Question about 1999 Lincoln Town Car

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No pulse,no ground to injectors 1999 lincoln town town car 4.6 engine

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If you used a noid light to check the pulse at the injector wires and didn't get any to light then the quad drivers in the ecm are bad. No way to fix this. you will have to get a new computer and have it programmed. you can get a computer at the junk yard as long as the numbers match, and there are a series of numbers that will go to that car. you have to go to the dealer to have it programmed, unless you find one with exact numbers.

Posted on Nov 10, 2010


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With key on I have power to both wires on injector. it's NOT pulsing.

with the key on there should be 12volts to the injector. the other wire on the injector is the ground side and it is grounded by the computer when it receives a signal from the cam sensor to know when to fire, ground circuit, to activate the injector. you need to check the wire from the injector ground side to the computer for an open circuit. if its good then it may be an injector driver problem inside the computer.

Sep 12, 2015 | 1999 Lincoln Town Car

1 Answer


Seems as though you have a wiring problem if your injectors have no ground.

I suggest you check the wiring diagram to see how the injectors are grounded. If they are grounded by a common point on engine or chassis repairing or duplicating it should be straightforward but more complicated if both the injector pulse and the ground are provided by the ECU.

Feb 18, 2015 | 1999 Subaru Legacy

1 Answer

No injector pulse 4 cyl 93 f250 460

if you have a $5 test light, you could find the problem. just know that all eight injectors have a constant voltage applied to them anytime the key is in run or start. and also that 4 of the injectors share a common ground, they have their ground wires spliced together before the ground wire enters the pcm to be internally grounded. and the other four injectors are the same- their ground wires splice together. so your four that don't pulse have lost either the power to them, or the common ground wire for the 4 may have broken. or lost connection.

it is easier to check the power side first, so clip a test light lead to the negative battery post or cable, turn the key to on,and probe each injector connector. one of the terminals at all eight injectors will be the power wire, and it should light up the test light. if all eight injectors have power to them, you know it must be a ground side problem. if you find that 4 injectors have no power to them, look for a broken splice in the power wire to all injectors. back in those days, injectors were "bank fired". one side or bank of the engine all had the injector grounds spliced together, so all injectors on one bank fired (pulsed) simultaneously, and then the other bank was fired or pulsed. that was good until sequential injection matched the pulse to the cylinder ready to fire, more precise, and in the modern systems each injector ground has a separate ground inside the pcm. no more splicing of the ground wires, and having bank fired engines.

when the pcm grounds the circuit, the injector coil is energized and the injector opens to spray fuel out. so the injector has constant voltage to it. only when the circuit is grounded is that power applied across the injector.

Jan 22, 2015 | Cars & Trucks

1 Answer

1999 lincon town car no power to fuel injector

Sometimes a crankshaft sensor does not send the signal to fire either the spark or the fuel injectors. If the fuel pump relay is not getting power, the inertia sensor will not have power either. The inertia reset is just magnetic and does not depend on having power to reset.

You can check for current at the Inertia sensor and at the fuel pump relay. You can also have fuel pressure at the test port without the injectors working, which is the easiest test of all,

You need the sequential firing pulse for the injectors. Have you checked the EEC Relay?

Apr 20, 2014 | 1999 Lincoln Town Car

1 Answer

My 97 lincoln town car will turn over but won't start

You need to do several things

Is the battery in good shape & have over 12.5 volts
Do you have fuel pressure at the motor key on engine off
Do you have spark or injector pulse when cranking

Mar 01, 2013 | 1997 Lincoln Town Car

1 Answer

Number 4 cylinder misfire on 1998 4.6 liter ford

check plugs and wires first for fowling, insulation burn through, bad connection, then injector cheapest test is engine stethoscope and listen to injector and see if clicking, no click check connection and voltage, if all good new injector

Jun 08, 2012 | 1999 Lincoln Town Car

1 Answer

No injector pulse


Feb 11, 2011 | 1989 Lincoln Town Car

1 Answer

The fuel injectors aren't opening. we have power to them and the crankshaft sensor and camshft sensor have been replaced. What tells the injectors to open? fuel pump is putting out 40psi at the fuel rail.

the computer gives the injector a signal to open and close check the plug to a injector 1 wire should have 12 volts all the time with key on and 1 should pulse a ground on and off when the engine is cranking over

Feb 18, 2010 | 1993 Lincoln Town Car

3 Answers

1999 lincoln town car no start

yes the teft light will stop the vehicle from running. that is the pats system and can cause all sorts of trouble. if the light flashes fast its not reading the key. no start. if it turns on for two seconds and shuts off the it should start

Feb 06, 2010 | 1999 Lincoln Town Car

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