Hi all,
The car is a 2007 Grand Prix, with the 3800 N/A.
We bought it second hand in 2011 with about 57k kms, now it has about 102k kms.
I used to hear this a while ago, I think even the first winter when we had the car.
Let the car sit overnight, and start it and drive several minutes and at a light at idle, I'll hear three knocks from the engine bay.
Some of the work we did:
Change plugs and wires
Redid the LIM
Ran a few techron tank fuels,
Premium fuel.
Checked the heat shields, one of them is a little loose
PCV changed with new gasket, in 2011
MAF cleaned a few times
Coils checked resistance
I do have to monitor the oil level every month, sometimes need to add a little, a small cup.
After reading on forums, ran Auto RX in the winter time. from November to February.
I used to hear the knocks, but at some point hte first knock was louder then the second after were quieter. Then eventually I would stop hearing the knocks.
Currently been using PF47 Ac Delco filter, and Quaker State 5w30 oil.
It was suggested that maybe the piston crowns are dirty due to the short drives, about 2 miles to and back from work. I do try to try on the highway 20 minutes one way several times a week.
I bought MMO, and was about to put it in the crankcase, but didn't and returned it..
Afraid that it might cause more leaks... after reading a fair amount on forums etc... most favour mmo... but looking at how its a solvent I was afraid it would aggravate the Rear main leak that's been going on since we bought the car.
We usually change the oil every 4 months... or 3x a year... regular dino oil...
Should I run another dose of Auto RX, or the maintenance.. safe to use the MMO maybe a week before changing the oil?
With the job i have right now I can just about keep the operating costs of the car, as any compression test etc,,, wouldn't be done right away maybe soon...
Thank you
The car is a 2007 Grand Prix, with the 3800 N/A.
We bought it second hand in 2011 with about 57k kms, now it has about 102k kms.
I used to hear this a while ago, I think even the first winter when we had the car.
Let the car sit overnight, and start it and drive several minutes and at a light at idle, I'll hear three knocks from the engine bay.
Some of the work we did:
Change plugs and wires
Redid the LIM
Ran a few techron tank fuels,
Premium fuel.
Checked the heat shields, one of them is a little loose
PCV changed with new gasket, in 2011
MAF cleaned a few times
Coils checked resistance
I do have to monitor the oil level every month, sometimes need to add a little, a small cup.
After reading on forums, ran Auto RX in the winter time. from November to February.
I used to hear the knocks, but at some point hte first knock was louder then the second after were quieter. Then eventually I would stop hearing the knocks.
Currently been using PF47 Ac Delco filter, and Quaker State 5w30 oil.
It was suggested that maybe the piston crowns are dirty due to the short drives, about 2 miles to and back from work. I do try to try on the highway 20 minutes one way several times a week.
I bought MMO, and was about to put it in the crankcase, but didn't and returned it..
Afraid that it might cause more leaks... after reading a fair amount on forums etc... most favour mmo... but looking at how its a solvent I was afraid it would aggravate the Rear main leak that's been going on since we bought the car.
We usually change the oil every 4 months... or 3x a year... regular dino oil...
Should I run another dose of Auto RX, or the maintenance.. safe to use the MMO maybe a week before changing the oil?
With the job i have right now I can just about keep the operating costs of the car, as any compression test etc,,, wouldn't be done right away maybe soon...
Thank you