no spark to spark plugs??? - JeepForum.com
 
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post #1 of 5 Old 09-07-2005, 06:46 AM Thread Starter
jeepgcnp
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no spark to spark plugs???

Hey,

Yesterday i started my 93 jeep granc cherokee and it turned over fine, 2 seconds later it died in the same way as if you had pulled the choke on a lawnmower. i checked the fuel filter, fuel pump, spark plugs, distrubutor cap, and coil and they all check out ok. i have heard that there is an ignition module in the distributor that will stop the distributor from sparking. Any suggestions as to why i am not getting spark?

thanks

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post #2 of 5 Old 09-07-2005, 08:04 AM
Turbonut
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Engine 5.2 V-8 or the 4.0 6 cyl?
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post #3 of 5 Old 09-07-2005, 10:54 AM
greasefingers
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Well it can be several things. Two of the most common things are: no spark from the coil & low or no fuel pressure. To check for spark at the plugs. You have to pull the one of the plug wires and hold it away from the engine block which is ground. You may want to use insulated pliers to hold the wire if the wires are old, to avoid being zapped. This is best observed at night. If you do not get arcing while cranking the engine then I would check the Crank & Cam shaft sensors. Also the cap and rotor might be frigged and maybe the coil is bad. You have to keep working backwards until you find juice. A Haynes manual is necessary for testing the sensors.

If you do see spark, then I assume its the fuel pump or a clogged gas filter. The pump is located inside of the gas tank. You can measure the fuel pressure at the fuel rail. It should be around 30 to 40 psig. Simply pushing the fuel rail valve, to check for pressure, may not be good enough, but if nothing squirts out then you now know.

Another scenario is that the PCM is not grounding the ADS relay, which powers the fuel pump relay.

Cheers Steve

94 Black Laredo 4-Liter with QuadraTrac (42RE trans & NP249 TC) 200,000 + miles purchased new

88 Cherokee 2-door with 5speed manual 139K miles(deceased) purchased new
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post #4 of 5 Old 09-07-2005, 11:16 AM
gregmondro
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are you getting spark to the distributor at all? If you already checked the coil and everything, i'd say CPS. I'm assuming you have a 4.0l.

here's instructions for finding and replacing it...
http://fivezerofive.com/cgi-bin/weba...iewnews&id=269

99 Jeep XJ - NP231, SYE, 4.56's, Rear D44 w/ Detroit SoftLocker and a RockCrusher Diff Cover, 35x12.5 BFG A/Ts, RE 5.5" XD Lift, Skidrow TC Skid, ORT Rear Bumper + Carrier, Rigidco Front Winch Bumper + Steering Box Plate, Milemarker 8000 Winch, Rock Sliders, HD Currie Steering, Control Arm Skids, Goferit Tie Rod Flip Insert, Optima Red Top and a few other goodies...
FiveZeroFive
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post #5 of 5 Old 11-27-2011, 09:08 PM
miles28
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Don't think that link works correctly
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