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I have a 1988 Silverado. at times it will not crank unless…

Customer Question
I have a 1988...

I have a 1988 Silverado. at times it will not crank unless you our gas in the throttle body. the pump is putting the gas to the throttle body. it just left me beside the road and I had it towed home. ??????????????????????

Mechanic's Assistant: What confuses you?

Why is this happening? how do I find out what is wrong

Mechanic's Assistant: Have you checked the fuel supply? And are all the spark plugs working?

Yes I have

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

New plugs fire new gas filter

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

I was coming home and it just shut off and wouldf not crank

Submitted: 8 months ago.Category: Chevy
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Answered in 3 minutes by:
11/10/2017
Chevy Mechanic: Eric, Automotive Repair Shop Manager replied 8 months ago
Eric
Eric, Automotive Repair Shop Manager
Category: Chevy
Satisfied Customers: 34,946
Experience: 20+ yrs. experience as repair shop manager and technician.
Verified

HI,

What size engine?

When it runs off gas poured into the throttle body, does it stay running or quit as soon as you stop pouring gas into it?

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Customer reply replied 8 months ago
It stays running
Chevy Mechanic: Eric, Automotive Repair Shop Manager replied 8 months ago

HI,

Ok, what size engine

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Customer reply replied 8 months ago
It is a 350
Chevy Mechanic: Eric, Automotive Repair Shop Manager replied 8 months ago

I am going to have to opt out and see if another expert can help as I dont have the specs I need to walk you thru some testing. I suspect your fuel pump or pressure regulator, but will let another expert help that can walk you thru the testing needed

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Chevy Mechanic: HDGENE, ASE Master Tech replied 8 months ago
HDGENE
HDGENE, ASE Master Tech
Category: Chevy
Satisfied Customers: 6,596
Experience: 28 years Auto experience, Ford, GM, Chrysler, Asian & European
Verified

Hello, so right now it cranks but wont start? Do you see the injectors spray fuel at the throttle body? Have you checked for fuel pressure at the fuel filter? Has the filter been changed recently?

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Customer reply replied 8 months ago
It will not run at all now. No fire to plugs.
Chevy Mechanic: HDGENE, ASE Master Tech replied 8 months ago

Ok it has no spark, do you have fuel pressure and do you have injector pulse? A loss of rpm signal can cause both no injector pulse and no spark. Do you have battery voltage to the coil?

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