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Username Post: Odd Starting Problem        (Topic#348837)
Springbank 
Forum Newbie
Posts: 37

Reg: 07-23-13
12-23-17 03:34 PM - Post#2718876    

The truck is a 1992 C1500 WT with the V6. I've posted about this truck in the past, but now I seem to have a new issue. I had starting problems, which were caused by the fuel pump, and I had the fuel pump replaced. The problem now is that if the truck sits for much over a week, it won't start. It will crank, but won't fire at all. If I try the next day it will start right up. This has happened twice now. If I start it once a week I have no problems, and the truck runs fine once it's going. Any ideas out there?



 
bowtie44s 
Valued Contributor
Posts: 3866
bowtie44s
Age: 35
Loc: wv
Reg: 08-29-12
12-23-17 04:04 PM - Post#2718879    
    In response to Springbank

Check your fuel pressure. Sounds like a fuel pump again. What brand did you put in?

Jeff

'88 Chevy K3500, aluminum head roller cam 511in³ stroker 10.5:1 compression, 96 NV 4500, 94-98 grille, 305/70-16 (33x12) BF Goodrich KM2s, 91 cluster swap


 
stumppuller 
"7th Year" Gold Supporting Member
Posts: 819
stumppuller
Loc: Canada
Reg: 11-01-04
12-23-17 05:29 PM - Post#2718888    
    In response to bowtie44s

Just to add to the above comments;

Assuming it's a TBI motor, check for spark at the plugs (I use a timing light) and fuel spray from the injectors when it won't start. This will give you a good starting point to troubleshooting the issue.

-91 Sierra C2500, now K2500
-81 Chev K20


 
Springbank 
Forum Newbie
Posts: 37

Reg: 07-23-13
12-25-17 08:31 AM - Post#2718965    
    In response to stumppuller

The pump was put in by a local shop. Not sure what they used. I have a spark tester on the way. I just don't understand why it will start and run fine the next day.



 
bowtie44s 
Valued Contributor
Posts: 3866
bowtie44s
Age: 35
Loc: wv
Reg: 08-29-12
12-25-17 08:40 AM - Post#2718966    
    In response to Springbank

  • Springbank Said:
The pump was put in by a local shop. Not sure what they used. I have a spark tester on the way. I just don't understand why it will start and run fine the next day.



That's why I like doing my own work. There is no way to tell what they used but there is a good chance they used the cheapest one they could get. You should use an AC Delco or a Delphi.

Running fine one day and not starting the next is how a bad fuel pump behaves. When it won't start, put your ear by the tank and see if you can hear the pump running for 2 seconds after the key is turned on. Sometimes you can kick the tank and the shock will get the pump to start. This is only temporary, the pump has one foot in the grave.


Jeff

'88 Chevy K3500, aluminum head roller cam 511in³ stroker 10.5:1 compression, 96 NV 4500, 94-98 grille, 305/70-16 (33x12) BF Goodrich KM2s, 91 cluster swap


 
runamukker 
Forum Newbie
Posts: 44

Reg: 01-01-18
01-01-18 06:16 PM - Post#2719722    
    In response to bowtie44s

  • bowtie44s Said:

Running fine one day and not starting the next is how a bad fuel pump behaves. When it won't start, put your ear by the tank and see if you can hear the pump running for 2 seconds after the key is turned on. Sometimes you can kick the tank and the shock will get the pump to start. This is only temporary, the pump has one foot in the grave.




Also can check the ground on the harness that goes to the fuel pump. It should be grounded to the frame next to the harness plug.
It has a 13mm bolt that holds a single wire to the frame, those like to rust up and make an intermittent connection.


'92 K1500 Blazer Z71 350TBI 700R4 , 253,000 miles
'94 C1500 Cheyenne WT 350TBI 4L60e , 565,000 miles


 
Springbank 
Forum Newbie
Posts: 37

Reg: 07-23-13
01-06-18 06:18 PM - Post#2720277    
    In response to runamukker

It's been too darn cold to work on the truck outside. A friend of mine did notice that the truck's failure to start seemed to coincide with rain, and suggested that the ignition control module might be at fault. Since it quit raining, and everything has been frozen, the truck starts. I noticed that there are two modules out there that the Autozone web site says will fit. Autozone also sold me all the wrong parts for the exhaust system a few years ago. One is without HEI, and one with. How do I tell which one I have or need? My Chilton book seems to indicate that there were two systems, with the DI system starting in 1993. I have a 1992 C1500 WT with the V6. That seems to me to be the HEI. I apologize if this is a dumb question, but this is my first Chevy, and only my second GM product. My first was a '78 Olds Cutlass Supreme, and I wish now I had kept it!



 
runamukker 
Forum Newbie
Posts: 44

Reg: 01-01-18
01-06-18 11:31 PM - Post#2720295    
    In response to Springbank

The ACDelco D1943A or D1984A are both correct for your distributor/truck.

The ACDelco catalog says your 4.3 engine is Vin Z http://parts-catalog.acdelco.com/catalog/catalog_s...

The D1943A is original equipment"All; w/o HEI; VIN: Z*"
The D1984A being listed as "All; w/Dist# 1103951; Vertical Dist Towers"

There is only one distributor listed for your application. It makes no sense for ACDelco to be so confusing about those parts.

I believe there are in-truck troubleshooting procedures for the ignition module or maybe autozone will test it for you.
-----
As an example of the interchangibility of D1943A & D1984A...
On my 1992 Blazer 5.7 the D1943A is original equipment "All; w/o HEI; VIN: K*" with the D1984A being listed as "ALL" so either works.




'92 K1500 Blazer Z71 350TBI 700R4 , 253,000 miles
'94 C1500 Cheyenne WT 350TBI 4L60e , 565,000 miles


 
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