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Unread 03-15-2015, 01:09 PM   #1
hansj3
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1997 TJ Wrangler 
 
Join Date: Mar 2015
Location: Ssp, Mn
Posts: 2
help with new jeep, posible camshaft issues

I have a 97 Jeep Wrangler that I traded a friend for. when I first got it it had a blown motor.he managed to crack a cylinder and it was leaking coolant all over the place. the only engine that I found in my area was out of an 88 MJ.after swapping out brackets and oil pan and replaced the timing chain, I got her running. the engine itself has relatively low miles and had good even compression across the board. I test drove it after I had it together and it had an issue. it would bog right off of throttle and nearly stall unless I eased into the throttle. it would also not have any power well below normal my top speed was maybe 60 and it took forever to get there it has 235 70 15 tires so it shouldn't be an issue and its not even loaded down with really anything. The po said it would keep up with traffic at 75 mph.
the problem I think I'm having is low manifold vacuum. ive checked and replaced gaskets, there are no obiovous leaks. What the ECU sees is like 13 inches of vacuum. I have tried several MAP sensors two new and several junkyard pull offs and it doesn't seem to matter which one I put in. There are no codes. this leads me to the crux of my question is the Renix cam that much different from the MPFI camshaft? That'sthe only part that might matter that iI didn't swap

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Unread 03-15-2015, 01:38 PM   #2
Jeepsr4me
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Join Date: Dec 2004
Posts: 5,979
I have installed various years in just about any combo and never had a issue with what you have..


Oriely Auto parts has a neat way of showing compatible vehicles.

97 up

  • Camshafts
  • Used With Hydraulic Lifters
  • Advertised Duration (Deg): 256 Intake/260 Exhaust
  • Duration At 0.050 Inch Lift (Deg): 188 Intake/192 Exhaust
1983-1995
  • UPC: 729295131960
  • Camshafts
  • Used With Hydraulic Lifters
  • Advertised Duration (Deg): 270 Intake/270 Exhaust
  • Duration At 0.050 Inch Lift (Deg): 196 Intake/196 Exhaust
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Unread 03-15-2015, 08:28 PM   #3
hansj3
Registered User
1997 TJ Wrangler 
 
Join Date: Mar 2015
Location: Ssp, Mn
Posts: 2
I went on a test drive today to try and figure out a better way to describe the problems I'm having. under 2000 rpm if I give it more than a third throttle it's like somebody shut off the ignition. under 3200 rpm if so if I give it more than a third throttle it pops and bucks and it's as if I have no more power, but it will maintain speed.above 3200 rpm it feels as if the engine is putting out normal power the torque Peaks right around 4000 rpm and after that it feels wheasy until red line. It idles just like every 2.5 and 4.0 I've ever come across, there is a faint smell, kind of like its running rich

has anyone ever come across anything like this? this Jeep is driving me up the wall
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Unread 03-15-2015, 09:20 PM   #4
wtroger
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1998 TJ Wrangler 
 
Join Date: Jun 2008
Location: Kansas
Posts: 356
Sounds like the timing is off
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Unread 03-16-2015, 05:54 AM   #5
Jeepsr4me
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Join Date: Dec 2004
Posts: 5,979
test timing at idle and at higher rpm... Just to see what its doing.
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