Question about 1985 Mercury Grand Marquis

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Car will not start unless you prim it. I checked the injectors for pulse when I was starting it and got none. However, when I get the car running, I can check for pulse on the injectors and I will be getting it then.

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I have Found this to be True and To Apply No Start Condision Also IF this Helps YOU Help ME and
And RATE ME Please and Have a Good DAY !!

Article No. 86-4-20

Poor vehicle performance, (especially during hot weather) may be due to insufficient voltage at the high pressure (in tank) fuel pump. The condition may be corrected by changing the fuel filter and installing a jumper wire to bypass the pump resistor.
1. Locate the fuel pump inertia switch (Sedan: the switch is on the trunk hinge - Station wagon: the switch is at the rear of the vehicle in the passenger compartment).
2. Set a voltmeter, Rotunda Number 014-00407, to read 15 volts or more. Connect the voltmeter between vehicle ground and either side of the inertia switch. (If the vehicle does not run, make sure the inertia switch is not open.)
3. Start and run the vehicle in PARK position and read the voltage.
4. If voltage is below 8.5 volts, change the system fuel filter (located under the vehicle on the vehicle right side just in front of the rear wheel well on a crossmember), and recheck the voltage.
5. If the voltage remains below 8.5 volts, install an overlay wiring harness to increase the voltage above 8.5 volts.
6. Install the overlay wiring harness by attaching the large ring terminal to the battery terminal of the starter relay. Remove the connector from the "I" terminal of the starter relay and insert the male pin of the overlay harness into the connector. Install the female connector from the overlay harness onto the "I" terminal. Tape or install the overlay harness into the existing wiring harness bundle.
7. Start the vehicle, recheck voltage and recheck vehicle for proper operation.
E6AZ-9A350-A Wire Fuel Pump Overlay C
OTHER APPLICABLE ARTICLES: None WARRANTY STATUS: Reimbursable within the provisions of the Warranty and Policy Manual. OPERATION: SP9350A86 - Check only. TIME: 0.4 Hr. - Station wagon 0.3 Hr. - Sedan OPERATION: SP9350B86 - Extra time to change filter. TIME: 0.5 Hr. OPERATION: SP9350C86 - Extra time to install harness. TIME: 0.3 Hr. DLR. CODING: Basic Part No. DRIVE - Code: P1, P2, P4

Posted on Jan 21, 2009


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Fuel Delivery Problem


Although you say the fuel pump is working properly, you still need to ensure that there is actually fuel getting to the rail, and the easiest way to do this is to first of all clamp the fuel return line from the fuel pressure regulator so that the fuel flow back to the tank is restricted. Now try to start the engine. If it starts and runs, or starts and then cuts out after a few seconds, then you need a new fuel pressure regulator.

If the car still won't start then pop the fuel inlet pipe off the fuel rail, hold it in a glass jar or bottle, and then have someone switch on the ignition so the pump primes. You should get a good jet of fuel from the pipe. If not then you need to turn your attentions to the fuel filter and the fuel pump and its built in check valve.

Next you should use a volt meter or a 12v test lamp to check for battery voltage at the fuel injectors. each injector has 2 wires to it, and one of these wires should have battery voltage to it with the ignition switched on. If not then you need to check the injector harness connector for security and condition, and check that none of the wires in the injector harness are nipped or crimped anywhere, and repair as required.

If the voltage is there then you know that the problem is a lack of injector pulse, or too short an injector pulse, and as you have already replaced the ECM twice, I personally would double check the injector wiring and then fit a new camshaft sensor and see if that solves the problem.



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