Ok so I've been trouble shooting starting issues with my 2001 XC70 and recently got it back from a Volvo technician who was suspecting issues with the flywheel due to the fact that when the car is cranking the engine speed jumps all over the place as it tries to find TDC (then fails to do so lol ...

So frustrating update here... The car has been at one of the most reputable Volvo shops in the Seattle area the last week and they did discover a few more issues. After doing a smoke test they found a vacuum leak in one of the air intake pipes and replaced that. They also replaced the crankshaft ...

what's your pressure read on the schrader valve at the end of the fuel rail?
and what kind of gas do you use. brand and grade.


Tested it last night and got 56 psi.


good range as vtl said, i usually get between 51-58psi
if you have a somewhat recent laptop (i use a 2018 thinkpad t490 with ...

CPS (crankshaft position sensor) wires go too close to starter, their take interference up from it. ECM can't see crankshaft position and denies ignition. Cutting CPS wires and routing new ones away from the starter helps with that syndrome.


So I re-routed those wires and no improvement. If ...

lrock wrote: 18 Nov 2024, 13:51 what's your pressure read on the schrader valve at the end of the fuel rail?
and what kind of gas do you use. brand and grade.

Tested it last night and got 56 psi.

what's your pressure read on the schrader valve at the end of the fuel rail?
and what kind of gas do you use. brand and grade.


Premium gas usually from Shell or Chevron. New fuel pressure gauge on the way. Mine didn't have a schrader attachment that fit.


I usually just grab a pencil ...

what Irock says.
confirm fuel pressure at the rail now you have a new pump. buy your own gauge for $22.

https://www.amazon.com/BETOOLL-Fuel-Pressure-Test-Kit/dp/B0B9R5HF4D/ref=sr_1_5?crid=10KWXKAV7MG7O&dib=eyJ2IjoiMSJ9.8kGQVnhAqhZUuUwurByzaxe60K0vHKbC4EEB2vV4-7xdItfNsBYC4ho6P6Yddt03Q14B5lQ76s6vj ...

CPS (crankshaft position sensor) wires go too close to starter, their take interference up from it. ECM can't see crankshaft position and denies ignition. Cutting CPS wires and routing new ones away from the starter helps with that syndrome.


Oh good point! I didn't think of this but have run ...

I am in a similar boat though with a NA engine. However I am arming myself with a pickup probe and will see exactly what my ignition waveform is like, and then maybe correlate that with crank and or cam on my oscilloscope.

Since you mention you had a cam code, could it be you have bad timing? I ...

lrock wrote: 18 Nov 2024, 13:51 what's your pressure read on the schrader valve at the end of the fuel rail?
and what kind of gas do you use. brand and grade.

Premium gas usually from Shell or Chevron. New fuel pressure gauge on the way. Mine didn't have a schrader attachment that fit.