Engine turns over but will not start

Hello,

This sounds like you have a crankshaft position (engine RPM) sensor that is not working. Here are two guides to help us get started by walking you thought he steps with diagrams below to show you how to replace the sensor on your car.

https://www.2carpros.com/articles/crankshaft-angle-sensor-replacement

and

https://www.2carpros.com/articles/car-cranks-but-wont-start

Check out the diagrams (Below). Please let us know what happens.

I got a new sensor took me about 30 minutes to do the job.

Car turns over but does not start I previously replaced an anti freeze hose and took it for a test drive. During that time I think the temperature of the car got to high causing the engine to shut off. I have had the same anti freeze problems in the past and it would usually alert me "High temperature" and I would pull over with and add more antifreeze and it would always start back up, It did not alert me this time and engine shut off automatically and tried to do the same, add more anti freeze and it would not start back up this time, I feel like I fixed most of the leakage but possibly a very slow leak in the antifreeze, but I am not sure where its all going. with that said there is multiple codes, but two new codes came up that says pending codes, P0688-ECM/PCM power relay sense circuit and P0343 camshaft position sensor A-bank 1 circuit high input. I'm thinking it's P0688 code that is preventing it from starting. My question is how do i solve the problem and get get my car running again? Thanks.

Hey Austin

Yes I would check the PCM relay because that would make it not start, I have a guide here that could help you though with further testing

https://www.2carpros.com/articles/car-cranks-but-wont-start

Please check things out and get back to me please.

Best, Ken

Once every 3 or 4 weeks the motor will not start after we have been driving the car for a while. The motor turns over all right, but will not start. If we wait 40 or so minutes, then it will start.

When this happens, have you checked if the engine is getting spark and fuel?

I have a passat 2003 when you start it, it starts and goes off immediately. when idiagnosed it, i got the code p1570 what do ido

P1570 = Engine Control Module Locked.

You would need to adapt Montronic Engine Control Module (ECM)-J220- to electronic anti-theft immobilozer.

Also try a capacitive discharge. This means you unhook the battery and touch the cables together and then reconnect.

Hi 2 car pros
I emailed you about 2 weeks ago asking about a starting problem. I sent a $10 donation. I have not heard from you. I am awaiting your reply.
Madison Dengler
mdengler@hotmail.com

Hello Looks like one of our master techs has already responded to you one day after your donated post. Take a look at it and follow up on the question so that tech can further assist you.

It was running drove to work 5 hours later try to start and it won't start it's been 4 moths new battery and still

Does the starter turn?

Does the engine turn when the starter turns?

Does the check engine light come ON when the key is in the ON position?

Is the timing belt ok? What engine?

Is the fuel pump relay ok (if gas)?

Do you have spark and fuel spray from injectors?

A tow to a garage + 1/2hr to 1hr labor, and you will have an answer.

Thomas

no spark or gas

Go to this link:https://www.2carpros.com/articles/car-cranks-but-wont-start

check all fuses

Check engine reads
17536 system too lean
16706 rpm sensor
G28 no signal intermit
Error in mapped cooling system check
Temp sensor / thermostat
Car runs and drives fine only issue is won't start
First to second try, starts third try
Temp Gage's works and car is not over heating
When I started it in the morning it fired up fine
But second time I started it an hour later didn't work
Feed back is much appreciated thank you

Hi Stevewalley7,

It sounds like a classic crankshaft angle sensor shorting out, but we should do some testing before replacing it to make sure we are barking up the right tree, when it doesn't start we need to check for fuel pressure and ignition spark, please follow these links to start,

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

and

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Please let me know what you find :-)

Best, Ken

I will check those asap and what about the other codes
Or could that one cause those to malfunction
Another person thought it was a speed sensor and
Mass air flow sensor what do you think?

