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1996 VS V8 (308) ute...petrol at first start..gas backfire…

Customer Question
I have a 1996 VS...
I have a 1996 VS V8 (308) ute. Having problems starting on petrol at first start. End up starting it on gas, but very doughie on initial take off (engine light lit)

I have had gas backfire whilst running on gas and engine light on. After backfire, engine stalls and I have to pull over. After sitting roadside for a few minutes, it starts on petrol and will switch to gas (without engine light on).

I had an auto elec check it out (no errors)

I had a 200,000 major service done last week, where it ran without fault for 3 days. Went to start this morning on petrol...no go.

My fuel filter was not changed by mechanic at major service..could this be a reason for no petrol start?

I can hear the fuel pump working, but still does not start (on occassion)

Many Thanks

Steve
Submitted: 8 years ago.Category: Australia Car
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Answered in 5 hours by:
6/29/2010
AU Auto Mechanic: Curtis, Australia Car Mechanic replied 8 years ago
Curtis
Curtis, Australia Car Mechanic
Category: Australia Car
Satisfied Customers: 1,746
Experience: Qualified Automotive Mechanic, LPG & Airconditioning Diagnostic Technician.
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It is common on this model to have a coolant temperature sensor fault causing a no start on petrol especially as it gets colder. You will need to have the sensor replaced to rectify. Also the backfire when on gas is going to be related to an ignition system issue. I recommend replacing your ignition leads before going further.

Curtis
Curtis, Australia Car Mechanic
Category: Australia Car
Satisfied Customers: 1,746
Experience: Qualified Automotive Mechanic, LPG & Airconditioning Diagnostic Technician.
Verified
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Customer reply replied 8 years ago

Thanks Curtis.

 

I started my car 'first go' last night, after sitting in sub 10 degrees for 2 days. This morning, whilst in the garage 3 degree temperature the car turned over but would not ignite.

I then switch to gas and it started, with the engine light on and very sluggish in power. I drove 10 kilometres before it backfired and stalled. I pulled off road and sat for a few minutes. I then switched to petrol and it started first turn of key.

This happens intermitantly and is very unreliable (especially in country roads)

 

I am losing confidence in cars reliability.

 

Steve Hazell

Melbourne VIC

AU Auto Mechanic: Curtis, Australia Car Mechanic replied 8 years ago
This does sound like a fault with the coolant temperature sensor, it does match these symptoms.
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