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1993 Jeep Cherokee Cranky Jeep

Tiny
BUBBADUCK 2
  • MEMBER
  • 1993 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 70,000 MILES
When the ignition is turned to the "on" position, there is a quick buzz that comes from the back, almost as if something is staging itself. When it is put to cank-position, it cranks, and cranks, and cranks for a very long time, until I hear another quick hum, almost as if something suddenly woke up, and this is when the engine starts. Any suggestions? Thanks. Bob
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Thursday, January 21st, 2010 AT 7:01 PM

6 Replies

Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
Put yourself a funnel in the gas tank and put your ear on it and have someone turn the key. Is the hum coming from the tank or no?
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Thursday, January 21st, 2010 AT 8:26 PM
Tiny
BUBBADUCK 2
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  • 4 POSTS
As of today it's been established that the second hum that I hear is in fact the fuel pump doing what it's supposed to do. The question now stands as why does it take so long for it to kick in? Thanks!
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Friday, January 22nd, 2010 AT 6:31 PM
Tiny
BLACKOP555
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Lets find that out now!

When turning the key first it instantly turns on right?

Next step is watch the tachometer. Is it at 0 untill the buzz then it jumps up and reads the RPM or is it showing a rpm reading but still no buzz?

Hows the oil pressure look when cranking
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Monday, January 25th, 2010 AT 2:40 PM
Tiny
BUBBADUCK 2
  • MEMBER
  • 4 POSTS
Well, when the key is put to the on position, there is a short buzz, that appears to coming from over my right shoulder, but it doesn't stay on. Then, as the motor is being cranked, it just cranks away for quite awhile, until I hear something from what appears to be over my left shoulder come on, and stay on, and that's when the Jeep fires up. Unfortunately I have no tach, just an oversized fuel gauge, and the oil pressure looks ok. If that helps.
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Monday, January 25th, 2010 AT 6:17 PM
Tiny
BLACKOP555
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Take out the fuel pump relay and jump it across the terminalls and try to crank it. Will it crank and fire up now or no?

When jumping it you should hear the pump come on and stay on
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Tuesday, January 26th, 2010 AT 9:59 PM
Tiny
BUBBADUCK 2
  • MEMBER
  • 4 POSTS
UPDATE: After a week or so of no-starts, called a friend who found out that the fuel pump was actually losing it's prime. This was a part that was replaced back in October, so I didn't even think of it as being the culprit. Needed a coil wire too. Jeep's running quite well now. Film at 11, I guess. Thanks for the tips and tricks!
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Friday, February 5th, 2010 AT 8:08 PM

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