Hi everyone, I am new to Volvo and this great forum!

My 1992 940 Volvo stalls at stops and sometimes while driving. The rpm drops and the engine cuts off. It takes a few or many trys to crank the engine over and then it will start. But what I do notice is if I pull the spark plug wire out and put it 3/4 in. to the block, the engine cranks everytime in the first try.

Could this be the Hall sensor or something else like the ground loose somewhere?


Thanks for the replies!

 

See if you have a speed sensor on the back of the engine. If not then it would be either the module in the Dist or the power stage,

 

I check the speed sensor (rpm or crank) and it had a tear on the outer black sheathing and was making contact to the engine block's hoisting mount (eye).

I also checked the ignition power stage module and plug which looked good.


I went to the local volvo dealer and bought both sensor and module. I will update the fourm with the results in a couple of days.


Thanks Tech!

 

I replaced both speed sensor and ignition power stage module and drove it for 30 mins with no problem. After I had parked and started it a few times it was fine. After the 10th time doing this, it started then died. I tried to duplicated the start and died routine and I was able to tap the fuel pump relay when it was dying and it started to run again. I guess I will replace the fuel pump relay tomorrow and test drive it again.

 

The relay should also be dated. They usually only last 5 years.

 

Update!

After replacing the fuel pump relay, I had no starting problems. Also I have no engine cut-off while driving after replacing the speed sensor in the last 3 weeks.

Thanks Tech and everyone on the forum!

 

Glad we could help.