Skip the auto shop - Our mechanics make house calls

Q: with the#1 piston up were should the rotor button be pointing

asked by on

If I have the #1 piston up were should the rotor button be pointing when I pull the distributor cap off.
My car has an automatic transmission.

The rotor button should be pointing to the number 1 position on the distributor cap when the number 1 piston is at top dead center (on the compression stroke). The pistons come up two times during the combustion cycle. Once for the exhaust stroke and again on the compression stroke. The mechanical ignition timing should be set so that the rotor hits the corresponding cylinder on the compression stroke to ignite the air/fuel mixture.

If you need some assistance with this, consider YourMechanic, as a certified technician can come to your location and help you with this is person. Good luck.

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

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: Truck idling higher than normal.

I would recommend taking the vehicle back to the facility that replaced your TPS and ensure that the throttle body gasket was replaced as well. If the gasket was not replaced a vacuum leak may exist near your throttle body...

Q: Brake changes on my 2007 Kia Picanto

You may not need brakes but should get them inspected to see if they are worn down or just noisy. If you are having to replaced the brakes every 4000km or six months, then you have issues with the calipers...

Q: Transmission

Hello. It sounds like your transmission is failing. I usually start by checking the transmission fluid. If it is low then this will occur. If the level is fine then I usually drop the pan and drain the fluid...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
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...