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Diesel Engines A forum dedicated to diesel engines fitted to Volvo cars. See the first post in this forum for a list of the diesel engines. |
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Difficult morning startViews : 1401 Replies : 13Users Viewing This Thread : |
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May 6th, 2020, 18:36 | #1 |
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Difficult morning start
We have a 2006 Diesel S 40 2lt with 240K Km. The engine seems to be running perfectly, the engine doesn't use any oil. Recently serviced. Just had a new battery replaced. First thing in the morning the car is really rough starting and has to be cranked several time before the engine catches. No smoke. Any help would be appreciated.
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May 6th, 2020, 20:50 | #2 |
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Check you have decent battery voltage, then fuel. When was your last fuel filter change?
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May 7th, 2020, 12:05 | #3 |
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glow plugs
First suspect in diesel starting are the glow plugs. On a 940 it takes 3 of these or more out to stop it. You can test by (briefly) attaching to 14V, it can also be done by checking the resistance. If the glow plugs are ok next stop is the glow plug relay.
jor
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May 7th, 2020, 12:49 | #4 |
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No smoke suggests no fuel, if the glow-plugs were failing I'd expect a lot of smoke on start up?
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May 7th, 2020, 12:52 | #5 |
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May 7th, 2020, 12:55 | #6 |
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Once the car has been started for the first time it generally starts ok, but not as fast as it used to but on the first crank. The engine is running well, no misfires or spluttering. The start is rough the whole engine block really shakes. I read that the Fuel Pressure Regulator can give trouble, but would this only be a problem on the first start?
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May 7th, 2020, 12:58 | #7 | |
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Quote:
Did you do the filter yourself?
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V70 2.4 Phase 1.....2435cc.....Registered 31/3/2000.....Leather,AC,CC,etc!.....182k |
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May 7th, 2020, 13:01 | #8 |
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Ahh, I'm assuming this is a common rail engine. Sorry I'm not familiar with the S40 or what's specifically under the bonnet.
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V70 2.4 Phase 1.....2435cc.....Registered 31/3/2000.....Leather,AC,CC,etc!.....182k |
May 7th, 2020, 13:05 | #9 |
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Maybe having it plugged in to a diagnostic machine for a cold start would be the way to go...……... Observing RPM signal and fuel pressure reading.
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V70 2.4 Phase 1.....2435cc.....Registered 31/3/2000.....Leather,AC,CC,etc!.....182k |
May 7th, 2020, 18:47 | #10 |
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Something else for you to consider...as you look at the front of the engine, on the inlet manifold, check the shut off throttle is reopening, ready for the next start, after you switch off the engine. If it is sticking in the closed position the engine can't/won't breath. As it's made from plastic it deforms over time so a new replacement is the best option. The reason it eventually starts is because the shaking releases it.
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