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I have a 1989 gmc K2500 it blew the exam fuse a few times…

Customer Question
I have a 1989...

I have a 1989 gmc K2500 it blew the exam fuse a few times now when I start it it’s not running good

Mechanic's Assistant: Do all the fuses have the correct amperage for the circuits they're in?

Yes I change fuel pump relay . It was running well blew the fuse changed it is strays but has no power now

Mechanic's Assistant: Are you fixing your 2500 yourself? What have you tried so far?

Changed the fuse and the relay . When it died it was running good changed the fuse when it blew . Started it again now it runs bad

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

I not sure if it can be a weak fuel pump or sending unit

Submitted: 4 months ago.Category: Chevy
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Customer reply replied 4 months ago
Hello
Customer reply replied 4 months ago
Is anyone there
Answered in 4 minutes by:
12/8/2017
Chevy Mechanic: Randall C, ASE Master Tech replied 4 months ago
Randall C
Randall C, ASE Master Tech
Category: Chevy
Satisfied Customers: 13,258
Experience: ASE Master, L1, 32 years, Diagnostic / Electrical Specialist
Verified

Yes,sorry for the delay. I need the engine size and what fuse? you wrote " exam fuse"

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Customer reply replied 4 months ago
5.7
Customer reply replied 4 months ago
Exam
Chevy Mechanic: Randall C, ASE Master Tech replied 4 months ago

you say exam, do you mean ECM? I hev never heard of an exam fuse, where is this fuse?

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Customer reply replied 4 months ago
In fuse box says ecm ign
Customer reply replied 4 months ago
Under dash
Chevy Mechanic: Randall C, ASE Master Tech replied 4 months ago

ok, thanks, ***** ***** writing EXAM fuse. Back shortly

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Chevy Mechanic: Randall C, ASE Master Tech replied 4 months ago

have to opt out. sorry

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Customer reply replied 4 months ago
Well
Chevy Mechanic: Roy, import/domestic specialest replied 4 months ago
Roy
Roy, import/domestic specialest
Category: Chevy
Satisfied Customers: 7,273
Experience: ASE master tech for 40 years
Verified

do you still need help??

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Customer reply replied 4 months ago
just changed ecm unit runs with very weak power . Sounds like Tbi sucking air
Chevy Mechanic: Roy, import/domestic specialest replied 4 months ago

ok new expert here

let me get a diagram for you

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Customer reply replied 4 months ago
No stopped before I change it
Customer reply replied 4 months ago
Sounds like tbi sucking in to much air
Chevy Mechanic: Roy, import/domestic specialest replied 4 months ago

that is the idle air control valve making that noise. it is a regulated vacuum leak to get an idle

what did you do to stop the fuse from failing??

Roy

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Customer reply replied 4 months ago
Changed the fuse that all it blew a few times then stared . But now runs with no power. It ran well thill then
Chevy Mechanic: Roy, import/domestic specialest replied 4 months ago

that is with the new ecm.

what about if you install the old ecm??? does it still have no power?? did this exist prior to the fuses failing???

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Customer reply replied 4 months ago
it was working replaced to see if that was the problem
Chevy Mechanic: Roy, import/domestic specialest replied 4 months ago

put the old one back in and see what happens.

it sounds like you have a harness issue. you moved the harness around replacing the ecm.

Roy

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Customer reply replied 4 months ago
It was running bad that’s why I changed it
Chevy Mechanic: Roy, import/domestic specialest replied 4 months ago

ok I thought you said it was ok prior to the change

Roy

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Customer reply replied 4 months ago
No it’s was running bad that’s why I changed it
Customer reply replied 4 months ago
Truck ran good before fuse blew could it be the sending unit on fuel pump
Customer reply replied 4 months ago
It runs but runs rough with no power
Chevy Mechanic: Roy, import/domestic specialest replied 4 months ago

I thought it was because you were blowing fuses as in your original post.

the fuel pressure should be checked. if it is low it will cause this

Roy

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Customer reply replied 4 months ago
It did blow the fuse
Chevy Mechanic: Roy, import/domestic specialest replied 4 months ago

ok

start with checking the fuel pressure

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Chevy Mechanic: Roy, import/domestic specialest replied 4 months ago

Please take a moment and rate my service 3 stars or better. that is the only way the site will pay me for my efforts.

Roy

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