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????
Re: service engine soon light keeps coming on. Now low...
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.
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See my answer to your related/same question which I include again for your reference:
You must immediately check your engine oil level and take appropriate action: unless you have a defective oil pressure sensor, oil pressure light usually indicates that your engine oil is not flowing properly. Some possible issues: low oil level (leaking engine?), blocked oil filter (when did you last get your car service) or defective or blocked oil pump due to excessive dirty engine oil.
Also check under your car to see if you have any oil leaks: this usually indicate that you have defective engine gaskets or oil seals causing your oil (pressure) warning light to come on.
Hope it is of assistance. But I would consult a motor mechanic asap as you engine could soon fail due to the lack adequate oil lubrication.
If the lower (intake) manifold is leaking, which is very common, then you should either have an external antifreeze leak, or antifreeze into the oil. Oil will not go into the antifreeze. The coolant used in this car (DexCool) does, however, form an oily substance on the surface over time. I would recommend having the antifreeze flushed out, and the reservoir cleaned.
Check you oil for signs of coolant contamination. If coolant is present in the oil, you may have a leaking head gasket or intake manifold gasket. If there is no sign of coolant in the oil, the antifreeze could be leaking past the intake gaskets and into the combustion chamber. It could also be a leak that only shows up when the engine is running, and you are losing the coolant as you drive. This kind of leak is very difficult to locate. You will have to look for signs of antifreeze around the upper and lower intake gasket area with a strong flashlight. Also check for signs of leakage at the upper and lower radiator hose connections and the drain valve at the bottom of the radiator. If you smell antifreeze inside the car, check the carpet for dampness caused by a heater core leak. Sounds like a lot of work, but these mystery leaks as I like to call them, can take repeated inspections before you finally locate them. I hope I have been of some help. Good luck and let me know what you find.
Late model GM cars are plagued with antifreeze leaks around the Upper Air Plenum gasket and also the Lower Intake Manifold gasket. This is brought on by Dex-cool antifreeze deteriorating the gasket materials. If the Lower Intake gasket is leaking, it may have contaminated your loil with antifreeze. If there is antifreeze in the oil it should show up on the dipstick as a gummy sludge. GM has issued Technical Service Bulletins to their dealerships concerning this issue. Check with your local dealership to see if they will repair it at no charge. There currently is no recall, so they probably won't. In that case, take it to a good garage and have it repaired. Don't wait too long. If the oil is contaminated, it will damage your engine from lack of lubrication.
Get that fixed ASAP, Water in the oil will destroy the bearings. The intake manifold gaskets may be bad, leaking water into the engine. Have a repair shop check it out and recommend repairs. Do not put this off, unless you want a new car.
It may be the intake manifold gasket that has gone bad and you may be losing the antifreeze in your engine. Pull the oil dip stick out and see if it' over filled and look under the oil cap, look to see if there is any sign of antifreeze in your engine oil. Under the cap would have a milky brown sludge and under the PVC valve too, if there is then your engine is on it's way out if you do not repair the leak. Antifreeze is corrosive to the engine bearings and it's been know that as low as 1000 miles will cause the engine to go bad with antifreeze in the engine. The intake manifold gasket is known to go bad in the 3.4 liter engines till 2004 where they came up with an upgraded gasket. Good luck and keep me posted.
Usually intake has to do with the induction system, as in intake manifold , The intake manifold can have several types of leaks, the intake can have a vacuum leak, oil leak, coolant leak or a combination of any of the before mentioned....hope this helps,