2nd Generation Specific 1986-1992 Discussion

Running Too Rich on Gas...

Old 02-12-2006, 12:44 AM
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Yea yea, im a newb. But i was wondering...

Every time i run my car it smokes in moderation. Sometimes alot sometimes only little... i was wondering if too much gas getting in and not being fully combusted could be the culprit... Symptoms...



Okay first obviously, smoking.

Doesnt smell like its oil or coolant, it smells like gas.

Misfires not excessively but once in a while.

I wasnt able to check my ignition system or my spark plugs, i didnt have a wrench the right size for my plugs.

Fluid is leaking out of my exhaust after about 1 minute of sitting at idle.

She idles around 1500rpm =(





Im also suspecting bad gas. The car sat for a while before i bought it and i havent been able to run all the fuel through, though i did add fuel to it. There was roughly 2 to 3 gallons of gas in the tank, and i added more to about half a tank. The car sat roughly 3 or 4 months i cant be too sure on the exact time. So yea, im not ruling out oil or coolant, but im just checking on the bad gas/bad combustion theory. Anyone have any other theories? Things i should look at? If you have questions which could help you, or others help me out, please let me know.
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Old 02-12-2006, 12:51 AM
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I forgot to mention, Its an 87 N/A, Base model.
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Old 02-12-2006, 01:57 PM
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the fluid coming out the tail pipes is prosibly condensation, wich is normal and nothing to worrie about. the smell is some what normal aswell with old fuel and the smoke, is it only on start up or is it all the time. rotarys smoke alot on start up due to the nature of the motor. but i would do a tune up with some good ngk plugs and fuel filter and air filter and so on.



randy
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Old 02-13-2006, 01:29 AM
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Originally Posted by fc3sboy1' post='801204' date='Feb 12 2006, 02:57 PM

the fluid coming out the tail pipes is prosibly condensation, wich is normal and nothing to worrie about. the smell is some what normal aswell with old fuel and the smoke, is it only on start up or is it all the time. rotarys smoke alot on start up due to the nature of the motor. but i would do a tune up with some good ngk plugs and fuel filter and air filter and so on.



randy


The Smoke is like all the time, though it lessens after a few minutes, it still smokes. Today i started the car and let it warm while i cleaned the snow off to move it out back, after about a minute it stalled out and wouldnt start back up... im pretty pissed =( Hope its just flooded ;P
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Old 02-13-2006, 02:00 AM
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its not a good idea to have a 7 without learnign about them a little..

it really can be alot of things, s4's (86-88) had a problem with the injectors sticking open, causes flooding, hard as hell to start... what color is the smoke? and do you have any mods? this will help to tell what the problems could be...
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Old 02-13-2006, 02:02 AM
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"its not a good idea to have a 7 without learnign about them a little..

" don't take that as an rude comment..
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Old 02-13-2006, 03:38 AM
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Originally Posted by spiney360' post='801395' date='Feb 13 2006, 03:02 AM

"its not a good idea to have a 7 without learnign about them a little..

" don't take that as an rude comment..


Not at all ;P But in my own defense i learned alot about them, just that this s*** popped up, and i cant figure it out. The smoke it a white/grayish but doesnt smell like coolant or gas.

As for mods, no, bone stock. Tomorrow im taking out the plugs/replacing them and checking my ignitions system.



Today it stalled and wouldnt start back up as i mentioned before, we tried pulling the fuse for the injectors so they wouldnt inject fuel and turning it over, to clear flooded gas, 3 or 4 times for 10 seconds each. Then replaced the fuse... no luck when we tried afterwards. While i have the plugs out im first obviously going to check the plugs for deposits/cleanliness, then i will be checking compression, and also im gonna go through the ignition system in general. ill let you guys know if anything pops up.
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Old 02-13-2006, 09:55 AM
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The plugs are your best clue.

They are right in there where combustion is not happening.

Just pull the leading (bottom) plugs.



Also, if you are flooded, the fuel usually washes out the oil needed to make start up compression. Then the engine cranks faster with almost no compression surges in the starter gear noise.
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Old 02-13-2006, 02:20 PM
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Originally Posted by sureshot' post='801437' date='Feb 13 2006, 10:55 AM

The plugs are your best clue.

They are right in there where combustion is not happening.

Just pull the leading (bottom) plugs.



Also, if you are flooded, the fuel usually washes out the oil needed to make start up compression. Then the engine cranks faster with almost no compression surges in the starter gear noise.


My exact reasoning for pulling the plugs initially, secondly, was to check the ignitions system, as i havent done that since november when i bought my 7.
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Old 02-14-2006, 03:22 PM
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Well, changed the plugs, and she started right up no problem. I didnt get a chance to check compression, since im poor and cant afford a compression gauge, and i didnt have an assistant around for the poor mans compression test. But the ingitions system looks fine, im gonna look around for vac leaks and see if i can find anything. The plugs werent terribly black, but they werent clean either, they looked about right to me for the time they were in, just werent sparkin enough to get the engine runnin i guess. As for the smoking, its still goin, cant tell what it is, if it was oil burning wouldnt the spark plugs have been CAKED with black soot? i didnt really see any, just the normal deposits of combustion.
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