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L6-4.0L

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Question
jeep started to act up and stalls randomly at slow speed or at a stop.
Hi there. An engine that randomly stalls, can be caused by any number of things. A fairly common stalling issue for the 4.0L is, a faulty CKP (crankshaft position sensor). This could be accompanied by, although not always, a check...
Question
Caliper replacement causing uneven pad wear
When it comes to working on brakes you will not find a mechanic out there that will only do a partial job when it comes to brakes and your safety. The slides for the calipers will get seized inside the...
Question
Got a check engine code of 1899
Hello. The symptoms you describe can be caused by a few different things. If you are showing code P1899, for a park / neutral safety switch that is stuck in gear then it may be possible that the switch needs...
Question
Shut off
Hello. Are you noticing any other symptoms with the vehicle? There may be several systems that can shut down a vehicle while driving. Even if you are not receiving any diagnostic troubleshooting codes, you should attempt to have the vehicle...
Question
Electrical power drops out completely while driving.
A faulted automatic shutdown relay or asd relay is a common concern on your vehicle model and can show the same symptoms. I have seen this problem caused by the relay as well as corrosion inside the under hood fuse...
Question
Rear window washer works when up but, stops when closed.
Hi there. It sounds like you have broken wires in the harness to the lift gate. The harness that feeds from the body to the door is constantly being bent back and forth; similar to when we remove a soda...
Question
My brake light and ABS light came on today while driving home from work I checked it out put some fluid in it
Hello. Adding brake fluid to the system was a great idea. Although it did not turn off the ABS light, you can use that to your advantage. The light means the computer is detecting a problem, and you can scan...
Question
No spark but turns over
Hi there. The PCM (powertrain control module) generating codes 32 EGR system fault and 55 end of message, leads me to believe the PCM is functional. Circuit test(s) need to be performed, using a test light check for power at...
Question
Bad instant acceleration on high speeds. Works just fine on low end speeds 0-60.
Hi there. It is possible, the fuel pump and/or fuel filter is responsible for the lack of power at freeway speeds. It could also be, the exhaust system is restricted ie; restricted/plugged catalytic converter. The lack of acceleration at low...
Question
When I'm driving about 40 mph my Jeep Cherokee left wheel gets louder and when I turn left it makes a loud noise down there. What
Front end noises can be caused by a few different components. First, to eliminate the tires as a source, try rotating the tires. Solid axle 4WD vehicles can experience tire wear that can cause excessive noise. Run your hand across...
Question
Shifting problem
This may be a sign of low transmission fluid or a faulty transmission control solenoid. As you know, automatic transmissions use pressurized hydraulic fluid to change gears. Every time a gear change is required, the car's computer activates a transmission...
Question
Grand Cherokee 1999 Side Swiped Door Replacement Possibly.
My first recommendation would be to determine how many miles the vehicle has and memorize it. Then I would look over your vehicle and give it your honest opinion of its condition (assuming that the doors were fixed). Then I...
Question
Misfire on my engine and I am getting an injector code 27. (OBD1)
Hi there. The injector output driver is not responding properly to the control signal. Check the wiring from the computer to the injector driver. If the noid light is flashing erratically, then the controller (computer) is not functioning correctly. You...
Question
Power lock will lock passenger door but won't unlock them
Hi there. There could be an issue with the power lock fob for your vehicle and may need replaced. If when you push on the unlock button and you don't hear anything, then the button on the power lock fob...
Question
2002 Wrangler. Replacing an air control valve. After installing, is there anything special we have to do?
This is a relatively simple process that generally includes unhooking the old idle air control valve and plugging in the new one. Here are some simple steps to follow: Scan the computer system in the car for codes Check...
Question
I have a 99 jeep grand Cherokee Laredo. .I am experiencing a loud ticking noise and at lights sometimes and especially when I shu
Hi there: If you're loosing coolant, but don't see it leaking on the ground, it's possible that it might be leaking internally inside the motor. This could be a serious engine issue that should be inspected as soon as possible....
Question
Jeep will turn over and try to start but shoots back pressure out of the intake
Hi there. If it is shooting pressure back through the intake then either the valve timing is off or the crank sensor is not reading correctly. I would typically start by checking the compression. If the compression is off on...
Question
Location for speed sensor?
Hello. It sounds like your transmission is in "limp mode", causing the 2nd gear start operation. If you can get the problem codes that are setting the Check Engine light, it will help in your diagnosis considerably! Most auto...
Question
My Jeep is flooding itself out after shutting it off and starting it back up
I would check the coolant temperature sensor, which is an input to the fuel injection. If it has failed and is sending the engine an incorrect temperature reading, the engine will get too rich a fuel mix and will be...
Question
My car is briefly shutting off when driving and stalling out when stopped.
Hello. Stalling issues can arise from a variety of faults. Have any warning lights come on? You may want to have the vehicle scanned for codes anyway. Typically you turn to the fuel and spark first to make sure they...

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