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.

A: Pull one of the spark plugs to see if they ...

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.

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Fuel leaking from vehicle

If you have a fuel leak, you should have the car checked-out by a technician to determine where the leak is coming from. Leaking fuel can be very dangerous, and should be addressed as soon as possible. If the fuel...

Q: My car turns over but it has no spark and won't start

I would recommend starting with checking the ignition coils for spark as well as the spark plug wires. Oftentimes ignition coils are a problem when it comes to producing a spark, especially on a vehicle of this age. Also, try...

Q: I purchased a new computer for it does it need programed

You would need to have it programmed to your VIN. Have the computer scanned to see if you have a good crank shaft signal first, before replacing the ECM. You may not need the ECM replaced; you may have a...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...