1995 850 T5 No start, possible fuel issue??

Post by **misha** » 14 Mar 2014, 16:07

cudatime71 wrote:I read all the fuse descriptions and none of them mention an immobiliser.

There MUST be a few fuses for immobiliser

cudatime71 wrote:...Since I purchased the car, after starting it, I would have to move the key back a smidge in the ignition to get the lights to come on. I figured it was an ignition switch and would get to it eventually. Could the ignition switch be bad and causing this problem?

Yes it can.I didn't know that you allready had an issue with ignition lock,but it would be your primary suspect.

In order to go forward,you must solve the ignition lock first.

cudatime71 · Post by **cudatime71** » 14 Mar 2014, 16:42

Alright, I'm going to do some more research to find out which fuses are for the immobiliser.
I didn't think about the ignition because I was sure it was a fuel issue. I'm going to order an ignition switch right now. Is that the same as the ignition lock?
I will update you once it's in.
Thanks

Post by **rspi** » 14 Mar 2014, 16:45

If you have NO spark, and NO fuel pressure (pump not working), chances are that you have a bad cam sensor.

Post by **rspi** » 14 Mar 2014, 16:54

Have you replaced the cam sensor ?

Post by **rspi** » 14 Mar 2014, 16:56

Also, if you have an alarm, you don't need a remote to arm it. When you lock the door with the key it will arm. You can test that by simply rolling down a window, lock the door, wait 2 minutes, pull up a lock and open a door.

Post by **rspi** » 14 Mar 2014, 16:57

I'm pretty sure the immobilizer will STOP the car from cranking.

Post by **misha** » 14 Mar 2014, 16:59

rspi wrote:If you have NO spark, and NO fuel pressure (pump not working), chances are that you have a bad cam sensor.

Bad cam sensor will not prevent a fuel pump from running.

But he also DON'T have all the little lights on the dash when key is in ignition II and since he bought the car he had problems with ignition lock.

Also...if ignition lock is faulty EVERYTHING in the car will be dead.

Post by **misha** » 14 Mar 2014, 17:00

rspi wrote:I'm pretty sure the immobilizer will STOP the car from cranking.

Mine will crank but it will not start.

Post by **northernlights** » 14 Mar 2014, 17:46

On my 94 Turbo when the immobilizer is activated the car does not crank. This seems to happen when someone locks the passengers door when the car is off. I have to unlock the drivers door with a key to bring it back to life.

The service manuals state the car will not run without a functioning crank sensor. The same book states it will not start without a functioning cam sensor, but nothing about running.

This is very different from domestic models that I have worked on that will keep running - often very poorly - even without a bunch of sensors. I think Volvo had a different philosophy in that they tried to protect the drivetrain/emission control hardware (especially the cat) by not allowing the car to run when a sensor they considered critical was acting up.

The ECU checks to make sure the engine is turning (among other things) before it turns on the fuel, which I suspect is a reason that the fuel pump is often misdiagnosed as being dead when it is actually the ECU not powering it.

My car would occasionally miss under load during normal driving. I replaced the cam sensor, crank sensor and fuel pump relay at the same time as preventative maintenance and the problem went away. This was about 20k miles ago, so I do not believe it was a fluke.

Based on the date codes on my cam sensor and fuel pump relay I believe they were 18 year old originals when I replaced them two years ago. I believe I purchased the replacements from Pelican Parts as they often have the best prices on OEM parts. I do not trust the questionable knockoffs for mission critical sensors.