From what you describe it sounds like maybe the EGR valve is being commanded to open when it shouldn't be.
What you could try to confirm that's what is happening is switch the ignition on then unplug the valve harness connector to see if you hear the valve close when you remove the connector. Try connecting it and disconnecting it a few times and listen for any noise from the valve. I don't think there should be any noise from the valve when the engine isn't running.

 

Thanks for Reply. I Won't get a chance until weekend to try this as I need to get car back from garage as they have gave up with it. If this is the case what could be the cause of it ? Thanks Colin

 

If this is the case what could be the cause of it ?

I think the most likely cause would be a short to earth on the valve control wire, meaning the wire could have chafed to the engine block or the car body somewhere.

 

I have finally got car back tried connecting and disconnecting valve harness but no sound coming from Valve. Got diesel too injectors but doesn't seem to be full pressure.

 

I have got full fuel pressure at rail car still will not start. Discovered today when trying allsorts that light on dashboards saying immobiliser is on. Tried spare key also bit just the same. HELP

 

light on dashboards saying immobiliser is on. Tried spare key also bit just the same. HELP

What is the light doing?
The immobiliser light is supposed to come on along with the other warning lights when you first switch the ignition on. That's normal. It should switch off during crank. If there is no immobiliser light when you switch the ignition on, or the light flashes, that means there is an immobiliser fault.

 

Serves you right for buying a Hyundai.

 

Have you got a Hyundai Big Stu seeing as you are on a Hyundai Forum site.

 

So is the engine not starting at all now? Even with the EGR valve disconnected?
No smoke from the exhaust doesn't really tell you anything on a 2008 model. It will have a DPF so there isn't usually any smoke from the exhaust even when it's running.

 

No Engine is not starting even with EGR disconnected

 

Have you tried spraying some Easy Start into the intake to see if that gets it running?
If you remove the plastic cover from the top of the engine you'll see a big hose right at the front that connects to the intake manifold. Remove that hose then get a helper to crank the engine over while you spray short bursts of fluid into the manifold. See if that gets it started.

Yeah, BigStu is obviously not a Hyundai fan. Makes you wonder why he took the time to sign up to a Hyundai forum. He's probably the latest member of the Off-Topic Lounge gang.

 

Thanks for reply. Didn`t want too go down the easy start route if I could help it. I knowmy way around engines so know where it goes. Thought about trying crankshaft sensor not so good with electronics is there an easy way too test sensors ?.

 

The way I usually check the crank sensor is to monitor the fuel pump power supply voltage during crank. Unfortunately there isn't a pump check connector on the Tucson so there is no easy place to connect the meter. Inserting a thin wire into the output terminal of the relay socket on the fusebox then fitting the relay on top of the wire would probably be the easiest way to connect to the pump circuit on your car. The output terminal is the one near the center of the relay socket...see below. If you get approx 10V on the pump power supply circuit DURING CRANK you can feel pretty confident that the crank sensor is working. The only problem with this test is no voltage doesn't necessarily mean the crank sensor is bad, so you'd need to do some further testing if the relay doesn't switch on. Especially on a Tucson which has some known issues with it's engine bay fusebox...see link below.

2007 Tucson - fuel pump wiring issue

 

Thanks for info how to test hopefully get a chance in morning. Yeah read a lot about issues with fuse box. Clicked on link you sent but it's saying link is down at moment try again later will try in morning. Thanks again I appreciate your help.

 

I tried easy start no joy. On main relay with ignition off I am getting 12V at 30 & 86. Nothing at 85 & 87. With Ignition on 12v @ 30 & 86. 0.05 v @ 87. With meter on + 12v @ 85

 

Never attempted to start wi easy start

 

On the front of the engine where that big intake hose attaches there is what looks like a throttle valve that you'd find on a petrol engine. On a diesel engine that valve is called an anti shudder valve and it works opposite to the throttle on a petrol engine. It should be fully open when the ignition is switched on, so it would be worth checking that it is.

If that's OK I think what I would do at this point is loosen one of the flanges on the EGR system and slip a bit of card (cereal box) between the two faces of the flange to block the flow of exhaust gas. That's usually a fairly quick/easy step to take and if the engine runs with the card inserted you know your dealing with a leaking EGR valve. If blocking the EGR system doesn't help then I think your either looking at a plugged exhaust or a mechanical/compression issue. I think everything else has been ruled out.

