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Gas leaking into cylinder causing high compression when starts gas comes out exhaust

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Sounds like the needle valve in you carburetor is not sealing off when the float gets high enough. Clean it and make sure the float is adjust to the right level or some carbs have a little rubber piece down int the hole where the needle goes into. You may have to replace it. You can test it by blowing into the gas line with your mouth and while doing this raise the float up and the air should shut off when the float get half the way up. Hope this helps.

Posted on Oct 19, 2013

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Posted on Jan 02, 2017

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2 Answers

White smoke coming from exhaust.


Did you happen to pump gas from the green nozzle?

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Replaced thermostat on pontiac sunfire now there's smoke coming from coolant tank


Sounds like you have a leaking head gasket or damage to the engine from when it overheated.
A leaking head gasket can cause compression to leak into the cooling system and pull coolant into the cylinders which is burned out the exhaust. It does not have to leak into the oil.
A shop would check for exhaust gas in the cooling system and run a compression test on the cylinders.

Mar 04, 2013 | 2002 Pontiac Sunfire

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I have a 90 Chevy 1500. 305, blew the head gaskets. Replaced them, but now I have no compression in cylinder 1. But before I tore the engine apart I tested the compression with my thumb and it blew it off....


Could be hydraulic lifter is holding valve open. Bring no 1 cylinder to TDC firing Lock engine from turning and with adaptor inject air to cylinder. If air comes out intake manifold then intake valve leaking. If comes out exhaust, you guessed it exhaust valve not closing. If comes out sump then bypassing rings. If comes out of radiator , head gasket leak into cooling system

Nov 17, 2012 | Cars & Trucks

1 Answer

I have a 1994 nissan altima that has a rough idle, loses power


Before you start buying new parts, I have two suggestions. First, have the computer scanned for diagnostic trouble codes. Any fault codes that relate to your problem should be investigated.
Second, spend the money for a compression test of the engine. What you are describing could very well be a bad exhaust valve that leaks and causes high gas consumption, loss of power, poor idle, etc. A compression test will verify if there is such a problem, or not. And, if it turns out that compression is good and high and even in all cylinders, you will have peace of mind knowing the internal condition of your engine is fine, and you will have no problem with putting money in it to get it running right again.

Jun 17, 2012 | Subaru Legacy Cars & Trucks

1 Answer

White exhaust rich with gas 5.4 lt triton


I would suspect that there is a crack in the head allowing the coolant to mix into the cylinder,causing white smoke.The coolant is running low after a drive.I also would suspect some air is leaking into the cylinders.It may turn into a headgasket and head pressure test.also a block pressure test.But first do a compression test.And check if there are bubbles coming out of your radiator at the cap.These are signs that show a fault in the leak in the compression and engine.

Apr 25, 2012 | 1998 Ford Expedition

1 Answer

Hi guys! Own a golf 1.4 carb! 2004, I'm having problems with idel! Heavy on fuel and my compression is low now, I've changed my base plate, set the co,z on my car but still can't seem to get it...


Does exhaust smell like petrol - low on power? If so it's running on 3 or 2 legs, meaning ignition in one of the cylinders is not burning fuel. This causes irregular idle and high fuel consumption.

Low compression might indicate a leaking head gasket, worn cylinder rings. Remove the oil dipstick and check if there's pressure coming from the sump. This indicates worn cylinder rings - loss of compression.

Jun 26, 2011 | Volkswagen Golf Cars & Trucks

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How to know if I have a blown head gasket what is the symptom. 1999 Cadillac deville


The following are the most important symptoms with severity:

1. Leaking radiator.
2. Overheating and change of oil to milky appearance.
3. White smoke from exhaust
4. Coolant leaks.
5. Low of compression.
6. Coolant in cylinders.

Nov 13, 2010 | Cadillac DeVille Cars & Trucks

1 Answer

I am blowing oil out of the vent from the valve cover on a 70's 6040. Any answers to this problem?


This is called blow-by. Start with compression test to find out is rings are ok. Need more information like gas diesel, model number of engine. So here is a general run down. Compression is getting into crank case. Several things can cause this. Possible causes are bad valve guides, rings, head gasket valve stem seals. Compression test will tell if low cylinder. If this is ok for your year model look to valve stem seals. If two cylinders next to each other low. Possible head gasket leak. Use compressed air 60-90 psi and listen were air is going. If blowing into crank case or intake exhaust manifolds. If crank case rings if not valves. I am going to assume your engine is burning oil or using more then normal. Possible white smoke from exhaust. If this is the case and compression is good valve stem seals should fix it. Hope this helps. Remember when compressing cylinders have both valves closed on top dead cylinder.

Mar 18, 2010 | B&C Allis Chalmers Tractor B,c,ca...

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I have fuel and oil coming out of my exhaust. I also have gas,(lots of gas) in the motor. what could the problem be? The engine oil is completely gone, but I know that it was full.


your description leads me to believe you have either a bent exhaust valve, or a leaking head gasket. what may be happening is your intake valves work fine, so the fresh fuel is being pulled into the motor like it should. only when the piston rised to compress the air/fuel, it cant with that leak. so only a portion is actuall being burned, and the leftover fuel is sent out the exhaust. a less likely cause could be worn piston rings or a damaged cylinder sleeve. start by removing the head. you will see if the exhaust valve isnt seating properly. if needed, replace the valve, and definitely replace the valve guide seals. theyre inexpensive anyways. and once your head is off, the cylinders will slide off easily. then you can inspect them for wear or damage. if needed, bore the cylinders and install fresh pistons/rings. if your nervous about taking anything apart, then just have a technician do that work for you. but those are really the only possible causes.

Aug 03, 2009 | 1983 Suzuki Tempter GR 650

1 Answer

Hard starting smokes white like gas is getting into cylinders


White smoke in a small engine is oil. Oil in the cylinder will create too much pressure for the engine to achieve compression. Make sure the engine is not getting fuel into the oil and thinning the mixture (literally smell the oil... gasoline and oil smell nothing alike, if it smells like gas, it is). If this is the case, the carb is leaking fuel into the engine, thinning the oil and causing the oil to leak past the rings into the cylinder head, through the valves and, from there, into the exhaust to burn off. Black smoke indicates a direct fuel issue in a small engine, white is oil based.

Mar 11, 2009 | Craftsman 17.5 hp 42 in. Deck Lawn Tractor...

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