I have a 1987 300zx turbo no spark or fuel ether replaced coil still no spark I was driving it one 2days ago and the hornest got burned a fusable link for the fuel injection went out replaced it but now no spark or fuel have any ideas........?
Turn the ignition switch OFF. Disconnect the fusible link connector for the fuel injection wiring harness. Be sure the ignition is OFF
before doing this. Disconnect the cold start valve wiring harness
connector. Disconnect the high tension lead (coil-to-distributor) at
the distributor and hold it 0.13-0.25 in. (3.3-6.3mm) away from the
cylinder head with a pair of insulated pliers and a heavy glove. When
the engine is cranked, a spark should be observed. If not, check the
lead and replace as necessary. If there is still no spark, go on with
the following system checks.
Make a check of the power supply circuit. Turn the ignition OFF. Detach the connector from the top of the IC unit. Turn the ignition ON.
Measure the voltage at each terminal of the connector in turn by
touching the probe of positive lead of the voltmeter to one of the
terminals and touching the probe of the negative lead of the voltmeter
to a ground, such as the engine. In each case, battery voltage should
be indicated. If not, check all of the wiring, the ignition switch and
all connectors for breaks, corrosion, discontinuity etc., then repair
Check the primary windings of the ignition coil. Turn the ignition OFF.
Detach the harness connector from the negative coil terminal. Use an
ohmmeter to measure the resistance between the positive and negative
coil terminals. If resistance is 0.84-1.02 ohms, the coil is OK;
replace it if the reading is far from this range.
If the power supply, circuits, wiring and coil are in good shape, check the IC unit and pick-up coil as follows:
Turn the ignition OFF.
Remove the distributor cap and ignition rotor.
an ohmmeter, measure the resistance between the two terminals of the
pick-up coil, where they attach to the IC unit. Measure the resistance
by reversing the polarity of the probes. If approximately 400 ohms are
indicated, the pick-up coil is OK, but the IC unit is bad and must be
Fig. 10: Connect the ohmmeter to the pick-up coil terminals-1979-83 modelsFig. 11: Remove the screws (arrows) to detach the IC unit-1979-83 models
If the resistance is other than 400 ohms, proceed with the following:
Be certain the two pin connector to the IC unit is secure.
Turn the ignition ON.
Measure the voltage at the ignition coil's negative terminal.
Turn the ignition OFF.
WARNINGRemove the tester probe from the coil negative terminal before switching the ignition OFF, to prevent burning out the tester.
If 0 voltage is indicated, the IC unit is bad and must be replaced.
If battery voltage is indicated, remove the IC unit from the distributor, by proceeding as follows:
Disconnect the battery ground (negative) cable.
Remove the distributor cap and ignition rotor.
Disconnect the harness connector from the top of the IC unit.
Remove the two screws securing the IC unit to the distributor.
Disconnect the two pick-up coil wires from the IC unit.
WARNINGPull the connectors free with a pair of needlenose pliers. DO NOT pull on the wires to detach the connectors.
Remove the IC unit.
the resistance between the terminals of the pick-up coil. It should be
approximately 400 ohms. If so, the pick-up coil is OK and the IC unit
is bad. If the resistance is other than 400 ohms, the pick-up coil is
bad and must be replaced.
It's possible the fuel filter is clogged up. If it has been a while since you changed the fuel filter, it may need to be changed. It is either located in the tank or between the tank and carbeurator. You may also have gotten bad gas or water in the gas. Check this also.
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Try squirting starter fluid or ether into the carb. If it takes over you might have a blocked fuel filter. Then see if you have spark. Just pull the wire and connect to an old plug or get a tester. Make sure your hands are insulated. If you have spark then check timing. Could be the coil if there's no spark. Also could be a Passlock Sensor.
Hi, Ok you have confirmed that it's not a fuel problem. You need to check for spark. Pull the coil wire off of the coil(secondary lead-looks like a spark plug wire) Have some one crank it over and listen for a popping sound. IF yes, spark is at the coil, that means all ignition sensors are working. Next check for spark at ends of wires after cap. IF no replace cap and rotor. IF yes remove a couple spark plugs and check for fouling(wet, fuel etc...) IF yes replace or clean plugs and retest for starting. IF no spark is present at coil you need to scan computer and watch for rpm signal. IF no rpm signal, replace crankshaft sensor with OEM delco part. BIGGEST problem with these engines is Cap and Rotor burn out.
It sounds like you may have burned out your fusable link. It's a special wire that comes off the starter solennoid and is designed to burn off in the event of an overload. DO NOT REPLACE IT WITH REGULAR WIRE, THIS IS A LEADING CAUSE OF CAR FIRES.
You will want to check for what caused the overload condition that caused the fusable link to burn out in the first place.
Check the spark, remove the fuse to the fuel pump and remove one of the spark plugs. Connect the plug to its lead and position it well away from the engine against the truck frame (do not hold it) and turn the engine over, check the spark. If no spark it most probably a faulty coil. Check the impedance of the spark plug leads and replace any that are much higher than the rest.
My guess is that you have spark but no fuel, What?... OK this is what I think is wrong. Your pump is fine when at position 2 on the ignition switch however when you switch to position three to fire the engine the power to the fuel pump is momentarily disconnected. A leaking fuel pressure regulator or injector would drop the pressure in the fuel line and at the same time flood the engine making it impossible to start. Once you start the engine with ether the ignition is back to position 2 and the pump can make good any loss in pressure but because the intake mix is rich this will cause the engine to run rich too.
A good fuel system is capable of delivering 40 - 50PSI of fuel pressure and when switched off up to 90% of this pressure should be maintained for about 5 minutes, if it cannot check out the fuel pressure regulator and injectors. The fuel pipe should be capable of filling a pint pot in about 15 seconds, if it cannot check out the fuel filter is clogged.
Hope the above gives you some pointers