Question about 1992 Buick Skylark

2 Answers

1992 buick skylark. Not getting fuel. Has fuel pressure and spark and hits if you dump gas into the intake. DC volt meter shows 1-2 volts if connected to a fuel injector connector.

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  • mail_steve Apr 04, 2011

    Fuel pressure does not appear to be my problem. The fuel line has pressure on it when cranking.
    Any other ideas?

  • mail_steve Apr 04, 2011

    1992 Buick Skylark V6. It is getting spark and has fuel pressure. (not sure how much pressure but an oil pressure gauge reads 25 when connected to fuel line)
    I disconnected all the fuel injector plugs and tried to read voltage between wires and battery negative. Front three injectors had voltage on both leads while cranking, rear 3 injectors had voltage on only the red lead while cranking. Motor hits if fuel is dumped into manifold so spark must be OK.

  • mail_steve Apr 06, 2011

    Thanks for the tips. I will perform the tests you describe when I get back home this weekend.
    In the mean time can you send the schematic again at a higher resolution?
    I cannot read the print. Thanks.

  • mail_steve Apr 06, 2011

    Please send a higher rez schematic of the injector circuit to:
    raleigh_ranger@yahoo.com
    Thanks.

  • mail_steve Apr 09, 2011

    I looked at the Skylark some more today. With the schematic you sent I now have a better idea what I am looking for. It appears that the EMC is sending pulses to the fuel injectors. (while cranking)
    The next thing I did was remove the fuel injectors and test them. They do indeed open if I apply 12 volts from the battery. So now I am confused. The are getting pulses from the EMC but do not open from those pulses yet they will open if I apply 12 from a battery.
    I think either the pulses from the EMC are too short or they don't supply enough current.







  • mail_steve Apr 12, 2011

    Thanks for the schematic

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  • Buick Master
  • 7,689 Answers

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.

1992 buick skylark. Not getting fuel. Has fuel - jturcotte_1473.gif

jturcotte_1475.gif

Posted on Apr 04, 2011

  • 1 more comment 
  • Jeff Turcotte
    Jeff Turcotte Apr 06, 2011

    Hi, resolution is limited on FixYa. Below is a blow-up of the injectors. If you would like high res of the whole page, please send your email address.


  • Jeff Turcotte
    Jeff Turcotte Apr 06, 2011

    Thanks, I sent the diagram.

  • Jeff Turcotte
    Jeff Turcotte Apr 09, 2011

    If the pulse width to the back injectors was shorter than the one to the front injectors, that would show up in comparison of the AC voltage. It is certainly possible that the circuit relay that issues the pulse is weak for whatever reason. You would have to take the computer apart to see if you can find out why. Replacing the computer is a real hassle. I'm in the middle of helping another customer with a very similar problem, but they were not able to find a bad component in the computer. You can see our dialog if you go here: http://www.fixya.com/cars/t8900179-tryin...

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  • Master
  • 10,319 Answers

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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