amcleod1
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- VTII Calias 5.7L V8 GenIII
Hi all.
I'm hoping someone can help me with an intermittent engine start then immediate stall issue. I have searched this site and found some useful posts/info which I have followed and replaced a number of parts as suggested by the posts but problem remains.
Car is a stock 2000 VTII Calias with GENIII 5.7L V8 engine. Engine has 190,000km on it. Regularly serviced. No oil leaks. Runs 98 octane fuel. Never missed a beat before.
Problem / Symptoms:
The engine will start normally on most 1st attempts without issues - just by turning the key.
Sometimes the engine will start normally on 1st attempt but with very low rpm that builds to normal idle rpm within a few seconds.
Randomly however, say one out of every 10 first start attempts, the engine will crank and kick-over normally, but then immediately stalls
Most times it will then start and run on next start attempt
Sometimes it may take several re-start attempts
When it does start:
- sometimes it starts with very low rpm that builds to normal idle rpm within a few seconds
- sometimes I've had to floor or pump the accelerator pedal on the re-starts to get the engine to run
- sometimes turning the key from ON to START does nothing on re-start, no fuel pump priming, or start soleniod clicking in (have to turn key all the way back to off before engine will crank again)
Once started and running engine appears to run normally. The only abnormal running things I've noticed are:
-Idle is a little rough - vibrations felt throughout the car (occurred before and after new engine mounts recently installed.)
-Under heavy acceleration power is not applied smoothly - engine hesitates then power surges. This hesitation/surge occurs from standing start, and at speed following auto-transmission-kick down.
-Generally I'd say power overall for a 5.7L V8 seems low to me, but it has done some miles now.
So problem is best described as an intermittent engine start then immediate stall issue. Problem occurs randomly - I haven't established any sequence of events to force the problem to occur. It happens with engine hot or cold. You can hear fuel pump prime for 2 secs or so when key is first turned to ON. I had Holden connect a Tech-2 and it pulled no codes whatsoever.
I've replaced the following parts, one at a time in order, and driven the car:
1. Replaced Battery - problem still exists
2. Replaced Start and EFI Relays - problem still exists
3. Removed and cleaned IAC Valve and connection - problem stills exists
4. Replaced Crankshaft Angle Sensor - problem stills exists
5. Cleaned MAF Sensor - problem stills exists
6. Plugs and leads replaced - problem stills exists
7. Fuel injector petrol additive - problem stills exists
I know my pass-side intermediate muffler has a collapsed or loose baffle - expensive part to replace so not gone there yet.
Haven't replaced the IAC valve - again expensive to replace.
My current thoughts are that it could be:
- A fuel delivery issue (fuel pressure, clogged/dirty fuel filter, lines and injectors); or
- Some form of electrical issue or
- the intermediate muffler or
- the IAC valve
http://forums.justcommodores.com.au/images/smilies/idea3.gif Appreciate any suggestions or next steps to diagnose fault cause.
Thanks in advance.
I'm hoping someone can help me with an intermittent engine start then immediate stall issue. I have searched this site and found some useful posts/info which I have followed and replaced a number of parts as suggested by the posts but problem remains.
Car is a stock 2000 VTII Calias with GENIII 5.7L V8 engine. Engine has 190,000km on it. Regularly serviced. No oil leaks. Runs 98 octane fuel. Never missed a beat before.
Problem / Symptoms:
The engine will start normally on most 1st attempts without issues - just by turning the key.
Sometimes the engine will start normally on 1st attempt but with very low rpm that builds to normal idle rpm within a few seconds.
Randomly however, say one out of every 10 first start attempts, the engine will crank and kick-over normally, but then immediately stalls
Most times it will then start and run on next start attempt
Sometimes it may take several re-start attempts
When it does start:
- sometimes it starts with very low rpm that builds to normal idle rpm within a few seconds
- sometimes I've had to floor or pump the accelerator pedal on the re-starts to get the engine to run
- sometimes turning the key from ON to START does nothing on re-start, no fuel pump priming, or start soleniod clicking in (have to turn key all the way back to off before engine will crank again)
Once started and running engine appears to run normally. The only abnormal running things I've noticed are:
-Idle is a little rough - vibrations felt throughout the car (occurred before and after new engine mounts recently installed.)
-Under heavy acceleration power is not applied smoothly - engine hesitates then power surges. This hesitation/surge occurs from standing start, and at speed following auto-transmission-kick down.
-Generally I'd say power overall for a 5.7L V8 seems low to me, but it has done some miles now.
So problem is best described as an intermittent engine start then immediate stall issue. Problem occurs randomly - I haven't established any sequence of events to force the problem to occur. It happens with engine hot or cold. You can hear fuel pump prime for 2 secs or so when key is first turned to ON. I had Holden connect a Tech-2 and it pulled no codes whatsoever.
I've replaced the following parts, one at a time in order, and driven the car:
1. Replaced Battery - problem still exists
2. Replaced Start and EFI Relays - problem still exists
3. Removed and cleaned IAC Valve and connection - problem stills exists
4. Replaced Crankshaft Angle Sensor - problem stills exists
5. Cleaned MAF Sensor - problem stills exists
6. Plugs and leads replaced - problem stills exists
7. Fuel injector petrol additive - problem stills exists
I know my pass-side intermediate muffler has a collapsed or loose baffle - expensive part to replace so not gone there yet.
Haven't replaced the IAC valve - again expensive to replace.
My current thoughts are that it could be:
- A fuel delivery issue (fuel pressure, clogged/dirty fuel filter, lines and injectors); or
- Some form of electrical issue or
- the intermediate muffler or
- the IAC valve
http://forums.justcommodores.com.au/images/smilies/idea3.gif Appreciate any suggestions or next steps to diagnose fault cause.
Thanks in advance.