'94 vw 2.0 wont start.it has sparks and fuel to the fuel rail, however i think that the injectors are not getting the pulse signal in order for them to work. What can I do to fix this problem? Your help will be much appriciated. Thanks

Make sure battery has a full charge and battery connections all good. If it cranks good but won't start, have a helper crank it while you visually check for spark at the plugs. If spark everywhere, use a gage and check proper fuel pressure. Also, check fuel injector pulse. Having fuel in the fuel rail is good as far as it goes. You don't need rpm signal for initial prime.
Any applicable trouble codes?

if donor motor was a runner
should have worked and started no issues

if fuel and spark is there
something not connected
crank angled sensor

if engine light is on has fault codes

I'm having a similar issue with my '97 Golf K2 with a 2.0 I checked the resistance to the crank sensor and it was almost 900ohms with the replacement one being 500 ohms. Changed it, didn't work.

Mine was running fine driving 70MPH on the highway and just shut off. Now it cranks, fuel pump runs and it seems to be getting fuel but still no spark. I have a coil/module on order and will try it tomorrow.

UPDATE

Replaced the coil. Coil sparks once when you first turn the key on, that's it. crank sensor has already been replaced yesterday.
Injectors seem to fire (I smell fuel if I crank it a while) but still no spark.
I have 12V to the coil and 12V when cranking.

I see tons of posts with this issue but no resolutions. Come on somebody has to have been here before....

UPDATE #2

I do NOT have an injector pulse or a pulsed signal to the coil. When I crank the car the oil pressure light blinks on and off (just noticed this not sure if it is relevant)

I do get a check engine light when I turn the key on and when cranking, thought this meant ECU was good?

Any other way to test the ECU?

Could the pick up in the distributor be bad? Doesn't the pick up signal the ECU to fire the coil and injectors, I thought the crank sensor was just a TDC reference point?

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Launch X431 Master

look for new alternator.

For a no start , cranks over ok. be sure you have fuel pressure at the fuel rail first, before checking the injectors. There should be more that 40 psi at the rail... if not .. you might have a fuel pump problem. Even if you have fuel pressure at the fuel rail... the next thing I would check for,,, is spark !! Make sure you have spark at the spark plugs. The order would be... fuel pressure first and then spark , , then injector pulse. !! Then plugged exhaust.... then bad fuel then engine timing. The injectors have power to them all the time. The PCM controls the ground to the injectors. So you would have to monitor the ground side of the injectors. So checking injectors is kinda complicated. Hope this helps you. Good luck.

If it cranks normally, it is obviously not the starter relay; if it were the relay the starter would not operate. To begin with, when the vehicle is not starting you are going to have to determine whether it is losing spark, fuel pressure, fuel injector pulse, or some combination of these things.

You can check for spark by removing the coil assembly, plugging 4 known good spark plugs into the plug connectors and laying the plugs agaiinst the metal engine. Then have someone crank the engine over while you watch under the hood to see if the plug is firing.

To check for fuel pressure, you will need a fuel pressure gauge, connecting the fuel pressure gauge to the fuel rail test port, you can measure the pressure in the fuel system when the problem is occurring.

To check for injector pulse, you will need a logic probe or a noid light to check for injector signal (fuel pulse) at the injector electrical connector.

In order to begin diagnosis, you need to check these three things to determine what system the fault is in. Once this is determined, pinpoint testing down to the component level can be performed.

Hope this helps; also keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using Fixya, and have a nice day.

check to see that they are receiving power to pulse with a multimeter, then possibly try a new ECU if you can get a hold of one

Thee are a couple of things left to check. One is to hook up a fuel pressure gauge to the fuel rail and see how much pressure your getting and compare it to specs. It maybe getting fuel there but not enough pressure. To see if the injectors are being pulsed you wil need a set of noid lights. You will unplug an injector and plug in the noid light. It will flash everytime that injector is pulsed. If it never flashes your injector drivers on the ecu are bad.

See these items:-

The starter must have been bad due to the water.

Bad PCM or ignition coil.

Corroded battery cables.

See timing belt.

Good luck

check the fuel pressure at the reed valve on the fuel rail,it needs at least 55psi of fuel to push through injectors and start up.