Re: CJ7 "missing" at highway speeds or under load - HELP!!
 

Shadow wrote:
> I have an 85 CJ7 that has developed a nasty habit of missing extremely
> bad at highway speeds or when pulling a utility trailer (when the
> engine is hot). I have replaced the plugs, coil, dist. cap & rotor,
> and control module - all of which produced nothing except a much
> lighter wallet. The fuel filter is only about 1 year old.
>
> NOW for the manifold leak. It has had an exhaust manifold leak for
> some time (I know I need to address that issue also). The issue
> (missing) started after I drove the jeep 6 hours to the beach, (so I
> could run it on the sand) all week at the beach, and did not have a
> problem - until 30 minutes into the return trip. It seemed as soon as
> I let the engine cool off, I could go about 60 miles until it started
> acting up. Since then it has gotten much worse. I can drive it around
> town and it seems OK until I hit the highway.
>
> All of this said I started thinking that I might have a burnt valve
> caused by the manifold leak, but I wanted some other opinions before I
> pulled the head.
>
> Any help would be great, because I would really like to get the "Green
> Goblin" back on the road.
> Thanks.
>


Possibly you are running very lean. The plug condition can tell you a
lot when you take them out. Under ideal circumstances, your plugs should
be colored a light tan color. If they are perfectly white, and/or have
little silver specks on them, your engine is running extremely lean.

This could be caused from low fuel pressure, low float level, or
possibly something getting plugged up in the carb.

One other thing. If you haven't done it yet, you might want to look in
to doing the Nutter Bypass. It will improve things very nicely.

Here is the how-to article:
http://www.4x4wire.com/jeep/tech/ele...jn-ignition99/

Chris

Re: CJ7 "missing" at highway speeds or under load - HELP!!
 

Shadow wrote:
> I have an 85 CJ7 that has developed a nasty habit of missing extremely
> bad at highway speeds or when pulling a utility trailer (when the
> engine is hot). I have replaced the plugs, coil, dist. cap & rotor,
> and control module - all of which produced nothing except a much
> lighter wallet. The fuel filter is only about 1 year old.
>
> NOW for the manifold leak. It has had an exhaust manifold leak for
> some time (I know I need to address that issue also). The issue
> (missing) started after I drove the jeep 6 hours to the beach, (so I
> could run it on the sand) all week at the beach, and did not have a
> problem - until 30 minutes into the return trip. It seemed as soon as
> I let the engine cool off, I could go about 60 miles until it started
> acting up. Since then it has gotten much worse. I can drive it around
> town and it seems OK until I hit the highway.
>
> All of this said I started thinking that I might have a burnt valve
> caused by the manifold leak, but I wanted some other opinions before I
> pulled the head.
>
> Any help would be great, because I would really like to get the "Green
> Goblin" back on the road.
> Thanks.
>


Possibly you are running very lean. The plug condition can tell you a
lot when you take them out. Under ideal circumstances, your plugs should
be colored a light tan color. If they are perfectly white, and/or have
little silver specks on them, your engine is running extremely lean.

This could be caused from low fuel pressure, low float level, or
possibly something getting plugged up in the carb.

One other thing. If you haven't done it yet, you might want to look in
to doing the Nutter Bypass. It will improve things very nicely.

Here is the how-to article:
http://www.4x4wire.com/jeep/tech/ele...jn-ignition99/

Chris

Re: CJ7 "missing" at highway speeds or under load - HELP!!
 

