20 Most Recent 1990 Jeep Comanche Questions & Answers

Hey Kenneth, I agree about oil having nothing to do with poor running , start at distubuter , wires, coil packs or single coil pack , and plugs, im not saying to change everything but before you move on to other things make sure all other things are in prefict working order.

It is hard to say for certain without knowing the year, make, and model of the vehicle, but I would look for wiring problems in the steering column and blinker switch, especially if the headlights and blinkers are both controlled from that location.

There is a seperate flasher for turn signals It should either be under the dash on either side of the steering column or it may be a "combination module" which is both in one unit, usually on the right side of the column.

may be a bad fuel pump delivering fuel pressure but not enough volume ... Getting a lean missfire because of lack of fuel?

very weak battery and/or charging system

theres a lot of bolts on it

bad alternator or battery.

make sure it is not airlocked ,whathappens air trapped in water system ,even though it seems full it is not might have to blled it of air

What the problem sounds like is that one of these rods operates the actual ignition switch (I've seen this kind of ignition system on 1970's GM's). When the ignition key is turned the mechanism inside pushes one of these rods which in turn is physically connected to the ignition switch further down the steering column, have a look down there with a light you may be able to see it but it might be covered. Sounds like the rascals were trying to get to the one rod to push or pull on it in order to start the truck. I would put the key in the ignition lock turn it back and forth to see if one of the severed ends moves and notice which way it moves (one of the two going up towards the steering wheel) then put the key in run position (to unlock the steering wheel) Then push (or pull, depending) on the corresponding severed rod, this should start the vehicle. Remember there should be one click then you should feel a kind of spring action push or pull enough to engage the starter then when the truck starts let go of it. You may have to expose enough of the rod to be able to do this. To stop the engine push the rod the opposite way until you feel one click. You can also visit or call a bone yard to see if they have one of these trucks and get yourself the broken pieces or the whole steering column. I hope this helps you.

Check that the carburetor if so equipped, has its idle screw adjusted right for minimal emissions.

If it has fuel injection, then the injector(s) may be leaking.

Check for proper fuel pressure with a pressure gauge, as well.

You can start by replacing the ball joints in the front end. This will get rid of most of the play in the steering.

Change the signal light flasher. I'm not sure exactly where it is but it is more than likely under the dash near the steering coluum or close to or in the fuse box. Good luck!

You may be experiencing a pressure feed from a failing head gasket or a faulty thermostat. Try running the engine with the radiator cap off and the coolant level at full and watch for bubbles at the cap opening. If you see a large amount of bubbles this could indicate a possible escape of cylinder pressure. If you do not see any bubbleling than you should possibly change your thermostat.

Try your camshaft position sensor. A lot of people over look that part. I had the same problem in a 95 YJ and did everything you did, but when I replaced the camshaft sensor it started right up. Hope this helps. Oh yeah, and it is located in the distributer. It is the black plastic disc with the wires comming out. Took me forever to figure out where it was at first!

you need a new ballast resistor