If your Tomcar engine turns over, but the Tomcar will not actually start, then check through following items:


Faulty coil pack

 

Test the ignition coil with a multimeter to check for voltage. 


Using a noid light or oscilloscope check for ignition coil's trigger pulse.  


Replace coil pack if necessary.

 

High tension leads

 

Check HT lead connections.



Check HT leads for any visible damage, splits or cracks. 


Check HT lead resistance using multimeter. 

Check for moisture in HT lead ends.

 

Spark plugs

 

Inspect all the spark plug electrodes and gap between electrodes, adjust if required.
Replace if any are faulty, worn or damaged replace. 
You can purchase new Tomcar spark plugs here.

 

Electrical connections 

 

Inspect all the electrical connections on and around the engine wiring loom and ensure that they are all correctly plugged in, no damaged or have moisture present.  

 

Fuel Pump & Relay


            If you have the necessary equipment, run a fuel system pressure test. If not, simply check the electrical connections. 

 
Test the positive side of the fuel pump for current with a circuit tester or multimeter. 

Ensure that the ignition is in the “on” position.
Note: The fuel pump relay only primes once for around 5 - 10 seconds when the ignition is first switched on. 
After the first prime the fuel pump will not switch on until the engine cranks over or the ignition switch is cycled. 

If there is no current, check the fuse. 
If the fuse is okay, check the relay. 
 

If the relay is okay but not switching check the connections from the ECU to the front power distribution module. 


If the fuel pump receives ignition 12v but not operating it is possible that the pump has failed. 


Remove and replace with new pump.


 

Fuel filter

 

If the fuel pump is working properly and fuel is still not reaching the engine, the problem could be a blocked fuel filter or have failed pump impeller failure.  
Check the fuel filter for blockages and replace if necessary.
Check fuel hoses to kinks, leaks or possible damage. You can buy fuel filters here and here.

 

Loose starter 

 

Ensure that the starter motor is mounted securely. 
This can cause the vehicle not to start.

 

Fuel injectors 

 

Check all the fuel injectors and connections.
To check fuel injector actuation, check fuel injector resistance using multimeter, use a noid light or oscilloscope to check injector pulse. 
Remove injector and carry out leak test in necessary. 
If injectors are faulty remove and replace if necessary. Please ensure .

 

Damaged ring gear or starter bendix 


If one of these items teeth become worn or damaged, the starter will spin but not engage. 
You will hear loud screeching, scrapes and grinding if this is the case. 
Replace flywheel or bendix if this occurs.

 

Faulty ECU

 

If the ECU has internally failed this may cause your engine not to start.
Check the main ECU connectors for moisture or debris, clean and reconnect.  
You may need to plug in a diagnostics scanner to check for fault codes. 

 

Faulty speed sensor (Crankshaft speed sensor)

 

The crank angle speed sensor  has an air gap of 1mm between the phonic wheel installed on the flywheel and the sensor. If this gap is too large this will need adjusting.
Check the voltage at the sensor and use an oscilloscope to check the pulse (pulse is only generated when engine is turning) 

 

Faulty MAP sensor

 

 Check the MAP (manifold absolute pressure sensor) is tight and secure. 
Check sensor O rings is not cracked or missing.
Using a multimeter check the resistance or the sensor.
The sensor can become blocked and dirty, use a carburetor cleaner and gently clean the sensor.  
If still faulty replace is necessary.

If you have any questions at all, please call us on 1800 TOMCAR or email us on support@tomcar.com.au
 

If you need any parts mentioned in this article, head to our online store and order what you need.