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V8-7.4L

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Question
I need to pass smog test.
The code that you are getting is typically caused by an evaporative emissions vent valve that has failed. A mechanic would typically remove the valve and test it with an ohm meter and even apply voltage to it to see...
Question
Head gasket leak
Hello. Leaks, especially from the head gasket, are problematic because they can lead to overheating and engine damage. This is something that you will want to take care of sooner or later. I would recommend having a technician locate the...
Question
Ignition key stuck
It sounds like you are going to need to replace the ignition lock cylinder. I would have a technician come out and inspect the lock and see if they can get it to turn off and replace the key lock...
Question
Fuel pressure test leaks
Hello there. It sounds like you have a few things going on with your 1996 GMC C2500. While I commend you on wanting to check for leaks in the fuel system, this is a little tougher than you would think....
Question
How to set a carburetor on a big block 454? I think the carburetor is a 600 cm
Hi - As excited as most of our team would be to work on a classic, big-block 'Vette, that is not a service we can offer at this time. I would check references by other Corvette forum members on a...
Question
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 car is from California and the smog pump was removed, runs poorly.
The smog pump blows clean air into the exhaust until the engine reaches operating temperature. Once the exhaust gets hot enough, the extra air isn't required to lower tailpipe emissions and a valve opens to divert the air away from...
Question
Transmission engine comparability
Hey there. As long as the engine you have currently bolted to the 700R4 is NOT a 4 cyl or V6, it should bolt up to the TH400. TH350s, TH400s (except those in a Jeep), and 700R4s (except as noted...
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
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
My clutch hits the floor was running fine, then I checked reservoir and it's full
Hello, thanks for writing in. The master cylinder is connected to the clutch pedal and the slave cylinder is connected to the release bearing. When the clutch pedal is pushed down, hydraulic fluid flows from the master cylinder to the...
Question
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
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
I have a 1979 Chevy 454 big block will it fit in my 1989 chevy
Hi there: In regards to actual fitting issues, it should be good, as long as you use the flywheel that mounted to the original transmission. However, you're most likely going to have issues with fuel system, and electrical systems matching...
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
there is intake pushrods I broke two of them and bent the rest started to smoke and it smells like fuel what would cause this
Hi there: In most cases, a push rod breaks or bends when there is a gap between the lifter and the push rod tip. This can happen if the valve hardware gap is too wide. Other issues that can cause...
Question
Do I have to remove the upper intake manifold to replace my fuel pressure regulator ?
The fuel pressure regulator on a sequential fuel injection system is inside the intake manifold on this engine and the upper intake needs to be removed for access. Make sure to replace all gaskets and seals when manifold is removed....

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