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General Forums => The Mess Hall => Topic started by: fobanger00 on February 21, 2012, 10:11:44 PM

Title: lopeing?
Post by: fobanger00 on February 21, 2012, 10:11:44 PM
jeep lopes like it has a cam, i use 93 oct gas and i thought it was the fuel filter so i used the fuel filter cleaner almost everytime i gas up when getting a half tank or more.  doesnt help or solve the problem.  the throttle body seems clean also, no one can tell me what the problem is, it never happens when i bring it to get looked at.  does it more when its cold but also does it when its warmed up. rather random when it happens but im seeing if anyone else had this problem?
Title: Re: lopeing?
Post by: sharpxmen on February 21, 2012, 11:33:51 PM
jeep lopes like it has a cam, i use 93 oct gas and i thought it was the fuel filter so i used the fuel filter cleaner almost everytime i gas up when getting a half tank or more.  doesnt help or solve the problem.  the throttle body seems clean also, no one can tell me what the problem is, it never happens when i bring it to get looked at.  does it more when its cold but also does it when its warmed up. rather random when it happens but im seeing if anyone else had this problem?

what does lopeing or lope means? why do you use 93 octane btw?
Title: Re: lopeing?
Post by: grumpygy on February 22, 2012, 06:48:16 AM
If you thought it was the fuel filter why not change it.
Title: Re: lopeing?
Post by: FourbangerYJ on February 22, 2012, 08:29:48 AM
what does lopeing or lope means? why do you use 93 octane btw?

Having a very large lift/duration cam will cause the motor to lope...it will not idle smooth at lower RPM's.
Title: Re: lopeing?
Post by: sharpxmen on February 22, 2012, 08:42:07 AM
is it going up and down in rpm?
if yes then my guess is one of the following: too rich, an injector squirting or not spraying constantly, the O2 sensor, the TPS or
some misfire or for some reason the engine is about to die and the PCM is opening the IAT to prevent that and the cycle repeats

any codes/CEL?
Title: Re: lopeing?
Post by: fobanger00 on February 22, 2012, 12:23:08 PM
fuel filter is in the gas tank attached to some computer and remember hearing it was exspensive, lopeing is like what a diesel does when you cam it, to me it feels like the engine is jumping out of the jeep, and it almost stalls but it wot, the rpms go from below 500 to just under 1000.
Title: Re: lopeing?
Post by: sharpxmen on February 22, 2012, 01:00:18 PM
start with checking the fuel pressure and go from there. If it's that bad i would expect a CEL Code so if that is the case check and report back.
Title: Re: lopeing?
Post by: Jeffy on February 22, 2012, 06:54:04 PM
what does lopeing or lope means? why do you use 93 octane btw?

Having a very large lift/duration cam will cause the motor to lope...it will not idle smooth at lower RPM's.
Lobe'ing comes from Cam Lobe nut not necessary the actual cam shaft lobe.  It's the heavy uneven idle an engine may exhibit.

The first thing to do is check the ECM for any stored codes.  It might not display a CEL but it still might have codes. Intermittent could mean a sensor is bad but not bad enough to throw a code.  You might also check the spark plus, wires and cap to make sure they're all up to snuff.  A rough idle could mean a missfire.  Although, you should notice a loss in power.
Title: Re: lopeing?
Post by: sharpxmen on February 22, 2012, 07:29:10 PM
i think we need a vroom vroom description 'cause now I'm even more confused... (lopeing, lobeing, caming, etc).
Title: Re: lopeing?
Post by: FourbangerYJ on February 22, 2012, 08:15:53 PM
i think we need a vroom vroom description 'cause now I'm even more confused... (lopeing, lobeing, caming, etc).

http://www.youtube.com/v/KZUfa11TO64?version=3&hl=en_US

This is what comes to mind when someone says they have a lopey cam. This more than likely is running at 1500-2000 RPM at idle. Could be more. Pure music!
Title: Re: lopeing?
Post by: fobanger00 on February 22, 2012, 08:31:08 PM
imagine you start your jeep, and its fine then all of a sudden it sounds like its bucking and close to stalling and engine is shaking, then i rev it a few times and its fine or usually i shut it off then start it up again and it doesnt do it.. no one knows what this is!!!
Title: Re: lopeing?
Post by: fobanger00 on February 22, 2012, 08:32:17 PM
only code showing is my o2 sensor code and this problem has happened since i got the jeep with no problems at all
Title: Re: lopeing?
Post by: fobanger00 on February 22, 2012, 08:33:25 PM
pretty much what that video is doing but quieter, less ballsy, and its not a good thing lol
Title: Re: lopeing?
Post by: sharpxmen on February 22, 2012, 08:33:38 PM
This is what comes to mind when someone says they have a lopey cam. This more than likely is running at 1500-2000 RPM at idle. Could be more. Pure music!

i that's what his does then it could be a sign of too rich (going up and down in rpm at idle) or anti-stalling by the means of IAC (for whatever reason would stall that's another issue).

only code showing is my o2 sensor code and this problem has happened since i got the jeep with no problems at all

that can be a reason of too rich, so replace it.

