Question about 1981 Ford F 150

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I need to know witch wire should have power to the distributor from the ecm

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I do not know but give these websites a try www.alldatadiy.com and www.autozone.com if all fails stop by your local Ford dealership in the parts department and they be able to print you off the pictures and diagrams you will need wish you the best of luck Michigan Man.

Posted on Feb 07, 2010

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  • edgar walker
    edgar walker Feb 07, 2010

    i do not know but give these websites a try www.alldatadiy.com and www.autozone.com if all fails stop by your local Ford dealership in the parts department and they be able to print you off the pictures and diagrams you will need wish you the best of luck Michigan Man.

  • edgar walker
    edgar walker Feb 07, 2010

    i do not know but give these websites a try www.alldatadiy.com and www.autozone.com if all fails stop by your local Ford dealership in the parts department and they be able to print you off the pictures and diagrams you will need wish you the best of luck Michigan Man.

  • edgar walker
    edgar walker Feb 07, 2010

    i do not know but give these websites a try www.alldatadiy.com and www.autozone.com if all fails stop by your local Ford dealership in the parts department and they be able to print you off the pictures and diagrams you will need wish you the best of luck Michigan Man.

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1 Answer

Where does the power come from for the coil


depending on the year of the car and whether it is a ECM controlled engine. The power for the coil normally comes from the ignition switch from both the start and run positions or from the ecm. IT passes through the coil and down to the distributor either to the points or the electronic module in the distributor. Engines not using an ecm have normally 2 wires to the coil on one terminal. One wire is for the start (12 volts) and the other is for the run (7.5 volts ) as it passes through a resistor or resistor wire. With an ECM on the engine you will have to get the coil voltage reading from the workshop manual

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On my 2001 Nissan Quest 3.3L #5 cilynder miss fire replace sparkplugs, wire, distributor, and injector still miss fire so I hook a noid light to it, it won't light up at all can it be the ECM and if you...


I don't know where it is, probably under the passenger side dash. But before condemning the ECM, check the wiring to that injector. First try to determine if it is the power wire or the ground wire for the injector which is lost. With key on, the yellow power wire should have voltage on it at the injector connector. This is independent of the ECM-only the ground wire goes into the ECM, to be internally grounded to pulse the injector. The #5 ground wire is a yellow-green wire.

If you have voltage on the power wire to #5, key on, then we know either the ground wire is bad (broken or open) to the ecm -or the internal ground for that injector is out, inside the ECM.

To determine whether it is the ground wire or the ECM, you will have to locate the ECM, pull the electrical connector off to it (Be sure and take the negative battery post off, first.), then locate the yellow green wire at pin #106 of the ECM electrical connector. Now test the continuity of that wire from the injector connector to the ECM connector-use a voltmeter set to ohms. If the wire has continuity, then the ECM must have a problem- the internal injector driver for #5 may have failed. Also look for a bent pin at #106, or anything amiss in the electrical connector. In most cases, it is not the ECM but a wiring problem.
Good luck. To locate the ECM, register for free at autozone.com, listing make, model, and year. Look under "repair guides", then component locations-it should tell you the location of the ECM.

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1 Answer

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I agree, the ECM

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P0685 fault code uk ford


p0685 refers to ECM power relay control---circuit open===causes--wiring--ECM relay
Replace this relay. Check the wiring from the coil to the distributor as there is a dead short after the coil somewhere for the fuse to blow and the coil to overheat.. You may have a electronic module failure either in the distributor or the ECM

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1 Answer

93 vortec V6 4.3L No start. New CPI, New ECM,New Distributor,New Coil,


Right at the coil is the ICM (ignition control module) These wire are known for poor male to female connection have some one crank it and you wiggle it to make contact,Also where the battery is is a power ground if that ground is corroded it will give code P1355.

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1 Answer

Took need firing order on 1988 honda civic removed spark plugs wires distributorcap dont know witch wire goes where


what size engine.. do you have new wires... you need the number off the wires so you can put them in properly... because each wire will go to specific cylinder and place on the distributor

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1 Answer

I have a Ford F-150 1990 Model. It doesn't seem to be getting fire to the sparkplugs. I just replaced the spark plug wires and spark plugs. What could be the problem? It is a V8.


Sounds like its a distributor. To test if its sparking at all take the plug wire and hold a screw driver and see if it arcs to the screw driver when you crank it. but heres the best way to diagnose it on your vehicle follow the following steps and let me know from there what happens.

