Hi 300 lovers,this is my prob.

Ive just put a replacement engine into my car,and it wont start.The symptoms are as follows.

1.I have no spark

2. have no fuel getting threw

But wot is happing is,when the ignition is turnd on fuel is pumped up to fuel filter,which says fuel pump is working,im told this is my primery which indecats that the ECU is working,i have power going threw to the ingectors,but once engine is turned over i have no spark and no fuel,ive been told this could be cause of my crank sensor,is this correct or is there something els you think it might be that could cause these symptons.If it is crank sensor were is this located, my car is a 1991 n/a auto, i would be most greatfull for any help,car has now been off the road for a week and a half and i want it back.

Edited December 9, 200817 yr by huggy bear

Hi 300 lovers,this is my prob.

Ive just put a replacement engine into my car,and it wont start.The symptoms are as follows.

1.I have no spark

2. have no fuel getting threw

But wot is happing is,when the ignition is turnd on fuel is pumped up to fuel filter,which says fuel pump is working,im told this is my primery which indecats that the ECU is working,i have power going threw to the ingectors,but once engine is turned over i have no spark and no fuel,ive been told this could be cause of my crank sensor,is this correct or is there something els you think it might be that could cause these symptons.If it is crank sensor were is this located, my car is a 1991 n/a auto, i would be most greatfull for any help,car has now been off the road for a week and a half and i want it back.

Right you need to understand a couple of point so you do not waste time looking for non existing issues.

 

The injectors have a permanent 12v supply even with the ignition off, the ecu triggers the injectors on the earth side.

 

The initial fuel pump run is pressure prime, if there is sufficent pressure in the rail it will not run, however oddly this is not always the case.

 

The injectors and fuel pump looks for a signal from the cas unit to as does the coil pack supply but only after the engine starts to crank, hence a crank signal.

 

If a problem occurs in the ignition system it will not effect the fuel so as you are having issues with both it does look like a cas unit or cas unit connection problem.

 

The easiest way to eliminate the cas is to remove it from the engine ( 3 x 10 mm bolts) and whilst it is still connected electrically and the ignition switched on, rotate the cas unit shaft, this should trigger the crank signal the fuel pump will run as you rotate it and also the injectors should click.

 

By also removeing a coil pack fitting a spark plug into the end and laying it on the top of the engine ( connect) you will also see a spark as the cas is rotated.

 

If there is fuel and no spark then the issue is with the ignition/ ptu if there is neither fuel or spark then it is the cas unit or connection.

 

Hope that helps

 

Jeff TT

Following on from Jeffs reply. Looking at the engine, on your right hand side and at teh front of the engine, is an alloy almost round shaped block, with 1 electrical connector on it and 3 bolts, undo the bolts and do as Jeff suggested. Before removing the bolts though, just draw a pen mark around their head where they pass through a slot, this will hellp ensure the CAS goes back in the same position as it was before you removed it.

If you do not hear the injectors click, it's knackered, if you still have your old engine with CAS attached to it, just put that one in.

smithy

Don't forget to mark the position of the CAS before you remove it.

 

Vijay