B230FD Cranks but won’t start

[Volvo940GL]

Originally Posted by Laird Scooby

If the spark plugs are wet with fuel, you need to remove and dry them. While they're out, check the gap, it should be 0.65-0.7mm or 0.025-0.028" - don't confuse Imperial feeler gauges with metric! I've seen someone do that before and instead of having a plug gap of 0.7mm, because they used Imperial feelrs set to 0.070", they had set the gap to 1.75mm and no wonder their engine didn't start!

If your distributor is mounted on the rear of the cylinder head, as far as i've always been aware you can not alter the timing, this is done my the LH-Jetronic (or later) ECU. What year is the car?

Haven’t measured my plugs. But I have original Volvo plugs but not for non turbo engine.

[Laird Scooby]

Wouldn't have thought the EGR could cause a non-start problem but there's always a first time.

If you can locate where the EGR hose goes onto the inlet manifold and blank that off, it may start then but i suspect it's a fault showing up more because the engine won't start than anything else.

Try pulling fuse #1 for 30 seconds or so, refit and try starting again - if it starts, keep it going until it warms up, if not, try reading the codes again.

Might sounds like a pointless exercise, but if the same code comes up then it's worth investigating further.

If a different or no code comes up, that's a different matter.

Do you have a NOID light?

[37 RUBY]

Originally Posted by Volvo940GL

When I crank the engine it sounds like it’s ignites. It’s sort of a strange blow sound and disappear.

From your verbal description, that sounds like an engine trying to start but fails to do so due to issues with ignition & fuel timing.

...but what is the "strange blow sound" and where does that come from?

Can you post a video on YouTube and put a link to it on here?

Originally Posted by Volvo940GL

I have fault cose 2-4-1 EGR flow too low. Could that cause the engine to not start? I have no idea what to do. I have checked everything an engine needs to cause a combustion.

I doubt an EGR with low flow would prevent it from starting....It would give poor running such as rough idling or persistent stalling.

I think vacuum controls part of its function. Are your vacuum lines all connected? Are there any splits?

Have you any other fault codes?

[Laird Scooby]

Originally Posted by 37 RUBY

From your verbal description, that sounds like an engine trying to start but fails to do so due to issues with ignition & fuel timing.

...but what is the "strange blow sound" and where does that come from?

Having a wild guess, i'd say it is overfueling and the excess fuel has begun to evaporate so the first try (before additional fuel is injected) allows a partial fire that could also cause a pop in the exhaust from excess fuel previously expelled.

Be interesting to see the video though!

[Volvo940GL]

Originally Posted by Laird Scooby

Having a wild guess, i'd say it is overfueling and the excess fuel has begun to evaporate so the first try (before additional fuel is injected) allows a partial fire that could also cause a pop in the exhaust from excess fuel previously expelled.

Be interesting to see the video though!

That’s probably it

[Volvo940GL]

Originally Posted by 37 RUBY

From your verbal description, that sounds like an engine trying to start but fails to do so due to issues with ignition & fuel timing.

...but what is the "strange blow sound" and where does that come from?

Can you post a video on YouTube and put a link to it on here?




I doubt an EGR with low flow would prevent it from starting....It would give poor running such as rough idling or persistent stalling.

I think vacuum controls part of its function. Are your vacuum lines all connected? Are there any splits?

Have you any other fault codes?

It backfires when I crank it. Not always it happens

[37 RUBY]

Originally Posted by Volvo940GL

It backfires when I crank it. Not always it happens

What firing order are the leads in from distributor cap to spark plug ?

[Volvo940GL]

Originally Posted by 37 ruby

what firing order are the leads in from distributor cap to spark plug ?

4-3-1-2

[37 RUBY]

I've found a guy on YouTube working on a Volvo 240 with similar issues

https://m.youtube.com/watch?v=dQsV31_ML2c

It may have some processes within you haven't tried

[37 RUBY]

Originally Posted by Volvo940GL

4-3-1-2

Are you happy this is correct for your engine?

Did you replace one lead at a time or could you have got any mixed up by mistake?