Steps
1 Remove the spark plug wires one at a time and insert a small screw driver into the wire.(SEE WARNINGS) Be careful as you don’t want to get shocked with 60,000volts. Hold the wire so that the screw driver is 1/8” away from the engine. Have someone crank the engine and watch for a good white spark. If you have a good spark on all wires look for a problem with timing or something else. 2 Remove the distributor cap. Have someone crank the engine over with the distributor cap removed and observe if it is turning? That is if it has a distributor cap, some newer cars don’t have one. If the distributor is not turning then likely you have a broken timing belt or chain. 3 Turn the ignition key on but don't crank the engine. Locate the positive or power wire attached to the engine coil. Using a test light check for power. If this has power, then the wiring from the ignition switch is OK. 4 Locate the negative or ground wire attached to the engine coil. Using a test light check for power. This sounds strange however, one end on a good battery ground and the other on the negative wire attached to the engine coil. The test light will light up indicating power on the negative side of the coil with the key on and engine off. 5 Have someone crank the engine while watching the test light. If you observe the test light flickering when cranking the engine and you have no spark, either the coil wire is faulty of the coil is dead. Test these using an Ohm meter.# If no flickering or pulsating was observed then check continuity in all primary circuit wiring for opens. This is the negative wire back to it's source, the ignition module. 6 Check the pulse generator in the distributor if it has a distributor cap. Some newer cars don’t have one,and if it doesn’t then the ECM or computer sends signal via the crankshaft position sensor and the camshaft position sensor. 7 With the engine in non-running condition connect your A/C voltmeter to the pair of wires at the pulse generator and crank the engine. You are looking for an A/C signal that makes 4-6 volts of A/C. If this is observed then the ignition module is dead or has a bad ground. If no A/C signal is observed then you have a dead pulse generator in the distributor. 8 Know that if this part of the primary ignition tests OK then check wiring to ECM pinouts for opens. If wiring tests are OK. Suspect the ECM or computer as a last resort. edit
Warnings
Be careful as you don’t want to get shocked with 60,000volts. be careful when checking the leads for sparks with a screwdriver doing it this way can cause very expensive damage on newer engins best use a spare spark plug or a proper tester for this job
Thanks, Midwest-tek

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1 Answer

Two wires go from distributor (350 chevy) to HEI module, 1 is green the other white witch 1 hooks to ''N'' & witch 1 hooks to ''P'' on module?


the heaver guage wire will be a power lead, the other if cheched while crancking will be a ecm pulsation for coil

Feb 10, 2010 | 2000 Chevrolet 3500

2 Answers

I have no spark i replaced the spark plugs spark wires and the coil pack and still nothing my power distribution box is fine any ideas


Crank engine with distributor cap removed, is it turning?
(That is if it has a distributor cap, some newer cars don’t have one)is it turning?
Broken timing belt or chain?

Are you getting power to the + positive side of the coil (small wires) with key on ? Hint; I use a needle pushed into the back of the plug so as not to damage the wiring.
If you have power then wiring from the ignition switch is OK. It usually is.
Hook your test light to the - negative side of the coil (one end on the - terminal and the other end on a ground). You should have power on the - side of the coil with the key on and engine off.
Crank the engine while watching the test light. Get a flashing signal at the test light when cranking?
If so and you have no spark the coil is likely dead. (don’t rely merely on resistance tests for a coil, a weak coil can test ok for resistance but still give no spark. It happens but is unusual. I learned this the hard way!)
No flashing signal?
Check continuity in all primary circuit wiring for opens.
If they are good,
It is time to check the pulse generator in the distributor. (That is if it has a distributor cap, some newer cars don’t have one, if it doesn’t then the ECM or computer sends signal via the crankshaft position sensor and the camshaft position sensor)
With the engine in non-running condition connect your A/C voltmeter to the pair of wires at the pulse generator and crank the engine. You are looking for an A/C signal that makes 4-6 volts of A/C. Got this? If so the ignition module is dead or has a bad ground. If not (more likely) you have a dead pulse generator in the distributor.
If you have three wires in the distributor signal wire you have a Hall effect sensor. I forget how to test that one. (Chrysler stuff)


If this part of the primary ignition tests ok then check wiring to ECM pinouts for opens. Wiring tests ok. ECM as last resort.
Hope this helps...........

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1 Answer

1987 MSD Distributor Cap Sparkplug Placement Help


First you need to determin witch one is #1 on cap Witch usely is the one directly behind carb. or throutle body. than its perty strate forward from there rotor runs clockwise. Cap only goes on one way. Food for thought when you chg. cap or wires one at a time is the rule even for a seasoned mechanic.

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