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V8-7.4L

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AC makes noise after putting on expansion valve
Hello. It sounds like your new compressor may be failing. Flushing the system is not enough when the compressor fails. When there is debris in the system, it gets stuck in the expansion valves, the condenser, and the accumulator. If...
Question
The driver side reverse light won't work, only the passenger side light works. I've changed all the bulbs and I still can't get it to come on.
I would suspect that that there is a problem with the socket for the light bulb. Corrosion will build up in the bulb socket and not allow power, or ground, to get to the bulb. If the bulb is okay,...
Question
Q: Possible fuel pump problems?
Assuming you have the stock equipment still in your truck, it should have come with throttle body fuel injection and not a carburetor. If this is the case, you likely have a low fuel pressure issue that is preventing the...
Question
Q: Loss of power!
Hi, thanks for writing in. This sounds like a bad fuel pump and or bad fuel filter. The hard start may be a low fuel pressure cold causing the hard starting. Have the pressures tested and leak down checked to...
Question
Q: Ignition problems
Hello. If you are losing battery power to particular circuits then most of the time this is caused by a bad ground connection, a failing battery cable, or it may be a bad transmission position sensor. It is common for...
Question
Choose a carburetor for 454 Chevy engine
Hi there. For the carburetor swap out, you will need to have a least a CFM of 850 or 950 for a big block GM engine. If you are concerned about fuel consumption, then you could do a CFM of...
Question
My dash electric system is shot. Any Ideas what to fix?
Hi There, It sounds like your instrument cluster needs to be replaced. Like many other elements of your vehicle, the modern instrument cluster is electronic, and requires voltage in order to operate. The instrument cluster consumes less power than batteries...
Question
My car has a rough idle and misfires once its warmed up
Hi, and thanks for contacting YourMechanic. First of all, the mass air flow (MAF) sensor requires its screen; the air registering through the sensor is monitored with the elements in the screen. By removing the screen, you actually destroyed the...
Question
Where is the body control module located on my pickup?
The BCM is under the center console up near the front near dash. One of the seats need to be removed first, then you will need to remove center console. Once the console is removed you can then access the...
Question
Where is the body control module located on my car?
The BCM or body control module will be located under the dashboard on the driver side towards the center of the vehicle. Look to the right of the steering column towards the firewall. It will be a small black rectangle....
Question
Does my vehicle have an oil pressure sender or oil pressure sensor or both and where is it located?
Your motor (454/7.4L Big Block Chevy) should have an oil pressure sending unit that is typically mounted just above the oil filter housing. This is a relatively small unit (about the diameter or a quarter or slightly bigger) with threads...
Question
Cylinder Head inspection
I would recommend pulling the cylinder heads off to inspect considering 2 of the push rods broke. This may have caused material from the broken rods to be scattered throughout the valve train or potentially other places in the motor....
Question
No spark to coil and module
There are a number of issues that may cause an ignition system to not produce spark. A bad crankshaft position (CKP) sensor (on engines that do not have a distributor), or broken, loose or corroded wires from the sensor...
Question
1998 chevy suburban 2500 4x4 7.4 / 4l80e limp mode?
If the check engine light did come on and the trans went into limp mode, often there will be a fault code stored to shed some light on the problem. The trans fluid level and condition can be checked and...
Question
Q: Dead Battery again
You may have a failing voltage regulator that could be allowing the alternator to supply too much or too little amperage to the battery resulting in the battery never maintaining a consistent charge as it is designed to. The voltage...
Question
A/C pressure is high on both sides after compressor, condenser, accumulator, orifice change
Hi there. In general, high pressure on both high and low pressure AC sides is typically caused by an obstruction in the evaporator. In some cases, this can be a simple debris that can be cleaned if removed, while in...
Question
Low brake pedal and anti-lock brakes are not kicking in.
The brake pedal is working to stop the vehicle, but there may be air in the controller unit causing the ABS brakes to not function. I recommend bleeding the brake system from the farthest location from the master cylinder to...
Question
Normal operating voltage?
Most vehicles require at least 13 volts to operate properly. Ideal voltage is 13.8 - 14.4 volts. 14.5 volts is completely acceptable and should cause no issues.
Question
I have a 454 big block chevy suburban 85 c20 rwd and it seems to stall and misfire not allowing me to accelerate or even stop it f
Hi there. Typically when I see this issue on big block chevy engines, the first thing I do is check the distributor first. Verify the cap is not cracked, rotor is good, and the distributor is solidly mounted to the...
Question
In nevada can you have straight pips on the truck with the cat on
You would need to check with a local exhaust shop for local laws on noise and if it is legal to do the exhaust from cat back with just straight pipes. Most states it is not legal.

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