Shadow wrote:
> I have an 85 CJ7 that has developed a nasty habit of missing extremely
> bad at highway speeds or when pulling a utility trailer (when the
> engine is hot). I have replaced the plugs, coil, dist. cap & rotor,
> and control module - all of which produced nothing except a much
> lighter wallet. The fuel filter is only about 1 year old.
>
> NOW for the manifold leak. It has had an exhaust manifold leak for
> some time (I know I need to address that issue also). The issue
> (missing) started after I drove the jeep 6 hours to the beach, (so I
> could run it on the sand) all week at the beach, and did not have a
> problem - until 30 minutes into the return trip. It seemed as soon as
> I let the engine cool off, I could go about 60 miles until it started
> acting up. Since then it has gotten much worse. I can drive it around
> town and it seems OK until I hit the highway.
>
> All of this said I started thinking that I might have a burnt valve
> caused by the manifold leak, but I wanted some other opinions before I
> pulled the head.
>
> Any help would be great, because I would really like to get the "Green
> Goblin" back on the road.
> Thanks.
>


Possibly you are running very lean. The plug condition can tell you a
lot when you take them out. Under ideal circumstances, your plugs should
be colored a light tan color. If they are perfectly white, and/or have
little silver specks on them, your engine is running extremely lean.

This could be caused from low fuel pressure, low float level, or
possibly something getting plugged up in the carb.

One other thing. If you haven't done it yet, you might want to look in
to doing the Nutter Bypass. It will improve things very nicely.

Here is the how-to article:
http://www.4x4wire.com/jeep/tech/ele...jn-ignition99/

Chris

Re: CJ7 "missing" at highway speeds or under load - HELP!!
 

I would replace the fuel filter, it is due.

I go through one or more a year when using my CJ off road. The dust and
dirt collects under the cap and some goes in every time I add fuel.

I always carry a spare even.

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)

Shadow wrote:
> I have an 85 CJ7 that has developed a nasty habit of missing extremely
> bad at highway speeds or when pulling a utility trailer (when the
> engine is hot). I have replaced the plugs, coil, dist. cap & rotor,
> and control module - all of which produced nothing except a much
> lighter wallet. The fuel filter is only about 1 year old.
>
> NOW for the manifold leak. It has had an exhaust manifold leak for
> some time (I know I need to address that issue also). The issue
> (missing) started after I drove the jeep 6 hours to the beach, (so I
> could run it on the sand) all week at the beach, and did not have a
> problem - until 30 minutes into the return trip. It seemed as soon as
> I let the engine cool off, I could go about 60 miles until it started
> acting up. Since then it has gotten much worse. I can drive it around
> town and it seems OK until I hit the highway.
>
> All of this said I started thinking that I might have a burnt valve
> caused by the manifold leak, but I wanted some other opinions before I
> pulled the head.
>
> Any help would be great, because I would really like to get the "Green
> Goblin" back on the road.
> Thanks.
>

Re: CJ7 "missing" at highway speeds or under load - HELP!!
 

I would replace the fuel filter, it is due.

I go through one or more a year when using my CJ off road. The dust and
dirt collects under the cap and some goes in every time I add fuel.

I always carry a spare even.

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)

Shadow wrote:
> I have an 85 CJ7 that has developed a nasty habit of missing extremely
> bad at highway speeds or when pulling a utility trailer (when the
> engine is hot). I have replaced the plugs, coil, dist. cap & rotor,
> and control module - all of which produced nothing except a much
> lighter wallet. The fuel filter is only about 1 year old.
>
> NOW for the manifold leak. It has had an exhaust manifold leak for
> some time (I know I need to address that issue also). The issue
> (missing) started after I drove the jeep 6 hours to the beach, (so I
> could run it on the sand) all week at the beach, and did not have a
> problem - until 30 minutes into the return trip. It seemed as soon as
> I let the engine cool off, I could go about 60 miles until it started
> acting up. Since then it has gotten much worse. I can drive it around
> town and it seems OK until I hit the highway.
>
> All of this said I started thinking that I might have a burnt valve
> caused by the manifold leak, but I wanted some other opinions before I
> pulled the head.
>
> Any help would be great, because I would really like to get the "Green
> Goblin" back on the road.
> Thanks.
>

Re: CJ7 "missing" at highway speeds or under load - HELP!!
 

