Question about 1992 Buick Skylark
Hi, you may have a bad wire from the ECM to the back injectors. Please run the checks again with your meter set to AC and check voltage on all injectors while cranking the engine. If the back injectors are not showing AC voltage, check the continuity of the dark green wire that goes to pin C12 of the ECM. The ECM is above the passenger's feet, but you will have to remove the sound insulating panel to see it. You can check continuity of the wire without removing the ECM connector if you can make contact with the wire from the back of the connector (you can gently slice the insulation on the wire along its length--the connector involved in shown in the top right of the diagram below). Remove all of the back injector connectors from their injectors, and test the continuity of each injector connector (on the terminal with the drak green wire to the back of that pin C12 on the ECM) to the same dark green wire at the ECM. With your meter set to ohms, the resistance should be zero ohms. If not, check for a break or other issue with the wire. You can cut the wire and solder in a new one, if necessary to restore continuity. Please let me know if you have any questions, and thanks for using FixYa.
Posted on Apr 04, 2011
Turn the ignition key to the ON position without starting and listen for the fuel pump to run for 5 seconds. That circuit that runs for 5 seconds is provided by the 3rd wire from the oil pressure sensor. If not heard running replace that sensor
Posted on Apr 03, 2011
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Posted on Jan 02, 2017
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A car that cranks over but doesn't start or does not fire, in many cases will be
due to a bad fuel pump, a broken timing belt, an inoperative cam sensor or
crank sensor. Also this problems are related to faulty spark plug. Check the
spark at spark plugs when you start the car. Do you notice any spark. Actually
you should see. If in case there is no spark then it's a spark plug problem.
Also the coil pack gives power to spark plug. So check the voltage at coil
pack. It will show 12 volt.If there is no voltage noticed at coil pack then its
faulty coil pack that has to be replaced.If all the possible options checked
out ok then check the car starter. The starter gets power from battery to start
the care. If the starter is faulty then it will not let the car to start. Also
check and confirm that there is fuel in the car. If its very low fuel then in
some cases this causes the problem. Also check and confirm that fuel pump is
functioning properly and the fuel filter is not clogged. One of the easiest
ways to check for a fuel pump related problem is to spray a little starting
fluid into the air intake while trying to start the car. If the car starts
momentarily, then there's a good chance the fuel pump is not working or the car
is out of gas. You can also listen for the fuel pump's humming sound when the
key is first turned on. Also if a inoperative fuel pump is suspected, a good
technician will always check to verify there is power and ground being supplied
to the pump, to eliminate the possibility of a bad relay or electrical issue.
Fuel pressure can be checked with a pressure gauge and if there is pressure,
pulse can be checked at the fuel injectors in several ways including the most
common, with the use of noid lights. If the injectors don't have pulse the
engine won't start. ---------- This troubleshooting tips will help you to solve the
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