Question about 1991 Volvo 740
Check the air valve, clean the throttle body, adjust the TPS, possibly replace the fuel pressure regulator after a fuel pressure test. Check the MAF: with the engine off, unplug it. Now start the car. Does it run 'better'? If so, the MAF is defective. You can also try cleaning it with MAF cleaner as well. Check the fuel system radio suppression relay (this is located either on the left or right side of the engine bay) is operating - cracked solder joints will also cause this misbehavior. You can easily verify this by swapping it with the AC fan relay next to it, otherwise 20 dollars will net you a new one.
Sometimes problems with the main pump (under the driver seat) check valve will cause this. A failed pre-pump will cause misfiring when cornering, especially right turns. A failed check valve results in low fuel pressure.
Rarely, the ignition crank angle sensor (top of bellhousing, rear of engine) is getting weak or the insulation has failed around the sensor, or possibly the connector is dirty.
Given this condition, also check the grounds on the fuel rail and along the front fenders as well.
Posted on Oct 22, 2013
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Posted on Jan 02, 2017
SOURCE: keeps stalling
I had this exactly the same problem - it would stop and then start again on the first turn of the key.
There is a button and led lights under in the engine bay. Check on the net how to use this to report what errors are showing.
For me it showed the air flow gauge on the top of the air filter. I changed this and the problem has gone 100%.
Posted on Dec 12, 2008
It is a right hand thread and you usually need an impact gun. Take the fan out of the way, to give you more room, I have found that helps.
Posted on Apr 10, 2009
I had the same problem with a 1989 Volvo 740 GLE station wagon. I did the same thing you did. But this time I talked to the local Independent Volvo service shop, not the dealer. The problem turn out to a bad fuel pump in the gas tank. You can replace it from inside the back of the station wagon. Just remove the floor panel to access the top of the fuel tank. But before you do; note that there are two fuel pumps, one inline underneath the car on the drivers side, and the one inside the gas tank. Before, you replace any of the fuel pumps check the fuel pump relay behind the astray on the left side. It could also be a bad relay.
Posted on Apr 26, 2009
My 88 240 has a bad connection where the fuel pump relay plugs in , when the relay gets jostled the car dies. If I jam all the wires back into the plastic fitting it runs fine for a while.
Posted on Jun 23, 2009
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