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Curtis
Curtis, Australia Car Mechanic
Category: Australia Car
Satisfied Customers: 1606
Experience:  Qualified Automotive Mechanic, LPG & Airconditioning Diagnostic Technician.
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Stops at random, dead throttle, misfires and shakes at

Customer Question

Stops at random, dead throttle, misfires and shakes at restart then stops, foot to floor doesn't help, wait 20 mins to half hour then starts normally.
JA: Have you checked the battery, particularly the terminal connections? Are they corroded?
Customer: yes and no
JA: What is the make/model/year of your car?
Customer: Holden Adventra VS 2004, Gen 3 V8
JA: Are you fixing your vehicle yourself? What have you tried so far?
Customer: No but am desperate and taking things into my own hands to research. Pushed and prodded every plug I can see. Mechanic has to see it happening to ber any use.
JA: Anything else you want the mechanic to know before I connect you?
Customer: It started over the last 3 weeks or so when idling down town and hot. Starts to run rough, foot to floor it gets rougher and then stops.
Submitted: 1 month ago.
Category: Australia Car
Expert:  Gary replied 1 month ago.

Hello there,

Sounds like a fuel pump failure about to be terminal.

Commodore fuel pumps are the most common failure.

Has the car been checked for codes yet?

Has a Holden tech looked at it?

Gary

Customer: replied 1 month ago.
No codes come up when checked. Tech is experienced with Holden. Fuel pump was replaced 1 year ago. At that time it started normal revs for 1 second and died. This time starts but real rough tending to backfire.
Customer: replied 1 month ago.
Gen III V8 5700
Expert:  Gary replied 1 month ago.

I would check the fuel pressure to eliminate it as a possible cause.

I've done this with a gauge taped to the windscreen many times.

Was the tank checked for any foreign material prior to the pump replacement?

I have seen the pump connector with burnt out the female terminals.

Once I have proved all of this I would then look at some engine PCM data via TECH2.

Yes I understand you have an LS1 5.7.

Gary

Customer: replied 1 month ago.
My mechanic has offered to connect a gauge so I can check when it happens. I don't know if the tank was checked prior to pump replacement but it was done by a GMH dealership. The pump terminals ... is that connector under or on top of the tank. This is a wagon don't forget. Thanks so far ...
Expert:  Gary replied 1 month ago.

That's all good info so far.

The connector for the pump is on top of the pump MRA assembly.

Tank out job, no matter what body style.

Yours is easy, like a sedan.

Gary

Customer: replied 1 month ago.
Mmmm .... It's Friday night and my brain is exhausted.
Thanks for that Gary. Might call it a night, eh?
Lynden
Expert:  Gary replied 1 month ago.

No worries Lynden.

Come back when you are ready.

Good night for now.

Gary

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