95 850 turbo (non-R) crank no run

[echosierra]

Fuel pressure needs to be right. Get that gauge sealed otherwise your measurement is meaningless. The fuel is metered by time , assuming a correct fuel pressure , so if this is 20% off the car won’t run

A 3 second blast of ether willl probably make it go vroom and can help confirm a fuel delivery problem

Good advice, will do

[echosierra]

....125 is pretty low for compression if it isn't just the gauge, you expect 150-180. Lawn mower syndrome also possible at 125.

Wait, compression ratio on the turbo engines is 8.5:1, which puts in the 125 neighborhood right?

[echosierra]

Ok, fuel pressure = 46 psi with no leaks on the gauge

[erikv11]

....125 is pretty low for compression if it isn't just the gauge, you expect 150-180. Lawn mower syndrome also possible at 125.

Wait, compression ratio on the turbo engines is 8.5:1, which puts in the 125 neighborhood right?

Volvo actually puts the bottom of the range for this engine at about 155 and that's consistent with what people report, e.g. https://blog.fcpeuro.com/how-to-do-a-co ... linder-vol or https://volvoforums.com/forum/volvo-850 ... rbo-33048/ etc.

[echosierra]

Please kids, buy quality tools, esp diagnostic tools. And listen to the experts here

After getting my hands on a good compression tester, my compression readings are:
1: 170
2: 170
3: 172
4; 172
5: 172
Measured cold and dry

[erikv11]

Nice numbers! Well if you've tried swapping the crank and coil I've got nothing else. Immobilizer would be no spark.

[echosierra]

Nice numbers! Well if you've tried swapping the crank and coil I've got nothing else. Immobilizer would be no spark.

Crank sensor will be today, ill post results

[abscate]

Lets await the pending ether test, with bated breath (not baited breath - that's from fishing)

That will tell is if we are on the spark tree or the (fuel/spark) tree of Diagnostics

[echosierra]

Starting fluid test was easier than crank pos swap from the parts car, so that was first.

So staring fluid DID yield a ‘vroom’ for 2-3 seconds!

So this probably means that ive got a fuel problem? Right?

Pressure tested a couple days ago = 46 psi at the rail valve

I had the injectors sent off to be rebuilt when i first got the car a few weeks ago, maybe something went wrong there? But all 5 are bad? ...unlikely. Perhaps my injectors arent getting electricity/signal to fire?

What next?

[abscate]

You’ve got decent spark, yes.

Check for 12 volts at the injectors , you need a wiring diagram to get the right terminal

The injectors get a common 12 volts from the battery, and are fired by grounding through the ECU

If the 12 volts at the injectors is good and thefuel pressure is good, you have to inspect the wiring from injectors to ECU. They batch fire, all at once, I believe, in your software