Thread: Blew tops of pistons

Those afr numbers seem about right to me.

Gotta mess with the fuel trim though it's adding a lot of fuel. I would check for a vacuum leak.

Alright how exactly do i check it. The tester i got from the auto parts store was weird like outdated. I dont know which hose to connect it to.

30 cruise its 10.1 ltft 40 cruise its 7 the 16 is idle

Originally Posted by 01GrandPrixTURBOGT

30 cruise its 10.1 ltft 40 cruise its 7 the 16 is idle

Still a lot. You want to be as close to 0 as possible or at least under 5%.

You can use a hose and connect to the port on the lower intake beneath the snout for vacuum. Not sure what kind of tester you're talking about though.

Ok thanks

No not yet I just used my aeroforce intercepter. I want to get one I just got bills to pay.

Ok ill try clamping all my hoses. I can't believe the intake manifold would have a leak or throttle body I mean its been put together by my old tech teacher that built his own drag car.

Could an exhaust leak like where the front header connects to the crossover cause this? Also to do the fuel pump rewire do I have to drop the tank?

Yes and I think yes. Don't remember if your year has the access panel in the trunk.

With a leak at the manifold the o2 readings are incorrect so the computer won't add the proper amount of fuel. May run rich usually or even lean but either way it's wrong.

Ok ill have to get some clamps then. Man this is just driving me crazy, I wish I could just find the vacuum leak and be done.

So i sprayed some carb cleaner around on my hoses and didnt really notice any idle changes, kinda hard with just straight headers. But i got some more numbers. My MAF reads from .69-.70 my MAP reads 32-33 and my O2 reads 180-900 constantly changing. I still need to get clamps for my headers but the part store didnt have any.

Look at fuel trims while you spray. Thought I mentioned it before Sorry. If the leak is large You'll hear the idle change but small leaks are much more subtle. Watch your fuel trim before spraying...then while you spray it should start to go negative as its pulling fuel.

After all of this your engine is going to be so freaking clean LOL.

Ok ill have a friend watch next time I spray. A clean motor is a good thing lol. But hey do them numbers sound good.

Yeah they seem like good numbers to me. All normal idle numbers.

Thats good. I hope its just a vacuum leak then thats giving me all these problems

Also ive been hearing a lot about how 01s have more fuel issues. Whys that?

Ok I think I have a leak on my cyl 3 injector