sluggish, spitting, no power under load.. issues

[shayne54]

Hi! new to the forum, I have an 84 CJ7 that sat by the ocean for 7 years. I rebuilt the carb which helped, it has the YFA-c1 Carter. My new issue seems to be ignition related. When cold, it runs PERFECT. Fuel delivery is right, timing is good, but once it gets to run temp it sputters and kicks, and bucks.... no power at all..
I am thinking it is the coil, any input would be great... The choke is operating just fine.

I can't think of anything else it could be. no arcing plug wires, new cap and dizzy cap... tried many things with the carb, but it runs so well when cold that I dont think thats it..

help!

 

[Torxhead]

Componets to consider in the ignition area would be the ignition control module, like does it get warm to the touch when it starts running crappy? There is a pick up coil in the distributor and the ignition coil that should be checked also.

 

[Hedgehog]

Is your muffler in good shape? I've seen the guts of a muffler come loose and block the exhaust flow.

When the engine is hot the choke is open (normal fuel, neither rich or lean), cold, it's closed (over all the engine is running rich). You might be right about the problem being electronic, but it still could be fuel related. Warm the jeep up and manually close or partially close the choke. Your main jet and accelerator pump could have a problem of some kind.

 

[Shayne54G]

Componets to consider in the ignition area would be the ignition control module, like does it get warm to the touch when it starts running crappy? There is a pick up coil in the distributor and the ignition coil that should be checked also.

sorry for the late response, for some reason my password to log in didn't work, nor did my reset password... very strange, I had to create an entire new account. ... .. I will check the control module today. One thing I forgot to mention was that I was troubleshooting yesterday and out of no where the battery went flat dead. I charged it up and it seems fine now but I thought that was really weird.

Hedgehog:
I will try that, I pulled the carb apart again yesterday to check the accelerator pump because I once had a problem with a tear in the diaphragm but it all looks just great... I will mess with the choke manually as you suggested because it does make this strange air sucking sound.. i checked for manifold leaks or leaks at the base of the carb..

The exhaust is old but not that bad other than a small hole in the down pipe, that being said it did SIT for 6-7 years and was never run so what it looks like inside is another story. plugs are new, diz cap new, fuel lines new, alternator new, battery new....

that is all i can think of.... hopefully I will be able to log back in under this account... I am not getting the confirmation emails and the ability to email the admin is disabled...

thanks

Shayne

 

[Hedgehog]

Carbs are tricky beasts. Sometimes it's best to just "bite the bullet" and find a carburetor man to rebuild yours. The problem is finding a good carb. guy these days.


...... and of course it could be dodgy fuel pressure.

 

[Scooter402]

Carbs are tricky beasts. Sometimes it's best to just "bite the bullet" and find a carburetor man to rebuild yours. The problem is finding a good carb. guy these days.


...... and of course it could be dodgy fuel pressure.

That one was my thought...or a fuel line too close to exhaust, and getting vapor locked due to boiling the fuel before it gets to the bowl. I had a similar issue with my CJ (when it still had Jeep parts in it) years ago -- ran great cold, ran like crud warm. Had to keep your foot in it to keep it running. Didn't have a lack of power though. Rebuilt the carb, and all my woes went away.

 

[Neuner]

Been seeing a lot of newbies come on board only to leave after creating a second account and not wanting to repeat the process. Guess it will never get fixed and we'll have to start a RIP thread as us regular members ride off into the great blue yonder.

 

[hdgapeach]

Been seeing a lot of newbies come on board only to leave after creating a second account and not wanting to repeat the process. Guess it will never get fixed and we'll have to start a RIP thread as us regular members ride off into the great blue yonder.

Ain't that the truth!!? Membership numbers would be a lot higher if the "syndrome" was rectified.

 

[tarry99]

Hi! new to the forum, I have an 84 CJ7 that sat by the ocean for 7 years. I rebuilt the carb which helped, it has the YFA-c1 Carter. My new issue seems to be ignition related. When cold, it runs PERFECT. Fuel delivery is right, timing is good, but once it gets to run temp it sputters and kicks, and bucks.... no power at all..
I am thinking it is the coil, any input would be great... The choke is operating just fine.

