1992 corvette runs like crap

[Grumpy]

bought a 92 that ran pretty good but was getting a 64 code. I bought a aldl datamaster cable to see what was going on. Big mistake. I hooked it up and started eng. brother was helping me cause I dont know much about computers. he moved pin position on end of cable, the engine died and end of ECM. no start. bought a service manual and tried everything I knew. sent the box off and they called back and said unrepairable. bought a box from Cardone still, wouldn't start. bought an opti on line and it starts but wont idle, backfires out the plenum, to keep it running you have to rev it between half throttle and floor. It sounds like a BAD vaccum leak but there isn't any. if it had a dist. and carb. no prob. this is like learnin Chinese. fuel press is good. hope someones has some ideas. thanks a lot.

https://appcar-diagfca.com/en/supported-vehicles/

http://garage.grumpysperformance.com/index.php?threads/wheel-hub-replaced.14766/

http://garage.grumpysperformance.com/index.php?threads/c4-c5-corvette-trouble-codes.2697/

http://www.chevythunder.com/fuel injection elect. pg B.htm

http://garage.grumpysperformance.co...ittent-cylinder-miss-problem.9478/#post-34812
https://www.summitracing.com/parts/anm-cp7838

and rev the engine a few times and watch the fuel pressure it should in theory remain in the 38 psi-42 psi range for most TPI and TUNED PORT efi
READ THROUGH THE LINK ABOVE AND BELOW AND DON,T SKIP THE SUB LINKS
a code 64 indicates an oxygen sensor sees its running lean, you obviously have other issues also

you really need a old computer, an ADL cable and software to read the info and of course a shop manual for YOUR YEAR CORVETTE, and a MULTI METER
reading links may seem like a waste of time , but having a shop manual, a decent up-to-date, scan tool and a multi meter and a good understanding of what your testing and why your testing it helps a great deal
like the old saying how do you eat an elephant ?......one little bite at a time!

all the answers are readily available, theres known testing procedures and listed test results you can expect, and procedures listed in the shop manual for isolating and testing components, you don,t need to be a genius, you just need to be logical and persistent and not afraid to learn new things while getting your hands dirty at times, don,t get overwhelmed , break everything down too easy individual problems and tests, verify and test all the sensors,and test for factors like consistent fuel pressure, known temps,expected voltage or ohms resistance, and vacuum readings and don,t randomly start replacing parts as that gets expensive and its rarely the most efficient way to eliminate problems(unless you get really lucky) with modern computer diagnostic software you,ll have some advantages but think logically, most automotive problems still concern, compression, fuel delivery ,fuel pressure, vacuum, temperature or electrical issues.
and posting clear pictures of each spark plug labeled as to its cylinder number,
doing a vacuum leak test,do a fuel rail pressure test
do a compression test getting the compression number from each cylinder
check voltage on the coil input lead and alternator
http://www.helminc.com/helm

https://www.harborfreight.com/catalogsearch/result/index/?dir=asc&order=EAScore,f,EAFeatured+Weight,f,Sale+Rank,f&q=zr13

if you purchase a ZR13 auto code scanner, from HF,
you need this info
DOWN-LOAD AND PRINT IT OUT!
https://manuals.harborfreight.com/manuals/63000-63999/Q63806.pdf

https://manuals.harborfreight.com/manuals/63000-63999/63806.pdf

Measured Value
Engine Coolant Temperature Sensor. 185 Ohms @ 210F, 3400 Ohms @ 68F, 7,500 Ohms @ 39 F.
Engine Oil Temperature Sensor. 185 Ohms @ 210 F, 3400 Ohms @ 68 F, 7,500 Ohms @39 F.
Oil Pressure Sender/Switch. 1 Ohms @ 0 PSI, 43 Ohms @ 30 PSI, 86 Ohms @ 60 PSI.
Fuel Quantity Sender. 0 Ohms @ Empty, 45 Ohms @ 1/2 Full, 90 Ohms @ Full.
MAT (Manifold Absolute Temperature Sensor). 185 Ohms @ 210 F, 3400 Ohms @ 70 F, 15,000 Ohms @ 40 F.
Outside Temperature Sensor. 4400 Ohms @ 60 F, 2200 Ohms @ 85 F.
In Car Temp Temperature Sensor. 4400 Ohms @ 60 F, 2200 Ohms @ 85 F.
MAF (Mass Air Flow) Sensor. .4 Volts @ idle, 5 Volts @ Full Throttle.
Oxygen (O2) Sensor. .1 Volt Lean Mixture, .9 Volt Rich Mixture.
TPS (Throttle Position Sensor). .54 Volts Idle, ~ 5 Volts Full Throttle.

Sensor Locations

Sensor


Location
Engine Coolant Temperature Sensor. Front of engine, below Throttle Body.
Engine Oil Temperature Sensor. Left rear of engine, just above the oil filter.
Oil Pressure Sender/Switch. Top, left hand rear of engine.
Fuel Quantity Sender. Top of fuel tank, beneath filler pipe escutcheon panel.
MAT (Manifold Absolute Temperature Sensor). Underside of manifold air plenum at rear.
Outside Temperature Sensor. Right side of engine, top right corner of radiator.
In Car Temp Temperature Sensor. Coupe: above left seat near interior courtesy light, Convertible: center of cargo compartment lid.
MAF (Mass Air Flow) Sensor. Front of engine ahead of throttle body.
Oxygen (O2) Sensor. Left side of engine, in exhaust pipe.
TPS (Throttle Position Sensor). Right side of throttle body at the front.

in the ideal exhaust system youll want to have less than .5
(thats 1/2 a PSI of back pressure) at the engines peak rpm

http://www.exhaustvideos.com/faq/how-to-calculate-muffler-size-pipe-diameter/

http://www.mk5cortinaestate.co.uk/calculator5.php

3" o.d = 2.87" diam. inside--approximately 6.5 sq inches of area
2.75 o.d = 2.62"diam. inside--approximately 5.4 sq inches of area
2.5 o.d = 2.37" diam. inside--approximately 4.4 sq inches of area
2.25 o.d = 2.12" diam. inside--approximately 3.5 sq inches of area

well worth reading

http://www.popularhotrodding.com/engine ... ndex1.html

http://garage.grumpysperformance.com/index.php?threads/exhaust-components.361/

http://garage.grumpysperformance.com/index.php?threads/calculating-required-exhaust-pipe-size.11552/

http://garage.grumpysperformance.co...-exhaust-pipe-diam-for-your-application.1730/

http://garage.grumpysperformance.com/index.php?threads/is-backpressure-hurting-your-combo.495/

http://garage.grumpysperformance.com/index.php?threads/building-an-exhaust-system-for-your-car.1166/

http://garage.grumpysperformance.co...-calculators-and-basic-math.10705/#post-72061

http://www.wallaceracing.com/Calculators.htm
useful related info
http://garage.grumpysperformance.co...ard-starting-tpi-crossfire-or-lt1-vette.1401/

http://garage.grumpysperformance.com/index.php?threads/code-scanners-software.3096/#post-18612

http://garage.grumpysperformance.co...lay-switch-locations-and-info.728/#post-54562

http://garage.grumpysperformance.com/index.php?threads/adjusting-your-tps-and-iac.168/

http://garage.grumpysperformance.co...-system-trouble-shooting-flow-chart-info.596/

http://garage.grumpysperformance.co...too-common-questions-can-be-found-here.12892/

http://garage.grumpysperformance.co...eight-trouble-code-scanners.11056/#post-49140

http://garage.grumpysperformance.com/index.php?threads/odbii-scanners.9697/#post-36100

http://garage.grumpysperformance.co...ittent-cylinder-miss-problem.9478/#post-34812

http://garage.grumpysperformance.co...an-obdii-reader-analizer-ect.8136/#post-29345

http://garage.grumpysperformance.co...h-flicker-on-dash-and-radio.13593/#post-70202