305 with electronic fuel injection. It seems like there is no leak in the radiator. Oil color seems ok. Has not been changed in over six months. When I accelerate, the engine seems to bog down a little, like it is not firing properly. I dont hear misfires. Gas has been changed.
2007-03-27 14:44:22 · 10 answers · asked by Anonymous in Cars & Transportation ➔ Car Makes ➔ GMC
Your truck probobly has a blown head gasket.
2007-03-27 14:50:28 · answer #1 · answered by z 2 · 1⤊ 0⤋
Well dang the oil is supposed to be changed every 3000 miles or 3 months, before you go assuming the worst I'd be for starting the truck on some scheduled maintenance first, probably it's a very light blue smoke which would be the first indication that if you don't start soon you'll end up replacing the whole engine, so change the oil and filter now and take it from there. And if you even think you might be resuming this type of maintenance, consider a synthetic oil like mobil 1 OR do them on a regular schedule (every 3k / 3 months, whichever comes first).
2007-03-27 23:08:10 · answer #2 · answered by netthiefx 5 · 0⤊ 1⤋
If I was to guess...Sounds like a blown head gasket...Or cracked head.... Have you overheated it recently? Check your Radiator coolant system... Any kind of oil in your radiator fluid is usually a sign of a blown head gasket... I would recommend getting a compression check done on each cylinder of the motor... That will usually tell you right away if you got a leaking head gasket... They sell kits to do it yourself but it's time consuming and involves an extra person to help you... Or you could spend the money at a repair shop... Hope this helped...
2007-03-27 21:55:02 · answer #3 · answered by m0nig86chevy 2 · 0⤊ 0⤋
I have read your question and all your replies to date and agree that the first thing you should do is change the oil and get a tune up While you are at the auto parts store pick up a manual on your vehicle it will have a trouble shooting guide in it as well as picture of used plugs witch will tell you allot about the condition of your engine. also this manual will give you the correct procedure for a compression check.
2007-03-28 05:51:56 · answer #4 · answered by J L 2 · 0⤊ 0⤋
possible head gasket. Not every blown head gasket loses noticible coolant nor does every one show fluid in the oil(depends on which area is blown) check spark plugs to see if any have a white residue on them. if white on them then probable head gasket problem, which would also explain the bogging down and not firinf smoothly
2007-03-27 21:53:06 · answer #5 · answered by manictinman 1 · 0⤊ 0⤋
sounds like a headgasket but i wouldnt rule out valve seals my 92 chevy did the exact same thing changed valve seals my power came back and the smoke was gone.
2007-03-29 09:57:51 · answer #6 · answered by rswim_99 1 · 0⤊ 0⤋
YOU MIGHT HAVE BLOWN A HEAD GASKET, BUT I HAVE SEEN A BAD PLUG, OR A BAD PLUG WIRE DO THE SAME THING. tHE ONLY OTHER THING THAT I HAVE SEEN TO BLOW WHITE SMOKE IS WATER IN YOUR GAS. yOU COULD USE SOME GAS TREATMENT TO DRY IT UP. aLSO CHECK YOUR FUEL FILTER. I HOPE IT'S NOT YOUR HEAD GASKET. GOOD LUCK.
2007-03-27 21:56:46 · answer #7 · answered by out for justice. 5 · 0⤊ 0⤋
hi, could it be gray and not white smoke? if confirmed gray, you are not burning clean, try a tune up, replace plugs, cap, rotor, wires and a new EGR valve. use carb cleaner to wipe clean egr breathing holes... if this wont fix it, you are burning oil,, which could be valve seals or rings... good luck.
2007-03-28 01:04:05 · answer #8 · answered by charlie 5 · 0⤊ 0⤋
i think the block is cracked and it is leaking in and when it fires it burns it.
2007-03-31 21:51:12 · answer #9 · answered by bob t 1 · 0⤊ 0⤋
could be a burnt valve.
2007-03-27 21:54:08 · answer #10 · answered by whiteman 5 · 0⤊ 1⤋