Car only runs for 5secs then cuts out

[Youngy]

As above yesterday my car was running really nice with no issues but today I went to get it out the garden and it would only run for 5 seconds then cut out but it would start straight away but cut out again, but now I went to get it back into the garden and it wouldn't start at all so what are people's opinions coz it's got me puzzled 

thanks in advance 

[Scoobyghost]

Any cel?

[GeoffLeggy]

First thing Id check off is that I had juice in it! Sounds silly but......

Then if you can hear the fuel pump priming?

See what cel result is as above.

[Youngy]

I made sure there was fuel in there first,I put £7 in it and no the cel light isn't on and I can hear the pump when I first turn the key but I'm 95% sure it's fuel starvation 

[GeoffLeggy]

Would be my first thought. 

Check no connections have come loose eg maf 

Suppose youd get light though?

[Phillip1993]

Not if the light has poped

[kayzarh]

Hold up I'll post the good **** in 2 minutes

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[kayzarh]

Id say check your crank cam sensors and then check for spark.

both the cam and crank sensors, no need to remove anything, just use some agility and test it with a multimeter in ohms mode.

Camshaft sensor is here;

Crank sensor is here ;

Camshaft real life:

Crank sensor real life:

[Mr B]

^ Sounds likely

pump will initial prime with ignition on but will only power when engine cranking & reading the sensors for this, if sensors test ok check wiring connector harness .

Review immobilizer circuit too as many (pending how wired in) cut pump trigger but not the prime trigger & had a few cars over years with sticky/failed relays in immobilizer modules .

[kayzarh]

Keep us filled in and we'll get to to bottom of it in no time

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[kayzarh]

1 hour ago, Mr B said:

^ Sounds likely

pump will initial prime with ignition on but will only power when engine cranking & reading the sensors for this, if sensors test ok check wiring connector harness .

Review immobilizer circuit too as many (pending how wired in) cut pump trigger but not the prime trigger & had a few cars over years with sticky/failed relays in immobilizer modules .

@Youngyill get the techniques posted for you as soon as you check the sensors are okay

[Youngy]

Thanks for all that I will be checking them in a bit and I will post back soon 

[Youngy]

Right I checked both sensors and they are fine I also took the fuel pipes off the filter to make sure the pump is pumping and it is and I don't think it's the maf because it would start even if it was knackered because Iv left it off before, when turning it over it does want to start but it just don't so I haven't a clue what it could be 

[Beags]

Sounds like immobilizer as it tries to start but won't.

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[Youngy]

How do I check that one then 

[kayzarh]

Do you have Aftermarket or stock immobiliser? Have you done a spark test?

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[Scoobyghost]

How did it run when it was running for those few seconds?

[savage bulldogs]

When you start it then it stalls, will it start up straight away if you prime the pump again by turning the key back to 0 and turn the key to start it again ?

Have you checked the vac line to the fuel pressure regulator ?

As it might just be starting on the initial pump prime and surge in pressure.

If the fpr is ok it does sound like something is cutting the "constant " power to the pump that it should have when running .

[Youngy]

It has a stock alarm on it and it ran perfect just for those seconds but I haven't checked the  vac line but it isn't staring at all anymore but I did take the fuel line off at the filter then turned the car over and it filled a bottle up within seconds so I don't think it's fuel related anymore 

[Youngy]

And it did start up straight away after cutting out but it did have to go to 0 position 

[savage bulldogs]

Have you got any codes on the ecu ?

checked all relays and fuses both under the bonnet and under the drivers side kick panel .

If you've been running it low on fuel did you take the fuel line off after the fuel filter or before (could the filter be blocked)

[kayzarh]

ill do a little brainwaving tomorrow and try to post some ideas.

[Youngy]

Iv checked all fuses and relays under bonnet but nowhere else and I took the fuel lines off both sides just incase but Iv been reading and I'm sure it's a immobiliser problem 

[kayzarh]

I'm sure someone here can help you do an immobiliser bypass but are you 100% sure it is that?

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[savage bulldogs]

Did you check the fuse box behind the plastic trim next to the accelerator peddle?