Cranks wont start

Also, I know it is not the chip in the key. I tried a non chipped key and it wont even turn over then.

Have you checked for spark yet?

Yes and it is hit and miss. When there is spark it starts right up. I have the ECM at a re-builder now having it checked.

Does your code reader show live data like engine rpm?

Yes and it does not show any rpm's while cranking. Which is why I decided to have computer checked after replacing the crankshaft sensor.

Alright let me know when you get the computer back and what they said about the computer.

Will do.

Please let us know so it will help others

Computer was tested and the processor was bad. But since it is isuzu they can't rebuild it. I got another one online but I have not gotten the chip in the key programmed so I still can't start the car

Getting really frustrated

Okay lets start over from the top here is a guide that will help you.


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


Let us know what you find

Are you sure the key has a chip?

Yes. It is chipped. Unfortunately

Some lock Smith's have the key programmers you should call around.

Have to wait till Friday and will be doing that.

Let us know how you make out.

ok new computer is back and programmed to the keys and checked out good. but still no spark at the plugs

Do you have a code reader that can read live data?So we can see if there is a rpm signal while cranking the engine?

no mine won't read rpms

Do you have any current codes ?

no. there are no codes in the computer. i have checked all fuses everything. new cam sensors new crank sensor new computer.

Does the engine have compression?

here are some guides that will help you

https://www.2carpros.com/articles/how-to-test-engine-compression

and

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

Let us know what you find so it will help others

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

It looks like its time to do a pin to pin check of the wring harness, must be a shorted/broken wiring somewhere plus you can check the power and grounds, here is a guide that will help you

https://www.2carpros.com/articles/how-to-check-wiring

Please let us know what you find so it will help others.

Best, Ken

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.

This sounds like a fuel pump or the crankshaft angle sensor has gone out. When you turn the key to the on position without cranking the engine over can you hear the fuel pump run in the tank for 5 seconds?

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

Please run down this guide and report back.

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.

you will need to start a new question for the Holden, if you have power to the pump but no pressure you will need to change the pump out here are the instructions. Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.

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.