Speedometer Not Working, And An Engine Stumble

[Mattwheels]

Hey all!

 

So the comanche is coming right along! so now its basically a 92 comanche, I pulled my Idiot lights cluster (92 electronic speed)  with a gauge cluster ( 96 )

 

So far my fuel gauge, tachometer, and voltmeter all work perfectly, 

 

Oil pressure, and temperature aren't working but I have the new sending units on the way, and the only thing I can't get working is the speedometer. The cherokee I pulled the engine and harness from was 2wd so I'm not quite sure where the speedometer was getting its reading from. The transfer case I mated to the new ax15 has a mechanical speedo, do I need to convert that to a electronic?

 

As for the engine stumble, It does it at about 2k rpm and only under load, in neutral it seems to rev just fine to 4-5k, but in any gear once you hit 2k it feels like the engine is going to die, and going WOT has no effect at all, except drop the rpms to 6-700.

 

So far I've changed, Spark plugs, Plug Wires, Cap, Rotor, IAC sensor, and tomorrow I'll be ordering a new o2 sensor.

 

Can a bad ground to the block cause it to stumble? or a bad o2? I unplugged the o2 and drove it around and it still stumbled.

[Mattwheels]

o2 sensor and ground have been fixed but to no avail, still stumbles around 2k rpm, and back fires a little through the throttle, going to clean the TB, and get a new MAP sensor see if that changes anything.

[Geonovast]

You'll need to get an electronic sender for the T-case, and plug it into the speedometer plug on the harness.  No cable whatsoever for 91+.  Earlier electronic senders (I think 91-93ish) were a sender that screwed onto a cable style sender in the T-case.  If you get a newer one, you'll have to replace the whole thing (and possibly gear).

 

As for your stumbling, check your fuel pressure before you replace anything else.

[Mattwheels]

Fuel pressure was spot on, checked it when my engine wasn't starting, I've got a new MAP sensor that should be arriving today, hoping that will fix it. if not I'll also be replacing the TPS, But the good news is every pretty much all the sensors on this jeep will be brand new! lol