RIP Cobalt...
#26
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Sorry I have to call BS. fuel trims on a properly dialed in MAF will not be off that much from summer to winter. My car is normally within 2-3% from 20* to 100*. These cars do not need retunes every time the weather changes that is why we have 2 maps, a MAF and a closed loop PE that corrects. These are not carburated cars.
#27
Senior Member
Not entirely true.My buddys Turbo 2.2 I put together blew a chunk out of #4 and did no damage to the sleeve what so ever.The chunk of piston actually went through the exhaust valve and out through the turbo lol.He just put new rod,pistons,head gasket,and head studs while he was in there.The only way to find out is pull it apart or put a scope in it through the spark plug hole.
#30
alright i have a friend with a nice shop that will let me use his tools.
can you replace pistons on an lnf without dropping the motor? on the all-data it instructs you to but i heard other people doing it in the bay. also tools other than basic hand tools to do this?
hopefully only the piston is damage and not much to the sleeve so i can just hone it and drop in new ones. prob going with these: K635M86 Wiseco Turbo Pistons Solstice Sky Redline LNF on eBay!
can you replace pistons on an lnf without dropping the motor? on the all-data it instructs you to but i heard other people doing it in the bay. also tools other than basic hand tools to do this?
hopefully only the piston is damage and not much to the sleeve so i can just hone it and drop in new ones. prob going with these: K635M86 Wiseco Turbo Pistons Solstice Sky Redline LNF on eBay!
#31
Senior Member
alright i have a friend with a nice shop that will let me use his tools.
can you replace pistons on an lnf without dropping the motor? on the all-data it instructs you to but i heard other people doing it in the bay. also tools other than basic hand tools to do this?
hopefully only the piston is damage and not much to the sleeve so i can just hone it and drop in new ones. prob going with these: K635M86 Wiseco Turbo Pistons Solstice Sky Redline LNF on eBay!
can you replace pistons on an lnf without dropping the motor? on the all-data it instructs you to but i heard other people doing it in the bay. also tools other than basic hand tools to do this?
hopefully only the piston is damage and not much to the sleeve so i can just hone it and drop in new ones. prob going with these: K635M86 Wiseco Turbo Pistons Solstice Sky Redline LNF on eBay!
#37
Senior Member
The cylinders definately need to be rehoned. There are 4 big bolts as well as the struts that have to be dropped to drop the motor and trans.
#38
Senior Member
I havent retuned my car sice it was originally tuned and ive been throug 2 winters so far. This will be year 2.5 on the tune and i havent had any issues. Guess i had a good tuner
#39
what is the cylinder ridge im reading about on all-data? they say it must be reamed out to get the piston out?
also do you guys know any service manuals i can buy for this or should it be pretty self-explanatory? im not very technical savvy myself but i have two friends that are going to help me that have rebuilt numerous motors.
i know im going to have to hone all four cylinders, should i get the 86.5 mm pistons instead then? (stock is 86mm) or would i be fine just dropping in stock spec?
also do you guys know any service manuals i can buy for this or should it be pretty self-explanatory? im not very technical savvy myself but i have two friends that are going to help me that have rebuilt numerous motors.
i know im going to have to hone all four cylinders, should i get the 86.5 mm pistons instead then? (stock is 86mm) or would i be fine just dropping in stock spec?
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