92XJGuy

Quick question, guys. Could this be a back pressure related issue? I was out wheeling today, and the weather was low 60s and cloudy. Didn't have a single sputter issue (and haven't for the last 2 weeks since the weather has been chilly), and the sun came out and got hotter and the sputtering happened. Then got cloudy and went back to normal. My buddies think it's a back pressure issue. My state doesn't require emission testing for vehicles before 95, and I'm a 92. So I'm just running a glasspack (which I don't condone). Could the temperature be playing a factor in this? I have not had the time to do my tune up, since I don't really have an area that isn't a parking lot in the city, and I'm dragging my feet on having a shop do it.


Let me know.

1990xj2d

Just a heads up I changed my o2 and coolant temp sensor and fixed my vacuum line to my map sensor now the jeep is running smoother than ever... Cant wait to install my 703's and see even more of a change

Disoriented Hillbilly

Good to hear!

92XJGuy

Any other thoughts on it being exhaust related? I modified my exhaust back when my muffler and catalytic fell off (due to my driveshaft u joint breaking) back in December. And up until a few weeks ago, we didn't have warm weather. For one week, we were in the 80s, and the issued started. Since there's really nothing except the glasspack, which is pretty much hollow, could that be part of it? Should I upgrade to a muffler? (Like a Flow Super 44?)

ZINGGG

I'll stand by what I've saying all along. A tune up (plugs, wires, cap, rotor, fuel and air filter, and upstream o2 sensor) is absolutely, 100% necessary and is the cause of sputtering 9/10 times. Oh and do the coil since you have a new one sitting around. Shoot, since you don't have a place to work at home, I'd grab some tools and go to a Walmart parking lot. These repairs are a LOT easier to do and cheaper than redoing your exhaust. I don't think your problem lies in your exhaust (although a clogged cat could cause it to sputter)

92XJGuy

I agree, but the issue hasn't happened since the weather got colder. And it only happened once yesterday when I was wheeling, and that was when the sun came out around lunch for a half hour, then after that it went back to low 60s/cloudy. Also, I'd just be replacing my glasspack with a muffler. About a $60 upgrade. And I've been implying it, but I think I'll just say it, although I'll get in trouble, but I need to know if it's part of my issue. I'm running straight pipe with no cat, since it fell off when my driveshaft ujoint broke. My exhaust is just pipe with a glasspack that's hollow. I don't have back pressure, right?


Thanks

CPCP-94XJ

Dude, just do the simple tune up first... its the cheapest thing you can do at this point and it probably needs one regardless. take your parts with you the next time you go wheel, some simple tools and do it in the bush, no worries about parking it in someones DW, it will take like a half hour if you kinda know what you are doing. I dont mean to but in here but you keep asking for help and making more suggestions while 96XJSPORT is trying to help. Anything and everything can be realted to engined problems, and you can convince yourself of anything as well haha but doing it one step at a time is the only way at this point, and starting with the cheapest is the smartest way to go. Do the tune up and keep us posted, i may have the same issue but my plugs / cap and wires are fine, im looking for 703's now

92XJGuy

Thanks for the advice! I'm definitely not discounting the tune up, I know it needs one regardless. I'm just iffy since the issue stops when the weather is cold. And I just got hot weather for a week for the first time with my straight pipe. If I was having the issue constantly, I'd say tune up hands down. And when the sputtering happens, it happens for like 5-10 minutes, then goes away and might not happen again. But only when the weather is hot.

Thanks for everything so far everyone! Appreciate it!

92XJGuy

Hey guys, sorry for no update. Just started getting warmer weather. Good news is it appears to be gone! I've switched the plugs and added a catalytic converter. We've had a few days in the mid 70s, and I went wheeling this past weekend, and not one pop or sputter!

AustinHomonek

Mine will do the same thing, although if i turn my head lights off (HIDS) it will run fine. I know my cause is the alternator dropping out. Just dosent have enough power to fire my coil and run my head lights and radio. when i first start my 89 it will charge at 13.5 volts, as soon as i put a load on my alternator it drops to under 9 volts.

ZINGGG

Glad to hear it. I had a feeling that it was tune-up related... Did you change the spark plug wires and distributor cap and rotor when you did the plugs? It would have been good for safe keeping.

92XJGuy

So I had fixed this issue a while ago back when I installed a cat. And since then it's been fine. No issue in really hot weather or chilly weather. But last night, I was driving home in the rain, and I had 4H on, and after about 30 minutes of driving, at a stop light my jeep sounds like it's about to die, it was sputtering. I would accelerate, and I wouldn't be able to accelerate much. It came and went.

My temperature gauge sits to the left of 212, closer to the middle, like 160 or so. And it has been since I added hood vents, fan shroud, and eliminated my HCV. I have my electric fan on a switch, and in the colder weather I don't turn it on. I had it off until this issue started happening, turned it on and it went away, but I turned it on like 10 minutes from home. And I don't know if it's anything, but as soon as this issue started happening, my part time light came on. After having been driving in 4H for 20+ minutes. Also, my o2 sensor broke months ago, and I have a new one, but haven't replaced it yet, mainly because nothing has been happening. No CEL, mpg seems normal, think it could be related?



Any ideas on what this could be?

92XJGuy

Driving home again in the freezing cold after the Jeep sat outside for a little while. Whole way from home from my buddy's house (20 minutes) I was having major sputtering issues when accelerating. I had to keep flooring it to remain moving. Then my gauge lights started to dim lol. I haven't plugged my hood vents, and freezing rain could have gotten on my distributor.. which doesn't have any dielectric. Or could be alternator related. I think I'm running a Duralast lol. Oh, I also just hit 140k miles! lol

JeepsAreForSpeed

look at your map sensor vacuum line it should have a little skinny plastic check valve in it by the intake manifold mine did that too on hard acceleration. was about a one minute fix. must have something to do with the map sensor not adjusting quick enough to give it more gas because the valve went bad or blocked up or somethin.

92XJGuy

I had a similar issue over the summer, but that was when I wasn't running a cat or muffler, and only happened in hot heat. Went away after I got a cat. Came back in the chilly cold lol. Should I just buy a new map sensor? Will it come with a new line as well? Also, what's the install process like?

Cheers

Edit: Apparently I can get a new vacuum line from AutoZone. It's labeled as an "emission hose" though.