Hi,

I've been reading lots that I've found here over the past month and learning so much, but, boy oh boy! I'm at the point of being completely overwhelmed! (I should say that I'm a single mother with absolutely no mechanical knowledge as of a month ago...but I'm a quick study!!)

Anyway, over a month ago, my car just died as I was driving and wouldn't start again. No fuel pressure to the rail. The engine wouldn't turn over again, so I towed it home. (That was the first lesson - how to tow a car!)

So, at this point, my car ('85 760 Turbo) has new fuel pumps as well as a new relay. I can now hear the pump when the key is turned and the gas pressure is good. There is about 3/8ths of a tank of gas. Battery is low now, but I'm trickle-charging it (I can't get a boost due to where I managed to park it - although I suppose I could if that was the solution).

Fuse 11 (um...fuel intake fuse) doesn't seem to show any current, but the fuse was replaced and still no show...

Hmm...what else can I tell you? Again, I hope what I said was at least somewhat clear; I'm just learning! (Oh, and I live on an island, that's the reason I didn't just call my Volvo guy!!)

Thanks,
Esme

Before you dig too deeply into the Fuel system, you need to see whether the Ignition is producing spark at the plugs.

I know 240s better than the 700 series, but ALL Bosch FI systems will not deliver any Fuel if it can't be ignited. The FI ECU MUST see timing pulses from the Ignition before it will "wake up".

This is a built in safety feature — not to pump fuel to a dead engine, as in the case of an accident.
--
Bruce Young
'93 940-NA (current), 240s (one V8), 140s, 122s, since '63.

Okay...back again...

So, in fact, there is no spark. (And that's as far as I can go today, as I'm sick - with a cold AND sick of my car!)

Esme

Sorry you're sick
Get Volvo manuals here:

https://blarf.homeip.net/greenbook/gallery/bymodel/760

Bill

I have a 90 740 .All I could find was a 740/760 manual unil 88&I don't need it&I'll send you that one if you want.just tell me where to send it.
this should n't be to difficult.

I do have a Heynes manual. I don't know which brand makes the best manuals, but it seems to be doing the job. Thanks for the offer though! (:

Esme

No spark , check for 12v at the coil + terminal with ignition on, and again while cranking. If voltage present, test the coil primary and secondary resistance, if out of spec replace coil, if no voltage to coil, power stage is likely toast ( hint, coil and power stage usually give out within a close time of each other )
--
-------Robert, '93 940t, '90 240 wagon, '84 240 diesel (she's sick) , '80 245 diesel, '86 740 GLE turbo diesel, '92 Ford F350 diesel dually

Checked the coil today, and it's fine...
Esme

I 'd add that testing the coil – (negative) terminal with a +12V test light can also be helpful,

With the key on, a test light at the negative terminal should be bright (+12V "reading" thru from the + terminal).

If no light, either the coii is bad, OR there is no voltage at the + terminal. (further testing needed)

If the light is bright, it should go dim and pulsing when the engine is cranked. Failure to change from "bright" means the Ignition Control Unit (ICU) is not triggering the coil. (further testing needed)

NOTE: Looking at the Haynes diagrams (reluctantly), it seems that the '85 740 Ignition doesn't have a "Power Stage" as suggested above. The ICU triggers the coil directly, based on timing pulses from the distributor.
--
Bruce Young
'93 940-NA (current), 240s (one V8), 140s, 122s, since '63.

Bruce,
My 85 does have a power stage on the drivers side fender. I'll have to look at my Haynes and see if its in error.
--
Post Back. That's whats makes this forum work.

... I jumped straight to the diagrams and saw the dotted-line "generic" 6-wire black box ICU.

After your post I went back to look at Chapter 4, which does show several flavors of EZK (with power stage), but I couldn't find any info on what years used what system, making me grumpier than usual.
--
Bruce Young
'93 940-NA (current), 240s (one V8), 140s, 122s, since '63.

Hi Esme,

I have the Volvo wiring for the 89 740 here, maybe It's similar
enough to help you.
Fuse 11 is for the Tank Fuel pump Fuel pump.
The main fuel pump under the driver is fed by the Fuel Injection relay
which in the 740 is in the fuseblock/relay unit under the radio
it is just in front of the red cylindrical bulb out sensor.
This relay is famous for failing. If you have no voltage at Fuse 11
then the "FI" relay is the nr 1 culprit. Try smacking it with the handle of a screwdriver. I dont know if you can pop the cover and attempt a repair...either resolder bad connections or file the points.

Also check the Radio Interference relay Which in the 740 is in the engine
compartment by the right post.

Both of these relays have to be right to get fuel.

If you intend to service your car, start collecting service info.
There's a lot of it on Brickboard and elsewhere on the web.

What island?

Good luck, Bill

I agree with the "checking spark" the 85 has no radio suppression relay. It could be the "hall sensor" in the distributor. If original, start at the plug looking for spark, and work backwards. No spark at plug, see if spark out of coil, if so, hall sensor.
--
Post Back. That's whats makes this forum work.

You have a year (up to '87) that's prone to engine wireing harness insulation deterioration. That can be an issue. But check to see if the injectors are getting voltage. Unplug them all and turn the ignition on. You should have 12 volts to ground at one pin and zero on the other. No voltage and the injector relay or connection or wireing is probably bad. Check if your tach needle jumps a little when trying to start. If not the hall affect distributor sensor could be bad or the power stage.

Hi,

Thanks for all of the responses. I did spend ages (a few weeks back) looking for my radio suppresion relay and did discover that I don't have one (!!!). But, otherwise, I'll take all of the info under advisement and see what I can make of it. I really am learning as I go, so I really have to research everything that I've read! I'll keep you all posted, and if anything else comes to mind, bring it on!! (Oh, the pain!!)

Thanks SO much!
Esme