99 4.0 xj starting issues - JeepForum.com

 
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post #1 of 5 Old 07-10-2013, 10:07 AM Thread Starter
heekin56
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1999 XJ Cherokee 
 
Join Date: May 2012
Location: deerfield beach
Posts: 19
99 4.0 xj starting issues

This has been going on for a couple of weeks now. My jeep will crank over but it wont start until I've cranked it for the 5th to 10th time and then it starts just fine. Some days it starts right up and others it will just crank over and sometimes when I crank it over it will start and stall a couple of times and then I just give it some gas to get it going.

ALL of my relays were replaced within the last year and they don't look burnt, and I have not replaced any fuses. I was getting the check engine light about two months ago for a throttle position sensor but that magically disappeared.

Could this be caused by a bad CPS? or less likely a bad fuel pump?

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post #2 of 5 Old 07-10-2013, 01:56 PM Thread Starter
heekin56
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1999 XJ Cherokee 
 
Join Date: May 2012
Location: deerfield beach
Posts: 19
Can anyone help?
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post #3 of 5 Old 07-10-2013, 02:17 PM
JWELK
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1999 XJ Cherokee 
 
Join Date: Apr 2011
Location: Ceiba
Posts: 910
See my post, I'm having similar issues. Did you check fuel and spark?
Fuel should gush from the Shrader valve.
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post #4 of 5 Old 07-10-2013, 02:31 PM
newfieZJ
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1995 ZJ 
 
Join Date: May 2008
Posts: 6,557
Start with the basics and most inexpensive . BUy a can of combustion chamber cleaner , and a throttle body gasket . Remove and clean TB , also , remove the IAC (Idle air controller) from the TB . Don't play with it , just an old toothbrush and scrub it with the cleaner . Disconnect the battery for 1/2 hour during the process . The PCM will need to re-learn a few things but will act normal in short time . Better instructions with pics http://www.jeepforum.com/forum/f13/h...-valve-756934/

When your pcm says you have and issue , you do . OP , test the TPS . If replacing , use mopar parts

Other slow start causes are fuel pumps , poor ignition parts (coil , plugs , cap and rotor), poor compression
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post #5 of 5 Old 07-10-2013, 08:24 PM
freebird_78
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1997 XJ Cherokee 
 
Join Date: Jul 2013
Location: LAS CRUCES
Posts: 25
Having a similar issue, just not as bad. I have new or nearly new ignition parts, clean TB, etc. Friend of mine with several XJs says it's the fuel pressure regulator on top of the fuel hat.

http://www.quadratec.com/products/51304_0003.htm
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