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99 dodge ram 5.9 magnum try to start but wont

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99 dodge ram 5.9 magnum try to start but wont
Submitted: 2 years ago.Category: Dodge
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Answered in 3 minutes by:
2/28/2016
Dodge Mechanic: Matt, Engineer replied 2 years ago
Matt
Matt, Engineer
Category: Dodge
Satisfied Customers: 23,206
Experience: Honors degree in Mechanical Engineering, worked 8 years as a Formula 1 engine engineer.
Verified

Hello

I'd check the basics

If there is a spark and its still not starting then its likely that the ECU isn't opening the fuel injectors, if the injectors are 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

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.

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Dodge Mechanic: Matt, Engineer replied 2 years ago

Hi

do you still need help?

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