ZJ no start has spark and fuel pressure - Page 2 - JeepForum.com
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post #16 of 24 Old 02-24-2011, 01:54 PM
Fisheadstew
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1997 ZJ 
 
Join Date: Oct 2009
Location: Plainfield, Il
Posts: 6
Mine ended up being the coil. I changed the cap and rotor first, pulled the fuel pump relay... same thing, cranked with no start.
Then changed out the coil, cranked and it sputtered and belched a few times. So I pulled the plugs which were of course soaked,
and ran for a new set.
Replaced the plugs and it started right off, put the fuel pump relay back in and the rest as they say is history
Started right up this morning ready for another 229k !




Thanks, Fish

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post #17 of 24 Old 02-24-2011, 02:05 PM Thread Starter
greentank
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1998 TJ Wrangler 
 
Join Date: Nov 2008
Location: Reno NV
Posts: 37
Fish, glad to hear there is another jeep still on the road

as for mine the noise does not go away after it has warmed up. I just had it running for about an hour while i tried to figure out where the noise was with a stethoscope. so far no luck it does sound like it is louder from the bottom side of the engine. (of course everything is loud under the engine when its running) it doesn't seem to miss at an idle, but if you rev the engine, or try to drive it the engine is all over the place.

one other thing, after running it a few times i no longer need to hold the throttle open to get it to fire.
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post #18 of 24 Old 02-24-2011, 02:25 PM
SGTCornewell
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2002 KJ Liberty 
 
Join Date: Dec 2010
Location: INDIANAPOLIS
Posts: 277
if your having trouble tracking a noise, put a vacuum gauge on the engine. if its a valvetrain problem the needle will tick for you. if not, it will be steady. a good engine should read between 16-20 in of smooth vacuum on idle. i love my vacuum gauge
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post #19 of 24 Old 02-24-2011, 03:54 PM
Fisheadstew
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1997 ZJ 
 
Join Date: Oct 2009
Location: Plainfield, Il
Posts: 6
Be sure and check your oil for gas, mine was loaded... to the point I could light it!
Hope it's just a lifter *****ing about the thinned out oil.





Fish
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post #20 of 24 Old 02-25-2011, 08:07 AM
SGTCornewell
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2002 KJ Liberty 
 
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this is more known with ford explorers but if your fuel pressure regulator blows out your fuel pump can pump your crank case full of gas through your vacuum lines.
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post #21 of 24 Old 02-25-2011, 01:21 PM Thread Starter
greentank
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1998 TJ Wrangler 
 
Join Date: Nov 2008
Location: Reno NV
Posts: 37
for an update, i decided to 100% retrace my steps back to the crank sensor. I found that the flywheel had been hitting the flywheel. I'de say that the probability of that being the cause of the noise and maybe the misfire are pretty good. going to cross my fingers, go out in the snowstorm and venture to the dealership to get a factory replacement crank sensor.
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post #22 of 24 Old 02-25-2011, 06:01 PM Thread Starter
greentank
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1998 TJ Wrangler 
 
Join Date: Nov 2008
Location: Reno NV
Posts: 37
OK so as a final conclusion. The original problem apparently was the Crank Position Sensor. I used an after-market CPS that was not a good fit. The noise, and misfire that I was experiencing was due to it rubbing the flywheel. I found that the dealer didn't have one in stock so i exchanged the bad one for another the same brand, and all is well. So If anyone ever ends up with a miss/ noise after using a after-market CPS check that first you may save yourself a lot of time.
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post #23 of 24 Old 02-25-2011, 07:24 PM
Fisheadstew
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1997 ZJ 
 
Join Date: Oct 2009
Location: Plainfield, Il
Posts: 6
Great news, glad it wasn't more serious.
What was the brand of the defective unit?




Fish
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post #24 of 24 Old 02-25-2011, 07:30 PM Thread Starter
greentank
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1998 TJ Wrangler 
 
Join Date: Nov 2008
Location: Reno NV
Posts: 37
it was a Borg Warner, which Is actually a very reliable brand in my past experience. I guess everyone puts out a bad one here and there. Like I said I couldn't get on from the dealer so i tried another BW and it worked.

thanks everyone for the help.
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cps , ignition , no start

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