Skip the auto shop - Our mechanics make house calls

Q: Will not start.

asked by on

I changed the engine from 97 to 99. Do I have to put the crank sensor and cam sensor from the 97 onto the 99?

My car has 140000 miles.
My car has an automatic transmission.

The sensor will be the same. What you need to make sure of is that the new motor has the tone ring installed on the balancer. The same goes for the camshaft sensor. A missing tone ring is a very common issue with motor swaps. The year of the motor rarely makes a difference. They are still the same motor.

Once you have confirmed there are tone rings for both the camshaft and crank sensors, the next thing to do is to figure out what is missing. Every ICE (internal combustion motor) needs fuel pressure, injector pulse, spark and camshaft timing to run. Figure out what is missing and diagnose the truck accordingly. Something else that is often overlooked, if the replacement motor is a used motor, they will often need some oil squirted into the cylinders to give them enough compression to start. This is normal and does not mean there is a problem with the motor. Don’t squirt so much oil in that the cylinders will hydrolock. A few squirts from an oil can is all that is needed.

Another often missed item, if the replacement motor is used, the injectors can become stuck. Simply use a small hammer to tap on them while attempting to start the motor. This needs to be done with care. Use a stethoscope or small hose to confirm the injectors are working. You are listening for a clicking noise. If you don’t here it, either they are not getting injector pulse or they are sticking from sitting for to long.

I recommend the following inspection to help you figure this out. Car is not starting

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

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: Transmission temperature sensor is acting up. Can it be changed?

Your vehicle should have an AODE / 4R70W transmission and the transmission temperature sensor is located on the Valve Body (brain) in the oil pan. Remove the transmission oil pan and drain out the oil. Remove the oil filter and...

Q: New starter making grinding noise.

Throughout my experiences working on them, I have come to learn that grinding sounds coming from Ford trucks are actually not that uncommon. There can be a few different solutions to eliminate these noises depending on what part is doing...

Q: Water logged

Hello. Water can get into a number of different placed and cause the car to run like this. The most common is the air filter and air filter housing. If the air filter becomes wet then this will occur. I...

Related articles

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...
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...
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...