I have a 850 wagon non turbo, it does not have spark or fuel. I have replaced the ignition coil and the cam sensor. Every once in a while it will start and run fine once after I disconnected the battery. Also just before these problems started the car was ran very low on oil. I'm at a loss any help would be appreciated.

 

MAF sensor and/or Oxygen sensor.
You can try to start the car with MAF sensor cable unplugged but I have no experience to test the oxygen sensor. All I can make out is that when you disconnect the battery and then reconnect it to start the car, the computer forgets all the optimised settings and start the learning procedure from there.
Also wait for experts to chime in their opinion.

 

I tried bypassing the fuel relay the fuel pump is kicking on, I do not know the pressure at the rack i need to find a pressure gauge. I disconnected the maf sensor no change. I checked the connections at the speed sensor they look good but it still could be bad, I do not know of a way to test it.
thanks for the help.

 

For no spark, check voltage to the coil first, then after the coil. If you are not getting power to the coil, start checking wiring/fuses

 

I have tested the fuses and there is no power from the coil but there is power to the coil. The coil is new. What confuses me is the injectors are not firing also.

 

I did some research and found the parts store gave me a crank sensor not a cam beyond them making me feel like a *** they also owe me around 70 bucks.
I also have checked the connections on the main fuel relay on the fan shroud they look good. I also tried to test the speed sensor while the car was cranking, I know it will shoot ac voltage when the car is running but not sure when car is just cranking.
I checked the fuel pressure at the rail it was 45 psi, but the injectors are still not firing.

 

If you have fuel at the rail but the injectors are not firing it definitely sounds like you are not getting voltage to them. Have you tried checking to see if the ECU itself is seated properly in its housing? It is a long shot but simple enought to be worth a try

 

There up front passenger side I have had them out and checked the contacts, made sure they were seated good.
Thanks for the idea..

 

Well now I have replaced the cam sensor and still the same result, it cranks but no spark and fuel injectors not firing. It did start once and ran but as soon as I shut it off would not start back up. One thing that might be of interest when it started the speed sensor was not connected and when it would not start I remembered it was still disconected, when I hooked it up it made no difference.

 

Look on the top of the radiator and see if you have a relay there with 4 wires. If you do check the wires at the plug and make sure they didn't back out of the plug.

 

Would the car start at all if there was a problem with this relay? Would a bad speed sensor cause this issue. When it runs it runs normal no stalling no anything. The problem is when you try to restart it.

 

The relay can cause both. Also the speed sensor can.

 

Have you pulled fault codes from the ECU?

I'd like to know the model year as well as the type of engine (turbo or NA).

See attached, but most of the items have already been suggested by other members & moderators.


JPN

 

I checked that relay looks good I also put dielectric grease on it.
I made a new post and summed up what I have done to the car.850 no spark fuel injectors not firing