Topic: Stupid Jeep, part 23

[Mozman68]

I have the doors off....I could only hear it with the radio off and if I was at a stop light.   

[Mozman68]

Spent part of the morning wiring in the Dakota calibration unit to the speed sensor.


My jumping speedo is back and I think it may be the death of me. I guess I'll be tracing the speedo wire to make sure nothing is exposed causing the jumpiness. Or I may just sell the Jeep and buy a new one...may be easier....

[Jeffy]

I have the doors off....I could only hear it with the radio off and if I was at a stop light.   

I can hear mine though the firewall.  Although mine is a bit larger then yours. 18" vs 16".

[Mozman68]

I can definitely feel a difference in acceleration. I as actually surprised at the difference.

[Jeffy]

I can definitely feel a difference in acceleration. I as actually surprised at the difference.

That's because the fan's weight and the winds resistance slows the spool of the engine.  It should spin up faster now.  You might not notice the extra power at high RPM's but it should be there as well.

[Mozman68]

Well...I've been gone the past three days, but driving my son to baseball, the speedo dropped down completely and stopped working. Then, as soon as I push in the clutch to downshif coming to a stop light, rpm's go all the way down and Jeep dies.

CEL went out again.

Could it be as simple as a bad ground on the speedo wire which in turn is screwing up the engine management system when it cuts out completely??

[sharpxmen]

Well...I've been gone the past three days, but driving my son to baseball, the speedo dropped down completely and stopped working. Then, as soon as I push in the clutch to downshif coming to a stop light, rpm's go all the way down and Jeep dies.

CEL went out again.

Could it be as simple as a bad ground on the speedo wire which in turn is screwing up the engine management system when it cuts out completely??

i don't think so, sounds more like a PCM power or ground or cranks/cam sensor issue. Is the jeep keep running if you keep the revs up? if that's the case then it can be something else as well, i am not sure if you meant that it dies even if you keep it in gear or not.

[Mozman68]

Well...there are worst things I could do than change out the Crankshaft position sensor...the Jeep does have about 120k on it, so it will probably go bad anyway if it isn't the cause.

We'll try that first and then move on to something else if that doesn't fix it.

[Mozman68]

Hmmm...didn't see my temperature going down on my way back from lunch....my 30 amp fuse blew at some point.

I used the 30 amp as that is what Jeffy had in his write-up.  Is there any reason I should use a larger one, or I wonder if this could be related to my power problems?

[sharpxmen]

Hmmm...didn't see my temperature going down on my way back from lunch....my 30 amp fuse blew at some point.

I used the 30 amp as that is what Jeffy had in his write-up.  Is there any reason I should use a larger one, or I wonder if this could be related to my power problems?

as long as your wires and relay can handle it you can go 40 or 50 amps

[Mozman68]

 





Stupid Chrysler mechanic didn't route the O2 wire properly which was forcing the crankshaft position sensor over too close to the manifold.....so...over the past couple of years, it's been hitting the pipe.

A quick drive showed improvement in the engine, but the speedo was still jumping.  Disconnected the battery for a while and will try again after everything has had time to re-set itself.

Even if the speedo still jumps, I feel at least this was a good exercise.  

[FourbangerYJ]

  That should do the trick! Not sure on the speedo fix.

[Mozman68]

Well...I guess I need to give the computer a few drives to set itself up.

As far as the speedo is concerned, now I don't mind pulling those wires now to see if something similar has happened there.

[Mozman68]

Check engine light has stayed off after multiple starts and stops....I don't think it's done that for more than 3 years.

If I feel like it, may trace the speedo wires tomorrow to see what's up with that...
 

[sharpxmen]

don't think the computer reset would help in any way with the speedo. I would pull the cover off those wires and remove/replace the burned portions (solder and heat shrink tube on top). I wouldn't be surprised if the speedo suffers from a similar problem.