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L6-4.0L

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Question
Won't crank/ start
Hi There, What you are describing sounds like the starter may not be aligned with the flywheel properly. As you know, when you turn the key and the starter solenoid engages the starter, a small gear comes out and engages...
Question
My jeep wont go over 35mph. 2001 Jeep Grand Cherokee
Hello - if this loss of performance was rather sudden (i.e. overnight or within a week or so), a failed throttle position sensor or fuel pump could be the problem. If this happened gradually, over months lets say - this...
Question
97 Jeep grand Cherokee lerado stalling/shutting off
It sounds like you may have more than one issue with the vehicle. The crankshaft sensor is the most common cause of the stalling or no start on these engines. They will also cause problems when you try to increase...
Question
My throttle position sensor can not be fixed
Hi there. This article on the P0122 OBD-II error code is a very good one for you to read. It outlines what causes this code, common mistakes made (which it appears your mechanic falls into a few of these), and...
Question
shifting problems and the vehicle will not go backwards. Plus it will try to lunge forward in park.
Hi there. What could be the issue is the main valve to the transmission may have disconnected from the shifter lever on the side of the transmission. Raise up the vehicle and put it on four (4) jack stands. With...
Question
Transmission shifts up and down randomly.
Hi There, What you are describing sounds like possibly a bad speed sensor or potentially a faulty transmission control module, which also controls the speed sensors. The transmission control module has various sensors such as vehicle speed sensors, wheel speed...
Question
The power locks and windows will not work when a door is open.
The wiring to the switches that control the locks and windows travels through the door and enters the car body through a flexible, usually rubber, conduit. Over time, repeated opening and closing of the door(s) causes stress (mechanical flexing) of...
Question
No heat, antifreeze leak, overheating engine
Hi...stop leak products should never be introduced into a car engine's cooling system simply because such aftermarket products are not a factory authorized or factory sanctioned repair technique. Some factory service manuals are indeed emphatic on this issue. A stop...
Question
Overheated, power steering went out and battery went low
Hi There, What you have described sounds like your serpentine belt may have come off. As you may know all of the accessories (ie alternator which charges the battery, power steering and the water pump) are driven by the serpentine...
Question
Transmission slipping even when I had the transmission replaced.
Hi there. If the transmission was slipping and you had the transmission replaced and the transmission is still slipping, then there could be an issue with the shifter cable or downshift cable. Check the cables and see if they are...
Question
O2 sensors
The O2 sensors are sensors that indicate the way the engine is running. If the sensors see the engine running lean then they will indicate codes for the engine running lean. Your engine may have problems other than the O2...
Question
Reinstalling fuel pump back into tank
If you are not using an OEM, dealer supplied gasket, but rather an aftermarket supplied gasket, that could cause this problem. The gasket you have may simply be too thick. Even if the gaskets are of the same thickness, there...
Question
I have a ticking noise in the front axle in my 99 Jeep Cherokee 4x4.
Hello, thank you for writing in. The ticking noises you are hearing may be coming from the actual axle itself. The CV joints on both sides of the axle can click or tick as they wear down. You would hear...
Question
Our ignition isn't working when starting
Hi There, It sounds like you may have a faulty starter relay. The starter relay directs power from the battery to the starter solenoid which then engages the starter when you turn the key. When this is not working properly,...
Question
My jeep won't stay running.
Most of the time, the hard to start issue you're describing is caused either by the crankshaft position sensor or the electrical harness attached to this component. Since you've replaced most of the ignition system components, you might want to...
Question
My engine is surging at 2500 rpm's.
Hi there. First check the ECM for any codes that are present. If the codes are logged for the camshaft position sensor, then check harness to the camshaft position sensor and make sure that there is a reference voltage. If...
Question
Starting issue
Hi There, What you are describing generally is caused by a weak battery or a faulty starter solenoid. If the re is a rapid click, this is likely a dead battery. Depending on whether you changed the starter or the...
Question
2005 jeep wrangler harmonic balenciaga replacement
Engine and transmission mounts are replaced on a mobile basis by certified mechanics dispatched by YourMechanic. The service to request is motor/transmission mount replacement. Harmonic balancers are relatively long-lived but there are a lot of variables that affect service life....
Question
I have a 1990 Jeep Cherokee with some weird stalling issues.
Hi there. Seems that the troubleshooting is leading to the transmission. When the vehicle goes into drive or reverse, if the transmission is lock up or the converter clutch is active, the engine will stall. When tapping on or turning...
Question
Car won't start or crank
Hi there. What voltage reading are you getting at the battery, terminals, wire, and starter; a voltage drop test will confirm if there is any resistance. What were the battery test results? Current voltage, cold cranking amps, state of health?...

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