I would replace the fuel filter, it is due.

I go through one or more a year when using my CJ off road. The dust and
dirt collects under the cap and some goes in every time I add fuel.

I always carry a spare even.

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)

Shadow wrote:
> I have an 85 CJ7 that has developed a nasty habit of missing extremely
> bad at highway speeds or when pulling a utility trailer (when the
> engine is hot). I have replaced the plugs, coil, dist. cap & rotor,
> and control module - all of which produced nothing except a much
> lighter wallet. The fuel filter is only about 1 year old.
>
> NOW for the manifold leak. It has had an exhaust manifold leak for
> some time (I know I need to address that issue also). The issue
> (missing) started after I drove the jeep 6 hours to the beach, (so I
> could run it on the sand) all week at the beach, and did not have a
> problem - until 30 minutes into the return trip. It seemed as soon as
> I let the engine cool off, I could go about 60 miles until it started
> acting up. Since then it has gotten much worse. I can drive it around
> town and it seems OK until I hit the highway.
>
> All of this said I started thinking that I might have a burnt valve
> caused by the manifold leak, but I wanted some other opinions before I
> pulled the head.
>
> Any help would be great, because I would really like to get the "Green
> Goblin" back on the road.
> Thanks.
>

Re: CJ7 "missing" at highway speeds or under load - HELP!!
 

I would replace the fuel filter, it is due.

I go through one or more a year when using my CJ off road. The dust and
dirt collects under the cap and some goes in every time I add fuel.

I always carry a spare even.

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)

Shadow wrote:
> I have an 85 CJ7 that has developed a nasty habit of missing extremely
> bad at highway speeds or when pulling a utility trailer (when the
> engine is hot). I have replaced the plugs, coil, dist. cap & rotor,
> and control module - all of which produced nothing except a much
> lighter wallet. The fuel filter is only about 1 year old.
>
> NOW for the manifold leak. It has had an exhaust manifold leak for
> some time (I know I need to address that issue also). The issue
> (missing) started after I drove the jeep 6 hours to the beach, (so I
> could run it on the sand) all week at the beach, and did not have a
> problem - until 30 minutes into the return trip. It seemed as soon as
> I let the engine cool off, I could go about 60 miles until it started
> acting up. Since then it has gotten much worse. I can drive it around
> town and it seems OK until I hit the highway.
>
> All of this said I started thinking that I might have a burnt valve
> caused by the manifold leak, but I wanted some other opinions before I
> pulled the head.
>
> Any help would be great, because I would really like to get the "Green
> Goblin" back on the road.
> Thanks.
>

Re: CJ7 "missing" at highway speeds or under load - HELP!!
 

It's odd that while you were gone, a lot of the stuff that I knew you
had experience with came up. I answered the ones I could but figured you
would have some better input on some of them. I wasn't an epic
substitute for you however, since I did not recommend that anyone check
the ground strap at the back of the engine. Sorry. :-)

Chris


Mike Romain wrote:
> I would replace the fuel filter, it is due.
>
> I go through one or more a year when using my CJ off road. The dust and
> dirt collects under the cap and some goes in every time I add fuel.
>
> I always carry a spare even.
>
> 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)
>
> Shadow wrote:
>> I have an 85 CJ7 that has developed a nasty habit of missing extremely
>> bad at highway speeds or when pulling a utility trailer (when the
>> engine is hot). I have replaced the plugs, coil, dist. cap & rotor,
>> and control module - all of which produced nothing except a much
>> lighter wallet. The fuel filter is only about 1 year old.
>>
>> NOW for the manifold leak. It has had an exhaust manifold leak for
>> some time (I know I need to address that issue also). The issue
>> (missing) started after I drove the jeep 6 hours to the beach, (so I
>> could run it on the sand) all week at the beach, and did not have a
>> problem - until 30 minutes into the return trip. It seemed as soon as
>> I let the engine cool off, I could go about 60 miles until it started
>> acting up. Since then it has gotten much worse. I can drive it around
>> town and it seems OK until I hit the highway.
>>
>> All of this said I started thinking that I might have a burnt valve
>> caused by the manifold leak, but I wanted some other opinions before I
>> pulled the head.
>>
>> Any help would be great, because I would really like to get the "Green
>> Goblin" back on the road.
>> Thanks.
>>
>

Re: CJ7 "missing" at highway speeds or under load - HELP!!
 

