Have you figured out what the problem is?

 

No no crank sensor on TBI engines those didnt start til the magnum engines in 92

 

Mine has the same problem, so far I've changed the crank sensor, distributor's cap & rotor & coil but still no sparks. All splices are checked, now waiting for the camshaft sensor (pickup coil) from the autopart store. Not sure if it, camshaft's, will fix the problem. Mine is 93 dakota, 95000 mile.

 

I just went thru a hair pulling escapade that wound up being a bad TPS on my wife's XJ Cherokee last fall; it never failed to start but it was doing all kind of weird stuff;
About the 2nd thing that I replaced early on was the TPS; no change in symptoms or voltage rfeadings; whether by scanner or multimeter/back probing; so 2 different computers 2 JY wiring harness and 6 months later it wound up the 1st TPS that I installed was bad as well. I kept saying "can't be" because I had changed it once already, and chased my tail all around that stupid sensor and wound up replacing it for the 2nd time and no probems since.

Now I'm not saying that I think your problem in this case is the TPS; (it wont cause a no start; itll start with the TPS unhooked but it wont run right))
but what I AM saying is that just because you replaced it dont mean you got a good part to replace it with; got a scanner?

 

I'm wondering about the crankshaft sensor I replaced. The new part looks a little shorter than the original one. I am't sure will make any different? It looks and fits right in but a little shorter. Any suggestion?

 

The problem was a roasted computer.

 

adrielkelsick;2769653]The problem was a roasted computer


Any recommend for place to buy new PCM, I'll try that route?

 

[QUOTE=Sunnysky;2769458]I'm wondering about the crankshaft sensor I replaced. The new part looks a little shorter than the original one.

If the new sensor is shorter than there is a good chance it will not read properly. The sensor is a halleffect switch the reads on off on off etc. If the new one is to short it will not read at all. You should be able to test the new one to make sure it is reading with a digital meter. When you test it you will have to back probe the wires( not sure what two wires the are without looking at a schematic) with the key on and slowly rotate the engine. It should read no voltage then around 5 volts then 0 volts then 5 volts again.

 

Thanks for your suggestion, I'll check out.

 

are we sure the truck is a '91? If it is it should not even HAVE a crank sensor! Or is it an early 92 with a production date in late 91?? Just because the truck was built in calender year '91, dont mean it is a 91 model;
91 should be an "LA" series engine with TBI.