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1886 Grand Wagoneer
Well thanks to the help of this board the Wagoneer is back on the
road, albeit a little shaky. I can't seem to get the carb set right. I had a problem with it loping in idle or at stop with transmission in gear. I heard a high pitched whine, and sionc the water pump was leaking I thought that might be the culprit. I replaced it and the fuel pump for good measure. ( I figured with the front disassembled and for a $20 pump, what the hell). Anyway, it turns out the sound wasn't either pump (or the air pump) but seems to be coming from the carburetor, which I recently rebuilt. My question is, could this be caused by a faulty power valve and can I replace that without buying another rebuild kit? |
Re: 1886 Grand Wagoneer
jimmy3stix@comcast.net wrote:
> Well thanks to the help of this board the Wagoneer is back on the > road, albeit a little shaky. I can't seem to get the carb set right. > I had a problem with it loping in idle or at stop with transmission in > gear. I heard a high pitched whine, and sionc the water pump was > leaking I thought that might be the culprit. I replaced it and the > fuel pump for good measure. ( I figured with the front disassembled > and for a $20 pump, what the hell). Anyway, it turns out the sound > wasn't either pump (or the air pump) but seems to be coming from the > carburetor, which I recently rebuilt. My question is, could this be > caused by a faulty power valve and can I replace that without buying > another rebuild kit? > Loping at idle screams gas tank and carb air vent failure to me. When the purge valve wears out on the charcoal canister it will cause the engine to lope at idle. If the $2.00 air filter on the bottom of the charcoal canister is blocked, the carb float bowl and gas tank get vacuums on them which can cause loping and a bad loss of top end power tot he point of imitating running out of gas. To check the air filter, just open the gas cap and see how it runs. I have seen the idle speeds change instantly that way. The purge can be checked by tracing the PCV system and finding the line that goes to the top of the canister from the intake manifold. It T's off behind the carb on the 258. At idle pinch this line to the canister closed. If the idle changes, the canister is dead. This line will be right below the round valve that sits on top of the canister with the smaller vacuum line going to it. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's - Gone to the rust pile... 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: 1886 Grand Wagoneer
jimmy3stix@comcast.net wrote:
> Well thanks to the help of this board the Wagoneer is back on the > road, albeit a little shaky. I can't seem to get the carb set right. > I had a problem with it loping in idle or at stop with transmission in > gear. I heard a high pitched whine, and sionc the water pump was > leaking I thought that might be the culprit. I replaced it and the > fuel pump for good measure. ( I figured with the front disassembled > and for a $20 pump, what the hell). Anyway, it turns out the sound > wasn't either pump (or the air pump) but seems to be coming from the > carburetor, which I recently rebuilt. My question is, could this be > caused by a faulty power valve and can I replace that without buying > another rebuild kit? > Loping at idle screams gas tank and carb air vent failure to me. When the purge valve wears out on the charcoal canister it will cause the engine to lope at idle. If the $2.00 air filter on the bottom of the charcoal canister is blocked, the carb float bowl and gas tank get vacuums on them which can cause loping and a bad loss of top end power tot he point of imitating running out of gas. To check the air filter, just open the gas cap and see how it runs. I have seen the idle speeds change instantly that way. The purge can be checked by tracing the PCV system and finding the line that goes to the top of the canister from the intake manifold. It T's off behind the carb on the 258. At idle pinch this line to the canister closed. If the idle changes, the canister is dead. This line will be right below the round valve that sits on top of the canister with the smaller vacuum line going to it. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's - Gone to the rust pile... 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: 1886 Grand Wagoneer
jimmy3stix@comcast.net wrote:
