1992 850 GLT crank no start, no spark

[zero2218]

hi I'm trying to start my car after it suddenly stalled on the road. I have a fuel odor and no spark at the plugs when cranking. Rough idle when it started

Here's a non exhaustive list of everything I've done since:

• Replaced fuel pump relay

• Replaced spark plugs

• Replaced crankshaft sensor

• Swapped ignition coil

• Swapped spark plug wires

Today I checked the distributor cap and rotor. Looks good to me since I'm not an expert ?
I'm a bit desperate so any advice is welcome.

[Vova585]

Is that a crack in distributor rotor at 2 o'clock position? It appears that your car has intermittent loss of spark based on your story . It appears that you were due for maintenance anyway, so for $40 I would put a new rotor. Then I would concentrate on ignition module..one can either replace it for $80 and hope it will work, or find diagram and check all the powers, grounds, controls to it and after they verified call the ignition module bad.

[jreed]

It's hard to tell from the photo of the rotor, but the upper right and lower right bolts appear to be missing.

[zero2218]

It's hard to tell from the photo of the rotor, but the upper right and lower right bolts appear to be missing.

Oh yeah sorry the bolts aren't missing, It's just I took the picture when they were off.

[zero2218]

Visual checked camshaft sensor. Also looks good besides a dirty connector plug

[jreed]

You've checked many of the things that could cause a no-spark. Since the problem is still there, I would check next:
Check for 12V at the coil positive terminal using a voltmeter.
Check the ground straps between engine and chassis, and the battery cables, are clean and sound.
Check the voltage on the camshaft position sensor harness. You may want to try a new/different camshaft position sensor .

[zero2218]

I am currently following the 850 ignition testing guide https://www.volvoclub.org.uk/tech/servi ... esting.pdf

• no spark at the coil when cranking

• coil resistance values are OK for both windings

• my battery voltage is 12V

Connect voltmeter between ignition coil connector terminal
No. 15 (Red wire) and ground. Turn ignition on. If battery voltage is
not present, check voltage supply to ignition coil. If battery voltage
is present, turn ignition off and go to next step.

Voltage is present at this step

Tomorrow I will check the voltage on the camshaft position sensor harness

You may want to try a new/different camshaft position sensor .

I will try to find one and swap it and see if it changes anything

[zero2218]

I am sort of stuck since I do not understand the words Volvo use in their guide.

At step 8, it says:

Check power stage control signal by connecting voltmeter between terminal No. 4 and ground. Operate starter motor. Voltmeter should indicate .7-1.3 volts. If ground, voltage and control signal are okay, repeat test using new power stage.

My multimeter indicates ~1V when cranking. What does "new power stage" mean here ?

[aeg]

Those are generic instructions. The power stage is part of the ignition coil. It's the little box that goes from the 4-pin connector to the 2 wires. On the 240, it was a separate part. I don't think any 850 had a separate power stage.

[jreed]

Agreed with aeg above... the coil and power stage are integrated on the 850.