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V8-7.4L

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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
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
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
Trucks pulls to left under braking
If it is in fact the slide pins sticking once again, try a different type of "brake lube" or caliper lube. Sometimes synthetic lubes work better in different climates. I went through a similar situation with my other half's car....
Question
Transmission problems?
If you feel that you are experiencing transmission issues, I would recommend having your truck inspected by a certified professional with experience in transmission diagnosis. If you continue to drive the truck with these issues, they can become worse and...
Question
Motor Oil?
Hi There, Contrary to popular belief, it will not hurt your engine when switching from synthetic to conventional or vice versa. In fact, Synthetic blend oils are actually a mix of conventional oils and synthetic oils. Many synthetic oils are...
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....
Question
Odometer stopped working 1994 Chevrolet K2500
Hello - your truck has a digital instrument cluster. It is possible that either a speed sensor, or something in the clusters electrical components is failing. (These are notorious for failures) There are rebuilders for these clusters who can offer...
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...

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