It's odd that while you were gone, a lot of the stuff that I knew you
had experience with came up. I answered the ones I could but figured you
would have some better input on some of them. I wasn't an epic
substitute for you however, since I did not recommend that anyone check
the ground strap at the back of the engine. Sorry. :-)

Chris


Mike Romain wrote:
> I would replace the fuel filter, it is due.
>
> I go through one or more a year when using my CJ off road. The dust and
> dirt collects under the cap and some goes in every time I add fuel.
>
> I always carry a spare even.
>
> 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)
>
> Shadow wrote:
>> I have an 85 CJ7 that has developed a nasty habit of missing extremely
>> bad at highway speeds or when pulling a utility trailer (when the
>> engine is hot). I have replaced the plugs, coil, dist. cap & rotor,
>> and control module - all of which produced nothing except a much
>> lighter wallet. The fuel filter is only about 1 year old.
>>
>> NOW for the manifold leak. It has had an exhaust manifold leak for
>> some time (I know I need to address that issue also). The issue
>> (missing) started after I drove the jeep 6 hours to the beach, (so I
>> could run it on the sand) all week at the beach, and did not have a
>> problem - until 30 minutes into the return trip. It seemed as soon as
>> I let the engine cool off, I could go about 60 miles until it started
>> acting up. Since then it has gotten much worse. I can drive it around
>> town and it seems OK until I hit the highway.
>>
>> All of this said I started thinking that I might have a burnt valve
>> caused by the manifold leak, but I wanted some other opinions before I
>> pulled the head.
>>
>> Any help would be great, because I would really like to get the "Green
>> Goblin" back on the road.
>> Thanks.
>>
>

Re: CJ7 "missing" at highway speeds or under load - HELP!!
 

It's odd that while you were gone, a lot of the stuff that I knew you
had experience with came up. I answered the ones I could but figured you
would have some better input on some of them. I wasn't an epic
substitute for you however, since I did not recommend that anyone check
the ground strap at the back of the engine. Sorry. :-)

Chris


Mike Romain wrote:
> I would replace the fuel filter, it is due.
>
> I go through one or more a year when using my CJ off road. The dust and
> dirt collects under the cap and some goes in every time I add fuel.
>
> I always carry a spare even.
>
> 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)
>
> Shadow wrote:
>> I have an 85 CJ7 that has developed a nasty habit of missing extremely
>> bad at highway speeds or when pulling a utility trailer (when the
>> engine is hot). I have replaced the plugs, coil, dist. cap & rotor,
>> and control module - all of which produced nothing except a much
>> lighter wallet. The fuel filter is only about 1 year old.
>>
>> NOW for the manifold leak. It has had an exhaust manifold leak for
>> some time (I know I need to address that issue also). The issue
>> (missing) started after I drove the jeep 6 hours to the beach, (so I
>> could run it on the sand) all week at the beach, and did not have a
>> problem - until 30 minutes into the return trip. It seemed as soon as
>> I let the engine cool off, I could go about 60 miles until it started
>> acting up. Since then it has gotten much worse. I can drive it around
>> town and it seems OK until I hit the highway.
>>
>> All of this said I started thinking that I might have a burnt valve
>> caused by the manifold leak, but I wanted some other opinions before I
>> pulled the head.
>>
>> Any help would be great, because I would really like to get the "Green
>> Goblin" back on the road.
>> Thanks.
>>
>