EDIT: it's so dirt cheap that i can't imagine any reason for not replacing it anyway (got mine for $35 at Amazon).
Title: Re: lopeing?
Post by: fobanger00 on February 23, 2012, 10:46:49 AM
this problem happened before o2 sensor was bad.  i am posting a vid on the facebook page ebcause it is to big to post on here.  if you have time to watch it please do,  you can hear it mostly towards the end when im by the exhaust.  when it does noise i rev it and it stops after a few revs
Title: Re: lopeing?
Post by: sharpxmen on February 23, 2012, 11:57:02 AM
this problem happened before o2 sensor was bad.  i am posting a vid on the facebook page ebcause it is to big to post on here.  if you have time to watch it please do,  you can hear it mostly towards the end when im by the exhaust.  when it does noise i rev it and it stops after a few revs

if you're running with a bad O2 sensor there's no point in trying to troubleshoot any further, fix that first and if it doesn't remediate it then you can look at what else is there. Once you fix your O2 check your spark plugs and related and replace them if needed and go from there, there's no way you're going to get it to run right with the O2 not working properly, it basically runs with whatever fuel trims were learned prior to going bust, if it was sending the wrong info to the PCM before you got the CEL then that's what your fuel injection runs like now so the fact that was doing this before the O2 code does not mean it's unrelated, it might or might not, only thing that is for sure is that your AFR at idle right now is not right since there is no feedback information from the O2 sensor (or wrong information) to the PCM. After you replace it reset the computer (remove the battery ground terminal, touch it on the positive one and leave it off for couple of minutes).
Title: Re: lopeing?
Post by: Jeffy on February 23, 2012, 12:18:53 PM
How's the power when it does that?

https://www.facebook.com/video/video.php?v=2621648191526&oid=308364993424
Title: Re: lopeing?
Post by: fobanger00 on February 23, 2012, 08:28:06 PM
it boggs down when i step on the pedal, then i hafta pull over shut it off turn it on then it fine
Title: Re: lopeing?
Post by: BoringDave on February 23, 2012, 09:00:06 PM
Mine does the same thing when I start it in the morning when it's cold out. Mine has no codes and I've replace plugs,wires,cap,rotor and the 02 sensor. I also Removed and cleaned the throttle body nothing worked as of last time I ever started it. I don't drive mine on the street so I don't much care. But if you figure it out post up so I can fix mine.

Dave
Title: Re: lopeing?
Post by: Jeffy on February 23, 2012, 09:21:33 PM
it boggs down when i step on the pedal, then i hafta pull over shut it off turn it on then it fine
I wonder if all of your injectors are working.  You'll usually get a CEL code but not always.
Title: Re: lopeing?
Post by: sharpxmen on February 23, 2012, 09:25:29 PM
does the CEL going in and out? (lit and not i mean).
Title: Re: lopeing?
Post by: fobanger00 on February 24, 2012, 05:30:20 AM
i feel like its injectors, but my buddy had this happen to his when he had his 2.5l yj and he said it was a clogged cat... this also could be possible on mine
Title: Re: lopeing?
Post by: Jeffy on February 24, 2012, 01:02:58 PM
i feel like its injectors, but my buddy had this happen to his when he had his 2.5l yj and he said it was a clogged cat... this also could be possible on mine
A cat issue wouldn't normally clear up.  Also, you can check it easily by kicking at the exhaust near the cat and listen for loose parts inside.

Is there any change once the engine's warmed up?
Title: Re: lopeing?
Post by: grumpygy on February 24, 2012, 10:37:22 PM
Did it start right after filling up.
Title: Re: lopeing?
Post by: grumpygy on February 25, 2012, 11:48:22 AM
Also have you cleaned the engine area Lately.
Title: Re: lopeing?
Post by: fobanger00 on March 07, 2012, 09:15:27 PM
it does it more when its cold warming up but will do it randomly sometimes when jeep has been warmed up for while. i still havent gotten around to checking anything, vacum lines, injectors, plugs, cat
Title: Re: lopeing?
Post by: jramey on March 17, 2012, 08:29:25 PM
my xj does this same stuff too lol, on first start up and drive when i start going in first it starts cutting out and bogging down, then i just push the clutch in and rev it up a few times then try to go again and that usually clears the rough running up.
Title: Re: lopeing?
Post by: smashcoast on March 18, 2012, 10:01:44 PM
Mine did that for a little bit. I have a 97tj. I just replaced the TPS sensor on the throttle body. And it hasn't done it since. It's a $40 part. Try that it might work. Also get the O2 sensor fixed.