Threw the Parts Cannon at it. Maybe ECM???

[Caspian1911]

Hey Guys mine is a 92 C/K 2500 Silverado 5.7 RWD mileage is 101200
Here Are My Problems:
power sputters/Shutters after warm up only under load in gear
occasionally stalls after warm up at low RPM like backing up.
struggling to start but only after its been warmed up.

I've replaced the EGR Valve. the Distributer and Coil, cap and rotor button, TPS, O2 censor, Knock sensor, cut out the Cat converter. dropped the gas tank and replaced Fuel pump and cleaned out the tank.
The code I'm receiving is 42
I have thrown every thing I know at this thing and its still the same symptoms. I set the timing at 0 but its seems a little sluggish.

Could all this be my ECM does anyone have any ideas before I bite the bullet and die inside by taking it to get serviced I've never been this stumped before. Thank you all in advance for any help.

 

[deadbeat]

I assume when you did the cap and button that you changed the plugs and wires?

 

[Caspian1911]

I assume when you did the cap and button that you changed the plugs and wires?

About 3000 miles ago great spark all the way around

 

[1997]

42

Ignition control module (ICM) – electronic spark timing (EST)/ignition control (IC)/bypass circuit malfunction

Wiring open circuit/short circuit to ground, ICM, ECM

maybe time to download manuals and do some reading and invest in a scanner.

the manuals have excellent code/trouble shooting guide.

88-98 Service Manuals

Over the years I have collected a bunch of GM service literature. Links to PDF Scans of service and STG manuals and a links to the Parts manuals. You'll need the FREE Adobe Acrobat reader to open these files. Get it directly from Adobe here {http://get.adobe.com/reader/} If you're not...

www.gmt400.com

ECM would be the very last thing to replace after confirming everything else is ok, imo.

Is 42 your only code?

 

[scott2093]

Recent thread that's still going with somewhat similar issue. A 454 but maybe some relevant info as well....

92 Suburban 454 code 42 stalls entering closed loop

1992 suburban 454 7.4 has an issue with code 42 and stalling entering closed loop in idle. It has a bunch of new sensors and including new o2 sensor. Ecm is 7060 with $d8 and refurbished already ( over 3 yrs old with previous owner) What would keep a 1 wire o2 sensor pinned in voltage? What...

www.gmt400.com

 

[JDGMC]

Hey Guys mine is a 92 C/K 2500 Silverado 5.7 RWD mileage is 101200
Here Are My Problems:
power sputters/Shutters after warm up only under load in gear
occasionally stalls after warm up at low RPM like backing up.
struggling to start but only after its been warmed up.

I've replaced the EGR Valve. the Distributer and Coil, cap and rotor button, TPS, O2 censor, Knock sensor, cut out the Cat converter. dropped the gas tank and replaced Fuel pump and cleaned out the tank.
The code I'm receiving is 42
I have thrown every thing I know at this thing and its still the same symptoms. I set the timing at 0 but its seems a little sluggish.

Could all this be my ECM does anyone have any ideas before I bite the bullet and die inside by taking it to get serviced I've never been this stumped before. Thank you all in advance for any help.

What are the RPMs when the selector is in Park and Drive?

 

[GoToGuy]

The ECM really is pretty reliable. It's the other things that wear out, fail, need regular service. Follow the diagnostic in the service manual for that code, it will guide your troubleshooting to repair. Or you can keep guessing and replacing parts that are good.

 

[JDGMC]

Hey Guys mine is a 92 C/K 2500 Silverado 5.7 RWD mileage is 101200
Here Are My Problems:
power sputters/Shutters after warm up only under load in gear
occasionally stalls after warm up at low RPM like backing up.
struggling to start but only after its been warmed up.

I've replaced the EGR Valve. the Distributer and Coil, cap and rotor button, TPS, O2 censor, Knock sensor, cut out the Cat converter. dropped the gas tank and replaced Fuel pump and cleaned out the tank.
The code I'm receiving is 42
I have thrown every thing I know at this thing and its still the same symptoms. I set the timing at 0 but its seems a little sluggish.

Could all this be my ECM does anyone have any ideas before I bite the bullet and die inside by taking it to get serviced I've never been this stumped before. Thank you all in advance for any help.

How do the plugs look?