> Well thanks to the help of this board the Wagoneer is back on the > road, albeit a little shaky. I can't seem to get the carb set right. > I had a problem with it loping in idle or at stop with transmission in > gear. I heard a high pitched whine, and sionc the water pump was > leaking I thought that might be the culprit. I replaced it and the > fuel pump for good measure. ( I figured with the front disassembled > and for a $20 pump, what the hell). Anyway, it turns out the sound > wasn't either pump (or the air pump) but seems to be coming from the > carburetor, which I recently rebuilt. My question is, could this be > caused by a faulty power valve and can I replace that without buying > another rebuild kit? > Loping at idle screams gas tank and carb air vent failure to me. When the purge valve wears out on the charcoal canister it will cause the engine to lope at idle. If the $2.00 air filter on the bottom of the charcoal canister is blocked, the carb float bowl and gas tank get vacuums on them which can cause loping and a bad loss of top end power tot he point of imitating running out of gas. To check the air filter, just open the gas cap and see how it runs. I have seen the idle speeds change instantly that way. The purge can be checked by tracing the PCV system and finding the line that goes to the top of the canister from the intake manifold. It T's off behind the carb on the 258. At idle pinch this line to the canister closed. If the idle changes, the canister is dead. This line will be right below the round valve that sits on top of the canister with the smaller vacuum line going to it. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's - Gone to the rust pile... 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: 1886 Grand Wagoneer
jimmy3stix@comcast.net wrote:
> Well thanks to the help of this board the Wagoneer is back on the > road, albeit a little shaky. I can't seem to get the carb set right. > I had a problem with it loping in idle or at stop with transmission in > gear. I heard a high pitched whine, and sionc the water pump was > leaking I thought that might be the culprit. I replaced it and the > fuel pump for good measure. ( I figured with the front disassembled > and for a $20 pump, what the hell). Anyway, it turns out the sound > wasn't either pump (or the air pump) but seems to be coming from the > carburetor, which I recently rebuilt. My question is, could this be > caused by a faulty power valve and can I replace that without buying > another rebuild kit? > Loping at idle screams gas tank and carb air vent failure to me. When the purge valve wears out on the charcoal canister it will cause the engine to lope at idle. If the $2.00 air filter on the bottom of the charcoal canister is blocked, the carb float bowl and gas tank get vacuums on them which can cause loping and a bad loss of top end power tot he point of imitating running out of gas. To check the air filter, just open the gas cap and see how it runs. I have seen the idle speeds change instantly that way. The purge can be checked by tracing the PCV system and finding the line that goes to the top of the canister from the intake manifold. It T's off behind the carb on the 258. At idle pinch this line to the canister closed. If the idle changes, the canister is dead. This line will be right below the round valve that sits on top of the canister with the smaller vacuum line going to it. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's - Gone to the rust pile... 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: 1886 Grand Wagoneer
On Aug 6, 12:17 pm, Mike Romain <roma...@sympatico.ca> wrote:
> jimmy3s...@comcast.net wrote: > > Well thanks to the help of this board the Wagoneer is back on the > > road, albeit a little shaky. I can't seem to get the carb set right. > > I had a problem with it loping in idle or at stop with transmission in > > gear. I heard a high pitched whine, and sionc the water pump was > > leaking I thought that might be the culprit. I replaced it and the > > fuel pump for good measure. ( I figured with the front disassembled > > and for a $20 pump, what the hell). Anyway, it turns out the sound > > wasn't either pump (or the air pump) but seems to be coming from the > > carburetor, which I recently rebuilt. My question is, could this be > > caused by a faulty power valve and can I replace that without buying > > another rebuild kit? > > Loping at idle screams gas tank and carb air vent failure to me. > > When the purge valve wears out on the charcoal canister it will cause > the engine to lope at idle. If the $2.00 air filter on the bottom of > the charcoal canister is blocked, the carb float bowl and gas tank get > vacuums on them which can cause loping and a bad loss of top end power > tot he point of imitating running out of gas. > > To check the air filter, just open the gas cap and see how it runs. I > have seen the idle speeds change instantly that way. > > The purge can be checked by tracing the PCV system and finding the line > that goes to the top of the canister from the intake manifold. It T's > off behind the carb on the 258. At idle pinch this line to the canister > closed. If the idle changes, the canister is dead. This line will be > right below the round valve that sits on top of the canister with the > smaller vacuum line going to it. > > Mike > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 > 88 Cherokee 235 BFG AT's - Gone to the rust pile... > Canadian Off Road Trips Photos: Non members can still view! > Jan/06http://www.imagestation.com/album/pictures.html?id=2115147590 > (More Off Road album links at bottom of the view page) Mike, I have no loss of power, it only happens at idle. The filter in the charcoal canister has just been replaced, though it could be the purge valve. Can that be replaced or do I replace the entire canister? Also, what would make the carb whine? It comes and goes but seems to whine more when there is no acceleration, ie. when idling or having reached steady speed. |
