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1993 Oldsmobile regency I replaced the motor and crank it…

1993 Oldsmobile regency I replaced the...
1993 Oldsmobile regency
I replaced the motor and crank it ran for few minutes and now I am not getting fire
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Answered in 7 minutes by:
3/17/2018
Matt
Matt, Engineer
Category: Car
Satisfied Customers: 22,895
Experience: Honors degree in Mechanical Engineering, worked 8 years as a Formula 1 engine engineer.
Verified

Hello and welcome to Just Answer

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 this is OK 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 2.5 bar ( 50 psi) 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

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Thanks Matt

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Customer reply replied 1 month ago
I just change the cam sensor it’s starts and few minutes later it stops and now again no fire on the plug wires

Hello

when it stops I'd next use a meter to check that there's still 12V on the ECM fuse in the fusebox under the hood

then also check the resistance of the crank / engine speed sensor as it should be about 200ohms across the 2 pins

if its greater than this then replace the sensor

Matt
Matt, Engineer
Category: Car
Satisfied Customers: 22,895
Experience: Honors degree in Mechanical Engineering, worked 8 years as a Formula 1 engine engineer.
Verified
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Matt
Matt, Engineer
Category: Car
Satisfied Customers: 22,895
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Experience: Honors degree in Mechanical Engineering, worked 8 years as a Formula 1 engine engineer.

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