Skip the auto shop - Our mechanics make house calls

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.

Was this answer helpful?

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: What does the low fuel warning light mean?

Your vehicle information display is capable of providing a number of different warning messages. The low fuel warning means exactly what you think it means. It will display with the word “Warning”, as well as the image of gas pump....

Q: When cranking the engine, there are a few sparks on the ignition coil and then they cut off

That green key light flashing is the vehicle's immobilizer system. The system either does not recognize the key, or has not received the key ID, and stops the engine from starting. This is why you see some sparks, then it...

Q: Car wont start and electronics acting up

As long as no water has gotten into the car, sight unseen I would suggest checking for loose connections. Positive and negative battery cables, not just at the battery. Check the other ends - where the positive cable connects to...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...