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Old 02-25-2010, 07:34 PM
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Troubleshooting smokey exhaust

So I finally got the car running with the new powerjection fuel injection system but have a problem. The car has some smoke exiting both exhaust ( have true duals) but is much worse on the drivers side. The amount of smoke increases as the car warms up. These observations are while at idle. I understand that white smoke is usually water, blue smoke oil, and black smoke fuel. I really cannot tell what color the exhaust is. I did hold a paper towel to the exhaust while running and on the drivers side there was a black deposit on the towel when I removed it. So is this fuel or oil? The fuel injection smoothed out my idle a lot but I still hear a slight hiccup on the drivers side exhaust. Could a fouled plug be the culprit? Ideas? Differential diagnosis?
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Old 02-26-2010, 01:51 AM
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it sounds like to me that you might need to do a ring job or a valve job on your motor if since you said you put a fuel injection system on it the black on your paper towel is more then likely oil but I would pull my plugs first and see if you have oil on then if you do then you more then likely need to do a ring job
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Old 02-26-2010, 06:55 AM
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Ayuh,... Do a Compression Test so you're dealing with a Known commodity....
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Old 02-26-2010, 07:29 AM
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If you have access to the equipment, a leakdown test will tell you more than a compression test.
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Old 02-26-2010, 08:07 AM
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Quote:
Originally Posted by swoodard23
So I finally got the car running with the new powerjection fuel injection system but have a problem. The car has some smoke exiting both exhaust ( have true duals) but is much worse on the drivers side. The amount of smoke increases as the car warms up. These observations are while at idle. I understand that white smoke is usually water, blue smoke oil, and black smoke fuel. I really cannot tell what color the exhaust is. I did hold a paper towel to the exhaust while running and on the drivers side there was a black deposit on the towel when I removed it. So is this fuel or oil? The fuel injection smoothed out my idle a lot but I still hear a slight hiccup on the drivers side exhaust. Could a fouled plug be the culprit? Ideas? Differential diagnosis?
Thanks
Which Powerjection do you have?

A TON of things could be the issue, but assuming there was no smoke BEFORE the system was installed, it will be fuel-related, IMHO.

How would you describe the idle quality? Overall, how does the car run and drive? Have you looked at the plugs?

Where's the O2 sensor located? If you're using the clamp-on deal, be real sure there's no leakage.

Are you tuning via laptop or by the EMS/STT software? What's the fuel pressure? MAP working as it should?

Look for simple things first- something as small as a vacuum leak will let the O2 sensor 'see' a lean condition and then it will respond by dumping in fuel to try to "cure" the problem, so to speak.

The adaptive learning can take some time- you need to drive it for some time for this to fully happen, unless you're tuning by laptop.
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Old 02-26-2010, 06:26 PM
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It is a powerjection I. I am using a clamp on o2 sensor and there is an exhaust leak as evidenced by the black soot which had stained the pipe where the leak was. I will fix this first. I removed the o2 sensor and there was A LOT of black soot on the sensor. I'm hoping this is just a fuel issue. The sensor is mounted on the passenger side where the exhaust goes horizontal and is at about a 10 o'clock position.
I do have a laptop with the dashboard software but have not used it to tune the system other than set the throttle position limits.
I bought a compression gauge and new spark plugs but am not going to change anything until I try again with the O2 clamp fixed.
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Old 02-27-2010, 12:18 PM
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Quote:
Originally Posted by swoodard23
I bought a compression gauge and new spark plugs but am not going to change anything until I try again with the O2 clamp fixed.
A compression tester is a good tool, a vacuum gage might serve you better in this case...

Fixing the O2 sensor air leak will definitely be needed, regardless if it's the sole cause or not, so good deal. Are you going to weld a bung? They're available if you wanted to go this route.

I don't know if the instructions say where to locate the O2 sensor, but it has to be close enough to come up to temp. If it doesn't, the system will not go into closed loop.

Keep us posted...
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Old 07-16-2012, 03:20 PM
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Same issue as above

I have a brand new motor (351C 4V stroked to 408) with the PJIII installed with true dual exhaust (no "X" pipe). I am having black soot coming from the left bank, none from the right. My O2 sensor is located on the right side exhaust at about the 10 o'clock position looking from the rear.

Doesn't smell like gas; which means it may be condensation? But why am I not getting the same from the right bank?
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Old 07-16-2012, 04:14 PM
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Quote:
Originally Posted by Dustoff-00 View Post
I have a brand new motor (351C 4V stroked to 408) with the PJIII installed with true dual exhaust (no "X" pipe). I am having black soot coming from the left bank, none from the right. My O2 sensor is located on the right side exhaust at about the 10 o'clock position looking from the rear.

Doesn't smell like gas; which means it may be condensation? But why am I not getting the same from the right bank?
Have you tasted it to see if it's water or antifreeze? But seriously, you need to determine if it's coolant or "fresh" water/condensation.

Often the smell will give water away if used in the cooling system instead of antifreeze even after going through the exhaust system. If it's antifreeze, that should be fairly easy to determine either by smell or color.

If it's water and not from the cooling system, it may be (for instance) the exhaust system on one side got water in it while the engine bay was being hosed off, or rain water entered the exhaust while the engine was out, or if one muffler was involved w/a blown head gasket that was pushing water out of the exhaust on just one side. Water inside a muffler can take a good while to evaporate out.
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Old 07-16-2012, 04:24 PM
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Thanks for the reply....

Taste test revealed no adverse reactions and doesn't have the color of anti-freeze (mixed 50/50). I have new headers; although the old ones may have gotten wet while engine was out.

The soot coming from left bank is black so water color is hard to determine. I did a "sniff" compare to what was in the radiator to what I collected on a rag. Not even close......

I'm thinking water, just odd that both sides don't have same issue.
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Old 07-16-2012, 04:27 PM
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Quote:
Originally Posted by Dustoff-00 View Post
Thanks for the reply....

Taste test revealed no adverse reactions and doesn't have the color of anti-freeze (mixed 50/50). I have new headers; although the old ones may have gotten wet while engine was out.

The soot coming from left bank is black so water color is hard to determine. I did a "sniff" compare to what was in the radiator to what I collected on a rag. Not even close......

I'm thinking water, just odd that both sides don't have same issue.
There's a fair to good chance that you will not continue to see this after you put a few hundred miles on it.
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