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Got apo443. Got a Po 443 po122po403po405codes. 04 3.4.

Customer Question
Got a Po 443...

Got a Po 443 po122po403po405codes. 04 3.4

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

Changed fuel pump an regulator Won't start ya myself acts like no fuel

Mechanic's Assistant: Have you ever replaced the fuel pump, or is this the original?

New pump got feeling someone put sugar in tank

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

It will start with starting fluid won't run without

Submitted: 4 months ago.Category: Pontiac
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Answered in 2 minutes by:
11/26/2017
Pontiac Mechanic: Dan, Technician replied 4 months ago
Dan
Dan, Technician
Category: Pontiac
Satisfied Customers: 25,681
Experience: Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
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Hello, my name is ***** ***** I'm here to help get your problem solved.

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Pontiac Mechanic: Dan, Technician replied 4 months ago

Have you unplugged the throttle position sensor to see if it will start?

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Customer reply replied 4 months ago
No not even sure witch plug it is
Pontiac Mechanic: Dan, Technician replied 4 months ago

What model Pontiac do you have? I can send you a picture.

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Customer reply replied 4 months ago
04 3.4
Pontiac Mechanic: Dan, Technician replied 4 months ago

Grand am?

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Pontiac Mechanic: Dan, Technician replied 4 months ago

Here is a picture, let me know if disconnecting it allows vehicle to run. Thanks. https://www.dropbox.com/s/xegcua2pxw6ocpj/tbr.PNG?dl=0

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Customer reply replied 4 months ago
No change not even trying to start
Pontiac Mechanic: Dan, Technician replied 4 months ago

Unplug the mass airflow sensor and let me know if that helps.

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Customer reply replied 4 months ago
No change
Pontiac Mechanic: Dan, Technician replied 4 months ago

Next step is to check fuel pressure, let me know what pressure reading is with key on engine off. Thanks.

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Customer reply replied 4 months ago
Don't have gages but doesn't seem to have any pressure
Pontiac Mechanic: Dan, Technician replied 4 months ago

That would most likely mean the fuel pump has failed but you will want to test pressure before replacing anything. If pressure is under 40 psi then start by replacing filter, if still low verify the pump gets good power/ground while trying to start and if so replace the pump. Let me know how it goes or if you have questions, thanks.

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Customer reply replied 4 months ago
Its a new pump and filter had good pressure coming out of filter
Pontiac Mechanic: Dan, Technician replied 4 months ago

You either have low pressure or missing injector pulse so you could check injector pulse. At injector one wire should have constant power and other should pulsate ground off/on while trying to start. When turning key to on position does the security light stay on?

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Customer reply replied 4 months ago
I checked still has good pressure out of filter when I changed old filter hard to blow through think I will Pull intake an blow out lines can check OUT injectors then what do you think
Pontiac Mechanic: Dan, Technician replied 4 months ago

I​ think that is a good idea if new filter is already seeming to be clogged, I'd also clean out fuel tank.

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Customer reply replied 4 months ago
I cleaned tank when idid pump new filter ok seems to be past that an before rails
Pontiac Mechanic: Dan, Technician replied 4 months ago

I would still recommend doing a fuel pressure test at fuel rail otherwise you are just jumping around guessing hoping to stumble into.

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Pontiac Mechanic: Dan, Technician replied 4 months ago

Ever get it figured out? Please do not forget to rate answer. Thanks.

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Dan, Technician
Category: Pontiac
Satisfied Customers: 25,681
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Experience: Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database

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