Top 20 1991 Jeep Wrangler - Page 6 Questions & Answers

check for fuel presuure at the shraitor valve check gas filter for beinging clogged or real dirty when removed,you may have a problem with the electronic module or broken wires in distubutor,remove distubutor cap & make sure rotor is turning when you crank the motor over inside distubutor,there is a series of checks when you have a problem like that,fuel pump in gas tank my be bad

If the master cylinder and the slave cylinder were replaced, was it because there was leakage there?
Also, are the hoses perfect, or when you press on the pedal is there a visible bulge (may need a friend to look at it or press the pedal for you)?

If the problem is not in the hoses, slave, or master cylinder for the clutch pedal, then it's within the manual transmission. A rebuild of the mechanical clutch parts past the slave cylinder may be required to rectify this situation.


--- BLEEDING THE SYSTEM 1987-93 Models

1. Fill the reservoir with clean brake fluid.
2. Raise and support the vehicle on jackstands.
3. Attach one end of a rubber hose to the concentric bearing bleeder screw and place the other end in a jar, filled halfway with clean brake fluid. Make sure that the hose will stay submerged.
4. Loosen the bleeder screw.
5. Have an assistant press and hold the clutch pedal to the floor. Tighten the bleeder screw with the pedal at the floor. Bubbles will have appeared in the jar when the pedal was depressed.
6. Have your assistant release the pedal, then perform the sequence again, until bubbles no longer appear in the jar.
7. Lower the vehicle and test the clutch.

1994-95 Models The clutch master cylinder, slave cylinder and connecting line are sealed units and are prefilled with fluid at the factory.

when running does the guage on dash read at least 14 volts. it could be a bad battery. when engine is off, there should be at least 12.8 to13 volts at battery. when engine running there should be at least 14 volts at battery. with everything off. if 14 volts is not getting to battery then it may be a bad alternator not charging battery properly. have a good day !! if it is getting proper voltage, then battery is at fault.

Worn spark plugs and /or spark plug wires are the most common cause. Not sure what maintenance was performed, but with the info provided, this would be the first place I would suspect.

With an oil filter(recommended)5.7 litres or 6 qts

Sounds like you have a heat transfer problem. First, on a 91, it's likely that the inside of your radiator is partially obstructed with calcium, rust or both. I know that you flushed it but often the flush will go around the obstruction and will only clean the parts that are already flowing (does little good). Rust does not dissolve easily using over the counter flushes and flushing in the vehicle often leaves debris in the tank which will get right back into the core as soon as you start the engine up again. sometimes it can be commercially cleaned, other times you need to just replace it. Air flow can also be impaired...check that the a/c condenser and the face of the radiator between it and the condenser are clean and not packed with bugs, leaves or other debris.

there are 4 nuts or bolts its very easy

You might check the fan,if it has a thermostatic clutch on it.
It should spin up with the same speed as the engine.And free wheel when the engine is first started. If it looks lazy,and just barely turning, in the heat of being stoped in traffic it may be whats causing the overheating.

There are two phillips screws holding in the bezel. Remove them and pull out the assembly with the wires attached. Twist (or sometimes pull) out the bulb socket from the bezel. Now push down on the bulb and untwist at the same time. Take the bulb to the parts store to match up with a new one, and reverse the process.

My 1991 Wrangler would alternate between no spark and no fuel. After replacing the crank sensor, the coil, and the fuel pump twice I started chasing wires looking for a bad ground. There is a black with a yellow stripe wire that comes out of the rear body harness between the front e brake mount and the front door post(very hard to get at)right above the bottom dash edge that should be securely grounded to the front e brake mount. As soon as I secured that ground everything worked properly again.

maybe you broke the crank sensor upon dismantle/removing.... or adjust the sensor gap.

Not Available ,on a vehicle that old

The tubing should be good,just replace the rubber
hose part,by the radiator cooler.

Other issues?

Jeep did not have a ignition control module for either engine this year. Are you sure you this is the name of the component your looking for?

Unfortunately it looks like you have fried your ECU as well. Get the diagnostics done and if it can be read than fine, if not you need to get new one.

Hi. look carefully under the hood as there is usually a sticker showing this. Also, look in the owner manual. If all else fails go to any NAPA store and ask them for a copy of the diagram from their database. J.

please explain what you mean by leak detection ?? for what ---

Remove the bolts holding the slave cylinder to the transmission. Disconnect the hydraulic hose. Reconnect hydraulic hose to new slave cylinder, and install the slave cylinder in it's original position.

Now proceed to bleed the line through the slave cylinder until a solid stream of fluid comes through, and the pedal pressure becomes firm.

I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514

It should be under the hood towards the leftside of the motor.Thanks you for asking and I hope it helps.Please leave me a 4 thumbs up.

Mine was recently doing the same thing. In order to get it to work with the way it was wired, we had to change one of the glass tube fuses that runs the radio. The problem was that the radio and the dash lights were wired together. So if you had the radio and the dash lights on they would both blow. Don't know if this is a common problem though.

There should be a small master cylinder for the clutch right next to the brake master cylinder, mounted more towards the fender. Remove the top cover and look inside. Regular brake fluid is used in the clutch system. If it's low, likely you have a leak so check where the rod goes through the firewall under the dash, the line itself and the slave cylinder (some are outside the bellhousing, others are inside and fluid will leak from the bottom of it.