84 CJ7 Rough Idle
 

OK! I know everyone is thinking idle tubes...but wait!

Here is what is happening:

Had a coolant leak and it was a busted head bolt. Got that problem fix
and then did the Nutter bypass. All was well and good for 2 weeks.
Then all of the sudden it started to miss.

I noticed that the distributor was never tightened back down after the
bypass (it was 'tight' but it wasnt 'tight'). So I grabbed the
handy-dandy timing light to reset the timing hoping the timing had
slipped.

Put on the timing light and no light. Thought maybe the light went
kaput so I borrowed a buddies. Again, nothing. I had checked #1 plug
for spark just a day previous, and there was spark...but not a lot.
Took the coil to be tested. All within spec. Distributor was recently
replaced as were wires & plugs. Wires all test ok. Removed all plugs
and cleaned them.

I was thinking that it may be ignition module blew after the nutter
bypass. Any way to check...or any other ideas to pursue?

PK

Re: 84 CJ7 Rough Idle
 

LOL!

If you check # 2 it also will maybe only flicker and you might get a
light on #3.

That is a classic symptom of those freakin idle tubes!

I chased the whole freaking ignition system on an 85 a couple years ago
for that exact thing.

The clip on timing lights won't see the signal on the bad or no spark on
1, 2 and maybe 3 because the idle tube that feeds those is blocked. I
know the carb is sideways, but the two barrels on the carb like to feed
a half an engine each.

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)

pkaser@gmail.com wrote:
>
> OK! I know everyone is thinking idle tubes...but wait!
>
> Here is what is happening:
>
> Had a coolant leak and it was a busted head bolt. Got that problem fix
> and then did the Nutter bypass. All was well and good for 2 weeks.
> Then all of the sudden it started to miss.
>
> I noticed that the distributor was never tightened back down after the
> bypass (it was 'tight' but it wasnt 'tight'). So I grabbed the
> handy-dandy timing light to reset the timing hoping the timing had
> slipped.
>
> Put on the timing light and no light. Thought maybe the light went
> kaput so I borrowed a buddies. Again, nothing. I had checked #1 plug
> for spark just a day previous, and there was spark...but not a lot.
> Took the coil to be tested. All within spec. Distributor was recently
> replaced as were wires & plugs. Wires all test ok. Removed all plugs
> and cleaned them.
>
> I was thinking that it may be ignition module blew after the nutter
> bypass. Any way to check...or any other ideas to pursue?
>
> PK

Re: 84 CJ7 Rough Idle
 

LOL!

If you check # 2 it also will maybe only flicker and you might get a
light on #3.

That is a classic symptom of those freakin idle tubes!

I chased the whole freaking ignition system on an 85 a couple years ago
for that exact thing.

The clip on timing lights won't see the signal on the bad or no spark on
1, 2 and maybe 3 because the idle tube that feeds those is blocked. I
know the carb is sideways, but the two barrels on the carb like to feed
a half an engine each.

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)

pkaser@gmail.com wrote:
>
> OK! I know everyone is thinking idle tubes...but wait!
>
> Here is what is happening:
>
> Had a coolant leak and it was a busted head bolt. Got that problem fix
> and then did the Nutter bypass. All was well and good for 2 weeks.
> Then all of the sudden it started to miss.
>
> I noticed that the distributor was never tightened back down after the
> bypass (it was 'tight' but it wasnt 'tight'). So I grabbed the
> handy-dandy timing light to reset the timing hoping the timing had
> slipped.
>
> Put on the timing light and no light. Thought maybe the light went
> kaput so I borrowed a buddies. Again, nothing. I had checked #1 plug
> for spark just a day previous, and there was spark...but not a lot.
> Took the coil to be tested. All within spec. Distributor was recently
> replaced as were wires & plugs. Wires all test ok. Removed all plugs
> and cleaned them.
>
> I was thinking that it may be ignition module blew after the nutter
> bypass. Any way to check...or any other ideas to pursue?
>
> PK

Re: 84 CJ7 Rough Idle
 

LOL!

If you check # 2 it also will maybe only flicker and you might get a
light on #3.

That is a classic symptom of those freakin idle tubes!

I chased the whole freaking ignition system on an 85 a couple years ago
for that exact thing.

The clip on timing lights won't see the signal on the bad or no spark on
1, 2 and maybe 3 because the idle tube that feeds those is blocked. I
know the carb is sideways, but the two barrels on the carb like to feed
a half an engine each.

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)

pkaser@gmail.com wrote:
>
> OK! I know everyone is thinking idle tubes...but wait!
>
> Here is what is happening:
>
> Had a coolant leak and it was a busted head bolt. Got that problem fix
> and then did the Nutter bypass. All was well and good for 2 weeks.
> Then all of the sudden it started to miss.
>
> I noticed that the distributor was never tightened back down after the
> bypass (it was 'tight' but it wasnt 'tight'). So I grabbed the
> handy-dandy timing light to reset the timing hoping the timing had
> slipped.
>
> Put on the timing light and no light. Thought maybe the light went
> kaput so I borrowed a buddies. Again, nothing. I had checked #1 plug
> for spark just a day previous, and there was spark...but not a lot.
> Took the coil to be tested. All within spec. Distributor was recently
> replaced as were wires & plugs. Wires all test ok. Removed all plugs
> and cleaned them.
>
> I was thinking that it may be ignition module blew after the nutter
> bypass. Any way to check...or any other ideas to pursue?
>
> PK

Re: 84 CJ7 Rough Idle
 

I checked the masterbation valve too inside the spark plug plumbing.
It was stuck too.

Re: 84 CJ7 Rough Idle
 

I checked the masterbation valve too inside the spark plug plumbing.
It was stuck too.

Re: 84 CJ7 Rough Idle
 

I checked the masterbation valve too inside the spark plug plumbing.
It was stuck too.

Re: 84 CJ7 Rough Idle
 

Wait a second...are you serious!?!?!

Re: 84 CJ7 Rough Idle
 

Wait a second...are you serious!?!?!

Re: 84 CJ7 Rough Idle
 

Wait a second...are you serious!?!?!