i am going to buy a 91 rs camaro with a 305, it doesn't smoke at start-up but after it sets probably a minute it puts out blue smoke, i figure it probably has bad rings but, i have thought about putting some sea-foam or GM top-end cleaner or whatever it is in it. anyways they say it loses alot of power after driving a while, so i figure it might also need head gaskets, but i also have some other thoughts of why, anyways what all could it be?

 

It could be a number of things adding up to make it run bad. But overall it sounds like the motor could use a rebuild. I would stray away from this car. But if the price is right... Go for it!

 

your problem my set with the valves guide seals! if it was the rings then the motor would use oil!

 

sounds like you need a rebuild for sure. Do yourself a favor and walk away from that deal.

 

if its the valve guide seals, you would only need a minor head rebuild.

not to exspensive if the work is done itself

 

see, i don't know if it uses oil

 

the price is right, that is why i'm gonna get it

 

yeah. i can rebuild heads for the cost of parts

 

I hope it is free

 

some times after you rebuild the heads, its only worse because now youve boosted the compression up. if your going to pull the heads off, better be safe and go after those rings as well

 

How do you figure boosting compression translates to more oil burning?

 

Buy the car if you really want it.

Change the valve guide seals, that will most likely fix the oil burning problem.

The usual reason for "losing power" when the car heats up, is that the intake air temp sensor reports very hot air to the ECM, which then cuts back both fuel and timing. Simply relocating the IAT sensor often makes a DRASTIC difference to this behavior.

Don't worry about head gaskets, at least nothing you've said about the car so far, has ANYTHING WHATSOEVER to do with those being defective.

 

nope. it's not free, but lets just say i am sure i can get my money back out of it and some more pretty easy

 

how do you move the IAT sensor? rephrase that, where do i need to move it to?

 

if it only puffs blue for a couple seconds or so and thne is perfectly fine then really i would not evne worry about it, this is an extremely common occurance on highermileage engines, if you pay attention out in public watching older chevies being started up you will find that at least half of them do this, or more, nothing out of the ordinary unless its a documented lower miles vehicle taken VERY well care of,

cold air being sucked into the intake is the best for performance,

not hot

cold is more dense and holds more fuel charge

and there also happened to be more oxygen in the denser air- than equal volume of warmer air



basic physics

this is why dual snorkel air intake systems were made and ram air and so forth,


good luck