Volvo penta fires but does not start

[Brucemann]

Volvo penta not starting

Can anyone help tryed to start my volvo penta 5.7 gi
it would fire but not run
any ideas please

 

[Brucemann]

My volvo penta worked fine before the winter
tyred to start it but it does not start it fires now and again but does not run it has had new riser gaskets new fuel and oil filter
any advise would be helpful

 

[JASinIL2006]

Do you mean it would turn over but not catch, or it would catch but then die after a short period of time?

 

[Brucemann]

Hi it will turn over and fire and run for a split second then stop

 

[Bondo]

Ayuh,..... Welcome Aboard,...... Just what is this Volvo ya got,..??

What motor,..??
What drive,..??
What vintage,..??

 

[alldodge]

If you give it some throttle will it stay running?

Also how long has it been doing this?

 

[alldodge]

You got another thread going as well.

 

[Bondo]

You got another thread going as well.

Not anymore,.....

 

[Brucemann]

It is a volvo penta 5.7gi 2003 it has only started to do it after the winter it does not run it trust to but stops

 

[Brucemann]

I turn the key it cranks fine and it will run for a second then stop and it has back fired as well
it is trying to run but it is not

 

[alldodge]

I turn the key it cranks fine and it will run for a second then stop and it has back fired as well
it is trying to run but it is not

Can you give it a little extra throttle (throttle only mode) and be able to keep it running?

 

[Brucemann]

Hi no because it just dies
it wont run only for a second

 

[alldodge]

Need to find out if the fuel pump is loosing power, or something else like the ignition switch is the issue, or something else.

Your motor has at least 2 relays, a main and a fuel pump which has control over the fuel pump.

When you turn the key ON, do you hear the fuel pump run for a couple seconds?
If not, take a volt meter and measure the voltage on the purple wire on the key switch with the key ON

 

[Brucemann]

Hi the fuel pump runs when the key is turned it runs for about four or five seconds

 

[alldodge]

Need to find out if the fuel pump is not running when the motor is cranked over. There is a fitting used to check pressure at the TBI.



This is attached inline at the TBI and a gauge can measure fuel pressure.

Can also put a meter on the fuel pump wires and see if the pump come back ON

Also look close at the motor to see if a wire has been removed from a sensor. Replacing the risers could have knocked something off

 

[Brucemann]

Hi many thanks I will get on and try and let you know
I will also check all sensors ECT

 

[Brucemann]

Fuel pump is good and all sensor cables are attached
sparks on all 8
Unsure what else it could be
any ideas would be good

 

[alldodge]

sparks on all 8

With spark only thing that keeps it from running is the fuel pump. Might not be turning back on. Either that spark starts and then turns back off. Since it backfires sometimes I would think the fuel pump is turning off

Find the fuel pump relay and swap it with the main relay. They should be the same kind and sitting side by side

Need the motor scanned for codes

 

[Bondo]

Fuel pump is good and all sensor cables are attached
sparks on all 8
Unsure what else it could be
any ideas would be good

Ayuh,..... Welcome Aboard,...... At this point, ya gotta Verify the the fuel pump continues to have Power, after ya left off the key to the run position,.....

It's powered from 2 directions, 1 durin' the Start circuit, the 2nd by the ignition circuit,....
It's workin' durin' the 1st, but not by the 2nd,.....

AD is steerin' ya Right,..... Test at the relays,....

 

[Brucemann]

Many thanks I will try
and let you know how I get on