Question about 1983 Pontiac Firebird

1 Answer

I have a 79 t/a with a 403. the last time i started the car it had a knock. when i checked the oil dipstick it smelled as if fuel was leaking into the oil.i pulled the valve covers off and the heads where spotless as the fuel was probably cleaning everything inside the block. at what point do you think the fuel is mixing with the oil?

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that gotĀ 5 achievements.

    Governor:

    An expert whose answer gotĀ voted for 20 times.

    Scholar:

    An expert who has written 20 answers of more than 400 characters.

  • Expert
  • 99 Answers

It's likely the float sunk in your Quadrajet and fuel is entering your crankcase through the cylinders. The knock may or may not be related. Replacing the float and needle valve and seat will fix the problem.

Another cause may be that you are not getting a complete burn of your fuel (which is a beautiful thing about muscle cars!) and a rich blow-by is entering your crankcase, giving you a fuel smell in your oil. The knock could also be from a poor tune-up, timing too far advanced or low octane fuel. Depending on the knock, it is possible that there is a mechanical problem, but you didn't mention any problems with the way the engine runs.

Posted on Aug 08, 2008

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Motor oil went up a lot in the crankcase


Assume you mean the engine oil level on the dipstick is getting higher?

I would be surprised if it is hydraulic oil (unless you know different) but I suppose diesel fuel is a possibility though it is many years since I have heard of such a thing, especially if the engine is otherwise running smoothly.
The last time I saw that was on a small diesel engine with a conventional dpa type injection pump driven by oil-fed gears. The pump had sprung a leak and begun to fill the engine. There was no mistaking the strong smell of diesel...

An internal coolant leak can have the same effect but without the smell of fuel.

Mar 28, 2016 | Cars & Trucks

1 Answer

I have a 1997 Chevy cavalier z24 it's hard to start it and when it does start I smell raw gas I just replace spark plugs and map sensor and throttle body sensor wen put it in gear a the car die


I saw what you replaced, but, didn't see any testing? Use a gage and check proper fuel pressure. Also, see if pressure will hold for a bit, everything off. If the pressure drops like a rock, you have a fuel pressure leak. Check fuel pressure regulator vacuum line, if it has gas in it, the regulator is faulty. Could have leaking fuel injector or the fuel is leaking back through the fuel pump.
Any applicable trouble codes? To check codes yourself, at the least, you need an obd2 code reader.
Your coolant temp sensor might cause it to flood, if it is flooding? How long since a tune-up? Don't replace anything unless your testing points in that direction.
Smell of the crankcase oil dipstick, if it smells like gas, I wouldn't drive it till you fix the problem. Change oil and filter as many times as needed to get rid of the gas.

Feb 02, 2016 | Cars & Trucks

1 Answer

Mitsibushi pajero oil light time


White SWEET smelling smoke, or white OILY smelling smoke? If it's white thick SWEET smelling smoke, you have a blown head gasket - that's the smell of antifreeze burning in the engine, which it should NEVER do. If it's white OILY smelling smoke (smells a lot like diesel), then you're getting too much fuel into the cylinders.

If it's sweet-smelling smoke (antifreeze), pull the oil dipstick & check the oil level. If the oil level is HIGH and the oil looks like a mocha milkshake, that's absolutely conclusive - that's what happens when antifreeze gets into your oil, and it's nasty corrosive to engine parts.

I'm not at all surprised that the oil light is on if it won't start - you won't get much oil pressure until the engine is running.

Nov 05, 2013 | Cars & Trucks

1 Answer

I own a 93 toyota pick up,just replace the headgasket,after couple weeks of driving it,i nothice power loss,and alot of engiane knocking...and the started noticeing gas smell on my oil dip,and its very...


if its kknocking thats not a good sign thats usually a motor rebuild but if its a tap then it could be a lifter or something loose under the valve cover ive had the tapping noise and knocking happen to me tapping on a 67 chevy truck turns out it was the lifters then knocking in a 92 honda accord turns out it was a bent rod so it had to have the motor rebuilt as far as power loss it may have a clog in a fuel line or something shouldnt be the pump unless the vehicle doesnt start or it shuts off while driving, and the smell of gas on the oil dipstick im not to familiar with that but im positive that thats not good;

Feb 21, 2012 | 2006 Renault R5

1 Answer

1990 buick century limited/ v-6 engine has fuel in the oil. need a fix.


