Question about 1998 Pontiac Firebird

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1998 firebird is leaking oil into the coolant

1998 firebird is leaking oil into coolant and is running ruff now

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  • caponerob
    caponerob Feb 21, 2012

    i changed the intake and plenum gasket. it runs allot better, but now i had a diagnostic ran on it and it says i have multiple miss fireing

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  • 431 Answers

Sounds to me like head gasket, have a compression test done to establish this. hope this helps an if you need any more info, just ask

Posted on Feb 18, 2012

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SOURCE: gearbox oil leaking

Dip stick tube has a rubber boot it slips thru, that seals it to trans. If its got a kick down cable there is a rubber o ring on that too, or front pump seal on trans is leaking.

Posted on Feb 14, 2009

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SOURCE: Coolant leak on a 1998 pontiac firebird v6

It's probably your water pump dripping down behind the harmonic balancer. Many GM water pumps have a hole in the top of them. When they start to go bad, they start to leak out of that hole. I guess it's GM's way of "letting you know" there is a problem. If your water pump would just seize, and no indication was there, so you knew, you could burn you engine up in 10 minutes of driving.

Posted on Sep 04, 2009

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I have a 89 pontiac firebird Trans Am "GTA" 5.7L tuned port injected. My engine gets hot somehow and my car has a quick start but lower power afterward. What could the problem be?


Fix the radiator cooling problems. You will damage the engine if you keep running the car in an overheated condition.

1. Replace the thermostat in the cooling system
2. Replace the water pump
3. Flush the cooling system thoroughly and re-fill with the correct coolant. Bleed any air out of the system otherwise you will have problems with air blockages and thus poor coolant flow.

You probably do not know how to do any of this so take it to a reputable workshop or cooling specialist to have it done.

Dec 25, 2012 | 1989 Pontiac Firebird

1 Answer

1998 hona civic ran hot, leaking hose, replace, now car runs rough when first driving it,could it be a blown head gasket


look for coolant in your oil ,the oil will look ''milky'' if there is coolant mixed in it. if you have milky oil then you have a blown head gasket. if thats not the case then we have to look elsewhere. hope this helps

Oct 19, 2011 | 1998 Honda Civic

1 Answer

My cadi 1988 is running ruff and quit running feels like over heating but no leaks, just smells


REPLACE THERMOSTAT AND RADIATOR PRESSURE CAP.MAKE SURE COOLANT NOT LOW.IF ALL IS GOOD CHECK FOR LEAKING WATER PUMP WEEP HOLE IF LEAKING REPLACE WATER PUMP.MAKE SURE COOLING FANS RUNNING.IF ENGINE RUNNING HOT WHILE SITTING LONG TRAFFIC LINE AND COOLANT NOT RUNNING.CHECK COOLANT FAN RELAYS AND FUSE.IF ALL IS GOOD HOT WIRE MAKE SURE COOLING FAN MOTOR GOOD IF COOLING FAN DONT RUN WHEN HOT WIRED FAN MOTOR BAD.IF FAN MOTOR OKAY AND FUSE RELAYS GOOD YOU HAVE FAULTY COOLING FAN WIRING.YOU COULD HAVE BAD ENGINE COOLANT SENSOR OR FAULT IN ECM CODE SCAN TO CHECK THEM BOTH.CHECK ENGINE OIL.LOOK LIKE MILK SHAKE YOU HAVE LEAKING HEAD GASKET.IF OIL LOOKS OKAY.YOUR ENGINE BLOCK, RADIATOR AND HEATER CORE NEED FLUSHING.

Sep 20, 2011 | 1988 Cadillac Sedan DeVille

1 Answer

Loosing coolant and can not find leak


Three additonal places to check:

1) Pull your dip stick and see if the oil on it shows signs of coolant in it. The oil would appear milky beige in color. This would indicate a leaking head gasket into the oil system.

2) Check for leaking coolant on the passenger side fire wall inside the vehicle. This would indicate a leaking heater core.

3) Check the exhaust when the car is running looking for white steam. This would indicate a leaking head gasket into a cylinder.

Nov 19, 2010 | 1998 Ford Taurus

1 Answer

98 pontiac firebird v6 3.8 liter, keeps overheating and i replace all cooling sytem parts.


When you said you replaced all the cooling system parts, you mean the raditor, the hoses, the water pump,the therostate, the raditor fan and it's relays and sensers. If you've done all of this and you correctly purged all the air out of the system then The engine can be making too much heat another way. The coolant temperture senser can say that the engine is cooler than it really is ( makes a rich mixture, to warm the engine) The therostate may be installed unside down or is open all the time or is missing. ( the therostate needs to make the car get up to 200degrees F or the raditior may not get hot enough to remove enough haet to cool the engine. ( hot is good too hot or too cold is bad). Let's say all the cooling system work is good and you did'nt mix more than one kind of antifrezze ( they jel up and not cool.) The exhaust can be stopped up ( causes low performance too) Take out the oxagen senser and connect a pressure gauge ( leave the snser plugged in and grounded) If the pressure goes any higher than 5 Lbs. reving it or anytime then you looking for a clog. A good system revved up and heald staedy should show a vacume. The timing can be wrong ( low performance too) The timing chain can skip time and the measureed compression will be lower that 150 LBS. With the chain skipped the ingtion timing will be slow and that will cause overheating all by it'self. The engine may need an oil change, Gas in the oil from short trips and running too cold sometime. Overheating will rurine the mototr oil and it being bad will make the engine heat. The engine turning hard ( turning the engine by hand you should feel 3 compression shrocks per turn and it should turn easy except as it pressureizes each cyclinder, ( they should all feel the same) the oil should look clear and black, not brown. If it's some other color, coolant may be getting in the oil, The exhaust should'nt smell sweet ( antifreeze leaking into the combustion ) with the car running and the cooling system full with the cap off it shouldn't bubble or steam come out ( it tells their is a leak in the engine to the coolant and it'll blow bubbles in the coolant and the hot exhaust will heat the coolant more than the raditor will remove. It certainly should'nt bubble at all started cold and full.

Sep 28, 2010 | 1998 Pontiac Firebird

1 Answer

1998 Chev 1500. 305 T.B.injection. Engine runs a little ruff when first started hot or cold but smooths out perfect after about 10 min of running. Check engine light on.


If you haven't already changed plugs and wires, do that first, but i suspect you have an intake gasket or a head gasket leaking. It runs rough when you start it because of coolant in the cylinder. After it clears out and dries, it will run fine. That would especially be the case if you have to add coolant occasionally.

Aug 15, 2010 | 1999 Chevrolet Silverado 1500

2 Answers

Coolant leak on a 1998 pontiac firebird v6


the water pump is directly above it

Sep 04, 2009 | 1994 Pontiac Firebird

1 Answer

1998 jeep cherokee classic smells like smoke when running


may be oil leaking and burning on manifold,could be small coolant leak but u would smell the coolant check valve covers maybe leakin,intake,breathers?????

Jun 21, 2009 | 1998 Jeep Cherokee

1 Answer

01 pontiac firebird losing coolant fast and white goo on oil cap


Head gasket, or intake manifold gasket is letting coolant leak by, into the engine.

Jun 09, 2009 | 2001 Pontiac Firebird

1 Answer

Leaking coolant


that would ba a big negative the only thing that runs inside that cover is oil now it could be either your water pump or thermostat housing if either one is near that cover the best thing to do is wash down the engine when its cold and once all clean run it and just sit and wait itll show up.. but to answer your question no.. no such thing as coolant in the timing cover

Feb 20, 2009 | 1998 Ford Ranger SuperCab

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