Hello Stevewalley7,

The code that really stands out is the crank angle sensor engine rpm code, this sensor will cause all kinds of problems. I would try replace the crankshaft angle sensor and see what happens, follow this link for more info

https://www.2carpros.com/articles/crankshaft-angle-sensor-replacement

its not the same as your, but gives a general idea

Best, Ken

Okay i will try that. Today when i was driving the battery light came on then it said "alternator workshop!" It still drove 30 miles home after that happened and after driving a while the battery light went off do you think this has something to do with the crank shaft angle sensor

Hi Stevewalley7,

That sounds like the alternator is failing, boy when it rains to pours! whilethe engine is running check the voltage output,, here is a guide which can help you

https://www.2carpros.com/articles/how-to-check-a-car-alternator

Let me know what you find

Best, Ken

Have parked my car down for over a year and its not starting, I change the plug yet its not starting but I noticed the car plug get wet with fuel, and the timing belt is intact.. What can I do.. The battery is ok.. Its rolling, just not starting

Check to see if you are getting spark to the plugs. Also, if you are getting spark, check the fuel pump pressure.

battery, alternator and starter are all good i took it to advanced and they did testing.

Thanks For the reply.... Yes the plug get spark and the fuel pressure is ok.... But I noticed the plug get soaked with fuel and the timing belt is ok too cos I checked it... But I noticed that when I tried to start the car the engine rolls very fast could it (that the engine valve have bend or what do you suggest? Thanks for being there

Hi Stevewalley7

It could be related to the crank angle sensor since that is the most relevant code, most things that says workshop are computer sensor related lets start by replacing the CKS (crankshaft angle) sensor.

Let me know what happens

Best, Ken

Okay, if the engine turns fast, there is a loss of compression. Either bent valves or the timing is wrong. Please keep in mind, the belt may have jumped a few teeth and still look good, but be off. You need to check that again and tell me what you find.

It over heated on me and i took it in the guy fixed it and said i had a bad temp sensor and it has not ever heated and battery and check engine lights still on also the alternator workshop! light goes off every once in a while but as i said i had tests ran and the starter battery and alternator are fine the mechanic i just took it to didnt check the codes or reset them should i just buy a scanner was thinking of getting a vag obd2 any advice helps thank you for everything

But can a parked car valve bent? What actually happened was that I misplaced the car key... A guy just decoded the car key for me.. And gave me another keybut before the key got lost the car was working perfectly, though have parked it for over a year now. So dats why am asking that is it possible for a parked down car valve can it got bent? Or what do u suggest?

has not over heated since*******

If the engine is off, you can't bend a valve. I didn't know that. If the engine is turning fast, however, there can't be enough compression to start the engine. You are getting gas and spark because you said the plugs were wet and you had spark. I need you to check engine compression. If you need directions, go to our homepage under the diy section.

Let me know what the compression is in all cylinders. If you can and want, video tape it so I can hear what is going on. I could tell you right away if the compression is to low. Also, while sitting, you may have had a couple valves stick open.

also which code shows crank shaft angle sensor?

Yes there is no enough compression for the car to start, the plug spark and the plug get soaked with fuel and the engine turn very fast.. Dats exactly what's wrong.. So what should I do

Hi Stevewalley7

The code 16706 rpm sensor, is the crankshaft angle sensor.

Please let me know.

Best, Ken

Sir, if you get spark and fuel, have good compression, and the timing is correct, the engine has to run. It has no choice. You told me it turns fast, faster than it did before? If so, the compression is low.

What makes the compression low sir and what do they have to do?

Really cold where you are located?

The medic

No its not, am in lagos in nigeria and weather here is very hot

A stuck valve can cause low compression. If you check engine compression, I can point you in the right direcion. If I am wrong, then we need to check the timing. Since the car sat for so long, there is a chance that a few valves have stuck in the open position.

For directions on checking compression, visit our homepage under the DIY section. It isn't hard to do. You will need a compression gauge. Most parts stores will lend or rent them to you.

Let me know what you find. Also, if you can send a video and upload it for me to listen to, it may help.

If your valve guides are dry---when you turned the engine over initially, they may have stuck in the "open" position----spring's can't make them return to closed----just a thought

Do compression test

The medic