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I talked to "THE man" about this problem (I have same problem with mine). The one thing our volvos have in common is sitting for a long time. When gas sits for four years, seven for me, The gas turns to glue. "THE man" said he has seen this problem several times. He gave me a few tests and things to check. He said most of the time you have to replace EVERYTHING in your fuel system. I will list most common failures: Fuel Strainer, Fuel Pumps, Accumulator, Fuel Filter, Fuel Distributer & frequency valve, Fuel injectors, Fuel pressure regulator. We are both half way there. That leaves Distributer, injectors and fuel pres reg.
Now for what to do:
Remove spark plugs
Remove fuel pump fuses
Ground coil wire (make sure it is no where near soon to be exposed gas)
Crank engine to remove excess gas from cylinders
Remove injectors from head (do not disconnect fuel lines)
Reconnect fuel pump fuse
turn key on (run fuel pump, you may need to jumper the fuel pump relay)
check to see if gas pours out of any injectors
If gas pours you have bad distr. or inject.
next remove air bellow (on top of fuel distr.)
get a magnetic something or nother
turn fuel pump on (with jumper or ignition)
the plate under the bellows on the distributer shuts off the fuel.
touch magnet to the plate GENTLY!! and pull the plate up
the plate should move easily
Also when plate comes up it should switch fuel on/off
sorry I can't remember if he said up turns it on or off.
look at your injectors to see if it switches
If distrib is working properly and plate moves easily check to see if any injectors are leaking (when plate switches gas off)
Now that I think back he may have said up is on.
When you pull plate up you should get fine mist out of inj.
Looking back at how the volvo runs then doesn't it sounds like the fuel distr.
That plate may be sticking or bad.
You cannot rebuild fuel distributer. You must replace if bad. If you open it up you destroy it.
I hope this book helps. I cannot try any off this until later on in the week.
p.s. How much did you pay for your Volvo. It looks like that great deal we got on our cars may end up costing us a "great deal" of money. I payed $250 for mine. I have spent a total of $760 including purchase. I hope it is a good investment. It only has 105k miles with a perfect body. It does need paint though.
Good luck
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