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Matt, Engineer
Category: Car
Satisfied Customers: 21861
Experience:  Honors degree in Mechanical Engineering, worked 8 years as a Formula 1 engine engineer.
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Opel Kadett 160i. Engine cranks, but no fuel at the injector.

Customer Question

Opel Kadett 160i. Engine cranks, but no fuel at the injector. Vehicle has single injector. All tests indicates that TPS is correct!!
Submitted: 4 years ago.
Category: Car
Expert:  Matt replied 4 years ago.

If there is a spark and its still not starting then its likely that the ECU isn't opening the fuel injector, if the injector is working you can hear them click - its difficult to hear them with background noise so use a long screwdriver like a stethoscope, placing the handle end in your ear and the metal tip against the body of the injector whilst your assistant turns the engine over.
If you can't hear anything check the ECU power is present by measuring voltage at the fusebox and on its relay socket if OK then check the connections to the crank speed sensor and consider replacing this sensor if the wiring / connections look OK

If the car will start using a squirt of quick/ easi start into the intake then this confirms the problem is lack of fuel

Also its worth checking that the electric pump that feeds the injectors is working correctly, it should run for a few seconds then switch off when you first turn the ignition on. If the connections to this are corroded or damaged then the pump could stop at any time. Check that its relay switches in and out and the relay contacts are clean and bright – replace the relay if in any doubt and do the same for the fuse, ideally measure the voltage at the pump and check its getting 12V.
You should be getting around 3 bar measured at the injector rail check to see if the plugs are getting wet indicating fuel is flowing – if not and the injectors are opening then there’s a problem with the pump or the filter or even the pressure regulator

Could also be incorrect fuelling due to a faulty water temp sensor. If this is the problem then the ECU will never add the 'cold start' extra fuel required if the car starts OK when warm then I 'd look into changing the sensor.
Customer: replied 4 years ago.

The vehicle in question does not seem to have a crank speed sensor . The vehicle still has a distributor and separate coil. if a dash of petrol is poured down it's throat the car would start immediately only to cut a second later due to no fuelling at the injector.

Expert:  Matt replied 4 years ago.

OK you've confirmed that the issue is one of fuel and these cars do have a speed sensor but they use the ignition signal from the distributor

as you've got spark then its likely the sensor is fine and it may be an issue with the wiring between the ECU and the ignition amplifier on the back of the engine bay

either that or there's no power to the ECU - or the ECU is faulty

if its seems like the last option is likely then you can get the ECU repaired - usually much cheaper than a replacement
Customer: replied 4 years ago.

Hi Matt! I took out the ECU and found a wire melted in the harness, traced the wire into the ECU and found one circuit damaged that is connected to a contact breaker! This most probably the cause of the problem. Traced the wire to the other side which is not going to the fuse box nor the ignition! could not reach the end! Any suggestions where I could have this card repaired? lives in Pretoria, RSA ! Thanks!!!

Expert:  Matt replied 4 years ago.

well done for finding the issue

try these firms: