New guy with a Fitech 70051
So I spoke with Fitech support on the phone and got some answers. Im still unsure about the alternator but I think Im good to run without the two wires from the original alternator plug, and simply run the "bat" wire from the new alternator to the battery and then on to the power distribution block. Im still slightly concerned that the correct voltage will be sent to my dash/gauge cluster but wont know until its all hooked up. Ill report back. As for the stock volts gauge on the dashboard, apparently this gets its information from the gauge cluster so in theory it will work, so long as the correct voltage goes to the cluster without the wires from the original alternator.
As for my other questions
- They said not to tap the CTS wires to try to run the stock water temp gauge. Not because it necessarily wont work but because it might interfere with the signal to the Fitech ECU.
- They said I dont need to hook up the VSS plug(or either auto trans control plugs obviously) and it wont interfere with deceleration fuel parameters as long as the yellow brake wire gets hooked up. It is my understanding that hooking up the yellow wire is still "optional" even without the VSS hooked up.
So Ive gotten my truck running but I have some issues Im working through. Setup is Corvette filter/regulator, PTFE lines, 44lb injectors, billet rails, sheetmetal intake. Im getting large amounts of fuel vapor in the intake after I shut off the engine. It idles fine. It starts fine hot and cold. It does not like to run above 3000rpms. It has not been tuned, only given the initial setup parameters to get it running. Im guessing I have a leaking injector, they are brand new Deatschworks. Anybody see this amount of vapor in the intake before? Ill try to upload a short video.
I've got more than that when I shut down warm. I have to open the butterfies and blow in the throttlebody to keep it from backfiring when I start it. Like a heavy smoker is blowing smoke out of the throttle body. It doesn't seem right, but I have the exact same situation. My AFR's are set no higher than 14.7. I've fouled out a second set of plugs now, no exhaust leaks I can find. Let me know if you figure it out!
Hey Mike, I'm just getting caught up here. All is well?
Quote from 7.4 4x4 on March 22, 2024, 4:57 pmI've got more than that when I shut down warm. I have to open the butterfies and blow in the throttlebody to keep it from backfiring when I start it. Like a heavy smoker is blowing smoke out of the throttle body. It doesn't seem right, but I have the exact same situation. My AFR's are set no higher than 14.7. I've fouled out a second set of plugs now, no exhaust leaks I can find. Let me know if you figure it out!
Damn, thats more smoke than mine. Im only getting backfires when I try to drive the truck and actually give it gas to accelerate, not at idle or hot/cold startup. I also dont have any exhaust leaks(since fixing them all haha) and all seems well otherwise.
Quote from Paul Bell on March 28, 2024, 6:10 pmHey Mike, I'm just getting caught up here. All is well?
Hi Paul thanks for checking in. Apologies for the brain dump that is about to happen here! Im still running super rich. I can get the truck to start and idle but it doesnt want to drive. Just taking it around the block for half a mile results in my cat getting so hot its glowing orange by the time I get back to the garage. My AFR at idle will hold a decent number 13.5-14.5 to 1 but when I hold the throttle steady above ~2000rpm its fattens up to like 10-1. Ill be honest and say I have no idea how to tune with the handheld. Ive read some tutorials and watched videos of people with fitech setups but I cant seem to make any noticeable changes. Ive got P0204 and P0208 codes which point to faulty injectors which I have been suspecting. It would be a shame if 2 of 8 brand new injectors are bad. Only thing I havent tried yet is testing fuel pressure. Im running a corvette filter/regulator which I understand is supposed to flow 60psi which is a little more than the 58 this system wants. Is that enough to cause these issues?