I can't think of anything else it could be. no arcing plug wires, new cap and dizzy cap... tried many things with the carb, but it runs so well when cold that I dont think thats it..

help!

Check your tank and carb vents......... loosen your gas cap when it starts to run badly.......if you have not already done so flush the tank and change the fuel filter.........sat for 7 years? whatever fuel was left in it is no good and may have morphed to varnish , notwithstanding rust from sitting , bad fuel smells bad, sounds more like it's running out of fuel , pulling a vacuum or picking up garbage at the fuel pickup in the tank.

 

[shayne54h]

Hey Guys,

Profile #3... by the sound of it, its epidemic... thats too bad.. Anyway, ignition module was running hot.... but i waited until it started acting up to switch it, and it made a huge difference... but then just today it started acting... well sputtery.. not nearly as bad however.. I had already rerouted the gas line as i was concerned that may have been an issue... I rebuilt the card 3 times, and I wish I could tell you how awesome it runs when it is "cold" I mean its a good 20-25 min that its great, unfortunately I drive it to work and that is about 45 min... just driving around town it is great as it never gets warm... I think no the sputter could just be the ignition coil. I mean hell, its the only thing that isn't new... haha... I wish I could just be like all the normal people out there and like driving a honda..

life would be much easier...

I really think I have the carb dialed.. maybe Im being overly confident but fuel pressure is good, i think its spark.. I CAN improve the problem a little by dialing down the mixture (less fuel) but then of course i get an occasional cough out of the carb..

I will give the other suggestions a try, but I also will have a new coil in the am so Ill give that a shot... its weird because the module DID make a difference for awhile... strange.

I won't abandon the post even if it requires 10 new user accounts.


thanks again for all the input guys, it is really appreciated.

 

[shayne54h]

about the gas, when I got it is smelled terrible, tank was newER... I dropped it, replaced the sending unit, replaced the lines and rebuild the carb... new fuel pump & filter.... the reason the jeep was dead to begin with was actually the mechanical fuel pump..

electrical parts replaced: battery,alternator, cap &rotor, ignition module, plugs....

just fyi

for reasons i can't quite pinpoint the battery died 2 times.... Im not sure if the 2 are related.

 

[Neuner]

It's so hard to diagnose those symptoms. I know because I did it and read a lot about others having the same while trying to pinpoint mine. Seemed like there was a different solution for every different situation which was even more aggravating.

If I can, would like to provide this - most of my problems were from the $#!^ ICUs. I tried and exchanged several of them before finding one that worked correctly. The erroneous ones were heat affected. Finally got a BWD Select version that worked great and cured most of the issues.

As already noted, there can also be so many other things. Like the carb which was suggested earlier. Depending on how your choke operates, if it's not set correctly, the engine can run differently when cold/hot, etc. Chasing a rabbit down the rabbit hole sucks.

 

[Torxhead]

For that ignition control module, they can be bad even right out of the box. I do consider when they are warm, it means it is bad and the missing in the ignition will only get worse. A poor ground will destroy one. They are grounded thru the black wire from it. This wire normally runs from the icm to the distributor, where it is supposed to make a ground connection at the engine block. A better bet would be to run that black wire from the icm straight to the battery negative post. It also sounds like there is a short to the battery which is draining the battery. With a computer run CJ there should only be a very slight battery drain of something like 10 milliamps. Come to think of it, you might want to pull a spark plug and see how it is burning, like is it running too rich or lean.

 

[ttuseth2]

For the login problem, download the tapatalk app on your phone and use any of the 3 username and password combinations you have created already.
I can't get in via the cpu but have been doing everything via the app on my phone.


Sent from my SCH-I605 using Tapatalk

 

[mriplaybass]

I have heard that new members are able to log in with tapa talk without resetting everything. Might be worth a try.