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Cannot start my Volvo 940 2.3 Estate

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Old Mar 15th, 2018, 10:26   #21
Rversteeg
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http://stepbystepvolvo.com/Resources...20No-Start.pdf
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Old Mar 15th, 2018, 13:38   #22
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N-registration should be 1995. Which anti-theft system your car is comming with?
Till 1995 they are with a stick you have to put into the dash. From year of model 1996 (august 1995 and on) it is inside the key. The stick ones are prone to be bad. The later ones not. A ECU with a pink label is prone to fall into sleep too.
The stick ones are pita to bridge over
The key ones you will test with a ECU till 1995

Good luck , can't be too hard to solve this, Kay
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Old Mar 15th, 2018, 13:41   #23
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I have a working LH2.4 ECU from a 1995 M reg car, you could try. If that is any help. I believe there are 2 possible systems on these cars, but if it is any help, I can bung it to you in the post.
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Old Mar 15th, 2018, 13:54   #24
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Can you get the garage to try a known good fuel pump relay and see if it fixes the problem ?
I couldn't swear to it, but I think those relays are two relays in one. One half works the fuel pump, the other bit powers the injectors. It may be intermittently failing, which is a common fault, especially considering those relays are in a warn, confined space inside the dash, they're powered up all the time the engine is running, and even the newest of the 940s are over 20 years old now.
For a DIY mechanic or electrician, they're easy enough to check. Just remove the cover and check for dry solder joints with a magnifying glass. If you find any, resolder them. Most of the ones I've checked have been faulty.

As for possible immobiliser faults, my M reg 2.0 hpt has the earlier system, with the red LED thing on the drivers side windscreen pillar. When they fail, the engine usually won't even spin on the starter, and it'll sound a single tone siren and flash the hazard lights.
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Old Mar 22nd, 2018, 07:30   #25
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Hi All

Thanks for all the ideas

I have not been so well lately so I was unable to look at the forum

I have passed all the postings to my garage guy
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Old Mar 23rd, 2018, 08:23   #26
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If this garage dose not own a good Scan tool and a Pico scope then walk away, they are fitters and not diagnostic technicians. Working with the info provided:
Plugs are wet, suggesting pump is priming the fuel rail and the injectors are pulsing.

Spark at the plugs are present.

Compression is good.

Cam and crank timing appears to be correct.

There is one fault I have come across before with the 940 and 700 series and that is the bottom crank pulley key way can erode/shear and the pulley moves. This gives the appearance that the engine timing is correct but the valve timing will out. Remove lower pulley and inspect keyway!

This could be checked in 5 minutes with an oscilloscope and pressure transducer.
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Old Mar 23rd, 2018, 10:19   #27
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Quote:
Originally Posted by KBB View Post
If this garage dose not own a good Scan tool and a Pico scope then walk away, they are fitters and not diagnostic technicians. Working with the info provided:
Plugs are wet, suggesting pump is priming the fuel rail and the injectors are pulsing.

Spark at the plugs are present.

Compression is good.

Cam and crank timing appears to be correct.

There is one fault I have come across before with the 940 and 700 series and that is the bottom crank pulley key way can erode/shear and the pulley moves. This gives the appearance that the engine timing is correct but the valve timing will out. Remove lower pulley and inspect keyway!

This could be checked in 5 minutes with an oscilloscope and pressure transducer.
And this has no relation to his problem. The vibration damper is prone to throw out the rubber and twist the inner and the outer part. If you look at the marks you will think timing is of. Till now I've seen never ever a shared key and a moved pulley while everything is fixed on a Volvo B2xx engine. If the center screw isn't fixed maybe. I did disassembke a lot of B2xx and I havn't seen a shared key till now. A twisted vibration damper I did find sevetal times. Don't trust the marks.

The LH2.4 is really simple. The pinc ECU ones are a prob. Everything else is very easy to do a diagnose.

Good luck, Kay
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Old Mar 24th, 2018, 05:35   #28
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Quote:
Originally Posted by mocambique-amazone View Post
And this has no relation to his problem. The vibration damper is prone to throw out the rubber and twist the inner and the outer part. If you look at the marks you will think timing is of. Till now I've seen never ever a shared key and a moved pulley while everything is fixed on a Volvo B2xx engine. If the center screw isn't fixed maybe. I did disassembke a lot of B2xx and I havn't seen a shared key till now. A twisted vibration damper I did find sevetal times. Don't trust the marks.

The LH2.4 is really simple. The pinc ECU ones are a prob. Everything else is very easy to do a diagnose.

Good luck, Kay
Interesting remark that this has no relation to his problem. Consider the facts as they have bee presented. 1 the plugs are wet suggesting the fuel pump has primed the rail and the injectors must be pulsing for fuel to have reached the cylinders. 2 spark has been checked so would suggest ignition system is working and producing sparks. 3 compression has been checked and said to be ok. So the only thing that has been checked is the physical cam and crank timing by looking at the timing marks This is not the same as dynamic timing. Sheared keyways on cranks are more common than you think.

Here is an case study of a sheared cam pulley alignment pin, the same symptoms are true of a damaged and slipped crank key-way

http://www.automotivetestsolutions.c...447-miles.html
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Old Mar 24th, 2018, 06:34   #29
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concur with KBB. I had a half-sheared key in the crank/pulley (its a pin isn't it?) when we did the cam belt on Moomin. Had to set new marks to reassemble correctly.

It's definitely a thing.
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Old Mar 24th, 2018, 09:20   #30
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Cam sprockets I've seen broken on Volvo B2xx engines. Crank sprocktes/ keys I've not sen broken till now. Damaged ones by stupid mechanics, yes several times.
Worn out distributor shafts and distributor drive shafts at 240 engines, yes too. Not his engine
Broken distributor drive at a cam driven distributor ones at a B2xx. Broken rotors several times. I don't know if this car is maintained well in the past.

To diagnose a broken sprocket at the cam will be easy. Remove one plug and the valve cover. A standart workshop should be able to do this.

I'm interested in this fault at his car.
We love these elks in our family because they never struggled till now.
Only not working anti-theft systems are a pain.
Good luck, Kay
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