Engine surge..
#1
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Year: 2001
Model: Cherokee
Engine: 2.5 turbo Diesel
Engine surge..
Hi guys have a 2000 xj 4.0 classic,having an engine surge problem,on the highway at 50mph rev counter drops and raises,causing down and upshifts ,i had a problem like this a few weeks back and traced it to a vacuum pipe off the inlet manifold,replaced it and all was well.Cant solve this one and its driving me nuts,today i sprayed carb cleaner around the manifold but couldnt find a leak,so could it be something else? would really appreciate some advice...
#2
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Year: 1998 Sport
Model: Cherokee
Engine: 4.0
The first thing you should do is get it scanned to see if it is putting out any code or if it has any codes stored. That would at least give you someplace to start.
#3
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Year: 2001
Model: Cherokee
Engine: 2.5 turbo Diesel
Scanned
Thanks for the reply,Scanned? can you explain that to me,and where do i see the codes? just getting to know this truck bit by bit so sorry for my ignorance..
#4
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If the check engine light is on, the orange engine shaped light on the dash, then that means the ECU has detected a fault of some sort. Most auto parts stores (Autozone, Advance, etc.) will plug in a code scanner, and read the info from the ECU to tell you what caused that fault (or a general idea anyway).
edit: sometimes it's NOT on, and the ECU stores the codes. Check it anyways.
Does the engine do this at any other speed? Try having the transmission in "3" instead of "D" and see if it does it still.
edit: sometimes it's NOT on, and the ECU stores the codes. Check it anyways.
Does the engine do this at any other speed? Try having the transmission in "3" instead of "D" and see if it does it still.
Last edited by ThatAintStock00; 05-30-2013 at 03:20 PM.
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Year: 2001
Model: Cherokee
Engine: 2.5 turbo Diesel
If the check engine light is on, the orange engine shaped light on the dash, then that means the ECU has detected a fault of some sort. Most auto parts stores (Autozone, Advance, etc.) will plug in a code scanner, and read the info from the ECU to tell you what caused that fault (or a general idea anyway).
Does the engine do this at any other speed? Try having the transmission in "3" instead of "D" and see if it does it still.
Does the engine do this at any other speed? Try having the transmission in "3" instead of "D" and see if it does it still.
#7
Member
I would take the transmission of the equation now. I'm still thinking a torque converter issue MAYBE...
If you have a smartphone, maybe make a small video and post it up to youtube for some visual reference.
Aside from a vacuum leak, which when the engine revs (from the extra air) that tells the transmission to downshift. Perhaps the TV cable is loose or out of adjustment?? Or even the throttle cable.
If you have a smartphone, maybe make a small video and post it up to youtube for some visual reference.
Aside from a vacuum leak, which when the engine revs (from the extra air) that tells the transmission to downshift. Perhaps the TV cable is loose or out of adjustment?? Or even the throttle cable.
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#8
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Year: 2001
Model: Cherokee
Engine: 2.5 turbo Diesel
I would take the transmission of the equation now. I'm still thinking a torque converter issue MAYBE...
If you have a smartphone, maybe make a small video and post it up to youtube for some visual reference.
Aside from a vacuum leak, which when the engine revs (from the extra air) that tells the transmission to downshift. Perhaps the TV cable is loose or out of adjustment?? Or even the throttle cable.
If you have a smartphone, maybe make a small video and post it up to youtube for some visual reference.
Aside from a vacuum leak, which when the engine revs (from the extra air) that tells the transmission to downshift. Perhaps the TV cable is loose or out of adjustment?? Or even the throttle cable.
#9
Member
Does what you are experiencing look like this???
This is my Jeep heading off to work. Is it similar?
Edit: Speed unchanged but RPMs shifting?
This is my Jeep heading off to work. Is it similar?
Edit: Speed unchanged but RPMs shifting?
Last edited by ThatAintStock00; 06-03-2013 at 01:35 PM.
#11
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That is definitely a full gear change with 1k RPMs. No change in speed, right? I'm just at a lost as to what would trigger that. Did you readjust your TV cable and double check the connections on the transmission? Fluid level ok? Install a slip yoke eliminator kit when you lifted?
On my Ranger, when I rebuilt the transmission, I broke a tab on a connection, and that kept my torque converter from locking up. Perhaps something was pulled off/not seated all the way.
On my Ranger, when I rebuilt the transmission, I broke a tab on a connection, and that kept my torque converter from locking up. Perhaps something was pulled off/not seated all the way.
#12
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Year: 2001
Model: Cherokee
Engine: 2.5 turbo Diesel
No I didn't fit a SYE I am gonna fit a Transfer case drop though,would the angle of the rear prop maybe be a cause for this do you think? its only a 3" lift and all iv read here suggests a SYE isn't required, Would the prop pulling slightly out from the rear of the gearbox cause this? being the angle is now obviously more extreme than when standard,thanks for all your advice buddy really appreciate the help,and what is the TV you referred to...
Last edited by samurai; 06-05-2013 at 04:46 AM.
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