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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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Cannot start my Volvo 940 2.3 EstateViews : 2929 Replies : 36Users Viewing This Thread : |
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Mar 15th, 2018, 09:26 | #21 |
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Or this one...
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Mar 15th, 2018, 12:38 | #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 |
Mar 15th, 2018, 12:41 | #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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Mar 15th, 2018, 12:54 | #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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Mar 22nd, 2018, 06:30 | #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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Mar 23rd, 2018, 07:23 | #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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Mar 23rd, 2018, 09:19 | #27 | |
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Quote:
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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Mar 24th, 2018, 04:35 | #28 | |
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Quote:
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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Mar 24th, 2018, 05:34 | #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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Mar 24th, 2018, 08:20 | #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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