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Matt
Matt, Engineer
Category: Volvo
Satisfied Customers: 20584
Experience:  Mechanical Engineer with 20 years experience in the auto industry, 8 yrs in formula 1 engine testing
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My 2007 Volvo S40 overheated, shut down and won't start.

Customer Question

My 2007 Volvo S40 overheated, shut down and won't start.
JA: Does the engine turn over? How old is the battery?
Customer: Battery is 2 months old and it does crank.
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: I haven't tried anything as of yet.
JA: Anything else you think the mechanic should know?
Customer: No other problems.
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the Volvo Mechanic about your situation and then connect you two.
Submitted: 5 months ago.
Category: Volvo
Expert:  Matt replied 5 months ago.

Hello

OK if the engine cranks and you have no check engine light thats staying on then I'd check some basics:

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

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

Expert:  Matt replied 5 months ago.

Hi

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