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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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Poor starting and blue smoke - help and adviceViews : 1508 Replies : 15Users Viewing This Thread : |
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Feb 21st, 2019, 21:41 | #1 |
Junior Member
Last Online: May 2nd, 2023 13:21
Join Date: Mar 2009
Location: Northants
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Poor starting and blue smoke - help and advice
I have an 850Tdi CD Auto P reg (Audi engine)
It smokes terribly when outside is cold, despite new glow plugs. Upwards of 5 degrees it is fine, but still has whisps of light coloured smoke. The strangest symptom is happens when you are going around 75mpg when torque converted lock up is in operation. If you ease off the throttle, then place it down again when the car is on the 'overrun', the motorway absolutely fills with thick blue smoke and the car clear 'chokes' and then fires back into line. At 50 or 60, it doesn't do it because the car is in effective free-wheel. Also, it is worse if you have travelled for a while at a constant speed, and once it has smoked, the second time is not so bad. My thinking is that somehow, oil is being sucked from the intercooler on the overrun, thus choking the combustion. Once clear, it doesn't happen again. The oil, is suspect, is coming from worn Turbo seals. Does this sound reasonable? Not much oil consumed between 5k services, however. It has approx 270k miles and is due a cambelt change. I am not sure whether the terrible starting is the same thing, or something else as well such as timing All thoughts welcome! |
Feb 26th, 2019, 21:23 | #2 |
VOC Member
Last Online: Today 09:24
Join Date: Dec 2001
Location: Hull
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I can't really comment on the smoke on overrun, but it's likely that the poor starting is probably due to the dynamic timing being a bit off. In practice, unless the weather is seriously cold, the glow plugs have little impact on the car's ability to start.
My 1998 Tdi auto (same engine) only struggled to start when the temperature got to below -10 degrees C but otherwise started first turn. It wasn't until I removed the cylinder head to repair the aftermath of a broken cambelt, that I discovered all 5 glow plugs were completely dead and probably had been for years! After repairs were completed and new glow plugs fitted, I can't say it's made the slightest difference to starting in normal winter conditions. For obvious reasons I'd suggest replacing the belts and tensioners asap and you'd normally do the dynamic timing at the same time when the new belts are in place. My guess is that this will probably resolve the starting issue. Martin 1998 V70 Tdi Auto 224,000 miles |
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Mar 26th, 2019, 13:09 | #3 |
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Last Online: May 2nd, 2023 13:21
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Location: Northants
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Thank you.
It seems that's the way forward. Will keep you posted. I've had a quote of £537, excluding new crank pulley. |
Apr 25th, 2019, 16:25 | #4 |
Junior Member
Last Online: May 2nd, 2023 13:21
Join Date: Mar 2009
Location: Northants
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I communicated with a chap at the local Volvo specialist who said that white smoke was timing issues. I think there are two smoke types here?
https://youtu.be/nkDyc_r1yQ4 |
May 5th, 2019, 16:08 | #5 |
Master Member
Last Online: Apr 22nd, 2024 06:42
Join Date: Jan 2015
Location: Blackpool
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Injection pump timing retarded by a large margin . My V70 Tdi was that bad at starting until I advanced the timing . You need the engine at 80C BEFORE you make any attempt to alter dynamic timing , even if the pump is only slightly out mine smokes like a pig & stinks
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May 6th, 2019, 00:37 | #6 |
DPF free.FCUK Greta he he
Last Online: Mar 28th, 2024 13:38
Join Date: Jun 2012
Location: Bristol
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Just watched the video. The amount of cranking it takes to start yours is ridiculous.
Your pump timing is way out !!! These start 1st time everytime in all weather conditions if the pump timing is spot on.These don't even need glowpugs and just serve to plug a hole. |
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