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Re: CJ-5 Heater Fan Upgrade Questions. Now Dead 350 'from' a backfire...
While you are there, a compression test is 'sure' in order too!
The 'Big' problem Anthony is that your reported symptoms 'don't' match the diagnosis. A backfire right out of the blue that stalls a 350 V8 engine is almost always spark related. In order for a 'slight' head leak to stall a 350, one cylinder would likely have to be filled with coolant. When this happens, the piston hits the water like a wall and explodes which usually throws the connecting rod out through the side of the engine just for good measure.... Good luck! 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) Anthony T wrote: > Good Idea SnoMan. I'll give it a try. > > "SnoMan" <admin@snoman.com> wrote in message > news:8ap203l8j97l4mvtfn0gi3nb5kghubo2eu@4ax.com... >> On Wed, 21 Mar 2007 07:38:49 -0700, "Anthony T" <bud@remail-it.net> >> wrote: >> >>> Bad news !!!!! The shop did a block check ($75) and there is exhaust >>> getting into the cooling system. Not much, he's getting a hydrocarbon >>> reading in my radiator/coolant. Mechanic says it's probably not the head >>> gasket, but rather, a cracked head. That's gonna hurt. >> >> >> I think I would do a long term pressure test of cooling sytem (a hour >> or two) to see if there is a internal leak in it. >> ----------------- >> TheSnoMan.com > |
Re: CJ-5 Heater Fan Upgrade Questions. Now Dead 350 'from' a backfire...
While you are there, a compression test is 'sure' in order too!
The 'Big' problem Anthony is that your reported symptoms 'don't' match the diagnosis. A backfire right out of the blue that stalls a 350 V8 engine is almost always spark related. In order for a 'slight' head leak to stall a 350, one cylinder would likely have to be filled with coolant. When this happens, the piston hits the water like a wall and explodes which usually throws the connecting rod out through the side of the engine just for good measure.... Good luck! 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) Anthony T wrote: > Good Idea SnoMan. I'll give it a try. > > "SnoMan" <admin@snoman.com> wrote in message > news:8ap203l8j97l4mvtfn0gi3nb5kghubo2eu@4ax.com... >> On Wed, 21 Mar 2007 07:38:49 -0700, "Anthony T" <bud@remail-it.net> >> wrote: >> >>> Bad news !!!!! The shop did a block check ($75) and there is exhaust >>> getting into the cooling system. Not much, he's getting a hydrocarbon >>> reading in my radiator/coolant. Mechanic says it's probably not the head >>> gasket, but rather, a cracked head. That's gonna hurt. >> >> >> I think I would do a long term pressure test of cooling sytem (a hour >> or two) to see if there is a internal leak in it. >> ----------------- >> TheSnoMan.com > |
Re: CJ-5 Heater Fan Upgrade Questions. Now Dead 350 'from' a backfire...
While you are there, a compression test is 'sure' in order too!
The 'Big' problem Anthony is that your reported symptoms 'don't' match the diagnosis. A backfire right out of the blue that stalls a 350 V8 engine is almost always spark related. In order for a 'slight' head leak to stall a 350, one cylinder would likely have to be filled with coolant. When this happens, the piston hits the water like a wall and explodes which usually throws the connecting rod out through the side of the engine just for good measure.... Good luck! 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) Anthony T wrote: > Good Idea SnoMan. I'll give it a try. > > "SnoMan" <admin@snoman.com> wrote in message > news:8ap203l8j97l4mvtfn0gi3nb5kghubo2eu@4ax.com... >> On Wed, 21 Mar 2007 07:38:49 -0700, "Anthony T" <bud@remail-it.net> >> wrote: >> >>> Bad news !!!!! The shop did a block check ($75) and there is exhaust >>> getting into the cooling system. Not much, he's getting a hydrocarbon >>> reading in my radiator/coolant. Mechanic says it's probably not the head >>> gasket, but rather, a cracked head. That's gonna hurt. >> >> >> I think I would do a long term pressure test of cooling sytem (a hour >> or two) to see if there is a internal leak in it. >> ----------------- >> TheSnoMan.com > |
Re: Re: CJ-5 Heater Fan Upgrade Questions. Now Dead 350 'from' a backfire...
On Fri, 23 Mar 2007 10:10:28 -0400, Mike Romain <romainm@sympatico.ca>
wrote: >A backfire right out of the blue that stalls a 350 V8 engine is almost >always spark related. I would not say that at all because usually it is fuel related if it is through the intake (engine leaning out) ----------------- TheSnoMan.com |
Re: Re: CJ-5 Heater Fan Upgrade Questions. Now Dead 350 'from' a backfire...
