88 volvo wont start Gary 760 Inj. v 6

You said change the plugs. This car starts once in a great while but when
it does it runs great smooth as new its has to be the ecu or a short to the
computer but the test light shows power and the ground are clean. there is
no bad spots on the board that i can see ???????????

 

Look here:

http://www.brickboard.com

Look through the RWD faqs and tips.

There are many things to consider in you case, starting with which fuel
injection system you have. The weakest link, coomon to all Bosch
systems, is the fuel injection combined relay. Secondly, if the car sits
a lot, the main fuel pump itself may be sticking and refusing to run.
Sometimes tapping on it while someone cranks the motor will initiate a
start. Beyond that the diagnostics are system specific and since you
haven't stated or determined which system you have post back when you
can relate that information.

Bob

 

It's worth noting that I have never seen an ECU that was bad except two that
got wet.

Mike

 

When you turn the ignition to the "ON" position, can you hear the fuel pump
running? You may need to get a helper to listen with his ear to the gas cap.
If the pump does not run, your first suspect is the fuel pump relay. You
can try reflowing the solder joints, or simply buy a new relay. Otherwise,
the problem probably lies with your ECU. They are famous for failing such
that they no longer (or only intermittently) ground the fuel pump relay and,
obviously, if the relay isn't grounded it isn't supplying power to the pump.