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Username Post: Engine dies randomly        (Topic#364764)
kenh 
Newbie
Posts: 10

Reg: 09-12-20
03-30-21 10:12 AM - Post#2817139    

I have a 1990, K1500, 5.7 TBI. 224,000 miles.

Very randomly the engine will just shut off, like you turn the key off.

It is totally random. Yesterday I started the engine after a short time in a store. Idled to the end of the row I was parked in, and it died. I have been driving down the road at 60 MPH and it will die. Coasting to a stop sign from 60 and it has died. It might happen twice in a day or go two months without incident.

I've changed the ignition module after the first time but that module was dead. Second time I changed the module again but the "old" module tested OK.

I've checked for loose connections but found none. The wires to the coil seem a bit on the tight side like something is not positioned correctly but I don't think that is an issue???

I bought the truck about a year ago and this is the only ongoing issue I can't solve.

Any ideas will be much appreciated. Thank you!!

Ken



 
CowboyTrukr 
"1`th Year" Silver Supporting Member
Posts: 4581
CowboyTrukr
Loc: Salt Lake City
Reg: 06-20-09
03-30-21 05:12 PM - Post#2817154    
    In response to kenh

Ken, get your hands on a TBI fuel pressure test kit. The big chain stores usually have them available for rent.

Tie it into the fuel line after the filter. Let us know what you find.

Greg

‘01 Silverado 2500HD 8.1/Allison 1000 Xcab/LB
'00 Explorer XLT 4.0 SOHC V6 Auto
'95 K1500 Z71 EC Short Step 5.7L+0.040/NV3500 SOLD

"The only thing necessary for evil to triumph is for good men to do nothing" Sir Edmund Burke


 
YOUNG57 
Frequent Contributor
Posts: 1303

Loc: Tennessee
Reg: 12-06-10
03-31-21 07:33 AM - Post#2817194    
    In response to kenh

Did you put heat conducting grease under your ignition module (between it and the housing)? They are heat sensitive.



 
kenh 
Newbie
Posts: 10

Reg: 09-12-20
04-01-21 08:35 AM - Post#2817271    
    In response to YOUNG57

Young, I did grease the ICM with the provided grease. Yes I know they are heat sensitive. Also made sure the mating surfaces were nice and clean before adding the grease.

Cowyboy, It seems weird that fuel pressure would be the cause of this problem but I can sure check it. Maybe I should put a gauge in the cab to monitor the pressure???

Could I have a funky ignition switch? NOT the tumbler, but the switch itself?

Thanks!

Ken



 
CowboyTrukr 
"1`th Year" Silver Supporting Member
Posts: 4581
CowboyTrukr
Loc: Salt Lake City
Reg: 06-20-09
04-02-21 08:17 AM - Post#2817334    
    In response to kenh

Fuel pumps are strange. I had a brand new Bosch pump go bad on me within 3 days of installing. Going down the highway at 65 and it just died.

I replaced it with a Delphi HP10000 and never had another problem.

It’s worth checking so you know. The TBI pump pressure is a lot more forgiving than on the Vortec engines.

Greg

‘01 Silverado 2500HD 8.1/Allison 1000 Xcab/LB
'00 Explorer XLT 4.0 SOHC V6 Auto
'95 K1500 Z71 EC Short Step 5.7L+0.040/NV3500 SOLD

"The only thing necessary for evil to triumph is for good men to do nothing" Sir Edmund Burke


 
someotherguy 
Senior Moderator
Posts: 29367
someotherguy
Loc: Texas
Reg: 08-01-03
04-02-21 08:37 AM - Post#2817337    
    In response to CowboyTrukr

100% agreed. I've personally experienced a TBI pump that was somewhat intermittent before it gave up completely. Checking spark and fuel pressure at the time of failure is what will help track down the cause. Problem is, without the special fitting installed so that you can check pressure (see the FAQ post at top of the forum) it's tricky to be "ready to go" to check pressure when the truck stalls out. You can check spark quickly and rule that out. With the pressure kit fitting installed in a permanent or semi-permanent position, you can check fuel pressure quickly, too. I drove around for a few days with the gauge in my door panel pocket ready to slap it on.

