tripbarb

hey guys my 91 4.0 xj is having some issues. it had a miss so i decided to tune it up new plugs wires dist cap rotor button. i have done this a thousand times if ive done it once. anyway after changing everything i tried to crank it. well it turned over fast then slow fast then slow and would not start. my first thought ive got a wire on wrong well i retraced all my wires three times and i swear they are right but if u unhook the coil wire it turns over like it should. So that tells me ive got a plug wire wrong but i swear i cant find it help

nasonguy

do you even have spark? Have a buddy turn it over while you hold one of the plug wires close to a ground, it should visibly ark...

RENIXBEAST

I don't recommend holding the plug wire.. ZZZZZZZZAAAAAAAPPPP!!!. Ouch. Just rest it near a ground, then have a buddy turn it over for you.

nasonguy

lol, as long as your holding it up on the insulation (at least a few inches up) and your not touching anything on the vehicle, you'll be OK. Heck, I've done it a million times.

Or if you're a wimp and you don't understand how electricity works, you could rest it within an inch of a ground (pretty much the entire motor), and have a buddy crank it, lol.

I should say, (as CYA), that it's safe and reccomended not to do either...

tripbarb

it was firing before i changed wires and stuff and it acts like it wants to start at times. hell i even changed the starter just to be sure like i say i have worked on cars all my life from complete engine overhauls to small stuff like tune ups and i guess this is wy i am so frustrated cause this is so simple

nasonguy

have you checked spark though?

tripbarb

not yet but it should spark whether i have a wire crossed or not, right ?

nasonguy

yeah, it will, but maybe the CPS died or something, I know, it's a long shot, but it's worth cheacking...

tripbarb

ok im abbreviation ignorant what is cps

tripbarb

as soon as i typed that question the answer hit me crank position sensor. ok if it is bad would it cause it to turn over fast then slow fast then slow if it efects timing i guess it would hey thanks for all your help but is there a way i can be sure the cps is bad if all else fails

96Cherokee113

I have a similar problem. I have no spark and checking the CPS was recommended. Forum member "Abovetimberline" recommended checking resistance between terminals B and C on the connector. Resistance should be close to zero. It's a three pin connector, on the driver's side, near the throttle body. http://media.photobucket.com/image/j...or_diagram.jpg Here's a picture. Hopefully this will help you out, then maybe I can solve my own problem. Good luck!

troy fritz

Did you turn the rotor when removing or replaceing it? If so then you might have knocked it out of time.

tripbarb

Imjust gonna tear it back down and check timing wires and if all else fails i will probably replace the cps. Hey thanks for all the input guys