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L6-4.0L

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when i start my 2001 jeep Cherokee up, there is an electronic humming sound
Hello, thank you for writing in. Walking through the diagnostic process, we can rule out the wheels and suspension as a cause for the humming, as it happens as long as the car is running. The next step is attempting...
Question
P0123 code 1999 Jeep Wrangler
Hi there - this may seem like a wild shot, but I wonder if your torque converter lock-up clutch is failing to release as you coast down, and the engine is having to fight it? I would think you would...
Question
stalling engine
Hello there. Usually this type of issue is caused simply by clogged or dirty fuel injectors or the throttle body being dirty. When an engine gets warm it is more dependent upon the efficient flow of vaporized gasoline. When the...
Question
Blinker problem
Hello, thank you for writing in. There may be a couple of issues going on. With this kind of issue, you will benefit from using a voltmeter to test the power supply to various switches. There are three components you...
Question
the air blower to select where the air is blowing isnt working the only thing till do is blow on the dash.
Hello, thank you for writing in. There may be one of several things happening. There are "blend doors" located in the duct work that control where the air flows. If the servo-motors that control these doors fail, or the switch...
Question
Can I try using blue devil head gasket repair even if I'm not even sure that the head gasket is the problem?
You can try the Blue Devil head gasket repair fluid. The only thing is if the cylinder head has a crack, the gasket repair will not effect aluminum or cast iron. For the conditions that your described, either the Idle...
Question
Hazards work but turn signals don't. Replaced the circuit boards relay and bulbs. I have a 99 Grand Cherokee.
If the relay and fuses were replaced check to see if the flasher is working. If there is power to the flasher but nothing past the flasher, then the flasher needs replaced. If there is no power to the flasher...
Question
Spark plug closest to firewall /on 4.0 grand cherokee has oil on it
If you are getting oil in the back cylinder then you either have excessive oil getting into cylinder from valve seals from low oil flow in the valve cover area from too thick of oil or lack of oil changes....
Question
I am trying to fix my headlight but there is left over aluminum stuck in the connector. Will that cause a fire?
If there are left over pieces of broken metal material left in the connector, these may cause a short if they contact any other metal surface. If this is not the case, you may be okay but it would be...
Question
installing a upper radiator hose, about an inch down the piece you slide the hose over has a raised lip, do i slide hose over lip
Hello, thank you for writing in. Correct, you want to place the hose clamp between the two raised lips. If the hose will willfully go over the second lip, that is fine. The goal is to have the hose beyond...
Question
Jeep won't turn over after sitting for 8 hours 2001 Jeep Cherokee
Hello - I would first check the battery cables and ground straps for corrosion, or other poor-connectivity problems. A strong battery can be hampered by poor connections, which will sometimes finally pass current. A failing starter solenoid (burned contacts) will...
Question
1999 Jeep Cherokee idles fine, loss of power at higher rpm. Cruise control stopped working at the same time. Stalls at stopped when revved up from idle.
The cruise control switch could have an issue and may have shorted the contacts inside the switch terminals. For the engine stalling after pushing on the throttle pedal, there could be either a vacuum leak on the engine or the...
Question
When I hit the gas sometimes it will take off fast then sometimes it feels like it has no power at all struggling to go
Hi There, There are a number of things that may cause the car to hesitate when accelerating such as low fuel pressure, a dirty or faulty mass air flow sensor, clogged or dirty fuel injectors, a faulty throttle position sensor...
Question
Turn signals don't work
Hi there. Check the fuse to the turn signals and see if its blown. If the fuse is not burned, then check the wiring from the switch to the turn signal lights. Use a digital ohm meter and see what...
Question
Have an electrical issue under driver side 2000 Jeep Cherokee Laredo
Hello - the block connectors you describe are no doubt part of the vehicle wiring harness, and are likely not available as separate components. In addition to repairing the fender (or fender liner) hole you mention that is causing water...
Question
My 94 jaguar idles rough, stutters then cuts out. This happens when engine is cold or warm.
Check for a vacuum leak on the engine. A vacuum leak will cause the engine to rough rough and stall out when the engine is cold or hot. If there is no vacuum leak, then the Mass Air Flow Sensor...
Question
My 2001 Jeep Grand Cherokee Laredo inline 6 runs but sometimes doesn't start until we disconnect positive battery wire
A properly installed sound system should not be causing any problems. However, I've seen many sound systems whose installation was problematic and sometimes even dangerous. I have trouble imagining what could be wrong that would be corrected by pulling the...
Question
No thermostat new water pump still overheating
Running an engine without the thermostat can cause the engine to overheat due to the coolant passes through the engine too fast and will not let the coolant absorb the heat from the engine. If you reinstall a new thermostat...
Question
Crossed spark plug wires? 1997 Jeep Cherokee
Hello - "crossed spark plug wires" means simply that your plug wires are not attached to the plugs and/or the distributor in the correct firing order. Your cylinders are numbered 1 to 6, front to rear on your engine. The...
Question
Car rough idles sputters and jumps rpm after changing ignition coil cap and rotor.
Check the spark plug wires on the distributor and on the engine. It seems that you have one or more wires crossed and the engine is firing on the wrong stoke causing the engine to run rough and make the...

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