open the lid on that 7427 you bought and have a look

as a poor man i bought a cheap Chinese chip programmer
its tuned hundreds of chips now no problem
the sun can function as a free uv eraser in a pinch. it puts out tons of uv

tune your truck first

you should be able to open the ecm, pop the chip out, and put it in a chip reader if you wanted to pull the stock calibration off, then tune it with tunerpro, and write the...

oh and really old chips are this really cool thing called 'uv erase'
so if you have one of those chips you take the sticker off the 'uv window' and leave it hanging around on your window sill for a...

stop being sorry. i was in the place you are in once and so was everyone else here. that's why you're here.
burning a chip is super easy. you buy a prom programmer on ebay or whatever they are...

when i see leaks from a fresh engine on more than one surface it must be some fundamental issue

damaged or incorrect gasket(s)

mistorqued fasteners

machinist needs to be taken out back for...

if these are the parameters:

- throttle body type injection
- budget conscious
- good learning project
- fairly easy to tune
- guys on this forum help you

you want a modified OEM GM system...

you can adjust whatever you want. if you don't adjust the VE table or other airflow parameters what's going to happen is the ECM will just trim the fuel to be correct. edit: when i say correct, i...

let be frank even though my name is steve

don't be ridiculous.

stop saying "used to be" like someone can just up and lose a learned trade. that's not how it works

i know a bit about the...

that's really fresh oil, buddy. you must have pinched or damaged a gasket during installation, mistorqued something, missed some RTV'd corners that some GM gaskets require, or had mating surfaces...

welcome. i know both mercruisers and the 7747 moderately well, maybe i can help. TBI with stern drives was a really short lived thing, yours was factory TBI?

most old 160 baud slow ass old tbi ECMs (which are probably older than the original nintendo entertainment system and have about the same processing power) have a newer 8192 baud cousin that is quite...

it's weird for sure. i have like 1/100 users eventually report weird interface issues. maybe it's just a crap interface with a counterfeit chip dying or bad wiring in the car. i would consider...

and you're sure the correct com port is selected?

with the old slow ECMS i had usually run open loop, disable AE, lock down timing outside of operating range, and just do my best. results have been really good and 'better than a carb n points' but...

if your IAC is too slow, throttle follower doesn't fix it or settings not available, and you want your idle to drop quickly, you can play with your timing advance vs idle error settings or whatever...

no it can't be an offset issue

whoever told you that you cant run whatever lobe sep or lift or whatever cam you want just can't tune worth a crap.

the challenge is with EFI you have a CONTROL LOOP. this could be fuel or idle...

as a general rule on any car if the log data is clean when engine is off, but becomes corrupt with engine on,

- try running with alternator disconnected. if situation improves, replace alternator...

of course i am a seasoned programmer with experience in ELM and 8192 baud ALDL protocol stuff, not sure what your skill level is

oh it's totally possible to make such a thing
i would use something like a raspberry pi and some off the shelf hardware to make it easy
the raspberry pi would run linux or whatever and would...

oh and just cause an ECM is refurbished doesn't mean it isn't junk....

ensure your grounds are okay by running a jumper from ECM case to vehicle chassis.
if that's no good maybe your burned bin is bad with an incorrect checksum, improperly offset, improperly inserted,...

many gm dual injector tbi systems have two modes, one where both injectors fire in a pattern left and right, and one where both fire together. there is usually an rpm threshold for this so at higher...

nothin?
come on guys you are so loyal and you send me tons of money but you can't do a few flash reads for me when you're out there tinkering? ;)