Question about 2001 Pontiac Montana
What could be wrong?? could my head gasket be gone or what?? and also i have some back firing sometimes. I have replaced my spark plugs, and wires only about 20,000km on them but i did not replace the coils. And the temperature gage goes up and down.
You have bad head gaskets and possibly a cracked head or heads.
not uncommon with the Montana
Posted on Oct 13, 2012
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Posted on Jan 02, 2017
I would start by doing an oil change myself so you can examine the oil and look for water/antifreeze in it. You will be able to see it separate from the oil and you can smell the antifreeze. If there is then you have a leak between the water jacket and the heads somewhere. More than likely the LOWER intake gasket is leaking into the head. You said they replaced a gasket but was it the UPPER or LOWER? If it was the LOWER did they use RTV in the correct areas? Did they torque the intake bolts to the correct pressure and install the bolts correctly? I know you don't have these answers but these could all be part of the problem. It may be leaking more at #2 cylinder and causing it to foul more than the others. Also just because a mech pressurized the coolant system and didnt see any change in pressure (hopefully he wasn't just looking for visible leaks) the issue may not happen until the engine is hot, as metals behave differently when heated, especially aluminum which the LOWER intake is made. Have a mechanic or mechanically inclined friend (gearhead) remove the #2 plug wire, then kick the engine a few times without starting it, enough to let any fluid get into the chamber, this would include gas btw. Then remove the plug and look for any wet residue on the plug, gas will evap. quickly, antifreeze/oil won't. again try to smell the residue and if necessary, lightly touch some to your tongue, antifreeze has a sugary sweet taste that is easily detectable. Remember any time you are working with chemicals such as waste oil and especially anti freeze, minimize spills and clean them up quickly and completely and place the spent fluid in a sealable container and take them to a collection center for disposal. Waste oil is a carcinagin (cancer causing) agent and antifreeze (glycol) new or old will kill any animal (child, dog, cat,etc) that ingests it. Many auto parts stores and some other retailers that sell oil and antifreeze will take your wastes if you bought the replacement fluid from them, check before you buy.
Posted on Apr 04, 2009
what light is flashing with this Service Vehicle Soon message? (Mine had the high beam light flashing and it turned out to be a head light.)
Posted on Nov 14, 2008
ok, its time for a radiator flush. there is major sludge in the internals of this radiator. Make sure the thermostat is in the correct position as well. I've seen many cars come into my shop with the thermostat inserted backwards.
Posted on Mar 13, 2009
There will be marks on the cam gear and the crank gear. Some are dots, some are diamond shaped. You just line the two up so the top mark is directly over mark on the crank. You may have to turn the crank by hand which is easier with all the plugs out, to line it up. You will want to drain oil,change filter, and put in new oil to get rid of contaminated oil in oilpan.
If you fail, you are not talking about a lot of money to try to fix the top of the engine compared to engine replacement. For the most part, you could still tow it.
You could ask how much it would cost just to replace the gasket and let someone else bust their knuckles.
Posted on Apr 26, 2009
You are correct in your idea about how the plug wires are attached. If you want to duplicate control wiring you would need to obtain the wiring diagram of the brand of ignition system you want to duplicate. (MSD etc. These systems also require a small battery in order for them to operate. Wiring to distributor was far less complex when vertex type magneto distributors sere used as all that was required was a ground wire to shut them down (exactly like your lawnmower works), As far as plumbing, all systems need to meet safety standards set forth by the NHRA but aside from meeting those standards, each engine builder decides where to locate such items as primary and secondary fuel injectors etc. If you go to the NHRA website, you may be able to find a decent photo of someones engine...that may be helpful. Also check the rule book for such items as kill switch location, brake, chute release etc.
Posted on Sep 13, 2009
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