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Check compression, plug wire firing order and the injector wiring sequence at the ecm.

I was joking, of course it won't be perfect..

Wow I have the same L29 with comp xr-264hr-10 and 0411, and even have been using black bear. Assuming no mechanical problems like a wiped out cam (check your oil for metal), it has to be either fuel...

Thanks Fast. I do tow a trailer and in the AZ heat. The old black box in the 97 would kill power down to nothing in hot weather, like barely able to climb highway hills in second gear. My 1982 454...

Right, I know no one here can help until I get the hp myself. Yeah they glitch out, often right after a wot run. And it's right when spart timing drops to zero too, if there is any connection. I...

They are using efi live, and they loaned me a V2 data cable (with my cc of course). I email the logs and send the ecm up for adjustments. Here are a couple screenshots of the most recent tune. My...

Thanks fast4.7! I am making data logs and sending them to black bear. I tried to post pictures of the graphs but apparently the pic files were too big to upload. I can still upload the dot efi files,...

OK thanks, this is great info. The heads are ported and flow matched (295 cfm). I even flowed them with the manifold on. The chambers are unshrouded, polished, and cc matched (105 cc +- .2 after an...

K dooosh. Being a diik gets you nowhere. Maybe my 44 years of race engine building could have helped you with something.

In Joey Tribbiani voice, "How YOU doin?"

It's been a frustrating process sending it back and forth a million times, but I wasn't ready to take on tuning from scratch. Where do you recommend buying the HP from? Direct or an ebay seller with...

I finally made some data logs on the latest tune, including wide open. They did finally add wot timing alright, all the way from 22 to 34. Well 34 is too much. It was pinging and knock retard was...

I am recording and sending them log files.

I bought the 0411 on ebay and had them load it with a stock tune from a 2001 L31 350 van tune. That tune allegedly had only 16 deg at wot, and someone...

Ok what do I tell them to get what I want?

To recap, my 0411 ecm had been to Black Bear 3 times, once for an initial tune then twice more for adjustments. It had only 22 deg advance at wot the first time, still only 22 degrees after first...

I do plan to buy an HP setup and play with it til the cows come home. What is stock timing? Is it really that low? If so it must be related to emissions, maybe to reduce NOx.

I spent a year building a 7.4L vortec for my 97 K3500 dually. I worked on the heads for a couple months. I ported and cc matched the ports (flowed 295 cfm on intakes), chambers were cc matched and...

Ha wow a nice bump, ai spam or not! It took exactly 1 year to swap in the new engine, and it drove for the first time just last weekend! The heads finished up with 102cc chamber volume after...

I have a 97 K3500 with new, warmed up L29 454 with ported heads and intake, comp 212/218 at .050 cam, stainless headers, 5-0 racing 30lb Bosch injectors, 2001 0411 swap from an L31 5.7L 2500 van, and...

After 2 years of work, I have a new L29 in my 97 k3500. It has ported, milled, unshrouded and cc-matched heads (295 cfm intakes), ported manifold, 9.08:1 compression, Comp Cams 01-411 cam (212/218 at...

I get it now, thanks! 43 psi plus 15 inches vacuum is the same differential across the injector as say 50 psi and 2 inches of vacuum.

The fpr watches manifold vacuum, and raises fuel pressure at low manifold vacuum. I get that high vac means light throttle/cruise conditions, and low vacuum means more throttle, needing more fuel....

Ok thanks. There will probably still be a brake error light to deal with.

I'm in the process of swapping in a new L29 454 engine with ported heads, reground cam, Edelbrock pro-flow manifold, injectors, and throttle body, and making it work with a 0411, currently with an...

Right from HP? Or can I save any money buying from a vendor? I want to get the pro package too.

Ok how about these, 02-06 5.3l flex fuel, 36 lb/hr at 43.5psi, numbers 12580426 and 25326903. It's a common app so they are plentiful and cheap on ebay. And that era should mean the connectors still...