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vauxhall astra design twinport mk v(5) 2005
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kevintesta
New User
Feb 14, 2013, 5:06 PM
Post #1 of 8
(2873 views)
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vauxhall astra design twinport mk v(5) 2005
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Hello,
I am having problems with my car these are symptoms -
vauxhall astra design twinport mk v(5) 2005 1.6 has done 70K miles
Failed on MOT all emissions (See link)
http://postimage.org/image/shio5k08b/
- Running very lean
- ECU putting tons of fuel in because of lean running so its eating tons of fuel
- White intermittent smoke from exhaust only seen myself once
Garage number one says (After MOT fail on emissions) -
The o2 sensor gone and needs a new CAT. (£550)
Garage number two says (After emissions fail and white smoke)
- Needs new engine (Piston rings gone) (£1500)
What I have done
- New sparks
- New air-filter
- Various chemical cleans (RedX, Injector Cleaner, Cataclean)
- Only one error code now cleared and not returned (Running lean)
-Linked to laptop no obvious problems
Possible problem
- the o2 sensor might not be functioning correctly seems to take some times a few seconds to cycle further testing will be done on weekend although this does not explain white smoke.
Points to note
- Car idle perfect
- Car drives fine
- Using lots of fuel
-No signs of blow headgasket
When the car was running I put my hand under exaust fumes and it was so hot it burnt
when the car was blowing white smoke I put my hand in same place and it was just warm air, I could also feel flicks of liquid got a white piece of paper and the liquid was clear like water.
Any suggestions as to what could be causing white smoke.
Originally thought maybe the cat is dead but this would not cause smoke.
Then thought maybe its unburned fuel but this would be black smoke.
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Discretesignals
Ultimate Carjunky
/ Moderator
Feb 14, 2013, 5:46 PM
Post #2 of 8
(2841 views)
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Re: vauxhall astra design twinport mk v(5) 2005
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Don't have that vehicle here in the states, so advice may be somewhat limited.
Does the smoke smell sweet? Do you have to add coolant? Could be condensation that forms in the exhaust steaming up.
Your going to have to get it to a shop that knows what they are doing instead of someone guessing and telling you it needs an engine.
There are methods of testing the functionality of O2 sensors and diagnosing lean trouble codes.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Discretesignals
Ultimate Carjunky
/ Moderator
Feb 14, 2013, 5:55 PM
Post #4 of 8
(2831 views)
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Re: vauxhall astra design twinport mk v(5) 2005
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It could be the O2 sensor is stuck in the lean state and the engine controller is just dumping fuel into the engine when the engine is actually not running lean.
Raw unburnt fuel can cause white smoke if there is enough of it getting into the exhaust. But the engine would be running really bad and something like that really only happens if a fuel injector is stuck open.
One thing that you could try is unplugging the front o2 sensor ( the one before the catalyst). This will force the fuel system into an open loop state. Open loop means the engine controller isn't using the O2 sensor for trimming the fuel adapts. If the engine runs better and your richness goes away, you probably have a stuck lean O2 sensor.
Vacuum leaks, low fuel pressure, clogged injectors, and skewed MAF sensors will also cause lean codes. It is important to look at fuel trims at different engine loads to figure out what could be causing the problem.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Feb 14, 2013, 6:00 PM)
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Discretesignals
Ultimate Carjunky
/ Moderator
Feb 14, 2013, 6:23 PM
Post #6 of 8
(2814 views)
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Re: vauxhall astra design twinport mk v(5) 2005
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Need to get hold of a scan tool with data stream capabilities and function test the O2 sensor to see if it is reporting correctly and look at fuel trims to see how much the engine controller is compensating for the reported lean condition.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Feb 14, 2013, 6:23 PM)
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kevintesta
New User
Feb 15, 2013, 8:07 AM
Post #7 of 8
(2792 views)
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Re: vauxhall astra design twinport mk v(5) 2005
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New update -
I have some picture to follow.
While the car was idleing about an hour on and off. I noticed a large puddle on the floor by exhaust after smelling it, it just seems to be water but as I understand it no fluid should be coming from exhaust. This was accompanied by small amount of white smoke.
Checked the coolant and doesn't seem to be going down going to buy a test kit from eBay to check the gasket.
idle only results
http://postimage.org/image/3xs5cmb4n/
http://postimage.org/image/tknojkaxn/
http://postimage.org/image/qkbfgrp0b/
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Discretesignals
Ultimate Carjunky
/ Moderator
Feb 15, 2013, 9:18 AM
Post #8 of 8
(2780 views)
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Re: vauxhall astra design twinport mk v(5) 2005
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Can't really tell what exactly the o2 sensor is doing in those static pictures, but the O2 sensor doesn't appear to be stuck in the lean state. The long term and short term fuel trim numbers are near perfect at idle speed. That means the computer is making minimal changes and isn't compensating for excessive lean or rich fuel mixtures at idle speed. Don't know really know what is going on at cruising speeds though.
If you have a pressure tester, you could remove all the spark plugs and let the engine sit over night with the coolant system pressurized. Then look to see if there is coolant in any of the cylinders the next day.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Feb 15, 2013, 9:37 AM)
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