Re: 1886 Grand Wagoneer
On Aug 6, 12:17 pm, Mike Romain <roma...@sympatico.ca> wrote:
> jimmy3s...@comcast.net wrote: > > Well thanks to the help of this board the Wagoneer is back on the > > road, albeit a little shaky. I can't seem to get the carb set right. > > I had a problem with it loping in idle or at stop with transmission in > > gear. I heard a high pitched whine, and sionc the water pump was > > leaking I thought that might be the culprit. I replaced it and the > > fuel pump for good measure. ( I figured with the front disassembled > > and for a $20 pump, what the hell). Anyway, it turns out the sound > > wasn't either pump (or the air pump) but seems to be coming from the > > carburetor, which I recently rebuilt. My question is, could this be > > caused by a faulty power valve and can I replace that without buying > > another rebuild kit? > > Loping at idle screams gas tank and carb air vent failure to me. > > When the purge valve wears out on the charcoal canister it will cause > the engine to lope at idle. If the $2.00 air filter on the bottom of > the charcoal canister is blocked, the carb float bowl and gas tank get > vacuums on them which can cause loping and a bad loss of top end power > tot he point of imitating running out of gas. > > To check the air filter, just open the gas cap and see how it runs. I > have seen the idle speeds change instantly that way. > > The purge can be checked by tracing the PCV system and finding the line > that goes to the top of the canister from the intake manifold. It T's > off behind the carb on the 258. At idle pinch this line to the canister > closed. If the idle changes, the canister is dead. This line will be > right below the round valve that sits on top of the canister with the > smaller vacuum line going to it. > > Mike > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 > 88 Cherokee 235 BFG AT's - Gone to the rust pile... > Canadian Off Road Trips Photos: Non members can still view! > Jan/06http://www.imagestation.com/album/pictures.html?id=2115147590 > (More Off Road album links at bottom of the view page) Mike, I have no loss of power, it only happens at idle. The filter in the charcoal canister has just been replaced, though it could be the purge valve. Can that be replaced or do I replace the entire canister? Also, what would make the carb whine? It comes and goes but seems to whine more when there is no acceleration, ie. when idling or having reached steady speed. |
Re: 1886 Grand Wagoneer
On Aug 6, 12:17 pm, Mike Romain <roma...@sympatico.ca> wrote:
> jimmy3s...@comcast.net wrote: > > Well thanks to the help of this board the Wagoneer is back on the > > road, albeit a little shaky. I can't seem to get the carb set right. > > I had a problem with it loping in idle or at stop with transmission in > > gear. I heard a high pitched whine, and sionc the water pump was > > leaking I thought that might be the culprit. I replaced it and the > > fuel pump for good measure. ( I figured with the front disassembled > > and for a $20 pump, what the hell). Anyway, it turns out the sound > > wasn't either pump (or the air pump) but seems to be coming from the > > carburetor, which I recently rebuilt. My question is, could this be > > caused by a faulty power valve and can I replace that without buying > > another rebuild kit? > > Loping at idle screams gas tank and carb air vent failure to me. > > When the purge valve wears out on the charcoal canister it will cause > the engine to lope at idle. If the $2.00 air filter on the bottom of > the charcoal canister is blocked, the carb float bowl and gas tank get > vacuums on them which can cause loping and a bad loss of top end power > tot he point of imitating running out of gas. > > To check the air filter, just open the gas cap and see how it runs. I > have seen the idle speeds change instantly that way. > > The purge can be checked by tracing the PCV system and finding the line > that goes to the top of the canister from the intake manifold. It T's > off behind the carb on the 258. At idle pinch this line to the canister > closed. If the idle changes, the canister is dead. This line will be > right below the round valve that sits on top of the canister with the > smaller vacuum line going to it. > > Mike > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 > 88 Cherokee 235 BFG AT's - Gone to the rust pile... > Canadian Off Road Trips Photos: Non members can still view! > Jan/06http://www.imagestation.com/album/pictures.html?id=2115147590 > (More Off Road album links at bottom of the view page) Mike, I have no loss of power, it only happens at idle. The filter in the charcoal canister has just been replaced, though it could be the purge valve. Can that be replaced or do I replace the entire canister? Also, what would make the carb whine? It comes and goes but seems to whine more when there is no acceleration, ie. when idling or having reached steady speed. |
Re: 1886 Grand Wagoneer
On Aug 6, 12:17 pm, Mike Romain <roma...@sympatico.ca> wrote:
