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Idle sounds real rough
This may be a sign of a failing idle air control valve. The idle air control valve is located on or near your intake manifold that monitors the air intake as it is mixed with fuel prior to being injected...
Replaced throttle positions sensor but still experiencing hesitation and stalling out
Hello. You should have the TPS you put on verified that it was installed correctly first. Have the vehicle ECM scanned for codes and check the data for the TPS voltage signal to be within specifications. You did not mention...
My car was overheating and when I turned the heater on, it would blow cold air. I just replaced the thermostat and my car is still overheating
Hi, thanks for writing in. This is likely due to bad coolant circulation. This can the be the result of several issues. Due to the fact you just replaced the thermostat, the issue may be due to another clog in...
Cylinder 1 misfire
Hello. You will need to have the cylinder compression tested and if it is okay then check the fuel injector to see if it is getting an injector pulse from the computer. If you have injector pulse then remove and...
Getting a check engine light, P0138 error: "O2 Sensor circuit High voltage (Bank 1, sensor 2)"
Hi, thanks for writing in. I wouldn't worry about it. The only purpose of the downstream O2 sensor is to monitor the health of the catalytic converter. You have four O2 sensors. The two upstream sensors monitor fuel mixture (Bank...
Won't stay started.
Hi, thanks for writing in. This sounds like you may have a problem relating to the electrical draw of the instrument cluster or potentially a short somewhere causing this excess draw of power. When one component in the electrical system...
Runs good for first half hour or so then starts to hesitate and lurch
When we have symptoms that show up after the car warms up, it is definitely temperature related. There is an important factor here that will need to be considered. A cold motor is operating in what is called open loop....
My car is overheating even after replacing waterpump and thermostat
Hi. It sounds like the heater core is clogged and restricting the flow of coolant in the coolant system. There is also the possibility that the new radiator is defective and is causing the car to overheat. The head gasket...
I have to push the accelerator when I crank up my truck up to keep it from turning off
Depending on the engine maintenance that has been done on a regular basis you may need to have a diagnostic check done to check the condition of the ignition system, fuel system, and the computer sensors for an issue like...
Starting in the morning
Cold weather can effect your car in a number of ways. To start, we need to know if the engine is cranking but not starting. If the engine is not cranking, or has a slow crank on cold mornings, your...
What could cause blown turn signal fuses if the turn signal switch and the flasher relay have been replaced?
Hello there, a few common faults will cause your turn signal fuse to blow repeatedly on your 2003 Jeep Grand Cherokee. If the blower and turn signal issues started at the same time its very likely there is a short...
Oil pressure - 2000 Jeep Grand Cherokee
Hello and thanks for your question. If your oil pressure gauge is showing low pressure all the time with the engine running, then the gauge may be faulty. If your oil pressure gauge is showing low at idle and when...
Car won't start - 1999 Jeep Grand Cherokee
I would go back to "things you know have been messed with," and start from there. Get a good service manual, and pull the timing cover off to re-check the timing gears for proper camshaft/crankshaft timing. Don't assume anything. Once...
transmission not catching gears and over revs
Hello and thank you for your question. It seems that the 3rd and 4th clutches inside the transmission are slipping. This is the reason why you are hearing a ticking noise under the transmission and it seems to not shift...
All of a sudden it dies while driving?
Hi, thanks for writing in. This could well be a failure of the fuel pump relay, or the crankshaft position sensor. Both electronic components which can start failing from heat/use, then cool off and work again. Over time, sometime a...
Engine rebuilt
If you had a piston skirt broken off inside your engine, it would not be running as it would have immediately caused major internal damage. The tapping sound you hear may be anything from simply low oil, to a worn...
Too much hot air coming in the cabin through the vents
The first thing to do when you feel access heat from the vehicle is to check the cooling system. Chances are likely something has failed. Always start by checking the level of the coolant. If it is full, then you...
Thinking about switching to synthetic oil.
I would recommend using a simi-synthetic high mileage oil rather than straight synthetic. High mileage oils are designed to reduce friction and have extra additives embedded that assist in removing unwanted deposits. As far as the reason your engine struggles...
I have a 97 Jeep Cherokee that won't start. When I turn the key over, the Brake Warning Light comes on as if the parking break is on
Hello and thank you for contacting YourMechanic. The brake light is tied into the alternator and also the neutral safety switch. If the alternator is not producing enough voltage, then the brake light will light up. If the power is...
Shifting issues on jeep laredo
As you may know, the speed sensorslocated on the input and output shafts of the transmission relay information to the transmission control module which controls when the vehicle shifts based upon shift points. When these sensors are relaying incorrect information...

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