Recently I did a headgasket repair on my 2006 S40 2.4i, and it won't start.

It turns over with no ignition, It has fuel pressure and appears to just not be firing. I'm starting to think it might be the cam position sensor, or the black piece that is right under it on the end of the cam shaft (Had to get rough to get the stripped screw out) . I haven't been able to confirm. I did end up getting 4/1000 'inch (100 micrometers) taken off the head when I had it resurfaced.

Can you guys think of any troubleshooting I might need to do to determine something with any certainty? I'm not a mechanic, so very open to suggestions and corrections.


I connected a OBDII reader to the car and that info is below. This is just live data as I was unable to pull any error codes with this reader.

Fuel sys 1: NA
Fuel sys 2: NA
Calc Load(%): 0.0
ECT(F): 66
Fuel Pressure(psi): 29.2 44
MAP(inHg): 29.2
Spark Adv(degrees): -1.5
O2S B1 S1(mA): 0.00
CAT Te 11 (F): 66
ECU Volts(V): 11.660
LOAD Value(%): 0.0
Rel TPS(%): 21.6
TPS B(%) 39.2
TPS C(%): 0.0
Command TAC(%): 21.6

 

I replaced the ignition rotor that sits on the end of the camshaft with no changes. Can't seem to find anything unplugged and the car would run before the head gasket replacement. The vacuum pump is making some noise, but as far as I know it should have no effect on the vehicle starting.

 

Fuel pressure (at least on my 2005 V50) should be up around 50psi.

I'd recommend doing a compression test - that'll tell you if there's a problem with the cam timing, at least.

 

Thanks, fuel pressure is around 44 PSI. I might have let some out while checking and forgot to let it get back up there before taking the reading. I'll give it a compression test. I sync'd the cams with a timing tool and turned the crank pulley with the arrow facing up. They also tested the valves and said they all tested good. I'll double check that the crank drive pulley was supposed to be facing straight up at the mark on the body. I suppose there is a chance I could have mis read or read info for the wrong vehicle.

 

 

I just tried to find a photo but really didn't come up with anything definitive. It looks like there may be very tiny indents on the faces of the two crank pulley teeth that are centered on the timing mark when the engine is at TDC (and the cams are lined up with their respective marks, of course). Most cars have the markings on the crank PULLEY rather than a gear that drives the timing belt, making it a LOT easier to determine proper crank timing, IMHO.

 

 

Other references seem to indicate some sort of notch in the valley between the two crank gear teeth that lines up with a single "arrow" on the engine block. But I couldn't find a photo that was definitively from the right engine (searched S40, V50, C30).