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1994 Nissan 380zx - it will turn over but won't start

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1994 Nissan 380zx - it will turn over but won't start
Submitted: 2 years ago.Category: Nissan
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Answered in 28 minutes by:
6/9/2015
Nissan Mechanic: Matt, Engineer replied 2 years ago
Matt
Matt, Engineer
Category: Nissan
Satisfied Customers: 22,154
Experience: BEng hons Mech engineering, worked in auto industry for 22 years on engine, transmission and suspension design
Verified
Hello
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
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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Nissan Mechanic: Matt, Engineer replied 2 years ago
Hi
do you still need help?
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Customer reply replied 2 years ago
No i found out my main engine control module went out
Nissan Mechanic: Matt, Engineer replied 2 years ago
Sorry to hear that
if you haven't already then I can reccommend either of these 2 firms to get it repaired
http://www.the-ecu-doctor.co.uk/
http://www.bba-reman.com/uk/
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Customer reply replied 2 years ago
I already have a part on the way but thank you :)
Nissan Mechanic: Matt, Engineer replied 2 years ago
No problem
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. so if my answers have been helpful please rate my answer.
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Matt
Matt, Engineer
Category: Nissan
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Experience: BEng hons Mech engineering, worked in auto industry for 22 years on engine, transmission and suspension design

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