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Black smoke and doesnt want too idle when hot

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  • Cars & Trucks Master
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Black smoke if unburnt fuel

if carby
float adjust
air fuel mix adjust
timing or vacuume

Posted on Dec 09, 2016

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Posted on Jan 02, 2017

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Check engine light has reported that the cpu has found sensoes out of parametyers during the checks. Check fault codes for oxygen sensor, idle speed sensor and air flow sensor.

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Vw caddy sdi, when hot has a lumpy idle seems to shake the van, and leaves quite a bit of smoke,( blue tinted) at the traffic lights, doesnt seem to be using any oil over the last 600mile and seems to


The BST engine in your Caddy is prone to a couple of design flaws that can cause the trouble you are experiencing. Certainly, it could be an injector but could also be down to timing or the camshaft sensor. If you haven't had the timing belt changed, it may have stretched a tiny bit and that's enough to cause the problems you have with lumpy idle. Timing is adjusted on the camshaft pulley - but tiny adjustments can make a big difference. The EGR valves are also prone to sticking causing black smoke. Hope that helps a bit.

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Idle is very rough. drives but doesnt make power. wont pull past 3000 rpms


are all the cylinders firing.
is the fuel filter blocked.
is the air filter blocked.
is there black smoke coming out the exhaust.

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You've done a lot of work. How does your EGR valve look Its the 'space ship' gizmo under the air cleaner. Remove and decoke is a quick job and it may just cure the lot

May 07, 2010 | 1999 Chevrolet Silverado 1500

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It starts and runs fine maybe idles a little rough when you go to restart when hot or cold it stumbles and has a hard time getting a stable idle .


Sound to me like a bad EGR valve. Do you see black smoke if you try to give it gas whaen its stumbling?

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Black smoke and gas fumes coming from tailpipe


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2001 Jetta 1.8T, 100K miles. Smokes when hot.


Ouch! you've got engine coolant in the exhaust from a leak somewhere...DO NOT run this engine until you get someone (dealer is best in this instance) to diagnose ($50-125)

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MY 96 Nissan Maxima has rough idle and is blowning


blown head gasket. black smoke means that oil is getting into the cylinder.

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Car dies if accelerator is not engaged


the starting problem could be head gasket if it got really hot..... black smoke wouldn't be oil, and gas would stink but not black smoke if it's old, it wouldn't really matter if it had been sitting for 4 months. black smoke is probably caused by a gas mixture problem, or maybe a stuck fuel injector.

Feb 20, 2009 | 1990 Ford Taurus

1 Answer

Car idles high when cold


the black smoke means that it is buring the gas to rich.

Dec 01, 2008 | 1987 Ford Mustang

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