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Old 02-20-2012, 07:18 PM   #1
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91 jeep yj no start

Ok I have spark at the plugs. Fuel at the rail but no start
I just replaced the plugs and wires just in case but nothing
Will not even fire with starting fluid

HELP......

I went got new tires on it Saturday . Sunday installed new bumper monday get in it to go to work and nothing

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Old 02-20-2012, 07:24 PM   #2
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check your cam position sensor or crank position sensor. sensors like these on wranglers tend to always fail.

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Old 02-20-2012, 07:38 PM   #3
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x2 on the crank sensor...
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Old 02-20-2012, 07:52 PM   #4
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Ok so that would stop from starting even with starting fluid ?
Of course it would have to be a special order part.
Also if I may ask. Where is the part located? Driver side? Pass side? Of the flywheel
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Old 02-20-2012, 08:31 PM   #5
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which motor you got?....2.5 or 4.0?....makes a difference in location
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Old 02-20-2012, 08:31 PM   #6
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4.0
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Old 02-20-2012, 08:36 PM   #7
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ok...it's mounted on the bell housing on the drivers side toward the front....there's a way to test it before replacing if you are familiar with an ohm meter and have one at your disposal.....let me know, and i'll give you the step by step test procedure...
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Old 02-20-2012, 09:59 PM   #8
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you getting constant spark on all plugs? i had a similar system but would only get random sparking. ended up cam position sensor, inside distributor
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Old 02-21-2012, 07:14 AM   #9
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Yes constant spark and fuel. But no run. The other strange thing that happened about a week before the shift light that nev worked started to work for about a half a day and stopped working again ... Guessing that the injectors are not firing but I would think I would get something from the starting fluid
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Old 02-21-2012, 08:18 AM   #10
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Does it turn over just won't fire and run or does it not even turn over
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Old 02-21-2012, 08:59 AM   #11
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It turns over just fine but will not run........ If you crank it for a min or so you get that feeling that it wants to run but nothing we have all heard that sound just that little more and she go but nothing

The thing I'm stuck on is that old thing you have fuel YES you have spark YES then should run

I ordered the crank sensor it has 150,000 miles on the motor the cam sensor looks ok but never know
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Old 02-21-2012, 01:16 PM   #12
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have you checked actual fuel pressure? or just that there is fuel in the rail? could have low pressure, or could be clogged injectors?

but i had almost the same problem. i replaced the distributor and the cam sensor inside it ( you can replace separate as well) and mine fired right up. BUT i only had intermittent spark.


when did this problem start?

also, open the fuse box and swap the ASO, fuel pump, and starter relays around and see if anything changes
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Old 02-21-2012, 01:53 PM   #13
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The problem started Monday morning drove around all weekend no problems (normal driving ). There seems to be good pressure on the rail but don't have a gauge going to try the sensor and see what happens . She does sound like she wants to start sounds like it really needs. A tune up but did that new cap rotor wires plugs


Did swap the relays around last night
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Old 02-21-2012, 03:47 PM   #14
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The crank position sensor is a good bet. If its defective the timing will be way off...
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Old 02-21-2012, 04:12 PM   #15
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Quote:
Originally Posted by Rick1805 View Post
....Fuel at the rail....
Just because you have fuel at the rail doesnt mean your injectors are getting a signal.

Got a noid light? check it.

Cam sensor if no signal.
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Old 02-21-2012, 04:29 PM   #16
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Where is this sensor on a 92 - 4 banger???
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Old 02-21-2012, 08:39 PM   #17
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If it was a fuel problem you can just spray some starting fluid down the throttle body and it should run for a few seconds or so just to make sure its not a fuel issue.
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Old 02-22-2012, 11:52 AM   #18
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ok update....

replaced crank sensor no help still no start....
I have spark and fuel at the plugs my next thow money at it thing is replace the
cam sensor its on order I tried to ohm it and got nothing out of it but as the dodge place and the other parts places if i have spark then that should be working

So I am at a loss if anyone has any ideas please put them forward my next item is the computer ..............
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Old 02-22-2012, 02:09 PM   #19
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Fuel at the plugs?

Is it flooding?

You try checking the injector @ harness with a noid light?

Cam sensor is in the distributor.....
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Old 02-22-2012, 03:51 PM   #20
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Fuel at the plugs?

Is it flooding?

You try checking the injector @ harness with a noid light?

Cam sensor is in the distributor.....
yes fuel at the plugs when i turn the motor over with the plugs out i get a mist of fuel out of the plug holes

dont have a noid light and yes the cam sensor in the distributor and seems no one has it in stock you would think one of jeeps used in everything motor no one has parts in stock for it not even jeep dealer
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Old 02-22-2012, 04:18 PM   #21
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thats why i replaced the whole distributor. no one had the sensor in stock, but advance did have a distributor with the sensor installed in stock, i needed it asap, could not wait so had to pay extra, but o-well
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Old 02-24-2012, 07:03 PM   #22
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I have this same problem right now spark and fuel but no start its annoying as hell, what do i do. I was thinkin crank senser mine is a 92 does mine have a cam senser too. 4.0 ltr
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Old 02-24-2012, 08:18 PM   #23
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Yes it's a pain Need to set the timing on mine and hopefully it will start
Yours might be the same problem as mine after replacing the cam sensor it seemed to want to start but is off time
Going to try again tomorrow

Crank sensor for me did nothing try cam sensor first pain in the butt to replace as you have to take the distributor apart
Hopefully tomorrow will have better news because my next throw money at it is replace the computer or better yet scrap it and put new motor in it
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Old 02-24-2012, 09:43 PM   #24
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Let me know how it goes I kno u can get computers from junk yards or ebay for not too bad a price. And why do you have to set timing did it really jump off time you think.
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Old 02-25-2012, 03:22 PM   #25
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Ok IT'S RUNNING.

The timing was off. The cam sensor was bad had to pull the distributor out to replace it and when I put it back in must of been off a tooth or more that started in the pull it out damn I'm 180 off and try again well I was only really 90 off so once I got everything reset top dead #1 both valves closed timing mark correct and she fired....

My advice take a lot of photos so you can be sure where everything was and how it sat
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Old 02-25-2012, 08:36 PM   #26
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awesome man thanks alot so did you have to take the dist right out then to change the cam sensor. ive taken one dist out before and ya its not a fun job glad she got running for you that great. I ordered my cam sensor today im gettin it tomoro and well see ill keep you informed again thanks alot.
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Old 02-25-2012, 09:06 PM   #27
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glad you got it fixed. it was a PITA when i had this same problem.
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Old 02-26-2012, 06:29 PM   #28
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well mine wasnt cam sensor but i found out how to pull codes and pulled a number 11 which is crank sesnor i belive yay me.
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Old 02-27-2012, 06:38 PM   #29
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my yj still wont start guys after i replaced cps please help, anyone...
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Old 02-27-2012, 08:08 PM   #30
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Did you check your timing? Sounds like it fixed Ricks problem...

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