Hi
I have a Caprice modified as a impala ss clone with ls1 and 4l60e transmission. I have used the car winter and summer for 3 year with this combination. I am living in Norway, so winter means real winter with down below -30 degrees Celsius and a lot of snow. So drivability is an important issue.
I have felt that it is something odd with the way the engine act on full throttle all time. I have played with different os and different settings during this time without getting the problem solved.
The stock os is 344, but I have mostly used 156 and 074. I have tried auto ve and weatherman Shawn tutorial. My lc1 has showed values of 0.3 lower afr then the narrowband all time. Even, after I bought a brand new lc1. The ve table looks strange after my tuning attempts with al to low values in the full throttle part.
The engine has some annoying cold knock, and now I feel that it have a small leak in a head gasket also.
Because I use the car every day, and that the engine obviously needs a complete tear down, I now have a brand new ls3 gm performance parts crate engine in my garage. It may be a little overkill for my use but hopefully very fun.
My plans are to run this engine with the 2000 f-body computer and wiring harness.
The parts I have bought for the ls3 swap are:
19244097 gm performance parts crate engine
Lingenfelter TRG-002 58x to 24x conversion module
Racetronix RX-ls2-KSRH ls1 to ls2 knock sensor relocation harness
CE-109077 Injector Connector Conversion Adapter EV6 to EV1
Caspers 109103 ls1 ls3 map sensor adapter
Nick Williams 92mm cable throttle body
Harmonic balancer bolts
I have a big Corvette style aftermarket maf, and
A maf sensor adapter harness
Then some questions.
Should I buy two new o2 sensors for the engine to start with? The old switch ok but is it possible that it can be something wrong with them though.
The ls3 map needs different settings then the ls1, and they say that this can’t be done with the old 512 kb pcm, but under engine diagnostics I have found C6301 and C6302, map scaler and map offset. Can I put in the values from an ls3 tune here to adapt the ls3 map to the ls1 os?
What os is best suited for this application? I dream of an Edelbrock supercharger in the futures, but who knows. I suppose that all arguments to keep the stock 344 os go out with the old engine?
My pcm is a 09354896. Should I buy a 441 instead?