on my 89YJ, 31" tires
I
> > dont know the gearing (stock im sure), and the thing is running sweet.
BUT I
> > just checked the mileage.....10.50 MPG!!! I have another issue that is
not
> > helping, maybe you guys have some ideas. The choke is sticking on the
last
> > stage. The linkage is loose and everything seems fine, just a lot of
metal
> > grabbing. so in stop and go traffic idling at 1000-1200 instead of 800
would
> > make a fair bit of difference wouldn't it?
> >
> > any suggestions are appreciated.

Re: average mileage in the city for a 4.2L
 

also, when we were setting the carb up it would idle as low as 400rpm...

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:423B0DBE.FD6DBE62@sympatico.ca...
> That is crappie mileage. First I would check the odometer to see how
> far off it is with the 31's on there. Even if they are off 10% though
> you still would be getting crappie mileage.
>
> The only 2 reasons the fast idle is staying on is dirt or the choke is
> bad. Some carb cleaner spray on the linkage parts can do it wonders.
>
> Then figure idle at 500-700 vs 1200. 1200 isn't a good thing.....
>
> Will the idle come down to 500 or 600? It should come really close to
> that, mine is running around 600 right now. If it won't maybe the mix
> is off or the idle tubes are plugged which is an easy fix.
>
> Does the choke have a good electrical connection?
>
> Is the computer having a brain fart clamping it into 'limp home' mode or
> did you wire the ignition module direct to the distributor to bypass it
> or put some other system in?
>
> 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:
> >
> > has anyone checked their city mileage for a 4.2L?
> >
> > As I listed earlier I changed the carb and header on my 89YJ, 31" tires
I
> > dont know the gearing (stock im sure), and the thing is running sweet.
BUT I
> > just checked the mileage.....10.50 MPG!!! I have another issue that is
not
> > helping, maybe you guys have some ideas. The choke is sticking on the
last
> > stage. The linkage is loose and everything seems fine, just a lot of
metal
> > grabbing. so in stop and go traffic idling at 1000-1200 instead of 800
would
> > make a fair bit of difference wouldn't it?
> >
> > any suggestions are appreciated.