 

Spent another afternoon on motor went to check injector power using a noid light and have no power at any injector. Which I had the other night.

 

Means the injectors aren't firing. That shouldn't prevent it from starting on the easy start though.

 

Back too this Hyundai after not being able too work on it due too work commitments. Still no power too injectors and no power in cable too crankshaft sensor got ground at one side of sensor cable and 2.2v at centre and 2.2v at other side cable.

 

got ground at one side of sensor cable and 2.2v at centre and 2.2v at other side cable.

If your measuring the voltage with the sensor disconnected that sounds OK to me.

If I helped you fix it, why not...

Your support is greatly appreciated​

 

Still no joy with this car anyone help with a wiring Diagram especially for the injectors as there is no power at injectors I have had ECU tested and it is working as it should

 

This is my Brothers car (Although I am sure I am Adopted) and it is doing head in an I have not even laid a finger on it as I stay a good two hours away. This either needs to go or GO.

The title of this post is wrong and should read "Car Cranks but Not Start" at the very least.

The Following has been supposedly done.
Wiring in Relay Box has been checked and new holder put in for Main Relay & Start Relay (Will Come Back To This)
All Fuses & Relays Checked
All Sensors Checked
Crankshaft Position Sensor replaced
All Earth points found so far checked
ECU tested
Initial thought of Fuel sorted out

Now we will go back to Main Relay & Start Relay, here is a wire diagram showing these two and have a few questions that I hope someone can help with.

I have numbered Relay's as to how I think Relay numbers correspond to Wire Diagram, please correct me if I am wrong.
When Ignition is in on position should there be power at 86 Start Relay, there is not but if wire from 87 Main Relay is touched to 86 Start Relay car turns over without key being turned any further. Noid light been attached to injectors at this point and looks like Injectors getting NO fire signal.
I have marked what appears to be a junction with a ? anyone any idea where this is.

As I say I have not laid hands on this car I am just phone support and it is very difficult at times to work out what is happening at other end of phone. I am convinced that this is probably an electric problem somewhere and hope someone out there may have some suggestions or maybe even come across this sort of thing before.

Thanks

 

When Ignition is in on position should there be power at 86 Start Relay

No. There would only be power supplied to the coil of the START relay when the key is being held in the START position.

But you seem to be confused about which relay is which (or your brother is). The relay you've marked as START relay on the diagram is not the start relay. The relay that sends power to the fuel pump would be the FUEL PUMP relay.

The title of this post is wrong and should read "Car Cranks but Not Start"

If the engine cranks there isn't anything wrong with the START relay. It's job is to supply power to the STARTer, which it is obviously doing if the engine is cranking.

If I helped you fix it, why not...

Your support is greatly appreciated​

 

Engine did fire with easy start but does not explain why there is no power getting to injectors

 

Engine did fire with easy start

Oh, OK. I was going on what you had told us earlier in the thread....

I tried easy start no joy.

Did it even attempt to run on easy start?

Never attempted to start wi easy start

.
.

but does not explain why there is no power getting to injectors

There is probably no power to the injectors because the ECU isn't trying to inject any fuel. And the most common cause of that, in my experience, is incorrect fuel pressure. What I would do at this point is connect a voltmeter to the fuel pressure sensor signal wire and monitor the voltage during crank to see if the pressure signal voltage get's high enough for the ECU to start injecting fuel.

With the sensor connected insert a pin down the side of the center wire on the sensor connector. Connect your red voltmeter probe to the pin and the black probe to battery negative, then switch the ignition on and confirm you have 0.5V. If that checks, crank the engine and see how high the voltage rises. It needs to be 1V or greater before the ECU will start injecting fuel.

If I helped you fix it, why not...

Your support is greatly appreciated​

 

There is only 2 wires in fuel pressure sensor

 

No, there are 2 wires on the pressure control solenoid. There are 3 wires on the pressure sensor, usually fitted to the opposite end of the rail from the solenoid...

If I helped you fix it, why not...

Your support is greatly appreciated​

 

Getting 0.38 v with ignition on and 0.72 when cranking

 

That's not right. You should get 0.5V with the ignition on. Back probe the other two terminals and make sure you have 5V on one and less than 0.2 on the other, with the ignition on.

If I helped you fix it, why not...

Your support is greatly appreciated​

 

Got 4.8v on one and 0.1 on other