Richard

06 Silverado ISS / 06 Silverado SS / 06 300C SRT8


 
CowboyTrukr 
"1`th Year" Silver Supporting Member
Posts: 4581
CowboyTrukr
Loc: Salt Lake City
Reg: 06-20-09
04-02-21 09:38 AM - Post#2817342    
    In response to someotherguy

If you want permanent monitoring, you can do this. I bought an adapter and tied it in at the throttle body. You have to unhook the fuel line clamp that’s tied to the upper transmission bolt so you can pull the fuel line back enough without kinking it.


If anybody wants to see the live video feed of that Bosch failing, feel free to PM me your email and I’ll send it.

I just don’t have a YouTube account set up to link it here.

Attachment: 90A37EF5-D2C8-40C8-B9DC-9FF73F48A8CB.jpeg (1.89 MB) 3 View(s)




Greg

‘01 Silverado 2500HD 8.1/Allison 1000 Xcab/LB
'00 Explorer XLT 4.0 SOHC V6 Auto
'95 K1500 Z71 EC Short Step 5.7L+0.040/NV3500 SOLD

"The only thing necessary for evil to triumph is for good men to do nothing" Sir Edmund Burke


 
kenh 
Newbie
Posts: 10

Reg: 09-12-20
04-03-21 02:57 PM - Post#2817401    
    In response to CowboyTrukr

What is is weird is it will restart while coasting. Like as soon as it dies it will immediately restart. Maybe some funky wiring, bad ground?????

If the damn thing would just die and stay dead then it could be fixed! :laugh :

Ken



 
lt1zr28 
Newbie
Posts: 2

Reg: 04-02-21
04-03-21 06:58 PM - Post#2817405    
    In response to kenh

I had a similar thing happen. This may not be the fix but here we go. My 88 would die in drive or reverse unless I would keep my foot on the gas. There is an oil pressure sending unit at the back of the intake behind the distributor that was weak.It sends a signal to the computer to engage the fuel pump. Be careful if you try to replace it as the brass 90 is not very strong.



 
kenh 
Newbie
Posts: 10

Reg: 09-12-20
04-04-21 06:18 PM - Post#2817482    
    In response to lt1zr28

Already been replaced. Oil pressure is OK verified by a regular gauge. A little low but not much.

Ken



 
lt1zr28 
Newbie
Posts: 2

Reg: 04-02-21
04-04-21 08:10 PM - Post#2817489    
    In response to kenh

Did you check to see if you have any codes ?



 
Maxbigblock 
Site Ambassador -
Posts: 3001

Age: 70
Loc: Stuart, Florida
Reg: 12-16-01
04-06-21 03:37 AM - Post#2817564    
    In response to kenh

  • kenh Said:
What is is weird is it will restart while coasting. Like as soon as it dies it will immediately restart.

Ken



I've had the same problem with my 1988 pickup. It dies and then will restart and run great. It usually goes 2 to 3 years or more between incidents.


Max

I'm originally from the ONCE great city of Flint, Michigan. The birthplace of General Motors, where A C Spark Plug was formed and headquartered, where the first Corvettes were hand built, and where my 1955 Chevy was made.



 
BigDogSS 
"12th Year" Silver Supporting Member
Posts: 4903
BigDogSS
Loc: SoCal
Reg: 12-21-01
04-07-21 06:01 PM - Post#2817680    
    In response to kenh

I say find and clean all of the grounds and make sure they have a great connection.

    1967 Chevrolet Impala SS convertible 327 - Ermine White C1 - VCCA Senior Award
    1967 Chevrolet Impala SS Sport Coupe 396 - Marina Blue FF - personal "barn-find" lol



 
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