> jimmy3s...@comcast.net wrote: > > Well thanks to the help of this board the Wagoneer is back on the > > road, albeit a little shaky. I can't seem to get the carb set right. > > I had a problem with it loping in idle or at stop with transmission in > > gear. I heard a high pitched whine, and sionc the water pump was > > leaking I thought that might be the culprit. I replaced it and the > > fuel pump for good measure. ( I figured with the front disassembled > > and for a $20 pump, what the hell). Anyway, it turns out the sound > > wasn't either pump (or the air pump) but seems to be coming from the > > carburetor, which I recently rebuilt. My question is, could this be > > caused by a faulty power valve and can I replace that without buying > > another rebuild kit? > > Loping at idle screams gas tank and carb air vent failure to me. > > When the purge valve wears out on the charcoal canister it will cause > the engine to lope at idle. If the $2.00 air filter on the bottom of > the charcoal canister is blocked, the carb float bowl and gas tank get > vacuums on them which can cause loping and a bad loss of top end power > tot he point of imitating running out of gas. > > To check the air filter, just open the gas cap and see how it runs. I > have seen the idle speeds change instantly that way. > > The purge can be checked by tracing the PCV system and finding the line > that goes to the top of the canister from the intake manifold. It T's > off behind the carb on the 258. At idle pinch this line to the canister > closed. If the idle changes, the canister is dead. This line will be > right below the round valve that sits on top of the canister with the > smaller vacuum line going to it. > > Mike > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 > 88 Cherokee 235 BFG AT's - Gone to the rust pile... > Canadian Off Road Trips Photos: Non members can still view! > Jan/06http://www.imagestation.com/album/pictures.html?id=2115147590 > (More Off Road album links at bottom of the view page) Mike, I have no loss of power, it only happens at idle. The filter in the charcoal canister has just been replaced, though it could be the purge valve. Can that be replaced or do I replace the entire canister? Also, what would make the carb whine? It comes and goes but seems to whine more when there is no acceleration, ie. when idling or having reached steady speed. |
Re: 1886 Grand Wagoneer
jimmy3stix@comcast.net wrote:
> On Aug 6, 12:17 pm, Mike Romain <roma...@sympatico.ca> wrote: >> jimmy3s...@comcast.net wrote: >>> Well thanks to the help of this board the Wagoneer is back on the >>> road, albeit a little shaky. I can't seem to get the carb set right. >>> I had a problem with it loping in idle or at stop with transmission in >>> gear. I heard a high pitched whine, and sionc the water pump was >>> leaking I thought that might be the culprit. I replaced it and the >>> fuel pump for good measure. ( I figured with the front disassembled >>> and for a $20 pump, what the hell). Anyway, it turns out the sound >>> wasn't either pump (or the air pump) but seems to be coming from the >>> carburetor, which I recently rebuilt. My question is, could this be >>> caused by a faulty power valve and can I replace that without buying >>> another rebuild kit? >> Loping at idle screams gas tank and carb air vent failure to me. >> >> When the purge valve wears out on the charcoal canister it will cause >> the engine to lope at idle. If the $2.00 air filter on the bottom of >> the charcoal canister is blocked, the carb float bowl and gas tank get >> vacuums on them which can cause loping and a bad loss of top end power >> tot he point of imitating running out of gas. >> >> To check the air filter, just open the gas cap and see how it runs. I >> have seen the idle speeds change instantly that way. >> >> The purge can be checked by tracing the PCV system and finding the line >> that goes to the top of the canister from the intake manifold. It T's >> off behind the carb on the 258. At idle pinch this line to the canister >> closed. If the idle changes, the canister is dead. This line will be >> right below the round valve that sits on top of the canister with the >> smaller vacuum line going to it. >> >> Mike >> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 >> 88 Cherokee 235 BFG AT's - Gone to the rust pile... >> Canadian Off Road Trips Photos: Non members can still view! >> Jan/06http://www.imagestation.com/album/pictures.html?id=2115147590 >> (More Off Road album links at bottom of the view page) > > Mike, > I have no loss of power, it only happens at idle. The filter in the > charcoal canister has just been replaced, though it could be the purge > valve. Can that be replaced or do I replace the entire canister? > Also, what would make the carb whine? It comes and goes but seems to > whine more when there is no acceleration, ie. when idling or having > reached steady speed. > The valve is part of the canister. Pinching off the purge line at idle tells all. The canister is supposed to be off at idle so pinching the line should make no difference. The canister, if blown messes with the carb vacuum big time. That could be part of the noise. Carbs are also very sneaky about coming loose just after a kit... Worth checking. Mike |
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