Engine cranks but does not start

Christa,

There are four things needed for the engine to run, fuel, ignition spark, compression, and correct ignition timing.

In most cases, either fuel or ignition spark is likely missing. You hear the fuel pump, but it may not be producing what is needed. If the engine sounds normal when cranking, try this. See if it starts for a couple of seconds using starting fluid and then stalls. If it does, then we know it is a fuel-related issue. If there is no change, I need you to check for ignition spark to the plugs. Here is a link that explains how that is done:

https://www.2carpros.com/articles/how-to-test-an-ignition-system

Try this first and let me know the results. Also, if you can record the engine cranking and upload it for me to hear, it may be helpful. I can usually tell if it is a timing issue or low compression.

Take care and I'll watch for your reply.

Joe

Hi,

You indicated, "I'm not having a no crank issue as well, I turn the key and nothing. I jumped the ignition wire off of the starter to battery positive and it cranks fine. But with it connected it will not." When you say you're not having a no crank issue, does the starter engage or do you mean it does nothing at all?

As far as the crankshaft position sensor, I believe on this one it is behind the timing belt. However, if it started with starting fluid, the sensor should be fine.

So, we need to confirm what the fuel pressure is. To me, it sounds either weak or not working at all.

However, before we jump to testing pressure, I would like to check fuses and relays. However, I need to know the engine code. There are four different codes related to 2.0L. See pic 1 below. Each code provides me with a different wiring schematic, so I need to have the correct one.

To locate the code, you can check for a metal tab at the front of the cylinder head or a sticker on the timing cover. If they are not available, see pic 2 to locate it on the rear of the engine.

Let me know which one it is.

Take care,

Joe

See pics below.

Hi Christa,

If it isn't cranking, we need to focus on that first before we move ahead. I attached the starting system wiring schematic below, so you have a reference.

First, see if it will start in neutral. If it doesn't, we need to check if there is power at the starter.

If you note in the pic, there is a black wire to the starter that has 12v at all times. The red wire with a black tracer should only get power when the key is in the start position. Get a helper to turn the key for you and confirm if there is power or not on the red/black wire.

Here is a link you may find helpful:

https://www.2carpros.com/articles/starter-not-working-repair

Let me know what you find.

Joe

See pics below.

Hi,

I really don't like the voltage draining that fast. Is there anything as far as wiring near or around the battery that looks damaged?

As far as the code is concerned, it is related to the transmission range sensor. When I asked if it started in neutral, that is what I was trying to determine. If there was a problem with that sensor.

If you look at the pic below, I included a pic showing the sensor location and the sensor.

Start there and check to see if anything is shorten or damaged.

Next, if you are drawing that much power that quickly, something is getting hot. Pay really close attention to this, heat. When the battery is connected, feel the battery cables, open the fuse box and feel the fuses and relays, and note if any are hot.

Let me know what you find. Also, please be careful at this point. This heavy of a battery draw can lead to a circuit overheating and causing a fire.

If you are finished for the day and haven't found the cause, disconnect the battery.

Let me know.

Joe

Christa,

I would like to say yes, but in most cases, the code provides a starting point. Here is what I suggest. Take a look through the diagnostics below. (Pics 1-4) Is this something you feel comfortable doing? Also, the remaining pics explain how to both remove and replace the range sensor and how to adjust it. See if the adjustment is the issue.

Again, when you have the battery attached, check for electrical wires, relays, fuses, and modules to see if any are hot.

Let me know.

Joe

Christa,

It makes sense that the sensor could be bad, but please understand, I can't guarantee it. As far as the battery goes, how long does it take to go from fully charged and drained?

Let me know.

Joe

Christa,

When you say 15/20, are you referring to seconds before the battery fails? If that is the case, please make sure to disconnect the battery when you finish for the night.

As far as the sensor is concerned, if the testing indicates all is good, then the sensor must be bad. I attached the directions below for the removal and installation of the transmission range switch. Let me know if you have any questions.

Also, don't be upset with me, but I am very concerned about the battery failing that quickly. Are you certain there was nothing getting hot? Did anything have a hot smell to it?

Let me know.

Joe

See pics below.

Christa,

That is just a torque wrench, and really nothing special. VW loves to show everything needed and then give them a part number. I swear they do it on purpose. LOL

If you don't have one, a parts store will lend one to you. Or we can just make sure all the bolts are tight.

Let me know if you have other questions, and don't worry. We'll get through this.

Take care,

Joe