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Old 01-18-2003, 09:17 PM
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Post Black Engine Smoke when put to the Floor

1991 V-8/TPI Pontiac Formula, Engine is code an an F on ID, I paid an extra 1000$ when I ordered the car from the factory for this engine, can anybody tell me if there's anything special about this engine, I heard its an LT1 but I never heard of them put this type of engine into this year model. It has 2 cat verters. What does black smoke mean when I floor it down, I'm sure nothing good! How can I get rid of it,

Jim

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Old 01-18-2003, 11:06 PM
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A LT1 wasn`t offered until 93. you likely have a L-98 option. black smoke indicates it`s running too rich, too much fuel, there are many things to check such as fuel pressure. have you replaced the Oxygen sensors? they can cause this also if they`ve never been changed. check the throttle position sensor, and make sure you have no exhaust leaks, any leak will let air into the system making the oxygen sensor think the engine is running too lean and is adding additional fuel. I`m sure there are other area`s to check, but I haven`t worked on one in a long time. good luck.
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Old 01-18-2003, 11:47 PM
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Yes do what he said... O2 sensors sometimes get plugged... is your check engine light on? cuz sometimes an o2 sensor won't set it off..
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Old 01-19-2003, 06:32 AM
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[quote]Originally posted by stonedchihuahua:
<strong>Yes do what he said... O2 sensors sometimes get plugged... is your check engine light on? cuz sometimes an o2 sensor won't set it off..</strong><hr></blockquote>

Plugged? How about carbon fouled. I have heard you can blast them with a cutting torch and burn the carbon off to get them cleaned up and working again.

Chris

[ January 19, 2003: Message edited by: TurboS10 ]</p>
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Old 01-19-2003, 01:42 PM
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My check engine light isn't on, but it's been getting terrible gas mileage since this, never got more an 225 miles to a tank full, now it's more like 170,
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Old 01-19-2003, 01:51 PM
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well yeah by plugged I basically ment covered in crap cuz I don't talk technical like you guys
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Old 01-19-2003, 04:05 PM
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If you have noticed a decline in fuel mileage, have you also noticed a drop in performance??? The car is in definite need of a good quality tune up. Poor mileage could be a couple of things, plugged fuel nozzles, timing, catalytic convertors to name a few. I would consider the new "high flow" cats on the market. They're cheaper than a factory unit and flow much better. But first, get a thorough tune up which should check exhaust gasses.
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Old 01-19-2003, 05:58 PM
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[quote]Originally posted by 91formula:
<strong>1991 V-8/TPI Pontiac Formula, Engine is code an an F on ID, I paid an extra 1000$ when I ordered the car from the factory for this engine, can anybody tell me if there's anything special about this engine, I heard its an LT1 but I never heard of them put this type of engine into this year model. It has 2 cat verters. What does black smoke mean when I floor it down, I'm sure nothing good! How can I get rid of it,

Jim</strong><hr></blockquote>

Other than a tune up, when you hammer the throttle
you're in open loop, as in there is no O2 correction
in the fuel map for the engine, so rich is good...
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Old 01-19-2003, 06:40 PM
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Gentlemen,

Got a new ox sensor, Tried to put it in with basic tools, should have known better, have to wait till get correct tool to get it out, anyway after I reconnected the wire I started it up and actually had oil blowing from the exhaust when I revved her up, any idea what thats from, I took her for a fast ride and it doesn't seem to smoke as much when opened up
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Old 01-19-2003, 07:02 PM
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The rings are shot, although I have never seen them bad enough to blow oil out the tailpipe. You must have a lead foot. The motor will need rebuilt.
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Old 01-19-2003, 08:17 PM
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the engine doesn't smoke like a car that needs new rings, by this I mean the light smoke that happens even at idle, it has 78,000 original miles and really I don't have a lead foot, I changed the oil started it up and revved it, noticed 2 black oil marks on the ground, have no loss off performance at all,
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Old 01-20-2003, 07:15 AM
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Are the black mmarks oil? I'm guessing they aren't, rather they are water soaked carbon which is nortmal in a rich running engine. Rule of thumb is black smoke means running rich, blue/white smoke is burning oil. From what you have said, I don't think you are burning oil, just running a little rich on your metering rods, assuming you have an Edelbrock or Q-Jet, or power valve if you have a Holley. Get a tuning book for your particular carb and dial it in for your specific application. If you have fuel injection, you need to do the same air/fuel ratio tuning but I don't have a clue how to do it in FI! Get a book.
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Old 03-18-2003, 09:01 PM
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Update: I finally broke down and took it to a dealer, I had the ox sensor replaced, mass sensor, replaced,they put it on a computer, and still they couldn't find the problem, they said that my 1/5 injectors were acting funny (maybe) but they couldn't guarentee that was the problem, since they couldn't find out the problem they really didn't charge me for much labor, does anybody have any other ideas,
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