Just read your codes for free. Its a volvo.!
Your 740 has its own onboard diagnostics code reader, its right there
under your hood.
Look on the driver side, right next to the hood hinge.
You'll find a small black plastic box.
Just pull the lid off, theres a probe which you pull out and insert
into the various holes, on mine its #2 and #6, they are numbered.
#2 is for ignition, #6 for fuel injection (I think).
Get some paper and pen and be ready to write the codes down as they
flash.
Press the button for a second, release, and count the flashing LED,
it flashes in series of 3's, for example ;
three flashes -pause- two flashes -pause- one flash,
written 3-2-1 is the code for a cold start injector (or its associated
wiring.)
Do it again and write down the next series of codes, one more time for
the 3 stored codes in its memory.
Now look the codes up .....,
http://brickboard.com/FAQ/700-900/EngineOBDCodes.htm#LH24FuelInjectionFault
make sure you know which ignition system you have, if its got the
regular cylinder shaped ignition coil you have the bosch system, mine
is rex regina with a strange looking square coil.
They have different codes, but its all there for you to look up, then
you have a good idea where the fault is coming from.
Just read and follow the directions,...... ignition ON, engine NOT
running. Simple.!
