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post #1 of 7 Old 06-10-2013, 09:41 AM Thread Starter
harv51
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1998 ZJ 
 
Join Date: Jun 2013
Location: eufaula
Posts: 9
hesitation

new to the forum and already have question. 98 cherokee has bad hesitation when starting off. im thinking fuel pump any suggestions?

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post #2 of 7 Old 06-10-2013, 02:07 PM
JasonStebbins
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1997 ZJ 
 
Join Date: Jan 2009
Posts: 3,138
Kind of vague. Is it sputtering/slipping/stalling/backfiring/misfiring? Is the idle smooth?

When is the last time you did an ignition tune-up?

Check fuel pressure at the rail?

Battery terminals clean and tight? All grounds clean and tight?

Ever clean off the IAC?

Poop
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post #3 of 7 Old 06-10-2013, 04:54 PM Thread Starter
harv51
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1998 ZJ 
 
Join Date: Jun 2013
Location: eufaula
Posts: 9
sorry about being so vague. i just bbought it. havent had time to do much to it . it acts like it is starving for fuel.thnx for the reply.
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post #4 of 7 Old 06-10-2013, 05:35 PM
dellis
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1998 ZJ 
 
Join Date: Feb 2013
Location: Vienna
Posts: 313
If it is the fuel pump, I would surmise that you would experience problems at times other than just starting out. But, to be sure, can you put a fuel gauge on the rail and give us the readings/behavior when you start up both at idle and as the engine gets revved?
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post #5 of 7 Old 06-10-2013, 09:23 PM
Oldfrog
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2007 WK 
 
Join Date: Feb 2008
Location: Louisiana/Texas
Posts: 5,092
Yeah, I'd check fuel pressure at the rail, but I bet the old engine is just dirty and/or carboned up.

Pour 1/2 can of Seafoam in your fuel tank for starters. If that doesnt work after about 100 miles, then change the spark plugs, wires, rotor cap, distr. cap and then clean your throttle body. Do NOT let the coil wire cross any of the the plug wires as it exits the distr. cap when you swap wires. Go ahead and swap the air filter element and check for vacuum leaks too.

2007 5.7 Hemi, Ltd. QD II -
1997 ZJ, 4,0 select trac, Up country, track lok.
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post #6 of 7 Old 06-18-2013, 02:42 PM
pitch123
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1998 ZJ 
 
Join Date: Aug 2012
Location: Seattle
Posts: 2
my ZJ started slow. it needed more cruck than usual. two weeks ago, it can not start after I finished shopping. It turned out a bad starter. It starts quickly with the new starter.
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post #7 of 7 Old 06-18-2013, 03:17 PM Thread Starter
harv51
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1998 ZJ 
 
Join Date: Jun 2013
Location: eufaula
Posts: 9
well pulled the tank off replaced fuel pump runs like a top. thnx for suggestions
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