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2005 express won't start. It turn over just fine battery is…

Customer Question
2005 express won't start ...

2005 express won't start

Mechanic's Assistant: Have you checked the battery, particularly the terminal connections? Are they corroded?

It turn over just fine battery is good

Mechanic's Assistant: Are you fixing your Express yourself? What have you tried so far?

Replace crank sensor

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

I have spark at plugs

Submitted: 4 months ago.Category: Chevy
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Answered in 3 hours by:
3/9/2018
Chevy Mechanic: Matt, Engineer replied 4 months ago
Matt
Matt, Engineer
Category: Chevy
Satisfied Customers: 23,303
Experience: Honors degree in Mechanical Engineering, worked 8 years as a Formula 1 engine engineer.
Verified

Hello and welcome to Just Answer

As you have spark then check that the injectors are being operated by the ECU, its hard to hear them ‘clicking’ with back ground noise so if you use a screwdriver like a stethoscope with one end placed against the body of the fuel injector while your assistant cranks the engine

The injectors should ‘click’ as they are cycled on and off
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 you remove the filler cap to the fuel tank and listen inside while your assistant flicks the ignition you should hear it clearly
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.

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Chevy Mechanic: Matt, Engineer replied 4 months ago

My goal is to give you the best advice that I can and I hope that I've helped today. Please remember to rate my service by selecting from the 5 stars at the top of the screen before you leave. If you need more help, use the reply box to let me know.
If you're not pleased, also let me know because rating bad does not result in a refund, there are better options. Rating now will not close this post nor prevent further replies
Thanks Matt

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Chevy Mechanic: Matt, Engineer replied 4 months ago

Hi
do you still need help?
Bear in mind that the site takes a deposit from you at the beginning and this is held by the site until you rate my answer at which point the cash is split between the site and the expert. I am only paid for my work on this question if you rate my answer, using the star system at the top of the screen. Please do not forget! If you're not pleased, also let me know because rating bad does not result in a refund, there are better options. Rating now will not close this post nor prevent further replies
Thanks Matt

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