Re: 258 stalls at idle
 

Highcountry wrote:
> Just adding a note about a FREAK happening that just about drove me
> wild!
>
> When I got my 86 CJ it suffered from the common malady of the NOX
> reduction "enrichment system" causing it to load up and die at idle.
> Being an "old geezer" from before the EPA forced Carter to ruin the
> BBD, I simply modified my BBD carb to eliminate the useless "enricher
> motor" on the rear and re-set everything to old style specs while also
> performing the "Nutter Bypass" to eliminate the no longer used
> circuitry.
>
> The CJ ran flawlessly for about 3 years and then started sputtering at
> idle. "What the...?", I thought. So all through the carb I went
> searching for the culprit. Found it floating around under the "idle
> tubes". Where did this piece of flotsam come from? I found that
> out as well, starting the Jeep and letting it run with the lid off the
> air cleaner during adjustments I noticed that the "Air Injection"
> hoses that branch off the back of the cleaner went through a stage
> during warmup where they sputtered a little condensate back into the
> air cleaner housing. Amongst that condensate were some tiny flakes
> of "crud" just like the one I had removed! If one of these just
> happens to make its way over to the float bowl opening, it will
> eventually find its way to the "idle tubes" and repeat the problem.
> I know it is a "long shot" but it was the logical reason for the
> problem considering the surgical clean rooom method I use when
> tinkering...
>
> Those little problem makers are now disabled, and I don't plan on
> tearing apart my BBD for another 10 years or so until the pump and
> needle are tired!
>
> Bruce
>

I find I need to clean my float needle and seat every couple years. I
also needed emissions every couple years so I would normally just kit
the carb for $20.00 and have everything new. Those are really easy
carbs to kit.

I 'think' I know one source of your black chunks in the float bowl.

If you run that 258 engine out of gas when warmed up, the charcoal
canister is active because of the hot coolant in the CTO valve. Then
when you are trying to start it up, the choke will automatically be
closed which puts high vacuum on everything which will sometimes suck
charcoal bits out of the canister.

I have had this happen to me and have seen it happen to others. One
person from this group I think it was put a clear inline gas filter in
the vent line to the carb float bowl to prevent this from happening. He
reported finding bits of charcoal in the filter.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Re: 258 stalls at idle
 

Highcountry wrote:
> Just adding a note about a FREAK happening that just about drove me
> wild!
>
> When I got my 86 CJ it suffered from the common malady of the NOX
> reduction "enrichment system" causing it to load up and die at idle.
> Being an "old geezer" from before the EPA forced Carter to ruin the
> BBD, I simply modified my BBD carb to eliminate the useless "enricher
> motor" on the rear and re-set everything to old style specs while also
> performing the "Nutter Bypass" to eliminate the no longer used
> circuitry.
>
> The CJ ran flawlessly for about 3 years and then started sputtering at
> idle. "What the...?", I thought. So all through the carb I went
> searching for the culprit. Found it floating around under the "idle
> tubes". Where did this piece of flotsam come from? I found that
> out as well, starting the Jeep and letting it run with the lid off the
> air cleaner during adjustments I noticed that the "Air Injection"
> hoses that branch off the back of the cleaner went through a stage
> during warmup where they sputtered a little condensate back into the
> air cleaner housing. Amongst that condensate were some tiny flakes
> of "crud" just like the one I had removed! If one of these just
> happens to make its way over to the float bowl opening, it will
> eventually find its way to the "idle tubes" and repeat the problem.
> I know it is a "long shot" but it was the logical reason for the
> problem considering the surgical clean rooom method I use when
> tinkering...
>
> Those little problem makers are now disabled, and I don't plan on
> tearing apart my BBD for another 10 years or so until the pump and
> needle are tired!
>
> Bruce
>

I find I need to clean my float needle and seat every couple years. I
also needed emissions every couple years so I would normally just kit
the carb for $20.00 and have everything new. Those are really easy
carbs to kit.

I 'think' I know one source of your black chunks in the float bowl.

If you run that 258 engine out of gas when warmed up, the charcoal
canister is active because of the hot coolant in the CTO valve. Then
when you are trying to start it up, the choke will automatically be
closed which puts high vacuum on everything which will sometimes suck
charcoal bits out of the canister.

I have had this happen to me and have seen it happen to others. One
person from this group I think it was put a clear inline gas filter in
the vent line to the carb float bowl to prevent this from happening. He
reported finding bits of charcoal in the filter.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)