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? ;)

do send a datalog but you have replaced a lot of parts.

that is really damn frustrating

have reviewed your list of stuff you've done and determined that it's likely that one of your...

if your only goal is to delete the EGR, sending the chip to someone for a quicky EGR delete is definitely a good option

people on this forum tune themselves but for such a simple change that time...

these statements apply to any ecm not yours specifically

the iac doesn't have anything directly to do with idle mixture. it uses it to control idle speed instead of moving the throttle plate like...

usually obdxpro VT, what kind of car are you trying to tune?

hey all

i have recieved random reports about flash read not working in flashhack

thing is i dont have a test bench set up and am lazy and i dont remember what i've done to fix it

there is a...

with a speed density ecm you have a map that describes load vs rpm vs airflow for your particular engine

that changes when anything regarding airflow changes

that's definitely the first thing...

assuming you still have the original ECM for the truck?

a 1993 engine like that shouldn't have ever had a post cat o2 sensor so that's nothing to do with it

the lack of an EGR could cause a bit...

glad you beat it
its definitely something ive done before

no even a massive vac leak will not cause a fire. a fire in your throttle body could only be a severely leaking injector (unlikely) or a timing or valvetrain issue. is it possible that while...

a weak coil will sometimes have enough output to jump one gap but fail to jump the second one. takes quite a big spark to jump the distributor and the spark plug. seen it a few times.

to give you an idea how it works, your pump doesn't create pressure, it just moves the fluid. to create pressure in a pipe you need to restrict the flow. so the regulator creates a restriction until...

assuming no restrictions or clogs your fuel pressure measured anywhere before your regulator will be regulated by the regulator

its possible to get a pump much larger than original and outflow the...

fuel starvation in vehicles with extreme angles is a very interesting problem with lots of neat solutions

my jeep wj has a pump that lives in a bucket in the tank, just like most GMs, uses a...