On Fri, 23 Mar 2007 10:10:28 -0400, Mike Romain <romainm@sympatico.ca>
wrote: >A backfire right out of the blue that stalls a 350 V8 engine is almost >always spark related. I would not say that at all because usually it is fuel related if it is through the intake (engine leaning out) ----------------- TheSnoMan.com |
Re: Re: CJ-5 Heater Fan Upgrade Questions. Now Dead 350 'from' a backfire...
On Fri, 23 Mar 2007 10:10:28 -0400, Mike Romain <romainm@sympatico.ca>
wrote: >A backfire right out of the blue that stalls a 350 V8 engine is almost >always spark related. I would not say that at all because usually it is fuel related if it is through the intake (engine leaning out) ----------------- TheSnoMan.com |
Re: CJ-5 Heater Fan Upgrade Questions. Now Dead 350 'from' a backfire...
SnoMan wrote:
> On Fri, 23 Mar 2007 10:10:28 -0400, Mike Romain <romainm@sympatico.ca> > wrote: > >> A backfire right out of the blue that stalls a 350 V8 engine is almost >> always spark related. > > > I would not say that at all because usually it is fuel related if it > is through the intake (engine leaning out) > ----------------- > TheSnoMan.com Then you normally talk a series of backfires or 'pops', not one bang and stop that is 'caused' by a slight trace of hydrocarbons in the rad coolant most likely from a cracked head!!!! I would highly recommend as I have said that he check for loose wires at the distributor or coil. He just had some friends all over his firewall area trying to bolt in his heater core. That top center bolt for the heater is really close to things.... He also just had himself and/or friends all under his dash pulling the heater core in and out with the dash in place.... I 'really really' would be looking at wiring, not a blown engine. If you backfire bad enough to crack a head well... I don't see how it can be the cracked head causing the backfire. 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: CJ-5 Heater Fan Upgrade Questions. Now Dead 350 'from' a backfire...
SnoMan wrote:
> On Fri, 23 Mar 2007 10:10:28 -0400, Mike Romain <romainm@sympatico.ca> > wrote: > >> A backfire right out of the blue that stalls a 350 V8 engine is almost >> always spark related. > > > I would not say that at all because usually it is fuel related if it > is through the intake (engine leaning out) > ----------------- > TheSnoMan.com Then you normally talk a series of backfires or 'pops', not one bang and stop that is 'caused' by a slight trace of hydrocarbons in the rad coolant most likely from a cracked head!!!! I would highly recommend as I have said that he check for loose wires at the distributor or coil. He just had some friends all over his firewall area trying to bolt in his heater core. That top center bolt for the heater is really close to things.... He also just had himself and/or friends all under his dash pulling the heater core in and out with the dash in place.... I 'really really' would be looking at wiring, not a blown engine. If you backfire bad enough to crack a head well... I don't see how it can be the cracked head causing the backfire. 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: CJ-5 Heater Fan Upgrade Questions. Now Dead 350 'from' a backfire...
SnoMan wrote:
> On Fri, 23 Mar 2007 10:10:28 -0400, Mike Romain <romainm@sympatico.ca> > wrote: > >> A backfire right out of the blue that stalls a 350 V8 engine is almost >> always spark related. > > > I would not say that at all because usually it is fuel related if it > is through the intake (engine leaning out) > ----------------- > TheSnoMan.com Then you normally talk a series of backfires or 'pops', not one bang and stop that is 'caused' by a slight trace of hydrocarbons in the rad coolant most likely from a cracked head!!!! I would highly recommend as I have said that he check for loose wires at the distributor or coil. He just had some friends all over his firewall area trying to bolt in his heater core. That top center bolt for the heater is really close to things.... He also just had himself and/or friends all under his dash pulling the heater core in and out with the dash in place.... I 'really really' would be looking at wiring, not a blown engine. If you backfire bad enough to crack a head well... I don't see how it can be the cracked head causing the backfire. 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: Re: CJ-5 Heater Fan Upgrade Questions. Now Dead 350 'from' a backfire...
On Fri, 23 Mar 2007 12:17:33 -0400, Mike Romain <romainm@sympatico.ca>
wrote: >Then you normally talk a series of backfires or 'pops', not one bang and >stop that is 'caused' by a slight trace of hydrocarbons in the rad >coolant most likely from a cracked head!!!! Not always because depending on the reason for the lean out when the engine missfired and back fires it looses power and required fuel flow so demand for it decreases and it may run alright for a bit afterwards when it recovers. Also something this backfire can occur when there is a throttle change and enrichment lags enough to cause the "pop" from lean out. This iis not to say it could not be ignition but more often than not when it spits through intake it is from leanout under load or engine acceleration. ----------------- TheSnoMan.com |
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