Skip the auto shop - Our mechanics make house calls

Q: Truck won't start after replacing head gasket

asked by on

I blew a head gasket, warping the head. I had the head machined and replaced the head gasket. The 4Runner still will not start. I am not sure if the timing is off or maybe I didn't reassemble it properly.

Hi, the way to tell if it was assembled incorrectly is to do a compression test on the engine and see if you have compression on all cylinders. You may have timed the engine incorrectly and this would show up as having low compression. This engine may have been damaged because it was timed incorrectly, an example of what might have happened include, bent valves and other possible engine damage. I recommend you have a mechanic, like one from YourMechanic, diagnose why your vehicle is not starting to avoid any further complications.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: Timing?

Normally, when the headers start to glow, it is a sign that there is a restriction. Typically, the headers will not begin to glow until high rpm's are reached, which from a theoretical standpoint, are telling you that they are...

Q: Need a new pan, lug, gasket.

Hello. It is never recommended to drill a new hole in your oil pan although many have done it. The best recommendation if your oil drain plug is stripped out is to replace the oil pan. It is an extreme...

Q: Hazard lights wont turn off 2005 Toyota 4 runner

Hello. It sounds like the switch is bad for the hazards or more commonly it sounds like a relay failure. The circuit would need to be tested with a voltage meter to be able to tell for sure, but it...

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...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.