Q: New SBC first start

asked by on

Newly built SBC first time starting. Comp cam, headers, intake/carb etc etc. Started up instantly fast an easy and I brought RPMs up to 2300ish for 20 minutes for break in like Comp papers said. All was well but 15 minutes in I noticed some smoke and it was getting hotter than normal. The smoke was just a minor oil leak on valve cover dripping on header. The heat was cause I was in a garage and needed more air flow. I got a big box fan on high in front of radiator now. When I went to restart it, it wont. Just cranks and spits a bit. Waited until it cooled a little and still just cranks and cranks with a pop or two. I know it has gas and spark. Timing shouldnt of moved and it was just running fine. I dont get it.

Pull one of the spark plugs to see if they are fuel fouled. The carburetor may have flooded the engine. If plugs are wet then try to hold the carburetor wide open to try and get it to crank over. You may be getting spark and too much fuel. Once it starts then it runs at normal speeds for the cam break in again. Have a certified technician from YourMechanic diagnose your vehicle’s hard starting issue in order to have the correct repairs done.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. New SBC first start

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: why doesnt my fuel gauge show me how much gas is in the tank?

There are 3 components, and wiring involved in a fuel gauge on your car. There is a fuel level sensor, also called a sending unit, the PCM (main engine computer) and the instrument panel. The fuel level sensor is...

Q: Catalytic converter gets red and lost power

There's only one thing that will cause a converter to glow red. That is too much air and fuel. The most common reason is the engine is misfiring. If your engine is shaking, and does not have power, it is...

Q: Will not start - 1994 Nissan D21

Hello. Considering the circumstances, it may be wise to take a few steps back to the very basics and do a few tests that may seem redundant. Starting issues are typically simple in nature or an electrical issue. Spray some...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...