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Matt
Matt, Engineer
Category: Volvo
Satisfied Customers: 20611
Experience:  Mechanical Engineer with 20 years experience in the auto industry, 8 yrs in formula 1 engine testing
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I have a 1999 volvo c70 that won't start. according to the

Customer Question

I have a 1999 volvo c70 that won't start. according to the mechanic that looked at it, it has a good fuel flow and turns over strongly. He mentioned something about a module but couldn't diagnose it because he didn't have the right equipment. Can you tell me what might be causing this?
Submitted: 10 months ago.
Category: Volvo
Expert:  Matt replied 10 months ago.

Hello

I'm assuming that the car has a check engine lighgt on and you still need to have a diagnostic device plugged in to read off the fault code?

I'd also reccommend doing some basic tests - while you're searching for a garage with the right diagnostic kit to do this

1st check for spark by removing one of the spark plugs and plug it back into its lead and rest it on the metal of the engine ( DO NOT hold it on place by hand) then have your assistant turn the engine over whilst you watch the plug. It should give a fat blue spark at regular intervals.

If not then check that there's power to the coil pack (at the other end of the plug lead) using a meter. If there’s 12V at the pack but no spark then check the ECU power supply (fuse and relay) and also the connections to the crankshaft speed sensor.

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

Expert:  Matt replied 10 months ago.

Hi

do you still need help?

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