HELP! NO INJECTOR PULSE,...non running 96 suburban tried everything

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

Doubeleive

Wes
Supporting Member
Joined
Nov 7, 2017
Posts
23,407
Reaction score
34,032
Location
Stockton, Ca.
i replaced the ICM with a known good one,..NO change. still nop injector pulse at the injectors. so its not the ICM. :(
it appears I wasn't too far off track, pulse comes from the ecm but icm also has something to do with, maybe check the injector harness and be sure you have a ground that has been a rare issue before on (gmt800's)
maybe this OLD thread on another forum may help?
 

east302

Full Access Member
Joined
Dec 21, 2016
Posts
1,555
Reaction score
1,379
Location
Mississippi
D69C2C9F-645C-42BF-BCC4-4C2944F7A05B.jpeg4F378098-9198-4D45-8319-C82DE4D0D969.jpeg

898666F0-7F7C-44AB-86E4-F16CC5D2C33B.jpeg

Pinout for a 1998 5.7L attached. Alldatadiy would have it, but they went up on their subscription cost so it’s not as much of a bargain as it once was. No guarantee that it’s the same for 96, but maybe close enough.

Did you set the CMP Retard (zero degrees at 1000-rpm) following the distributor replacement? That usually throws the P1345 code, but since you had it before I’d have said a distributor issue or timing chain problem.

Injector harness at intake:


ECE09E28-37B9-4652-AF55-379B89CB1AF4.jpeg
 
OP
OP
C

corbin dallas

TYF Newbie
Joined
Jul 19, 2020
Posts
21
Reaction score
13
I have not since I would suspect it would have noting to do with the harness to injectors not producing a ground to fire the injectors. am I wrong to assume that? i found a test procedure on her for icm,..but I think I have another one I can swap in and see. i will get back to you guys. thanks
i tried a known good ICM and coil,..still no injector pulse.
 

exp500

Full Access Member
Joined
May 14, 2017
Posts
1,781
Reaction score
1,609
A quick search showed downloadable pdf factory service manuals on ebay for $30 or so.
Search also found a few about 150 meg size free download. Suburban/tahoe/pickup will all work for this issue 96 only. 97 up computers 4 plug.
I still think you have some anti-theft, does it use a chipped key?
 
OP
OP
C

corbin dallas

TYF Newbie
Joined
Jul 19, 2020
Posts
21
Reaction score
13
A quick search showed downloadable pdf factory service manuals on ebay for $30 or so.
Search also found a few about 150 meg size free download. Suburban/tahoe/pickup will all work for this issue 96 only. 97 up computers 4 plug.
I still think you have some anti-theft, does it use a chipped key?
no chipped key. just old flat metal key. no antitheft warning light anywhere in gauge cluster. owned the truck for many years. no anti theft. not even a key fob. just single ignition key
 
OP
OP
C

corbin dallas

TYF Newbie
Joined
Jul 19, 2020
Posts
21
Reaction score
13
View attachment 353436View attachment 353434

View attachment 353435

Pinout for a 1998 5.7L attached. Alldatadiy would have it, but they went up on their subscription cost so it’s not as much of a bargain as it once was. No guarantee that it’s the same for 96, but maybe close enough.

Did you set the CMP Retard (zero degrees at 1000-rpm) following the distributor replacement? That usually throws the P1345 code, but since you had it before I’d have said a distributor issue or timing chain problem.

Injector harness at intake:


View attachment 353437
wow
View attachment 353436View attachment 353434

View attachment 353435

Pinout for a 1998 5.7L attached. Alldatadiy would have it, but they went up on their subscription cost so it’s not as much of a bargain as it once was. No guarantee that it’s the same for 96, but maybe close enough.

Did you set the CMP Retard (zero degrees at 1000-rpm) following the distributor replacement? That usually throws the P1345 code, but since you had it before I’d have said a distributor issue or timing chain problem.

Injector harness at intake:


View attachment 353437
well like I said it used to run even when i had the p01345 code. and the timing was crazy,..like 28 degrees. and got a new distributor to fix the problem,..and it didnt. i checked any play in timing chain and none at all,..it would start,..skip stumble and sputter right after startup and smooth out 100 feet down the road hot or cold. then one day it sputtered up the driveway and just dead. no injector pulse,....so if i can get it running again i will have to reset the distributor to zero,...i didnt do that when i installed the new one,..but it stopped running before i had the chance. thanks for the diagrams,...i will get back to you guys when i have more results!!! thanks
 

Forum statistics

Threads
128,786
Posts
1,805,442
Members
91,766
Latest member
GeorgeC
Top