Question about Volvo 780

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I have a 1988 Volvo 780 and it won't start anymore..occasionally, it used to turn off randomly while driving, but would always start back up afterwards, now I can't get it to turn over. Not sure what exactly is wrong with it.

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  • Volvo Expert
  • 496 Answers

Start with your battery connections and load test your battery. Then run a Fuel Pressure test, you may need to replace the in-tank fuel pump and filters.

Posted on Nov 07, 2014

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6ya6ya
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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: 1988 volvo 740 problems

Here is what I found was the problem with my 1988 740 GLE Wagon.
Remove the phillips screw that holds the cigarette lighter in place. Now remove the ash tray. Next, pull the storage tray and cigarette lighter assembly and lay to the side.
You will see two trays, one with the fuses and one with the relays. The one you want to look at is the relay tray.
On the far left side of the tray and the 2nd relay from the back is the relay that engages the ignition when you turn the key to the start/ Run position.
It is very likely that is simply a bad connection where the relay pprongs plug into the socket in the relay tray.
wiggle and pull up on the relay assembly until it comes out of the tray.
Now just tweek the prongs slightly on the relay so they will make a firmer contact in the socket.
Now put the relay back in the same position it was in originally. Pull it back out and put it back in a couple of times to clean any corrosion oin the contact prongs.
Try to start the car now. This will probably correct the problem.
If not you may have to replace the relay because it may be defective.

Posted on Nov 28, 2008

  • 1 Answer

SOURCE: My 1991 Volvo 240 would shut off while driving,

Ermm...do take your car to a mechanic and check if the fuel pumps are runnin efficiently...lack of and inconsistent fuel supply to the engines may lead to your engine dying as you drive..i'm sure this is observed especially in cold mornings..i had that problem too but now after getting it replaced...its ok

Posted on Jun 10, 2010

Ironfist109
  • 3018 Answers

SOURCE: I have a 1990 Volvo

  • This is classic of your alternator going bad. Sometimes, when it first begins to go bad it will function on and off. Soon it just stops charging the battery all together. The battery has one function and that is to start the car. Then the alternator is ran by the belt and charges the battery and in effect runs the car. The reason for the lights coming on is the power fail in the car.
  • Buying a new battery worked for a short time because the fresh battery ran the car but with no alternator to charge the battery the car soon died again.
  • The fix is to replace the alternator. Do it soon or even that new battery will go bad from being drained so much.

regards, Tony

Posted on May 18, 2011

  • 5370 Answers

SOURCE: Have a 2007 Jeep Commander

Did you got the fuel pressure checked.As you say it sometimes not starting and sometimes starting, this indicates that fuel pump is bit weak, its not letting fuel to the engine.Try spraying starter fluid to the throttle body and then see is it starting with starter fluid.When you face the no start problem like this at that time spray the starter fluid and see if its starting up right.If it starts then its fuel pump and filter issue.The pump is loosing its pressure.-------------But if the same no start problem with starter fluid too, then it can be air filter blocked issue or transmission trans-axle issue or shift bezel issue or it can be low tire pressure issue.----------
Click the link below for more details:---
http://technoanswers.blogspot.com/2011/06/2007-jeep-commander-sometimes-does-not.html ----------- This should help.Thanks.Helpmech.

Posted on Jun 13, 2011

  • 3 Answers

SOURCE: I have a problem with my 2004 impala 3.8 V6 I will drive down the road and it will randomly die and won't start back up. It will turn over and everything but won't start. But if you let it

Possibly a crankshaft position sensor had the same problem with one of my former vehicles. Be careful buying a new one though it is an electronic part and it is not returnable at most part stores. That is what it sounds like to me though.

Posted on Jun 08, 2012

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