Questions re 4L to 4.6L and more...

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Originally Posted by RSCHIPP

I'm starting to consider rebuilding options as well. It appears that I have a couple of exhaust valves on the way out and/or my cam is no longer the shape it should be...

The engine is at 261,000km, so with the engine out for a new cam shaft it is only a small step to pop out the pistons for new rings. At this stage I'm probably looking at the liners with the view to replacing... Where do you stop? Last time I went down this path with my 5L commodore I spent $4000 on a car that I later sold for $1,000.:o

Anyway, I discussed the 4.6 option with the guys at Lifestyle 4x4 and their recommendation is to get the NAS EMS and enable the 4.6 tune. The existing MAF sensor is good to go but the 4L EMS does not have enough fueling adaption to cater for the 4.6.

My plan is to keep driving the existing engine until things get a bit more pressing. Current symptoms are a rough idle (at low idle, fast idle is ok) and the random O2 sensor alerts, experienced as a single chime occasionally on start up. Hawkeye is also indicating a rough running signal on 3 cylinders. I have already replaced MAF sensor and O2 sensors chasing this, next step is heads of and new cam...

Watching this thread with interest.
Ron

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I recently had EXACTLY the same symptoms with mine.
Turned out to be air leaking past the injector seals. Replaced them and a faulty upstream O2 sensor, and back to normal. Mine has just ticked over 200k's

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Originally Posted by robertk61

I recently had EXACTLY the same symptoms with mine.
Turned out to be air leaking past the injector seals. Replaced them and a faulty upstream O2 sensor, and back to normal. Mine has just ticked over 200k's

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Thanks for the tip. Since I have been using 98ULP the random engine fault chimes have disappeared. I suspect that I may have had a sticking valve or two. The rough idle is better but still noticeable.

Cheers
Ron

Whats the word with enabling the 4.6 tune. Is it in the ecu as previously thought or does it need a new flash by the factory?

ALERT: Massive thread mine

After selling my mint but seriously gutless D2a HSE, I've bought another D2 V8 but with a manual and vapour injected LPG. Only cost me $4650!

I've got a new heart for it in my shed. A Ford 5.0L out of an AU Fairlane.

I've started stripping the Ford loom and ripped apart the motor to get it machined.

I'll be creating a thread in the projects section for more progress.

Discovery 2 (Ford)5L V8 with 5 speed and LPG. Watch this space!

Subsequent research shows the Motronic ECU is basically nonprogrammable with the exception on one person in the world. And it probably wouldn't run something else.

Quote:

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Originally Posted by robertk61

I recently had EXACTLY the same symptoms with mine.
Turned out to be air leaking past the injector seals. Replaced them and a faulty upstream O2 sensor, and back to normal. Mine has just ticked over 200k's

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As this has been dug up... I can report that in my case replacing the injector seals also stopped the air leaks and the V8 is back to normal.

Cheers
Ron

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Originally Posted by banarcus

ALERT: Massive thread mine

After selling my mint but seriously gutless D2a HSE, I've bought another D2 V8 but with a manual and vapour injected LPG. Only cost me $4650!

I've got a new heart for it in my shed. A Ford 5.0L out of an AU Fairlane.

I've started stripping the Ford loom and ripped apart the motor to get it machined.

I'll be creating a thread in the projects section for more progress.

Discovery 2 (Ford)5L V8 with 5 speed and LPG. Watch this space!

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Project now in serious doubt due to drowning the disco in the recent storms in the Hunter Valley. Now looking at doing a P38 instead.