Skip the auto shop - Our mechanics make house calls

Q: no spark

asked by on

i just rebuilt the heads on a 97 5.7 vortec. everything is back together and im tring to get it to fire but no spark im getting fuel but not getting spark i have replace the ignition coil icm, distributor, and the crankshaft position sensor. still nothing i have hooked up a scan tool to the obd2 and im throwing a code p0336 and its for the crankshaft position sensor. i replaced it again still nothing.. any ideas?

My car has 264000 miles.
My car has an automatic transmission.

You’ll need to look in the engine compartment’s fuse box and check the ENG-1 fuse and all of the other fuses to see if you have any are blown. The crankshaft sensor’s pink wire should have ignition switch power at the sensor. If you lose this ignition power from fuse ENG-1 then the crankshaft sensor and other sensors will not get any power. If it is blown then you’ll need to find what shorted the pink wires to most of the sensors and O2 sensors. You may have shorted the wire and blew the fuse.

If you need some assistance with these checks, consider YourMechanic, as a certified technician can perform these checks and accurately diagnose your starting issue firsthand. An accurate repair can then be done once the issue has been pinpointed. 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 wont start

Hello. You need to have a positive reading at one of the posts. If you do not, then you have a voltage issue. You would need a voltage meter to check the voltage supply. Once that is fixed, then the...

Q: The car won't start

Hi, thanks for writing in. Usually, when you hear a single click, it means that the starter is bad. A good diagnosis of this is taking a small wrench or hammer and knock on your starter a few times. If...

Q: Can you put vortec heads on 86 350 with high top pistons

Hello. The Vortec heads should bolt up to the 86 350 block, however, they will require a different manifold and engine management system. In regards to the high top pistons, I would calculate the compression ratio that should theoretically be...

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...
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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...