1994 850 non turbo: Runs, stalls. Solved -> cam sensor Topic is solved

[erikv11]

I agree, that rules out the MAF.

Don't mean to harass you as replacing the fuel system components is probably good insurance anyway, but that video probably explains how to jumper the fuel pump relay to test it. Or do a search of the forum, the test has been described many times. It's more troubleshooting you can try if you want to.

[scot850]

Also check the cam sensor. When it fails it can cause this. I had a similar problem, first time it was the fuel pump relay (see the by-pass test the guys suggest) and the second time it was due to the routing of the cam sensor wire. It's cable was run too close to the distributor causing the distributor signal to occasionally mask the cam sensor signal. In your case it could be the cam sensor or the wire routing. My car never threw a code when this happened. Would cause bad starting randomly, and stalling while driving.

Neil.

[E Showell]

It is not impossible that your problem is a corroded battery cable. Trace the cable from the battery to the starter. It bolts to the front frame crossmember to provide a ground. I had that cable rusted completely through, but it did not look like the cable was parted at all on cursory visual inspection. The symptoms were much as you describe, although it seemed to start OK. Road vibrations would cause the cable to part and the car to die. I had it towed more than once.

[a061469]

Hello and thanks for all of your help! This really is an outstanding forum on Volvo troubleshooting and repair. I wanted to let everyone know that I finally fixed the problem. Before replaceing the fuel pump and fuel pump controller I wanted to first investigate the only diagnostic codes my volvo was constantly displaying, which were A6 314 and 324, both relating to the CamShaft Position Sensor. So, I searched the forum and found instructions on locating and removing it (of course I found it in the forum). I then began removing the old one to check it out and found a crack in the camshaft position sensor connector located right below the distributor cap, and I remembered scot850 saying he had a problem with his cable being to close to the distributor cap, so the distributor was interfering with the camshaft sensor signal. So, I thought that the crack in the camshaft sensor connector may have damaged one of the wires, or the crack was allowing signal interference from the distributor. I ended up replaceing the camshaft position sensor and bingo, my volvo now runs like new. Thanks again for everyone's help regarding my volvo problem, and for making this an awesome forum to help the average Joe to diagnose and fix their volvo problems. You guys are all awesome!