I was driving my 99 v6 firebird on the highway when it started to lose power. Since my exhaust is loud I had the radio turned up so I didn't hear the rapid knocking noise until I turned it down. Then the engine stalled right after. I was on the highway a good 15 miles before this happened, hopefully I didn't kill it. The power seemed fine before this. I noticed the oil pressure gauge much lower than usual before it did stall. Now it won't even crank. The oil level is fine, only slightly over the full mark. Last month I had the following replaced: ICM & coils, intake gasket set, valve cover gaskets, water pump, thermostat & tensioner pulley, coolant & oil change. Other things of note: The battery was also low right after the stall, the alternator tested fine at auto zone. The compressor leaks but I haven't bothered to replace it. The other belt accessories turn freely by hand. Not sure if any of this helps, just thought I'd throw it out there.
Well CB....a knocking noise coming from the engine is never good news.
Typically any real ugly noise that stops an engine from running is catastrophic. With the info you provided...low oil pressure, excess oil in the pan, knocking engine sounds and a motor that will now, not turn over...sounds like a bent con rod caused by a failed main bearing.
The engine overheated so the first suspect is the cooling system, some engine designs require that the thermostat be installed with the vent or bypass hole in a certain position. Failure to position the thermostat properly can cause engine overheating.
Another cause of the dreaded knock is "Knocking and pinging" caused by a low fuel octane rating, carbon deposits on cylinder walls or incorrect spark plugs... all not good. I think you would have noticed if your motor was knocking and pinging for any extended period of time.
Excess oil in the pan gets frothed up by the crankshaft slapping it around and aerates the oil which decreases its shear strength, which is what keeps metal parts from contacting directly together.
This could ruin the main crankshaft bearings.
First thing I would do is remove all the spark plugs (to reduce engine compression) and place a socket on the crank pulley bolt and try to turn the engine over...you should be able to spin the crank....if you can't get the motor spinning..it's seized up.
Good luck !
SOURCE: 1999 Grand Prix GPS Surpercharge
If they promised to fix it and did not go to oberdsman. trading standards its called in England. they can make them do the job right over hear. have you got the same thing for shoppers over there. selling a product that does not work.
SOURCE: Valve cover gasket
valve cover gaskets are in expensive, like 20 bucks, a books that can tell you how to do it would be 25-50 and you will be able to use the book for other things.. there are usually a few long bolts going straight through your valve cover, jus take them off remove the old gasket and put new one in put them back in.. however tightening the valve cover bolts will be the only tricky part.. you may need a torque wrench and have to refer to the book to know exatly how tight they should be.. but as a rule of thumb 80-90 ft-lb of tork is usually used.. be careful when doing this cuz if you put the wrong torque on it will bend your valve covers or posibbly not seal correctly
SOURCE: 99 Grand Prix, 3800 vin K, 283, 000 miles. No MIL,
How old are the spark plugs and wires. GM vehicles are great runners until something goes wrong with the typical spark or fuel delivery issues. Wires or fouled plugs may not set off the computer, it will just run crappy.
SOURCE: I have a leak that
Please do try this steps:
Please check it first to avoid a lot cost of money. If you have additional questions feel free to reply to this solution. Have a nice day.
I’m happy to assist further over the phone at https://www.6ya.com/expert/ramy_d9e7ebea3891f482
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