help me.. code 42.. AGAIN.

[TType84]

hey guys.. i'm having some problems with the car stalling while driving.

at first i had a high CTS code in the computer, so i found out the wires were horribly repaired by the previous owner, so i fixed them, car ran great for a week.

RUH ROH.. ITS BACK. I was coming home frmo the store today and got stranded 3 times on the highway. after the first time i assumed it was the CTS sensor itself, so i unplugged it and the car started right up, got halfway home and BAM. it stalls again so i pull over on the shoulder again and sit there. after a few minutes it started back up and i continued on my way again, almost home and the car died... i coasted frmo 70 down to about 45 and it started back up by itself, i'm assuming the TC isnt locknig and the engine is just freewheeling with the tranny.

anyway, so its NOT THE CTS. and its NOT THE COILPACK.

the coil pack is a week old accel model...

now i have 3 hotair ignition modules and two 86/87 modules to work with.. i just dont have time to **** with it right now before work cause the car is sizzling hot.

The symptom can only be described as the ignition module and coil pack taking a time out. a lot of the time on the highway it will turn off for a few seconds and i'll coast and then without even letting off the gas or anything, it just comes back on, kind of like a governor in some new cars, the engine just turns off for a few seconds till you slow back down then bam it comes back on like nothing ever happened. the tach drops to 0 but the oil pressure stays up so i know the engine continues to spin...

if i try all 4 spare modules and that doesnt solve the problem, what else could it be? It's not the CTS because it still pulls this bull**** even when the CTS is unplugged..

any ideas guys? i am dying here!

thanks.

 

[1badTTA]

HAve you checked the wiring to the crank sensor? You mentioned that the tach went to 0 but you still had oil pressure so that may say something in itself. Just a suggestion on something else to check.

 

[boostmaster]

Crank sensor

good call I'd say crank sensor also since the ecm gets its rpm signal from the crank.

 

[salvageV6]

Code 42 open or grounded circuits 423 or 424 between the ECM and the module.

If it ain't the wiring it's the ECM or module.

Got my Code 42 today as well.

Car runs "okay" until you hit exactly 1 psi boost then it cuts right out and dies.

Very funky and no fun.

Better not be the modded ECM I just bought used.

Search the tan and wht. wires A and B on the module and B4 and D5 on the ECM.

Unplug both and use an ohmeter between each location and check for continuity and to ground, you don't want a reading to ground and want low ohms between the ECM and the module.


I guess I also will be doing this tomorrow. I also have the translator+ to deal with as well.