gq 4.2 tbe starting but not continuing to run???

[menace 2]

How long has your son had the car ?...wouldnt have a hidden security shut off switch somewhere that is activating ?...sorry if that sounds stupid mate...it just seems more like it is electrical if it has spark and fuel , providing they are consistant

[Drewboyaus]

How long has your son had the car ?...wouldnt have a hidden security shut off switch somewhere that is activating ?...sorry if that sounds stupid mate...it just seems more like it is electrical if it has spark and fuel , providing they are consistant

Hey that's a good call......
There's a few discussions about putting kill switches on timers on here as I recall.

[Parksy]

Coolant temp sensor is a good call also. There are two, the one underneath the thermostat housing can wreak havoc on the computer if it's faulty.

Have you checked the crank angle sensor underneath the distributor rotor button to make sure it's not dirty?

[kevingalloway]

Hi Jonesy, If I wait about 4-5 mins it will fire and run for 2 secs then stalls.
The problem started a fair time ago and the son didn't worry about it and just ran it on gas and now we are trying to get it going on petrol.
So the fault was there before we removed the gas brains. I will double check we have all of the gas brains removed.
We have checked the coolant sensor and it seems ok.

thanks KevinG

[Parksy]

You said you had fuel pressure in the rail, when it stalls does it still have fuel pressure? When you first turn the key to ignition, the fuel pump runs and pressurises the fuel rail. It switches off automatically after 5 seconds of running until you turn the key to start, then the computer receives a pulse from the ignition(which is running at this time) which starts the pump again.

Is it possible that the pump isn't switching back on again at start up?

[kevingalloway]

Hi Parsky, We still have fuel pressure when it stalls, the pressure is still good on the gauge. The son checked the crank angle sensor but we may have to double check it again. I will also check coolant temp sensor again.

regards Kevin G

[billyj]

try unplugging the maf, if it runs with the maf unplugged you either have a dud maf or a decent air leak after the maf sensor

[Jonesy_sa]

Hi Kevin,

Thanks for the extra info. Based on that I would check your oxygen sensor wiring and if its not obviously damaged try a replacement sensor. They tend to go downhill at 100k plus. If its buggered it would be sending incorrect readings and inturn the ECU might flood or starve the engine. They can be tested with a multimeter if you know the specs. If your on a budget find out which Nissans share the same same part and head down to your self service salvage.

[kevingalloway]

hi, Billy j, maf is that the same as map sensor?

[kevingalloway]

I can check the oxygen sensor on my patrol and then on my sons.