Question about 2001 Pontiac Grand Am SE

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Service engine soon light keeps coming on. Now low coolant light

In 2007 I had antifreeze leak so dealership lower intake manifold leaking antifreeze. Reservoir cap not holding pressure. replaces gasket, repleaced water pump, replaced reservoir cap, replaced belt, cam shart sensor cracked while making repairs, replaced cam shaft sensor to the tune of 1222.77 with labor. then engine light came on in early 2008 a few different times. PO300 always, cylinder #2 misfire, R @ R plug ok, coil OK. cleaned plug. 7-08 SES light on again. #2 cylinder misfire again. cleaned fuel injectors, replaced the plugs, washed car for me at no charge. 5-08 SES light on. #2 again. replaced coils, plug wires and O2 sensor, fuel filter for $892. Back several times since SES light comes on, more spark plugs, in 8-08 #2 cylendar again. Told I didn't need new coils so gave me back $700 now tells me it is my intake manifold gasket and need to fix for $1500. Brought it somewhere else that said he put tons of pressure with no leak so that isn't it. He replaced my antifreeze resevoir and had it 6 weeks driving with a computer in the car. # cylindars at random misfire with no ryhme or reason. Mostly Auto zone code is for #2. I have been adding coolant. SES light stays off mostly now. Add coolant is on and off, car hesitates. only has 67,000 1999 so I want to fix my car. Am frustrated. Everyone seems to scratch their head and say "I am stumped!" Can anyone help me????

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  • bthwgs Feb 18, 2009

    Thanks for getting back to me. I don't think it is a combustion issue as there is no backfires and my antifreeze is definately going somewhere. In the run off hose there is a bolt in it??? I am not convinced it has to do with my exhaust but please keep brainstroming.

  • bthwgs Apr 04, 2009

    There is a wealth of knowledge to absorb here. I think they are very good points. Ones definately to explore. Thanks more than you know. FYI, took the bolt off of the resevoir hose. Still rough initially when started but after a minute or two it runs better. I can smell antifreeze however, the SES light has not come on anymore. Don't think the problem is solved but I am definately going to look into the new found info. Thanks!!!

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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

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Hey it sounds like your cadilac converter just take it to your muffler shop and a new one should run 199-300$. I just had one replaced in my grandam and it took the check engine light off.

Posted on Feb 17, 2009

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