I have a K2500 GMC Sierra (1990). For a while I have smelled a burning antifreeze smell and recently antifreeze began to puddle under the truck while parked. It has 140,000 miles on the original 5.7L Chevy V8 engine. The antifreeze is running down the front of the block and seems to be puddling on the top of the engine near the driver side valve cover. What is wrong? Is it an intake manifold gasket? Is it a head gasket? How do I repair those? Also the oil is a milk chocolate brown color which makes me think there may be water in the oil. Thanks
2007-02-02 11:31:31 · 7 answers · asked by kuhntech 2 in Cars & Transportation ➔ Car Makes ➔ GMC
sound like your intake gasket is leaking , very common for GM 350cid . it's amazing that the gasket lasted 140,000 miles .
as for a fix. if your not comfortable with doing it yourself, take it to a qualified technician as the distributor can be tricky for someone who has limited experience .
of course don't forget to change the oil when done ...
2007-02-02 13:19:05 · answer #1 · answered by jesse 5 · 0⤊ 0⤋
i had this same problem with my 97 s10 with the 4.3 essentially the same motor with 2 missing cylinders. but is there a white fog coming out of the exhaust if so it's a head gasket if not it's an intake manifold which was the problem with mine. the milk in the oil is from water mixing with the oil it's a relatively easy thing to fix if you pick up an auto repair manual from somewhere like autozone. it only took me about 6 hours to tear everything off and replace. just besure when you remove the distributor you mark it very clearly so that it lines up when you install it. if not you'll have a hell of a time and you'll have to find top dead center on number 1 and then install the distributor so that it seats on the oil pump correctly. if it still doesnt run after you do that your distributor is in backwards or 180 out and youll have to rotate it until it is drops back down or about 180 degrees. Also besure to remove all old gasket material before applying new. should be bear metal. fill with water only to test for leaks for about a week if all checks out good then fush and fill with distilled water and antifreeze at a 60%antifreeze 40% distilled water.
2007-02-02 19:49:59 · answer #2 · answered by helrazr1586 2 · 0⤊ 0⤋
Sounds like you have an intake manifold gasket failure. If the oil is looking like milk chocolate stop driving it immediately. Need to remove the intake manifold & replace the gaskets. there are certain procedures & critical torque specifications so if you do not have the proper tools or manual do not attempt yourself. The oil will need to be changed after the repair & I would reccomend changing it again in a couple days. Antifreeze destroys the coating on the main & rod bearings which will lead to a blown engine. Hope you have not let it go too long like this. Good luck
2007-02-02 19:48:53 · answer #3 · answered by George 2 · 1⤊ 0⤋
Head Gaskett! the chocolate milk oil is the sure tell. The repair are extensive. call a pro.
2007-02-05 23:49:44 · answer #4 · answered by jason m 4 · 0⤊ 0⤋
head gasket or intake gasket if the oil milkey dont run the engin there is water in the oil and this could couse major problems
2007-02-02 22:34:58 · answer #5 · answered by stan s 2 · 0⤊ 0⤋
Most likely a head gasket.
You gettin' any white smoke from the exhaust?
You got any oil in the anti freeze?
Or anti freeze in the oil?
This is not recommended by the health board but pull the dipstick and put a little oil on your finger and touch it to your tongue - taste it.
If it's sweet, its mixed with anti freeze.
2007-02-02 19:39:42 · answer #6 · answered by Rainman 3 · 0⤊ 0⤋
sounds like maybe headgasket
2007-02-02 19:35:24 · answer #7 · answered by furmanator1957 4 · 0⤊ 0⤋