could be a bad fuel pressure regulator. if they do fail, then it may result in low pressure. Mostly, the diaphragm in the fuel pressure regulator develops a leakage and the fuel enters the vacuum hose. This may lead to various kinds of troubles in the engine. Signs of a Bad Fuel Pressure Regulator
  • The vehicle engine runs rough and often stumbles and sputters.
  • The engine will not start after ignition. Usually, this problem is encountered in the morning when you start your vehicle. Many times, the engine starts, but stalls shortly after starting.
  • The fuel pump in the vehicle becomes noisy at times.
  • A bad fuel pressure regulator can also result in fouled spark plugs.
  • Last but not the least, the fuel mileage of the engine decreases noticeably. if above signs appear, replace fuel regulator. Check the oil dipstick and see if you smell fuel on it. If you do, it could be a symptom of a bad fuel regulator. The regulator has allowed gasoline to leak into the oil system.


Feb 05, 2012 | Cars & Trucks

1 Answer

Burning oil smell after short drive beneath car under driver. No leaks or panel lights showing. Entermitten knock sound between radio panel and auto stick shift. Vehicle runs good. Noise started last week.


OIL BURNING SMELL PROBABLY COMING FROM THE EXHAUST AT TAIL PIPE WHERE CAR BURNING OIL.KNOCK NOISE AT RADIO AND TRANSMISSION SHIFT STICK COULD BE STICK SHIFT LEVER MOUNTING BOLTS COULD BE LOOSE OR SHIFT LEVER BROKEN.

Sep 21, 2010 | 1997 Toyota Avalon

1 Answer

There's a knock on start up, and when I checked the oil none registered on the dip stick, no visible leaks and no oil stains anywhere. I only just gave it an oil change. There was no oil light warning at...


no oil on dipstick is a very BAD THING make sure you have oil in the motor before you do anything else!!! or else it can cost you a motor if you did your own oil change,,, did you put oilpan plug back in? did you tighten the oil filter? did you put 5qts oil back into motor? there SHOULD BE A READING ON THE DIPSTICK. new oil looks almost transparent on the dipstick. try rubbing your finger on the dipstick to check for oil presence. look real close at the dipstick before you start your motor!!! if you added 5qts oil it went somewhere,are you sure it went into the motor? if no oil in motor there will be loud knocking from the motor. hope this helped you save your motor!!!!!

Aug 25, 2010 | 2004 Subaru Impreza

1 Answer

I have what appears to be a oil and fuel leak. 1988 olds toronado


1. Check the oil (with dipstick) see if it smells the same as the oil spot you were detecting.

2. Fuel leaks are usually accompanied by a strong odor of fuel and time the vehicle is running.

I will guess that this car has quite a few miles on it. Having the gas ending up in the oil a bit is normal for high miles engines. As they get older they should be changed more often to keep this from happening.

As for the oil leak, only a visual inspection can determine the leak source. I would bet on a seal.

Feb 04, 2010 | 1988 Oldsmobile Toronado

1 Answer

Oil light comes on and the engine begins to make a knocking sound


how much oil is left in the engine ?
the smoke was probaly oil burning,the knocking could be from low oil pressure,this could be very bad.check the oil and coolant levels and repost and let me know how they are.if any oil shows on the dipstick smell it and see if it smells burnt.

Nov 15, 2008 | 2005 Toyota Corolla

1 Answer

Oil leaking..


Sounds like your oil leak is finding hot exhaust manifold and smoking/smelling. Make sure the oil filler caps and breather hoses that connect to the valve cover (Top of Engine) are attached securely. Try and determine exactly where the oil leak originates [Valve covers - top side, oil pan - underneath, or shaft seals - front and rear of engine, or left and right ends with the sideways (transverse) engine mounting]. Also check oil level - a blown head gasket or cracked head or block could lose coolant into the oil reservoir, causing an overfilled and thus leaking situation... this will show up as a creamy looking substance on the dipstick. If the engine is not making any other signs of abnormality, strange knocks or clicks, overheating, or losing gross amounts of fluids, make sure it has enough oil in the crankcase and drive it to a reputable mechanic for a true evaluation of the problem.

Jun 02, 2008 | 1995 Hyundai Sonata

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

147 people viewed this question

Ask a Question

Usually answered in minutes!

Top Pontiac Experts

yadayada
yadayada

Level 3 Expert

61249 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21949 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6812 Answers

Are you a Pontiac Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...