2018 lt1/8l90 swap

I need help lol, I'm swapping an LT1/8l90 out of a Camaro into my 70 C10. The engine is completely stock, I have swapped the intake manifold, to a LT2 intake, installed a swap cai and long tube headers. The car runs really rich. I'll be pulling the engine later for a cam and maybe supercharger down the road. I just want to tune it decently enough so that I can move it around the garage without fouling plugs.

Here's a log and the stock tune file which I only modified enough to get the engine to start.

Attachment 163207Attachment 163208

What makes you say the car runs very rich? Do you have a wideband on it?
It looks like the STFTs are doing their job and the O2s are oscillating so I would say it is seeing stoich at idle once the trims get everything in place.

Your O2 sensors (B1S1 and B2S1) are pegged high. Make sure you didn't hook up the front sensors to the rear o2 harnesses. I looked at the log from the time it went CL until it ends....about 2 minutes...and the 02 sensors oscillate ~10 times. The only way they do that is if they're hooked up wrong or your polling rate is so slow you're not catching the data.

It also shows a CL Fault which implies you have stored codes due to a fuel system issue.

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Originally Posted by RaceReadyTuning

What makes you say the car runs very rich? Do you have a wideband on it?
It looks like the STFTs are doing their job and the O2s are oscillating so I would say it is seeing stoich at idle once the trims get everything in place.

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I don't have a wideband but fuel was coming out of the exhaust and I have codes for bank 1 and 2 system too rich.

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Originally Posted by 96GS007

Your O2 sensors (B1S1 and B2S1) are pegged high. Make sure you didn't hook up the front sensors to the rear o2 harnesses. I looked at the log from the time it went CL until it ends....about 2 minutes...and the 02 sensors oscillate ~10 times. The only way they do that is if they're hooked up wrong or your polling rate is so slow you're not catching the data.

It also shows a CL Fault which implies you have stored codes due to a fuel system issue.

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I have two fuel system codes, one for the fuel economy mode switch and one for the fuel level sensor. I'll tune these out I don't see anything else.

I converted the harness to standalone and deleted the rear sensors. Is there a way to increase the polling rate?

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Originally Posted by [email protected]

I have two fuel system codes, one for the fuel economy mode switch and one for the fuel level sensor. I'll tune these out I don't see anything else.

I converted the harness to standalone and deleted the rear sensors. Is there a way to increase the polling rate?

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To increase the polling rate, in VCM Scanner (before you start a scan and you can't have a log open), right click on the various channels and you'll see "polling interval". From there you can pick the rate. I use 50ms for mine. Some guys use 100. If you're using a BT connection, the rate is so slow it's useless. Need to plug into the OBD port.

What color are the main harness o2 sensor connector bodies? On the C7 Corvettes they're black. I'd expect the Camaro harness to be the same. Rear sensors use a gray connector.

Assuming the sensors are hooked up correctly, I'll wager you have a mechanical issue....bad injector(s) would be my guess. The engine should run fine on the stock tune. Headers, CAI, and the intake aren't that much of a change. It won't be optimized for power and the rear o2s need to be tuned out, but it'll run fine and certainly not have fuel dripping out the tailpipe.

I wouldn't run it until you check the injectors or you'll wash down the cylinder walls.

Do you have the stock tune to start fresh from? After checking injectors, I'd start from the ground up, initially addressing the rear o2s and DOD.

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Originally Posted by 96GS007

Do you have the stock tune to start fresh from? After checking injectors, I'd start from the ground up, initially addressing the rear o2s and DOD.

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Yes I still have the stock tune, the tune that I have now is still the stock tune, with vats, dod, the rear o2 and other emissions related codes removed.

I do not have rear 02s, they have been removed from my harness. The engine is not dripping fuel out the exhaust now, but it was on the initial start up. I have some more dtcs that I need to tune out, my biggest concern was that the engine was running properly since I converted the harness to stand alone myself

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Originally Posted by [email protected]

Yes I still have the stock tune, the tune that I have now is still the stock tune, with vats, dod, the rear o2 and other emissions related codes removed.

I do not have rear 02s, they have been removed from my harness. The engine is not dripping fuel out the exhaust now, but it was on the initial start up. I have some more dtcs that I need to tune out, my biggest concern was that the engine was running properly since I converted the harness to stand alone myself

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You're missing my point. I've seen more than 1 person think they removed the aft o2 sensor wiring from a harness.....but in reality they removed the wiring for the front o2 sensors. They then plugged the front o2 sensors into the wiring that's left....except that wiring feeds the rear sensor data to the PCM. The only way to tell them apart is by connector color....black for the front, gray for the rear.....at least on the Corvettes and likely on the Camaro. If you still have gray connectors (harness side), those were for the aft o2s. If not....:cheers:

Stock tunes don't go hard rich and even only initially drip raw fuel out of the exhaust on a basically stock engine. You have a mechanical issue and/or a wiring issue, not a tune issue.

The connectors are black and I will test for continuity at the pcm connector to make sure that they are the front sensors.