Shuts off and will not restart, code 42

The link I sent you listed the AC/Delco pump.

Roy

FO change op chk bad sameness problem

I don’t have a constant pulse at the injector until it starts up, but won’t run long what controls the pulse

Pick hon coil I’m guessing

if it is spark thats dropping, the pick up coil is fed power from the module.

Roy

Well right now the truck has no pulse to injectors, just found out the rotor Ian had so to the peice of copper in the middle I guess has Fallon off been bumped from on and off or somthing eles but regardless I have a new
ONe now tryin it again

But still don’t have pulse unless this peice broke after we got it started more to follow give me 15min

I was under the impression that the pulse of the injector gets the polls from the pick up coil is that incorrect information

Trying to figure out how to pick up coil and why the pick up coil would need power from the module one the way it looks to be wired is it comes off of the pick up coil through the module to the coil and then on to the spark plugs so on and so forth is that not the way it supposed to run

Unless I cross wires to modual it will not go

the pickup coil controls spark only.

the pulsating of the injectors is controlled by the ecm quad drivers. the ecm makes and breaks the ground on the injectors to fire off the injectors.

the ecm is a common failure for this.

is there any other codes popping up??

Roy

Started and is running now, but just shut off again very frustrating

No codes at all, let me jimmy it again and see if I can get
Any

when it does run. tap the ecm with a screwdriver and see if it stalls

Roy

I can’t keep it running for long but will try again, eco behind gloves box correct

ECm pcm two differsnt things??

ecm is behind the glove box

before 96 it is an ecm. after 96 it is a pcm

Roy

Copy that, can it b rest reflashed ect or with what I have for the problem it’s a change

WOW looks like a parshal dash removal

nope, comes down very easily. it comes down after removing a couple of bolts. it is a plug and play. just have to change the prom.

Roy

It’s righr n front of me but don’t see any bolts to remove

NO bolts it slides in onto a tray, I guess before I chase this rabbit I want to make sure this is a good fix

it comes down to the floor. try pulling it down

Roy

REMOVAL:

1. Disconnect the negative battery terminal.
2. Remove glove box panel.
3. Remove mounting brackets and/or retainers.
4. Remove control module from tray.
5. Disconnect control module harness connectors.
6. Remove access cover and PROM (MEM-CAL).

Here’s the tray

Just need to b almost 100% on this repair before I get an ECM, I have had the battery disconnected for
Several hours R2 the FP so it has been rest that way um wonder if I can get it tested or
Reflashed

Roy u been so good to me thanks for the help u have provided um I’ll see about a new ECm from wherever on Monday or see if it can be reflashed ext

there is no flashing the old ecms. disconnecting the battery does nothing.

did you try the tap test I suggested

Roy

Could never get it to start

And never could get the injectors to spray as I cranked um is there a ECm check to do to say good or bad ecm

Kinda lost trying to figure out y I hv a ECM failer but not chech eng ligy

there is no checks you can do for the ecm without removing it and sending it out to be checked.

Wonder y I hv no check eng light if a major electrical component is failed

I guess the question is how do mechanics at shops determine ecm’s r bad without chasing there tail and losing money

OBD1 was not that smart. it only coded when there was a hard failure. codes do not always tell you the failure even on newer cars. you still need to do good old fashion diagnostics.

You do the checks I suggested to you. based on those results, we determine if it is an ecm failure.

Roy

Can’t think of anything else, to what I have read the injectors r controlled by the ECM exclusively

Exactly what I have told you over and over

Roy

Oh I guess I didn’t remember u tell me that but now I guess I’ll hv to find an ECm May go to a salvage yard this week

ok, the numbers must be exactly the same.

keep us updated

Roy

Just got home from church, truck fired up have spark and
Fuel pulse, tapped on ECm truck stayed runnng, when the truck did shit off I checked for spark and it didn’t seem to string on that plug but it fired up and I Putnam the boot back on the plug, ran then I shut it off um started it back up good spark good pulse been running now about 6 min it’s at good operating temp good oil press good volts, this is mind blowing to me I’m at a loss of words right now