1996 Jeep Cherokee 4.0 hesitation

Tiny
CHAPPYJASON
  • MEMBER
  • 1996 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 219,615 MILES
I just bought a 4.0 jeep cherokee classic, and it sputters sometimes during acculturation, but stops once you reach a constant speed.

I have change:
Fuel Pump/strainer
TPS
Crankshaft position sensor
Plugs
Wires
Cap
Rotar
wheel bearings
left front half shaft

I just shot the alternator and got 11.9 volts out of that, I have a new on on order but i'm not to convinced that has a lot to do with it. Because it sputtering before the alternator went crazy. I also have a check engine light, it is for the downstream O2 sensor, but my understanding is that it only asses the cat performance.
The last owner put a lift on it and I think it was just put in to general knowledge standards, as I had to fix a few things up. I'm thinking they may have did a way with a few vacuum lines.

With the fuel pressure regulator being in the tank, and it relying on the tank for a vacuum, can a aftermarket cap throw that off?

Question,
What do you think it could be?
Is there an easier way to chase down vacuum lines than just looking at each once and following the vacuum line diagram?
How can I trouble shoot the fuel pressure regulator.
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Monday, January 3rd, 2011 AT 2:03 AM

3 Replies

Tiny
M_H_RITZEL
  • EXPERT
With 219000 miles try using some throttle body cleaner, sometimes a little carbon can build up and cut down on air volume. If you try the throttle body cleaner follow instruction on the can.
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Monday, January 3rd, 2011 AT 4:09 PM
Tiny
CHAPPYJASON
  • MEMBER
I took the throttle body off and cleaned any carbon residue off with throttle body cleaner. I still get the same hesitation. I'm really convinced it is a fuel issue. I had a hard time starting it initially the last two days, but with the assistance of some starting fluid it started right up.

It also has a new fuel filter.

I am A&P(jet mechanic), so I really know nothing about vacuum systems. What can that have to do with it and were would I start, if it was a problem?
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Monday, January 3rd, 2011 AT 9:58 PM
Tiny
M_H_RITZEL
  • EXPERT
There should be a canister on the opposite side of the fuel tank filler neck attached to the frame. It has 3 lines 2 for vapor and one for liquid return. With the lift kit on it may have pulled one of the hoses off or loose. It is the liquid check valve. Check the lines. They have out a spray that one sprays on lines especially vacuum to find any leaks. Since the jeep ran all right before one may have been streached out and come off because of the ift kit. Visually inspect all the lines.
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Friday, January 14th, 2011 AT 2:37 PM

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