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Truck cranks but won't start - 1997 Chevy C1500
It sounds like you may have an intermittent electrical problem. I would recommend having all of the wiring that is in your fuel system checked to ensure that it is all in good condition. If any wiring has any damage...
Hello. It sounds like your transmission is failing. I usually start by checking the transmission fluid. If it is low then this will occur. If the level is fine then I usually drop the pan and drain the fluid...
Why does my '90 Chevy C1500 turn over but not start? I'm getting fuel and a spark.
Assuming the spark is adequate and fuel pressure is within specifications, an extremely worn out set of spark plugs may be the culprit. It could be a restricted exhaust system (i.e. a plugged catalytic converter) if you had a lack...
What happens if I unplug my transmission?
Hello and thank you for contacting YourMechanic. The 4L60E has electronic shift solenoids that shift the transmission in first, second, and fourth. If you unplug the harness to the transmission, your transmission will only have reverse and third gear. In...
Starting issues - 1989 Chevrolet C1500
Hello. It would be important to know if the starter is clicking, if it is trying to turn, and whether turning the key results in it clicking more than once. There are many many issues your car could be having...
How do I properly install a transmission pan back on?
When installing the pan, the mating surfaces of the transmission and the pan should be clean, dry, and free of debris. To assure a good seal, I will usually use some brake cleaner, acetone, or any other type of solvent...
Rotor moves freely about 1/4 inchback and forth
Hello. If the distributor shaft has that much play, it will cause erratic ignition timing and possible misfiring. Possible causes could be the distributor shaft or drive gear being excessively worn or broken causing the movement. Continued driving with misfires/backfiring...
Replaced a fuel module but the fuel gauge still reads empty when I know I have a full tank.
This may be related to the fuel sending unit in the fuel tank. Your fuel tank has a float type unit that sits inside of it which monitors the fuel level in the tank and transmits this information to the...
Code P0308 - 1997 Chevrolet C1500
Hi there, thanks for writing in. Have the fuel injection system cleaned and the cylinder compression tested. The intake valve may be covered in carbon deposits and having the combustion chambers cleaned. If you need to have this scoped out,...
Truck is overheating - 1992 Chevrolet C1500
There are a few things to check over. The water pump produces flow. To check this remove one of the heater hoses (small diameter) going to the heater core. Locate the hose end to a container to check flow of...
Hi there. From the description you have given, your vehicle has a combination of problems. The erratic tachometer/rpm gauge could be at fault. The tachometer signal from the ignition module could be erratic and may also be the cause of...
Motor idles fine, when you give it gas it bogged down, already changed the plugs,wires,distributor cap and rotor
Hi there, thanks for writing in about your Chevrolet C1500. It's highly likely the mass airflow sensor is bad. To verify, a scan tool should be connected and observe voltage changes in the mass airflow sensor readings. Same for oxygen...
Killed the truck and now it will turn over, but it will not start
Hi, thanks for writing in. It sounds like the fuel pressure regulator is bad and leaking fuel into the engine. This can make the engine stall, smell of fuel, not start, or even crank if engine is flooded of fuel....
Randomly shuts off no matter how much fuel is in vehicle, no acceleration/stalling when pushing pedal.
Hello and thank you for writing in! When was the last time you changed the fuel filter? The filter can have a huge effect on how much fuel is delivered to the engine. With the age of your vehicle, there...
Laboured idling and backfires
This has all the symptoms of a fuel supply issue. Such an issue can cause a lean fuel mixture and backfiring - either from low fuel pressure or inadequate fuel volume. Make sure the fuel pump relay doesn't have a...
Brake light in dash on constantly - Pedal has longer travel as if the diaphragm is not there
Hi there, The light may be illuminated because of a false reading coming from the brake fluid level sensor if there is a warning with a good brake fluid level. Otherwise, the parking brake mechanism may be sending a false...
AC tube broke and now truck is having problems.
You have already done all of the hard parts. Since you have diagnosed that the mass airflow sensor seems to be the problem, you will need to replace it. If water was introduced into the system from the air intake,...
Runs fine with the map sensor vacuum line plugged off
Hello, the map sensor is an input of engine load. When the map sensor is disconnected it will set a fault code which is emission base and check engine will come on,this cause the system to go into a default...
Truck starts. Idles fine. I give it a little gas and it wants to stall. I give half throttle or full throttle it runs fine.
Hi there. Since you're going to clean the EGR in a few minutes, that might be where your problems are coming from; that or the throttle body being coated with carbon build-up on the inside of the throttle blades. Try...
fuel pressure and map hose
Hello. The first thing that should be done is to retrieve codes. This is an OBD I system, so it is more difficult than the newer OBD II systems. Lacking any codes or scan tool data, I will have to...

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