Cranks wont start

No. There are no codes in the computer. I have checked all fuses everything. New cam sensors new crank sensor new computer.

Ok compression is good. And I am getting about 280 to 300 rpm while engine is turning over. But I am still getting no spark from any of the coils

Hello everyone, I realise this is an oldish post. But, I have a 2004 3.5liter V6 petrol 5 speed rodeo. I have been having an issue where the engine will crank but not start. The problem was intermittent at first but became progressively worse until the engine would not starter all. I have now worked out that the problem is either the fuel pump or the fuel pump relay. I swapped the fuel pump relay with the horn relay and the engine started. Just have to see if the problem occurs again now to test the pump. And yes the horn still works. Hope this helps.

Hi Ken,

No can’t hear the pump. It did the same thing yesterday so I shorted out the two large terminals for the relay and there was no difference. Also when cranking there is no fuel pressure at the valve on the left side fuel rail. I will be pulling the old pump out tomorrow and replacing with new one.

On another note, can anyone explain why I get very bad fuel economy from this engine? Roughly 6km per 1 liter. 2004 Holden Rodeo with 3.5 liter V6 petrol with 5 speed manual box.

Thanks Ken. I have replaced the fuel pump and the engine starts with no problem at all. By the way, I didn't take the tank out, I just undid a couple of the nuts and bolts holding the tray on and then jacked up the tray which gave me ample room to remove and replace the pump assembly.