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spark problem


 
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TAG666
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Joined: 18 Feb 2006
Location: leeds uk

PostPosted: Sat Feb 18, 2006 12:39 pm    Post subject: spark problem Reply with quote

HI,

I've been looking to buy a xj jeep for a while now, and have come across a 96 2.5 sport petrol , now after talking to the guy on the phone he says it's in excellent condition and ran perfect, but it has developed a spark problem. sometimes it starts sometimes no joy! if its towed it starts and once its running there's no problems until you turn off and try to start again it may start or not! he says he's had the ecu replaced but it's not cured the fault, also it's not a fuel problem he insists its a ignition fault. i have to arrange go over and have a look at this vehicle as he's willing to take a loss on the price due to the fault. any ideas? Confused
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JeepinNH
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Joined: 13 Sep 2005
Location: New Hampshire

PostPosted: Sat Feb 18, 2006 3:47 pm    Post subject: spark Reply with quote

As I just posted in another thread: Sounds like your crank position sensor or the other position sensor in the distributor may have died. Get a repair manual that describes how to test the sensors. These sensors are used by the computer to tell if the motor is turning so no sensor no spark. This is a typical failure as Jeep's get older but pretty easy to diagnose. Good luck.
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Mike

Present: 99 Cherokee
Past: 86, 87 Cherokee; 94 Grand Cherokee
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LicKwiD
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Joined: 23 Jan 2006
Location: Bethlehem

PostPosted: Sat Feb 18, 2006 3:51 pm    Post subject: Re: spark problem Reply with quote

TAG666 wrote:
HI,

I've been looking to buy a xj jeep for a while now, and have come across a 96 2.5 sport petrol , now after talking to the guy on the phone he says it's in excellent condition and ran perfect, but it has developed a spark problem. sometimes it starts sometimes no joy! if its towed it starts and once its running there's no problems until you turn off and try to start again it may start or not! he says he's had the ecu replaced but it's not cured the fault, also it's not a fuel problem he insists its a ignition fault. i have to arrange go over and have a look at this vehicle as he's willing to take a loss on the price due to the fault. any ideas? Confused


Tune up, spark plugs (check the condition if you can) , spark plug wires, dizzy cap & rotor, starter (does it click or click and do nothing) batt may need to be changed. every 5 years they say change your batt regardless, so if its still the oem batt from factory i'd say its time for a new one. ignition coil sometimes starter problem. Ohm readings from the alt, bat, see if the alt is charging right.

One way to check for spark you pull a plug wire up and stick a screwdriver into the spark plug end, then lay it near, but not touching, about half an inch away, a convenient ground point and have someone crank the engine. look for an arc to ground. if you don't see one then take the dist cap off and make sure the the rotor button is turning when the engine is being cranked if no spark is being had it could be your electrical system. if the rotor does not spin could be a bad distrib. Could be the coil or ICM in the distributor. if it is a fuel problem, possibly a new fuel filter could be in order? your fuel pump could have dirt, corrosion, rust build up from inside the tank and may need replacing. Fuel inj. could be clogged, run some fuel inj. cleaner in your gas.

Another way of testing if you have spark is taking a multimeter to the coil itself and testing the coil to the - & +. Im not sure what the resistance should be at for the jeep coil, should be around .06-.1 ohms. this info can be found in a manual.
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