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98 Grand Cherokee won't start


 
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emac
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Joined: 31 Aug 2007

PostPosted: Fri Aug 31, 2007 5:39 am    Post subject: 98 Grand Cherokee won't start Reply with quote

New here and have a question for anyone that can help....have a 98 GC which cranks just fine but won't start. I have replaced the plugs, cap, wires, rotor, battery and ingnition coil but still can't get it to fire up. It just turns over but won't start. Any suggestions? Thanks!
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Orangeamc13
Got Rev Limiter?
Got Rev Limiter?


Joined: 20 Feb 2006
Location: East Springfield, Massachusetts - U.S.A.

PostPosted: Fri Aug 31, 2007 9:34 am    Post subject: Reply with quote

Do you have a 6 or 8 cylinder? Are you getting fuel? Is there any spark?
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swamp boy
Cherokee Muderator
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Joined: 01 Jan 2004
Location: New Orleans LA.

PostPosted: Fri Aug 31, 2007 1:39 pm    Post subject: Reply with quote

can you hear the fuel pump??
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prj57
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Joined: 28 Sep 2007

PostPosted: Tue Oct 02, 2007 9:07 am    Post subject: Reply with quote

Check for FUEL:

Option ONE: Bad FPR
Option TWO: Bad Injector/s

What you can do is, take one of the fuel rails out along with the injectors and point it away/outside of the engine bay. Get a second person to crank the engine: CAUTION!!! High pressure raw fuel SHOULD spray about 2 feet!!!

Check both rails if a V8, try to see if spray power/distance is the same along all injectors!

This is the fastest and easiest way to check injector/fuel rail/ pump problems.... if the fuel pump is gone there should be little or no spray at all!

Again: Exercise caution when doing this and have a mate and a fire extinguisher with you!
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RussellRowell
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Joined: 09 Feb 2006
Location: Jacksonville Florida

PostPosted: Wed Oct 31, 2007 9:09 pm    Post subject: Reply with quote

I wouldn't listen to pj up there. Sounds like he works under a tree and has never looked in a manual before. Ye, lets do it the hard way and most dangerous way first. C'mon man. Use your brains will ya. I can almost guarentee it's not the FPR or injectors. And the easiest way to check this problem is to listen for the fuel pump to turn on when turning on ignition. If fuel pump works. Remove the fuel rail relief valve cap and press the valve stem in to see if fuel squirts out. If it doesn't. It's probably a clogged fuel filter. Change the fuel filter. If still no start. Change the two seals in the FPR. If still no start. Check all your vaccum lines. I'd do all that before pulling a fuel rail or injector. Just had to give my 2 cents on that last reply. Thank you
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Orangeamc13
Got Rev Limiter?
Got Rev Limiter?


Joined: 20 Feb 2006
Location: East Springfield, Massachusetts - U.S.A.

PostPosted: Thu Nov 01, 2007 7:02 am    Post subject: Reply with quote

I've had a bad fuel pump twice before I switched to an inline pump. Both times my bad pump was audible and the relief valve was squirting! Wink
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fastfreddie
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Joined: 19 Dec 2007

PostPosted: Wed Dec 26, 2007 8:20 pm    Post subject: Reply with quote

Try checking the Crankshaft Position Sensor on the flywheel/flexplate.
Mine wouldn't start. Changed the fuel pump, cap, wires, plugs, fuel filter, camshaft position sensor, all to no avail. Then someone told me about the Crankshaft Position Sensor (C.P.S. for short). Paid 12 dollars for it at NAPA changed it out in about 20 minutes. Started my 98 zj right up. No problems since!

98 ZJ
Budget Boost
31x10.5 BF Goodrich Mud TA's
4.0 with header, snorkle.
242 T-Case
and a heavy foot!
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fastfreddie
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Joined: 19 Dec 2007

PostPosted: Wed Dec 26, 2007 8:23 pm    Post subject: Reply with quote

Also check the little fuses on the block out under the hood. I'm not sure exactly which one it is but on mine a few years back I blew 1 of those and it took me a week to find out why mine wouldn't start.

Always start simple! Fuses 1st!
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swamp boy
Cherokee Muderator
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Joined: 01 Jan 2004
Location: New Orleans LA.

PostPosted: Sat Dec 29, 2007 5:31 pm    Post subject: Reply with quote

Crank position sensor is a very good idea.. This would cause it to not start at all.


In fact I dont even think you will get spark if the CPS is bad..
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