Thread: 4.6 upgrade

A slight diversion - I am about to start assembling my 4.6. The only parts I still need to acquire are lifters, lifter pushrods and a timing chain and gears. Suggestions on the best place to buy would be appreciated.

Intending to use the old rockers as they are low km - any issues with this?

Thanks

Garry

Originally Posted by peter51

buy a cheap ODB reader and watch the voltage cycling whilst the engine is running.

any ideas on whats OK and what isnt?

Some pics of new headliner:

Quality work and honest price! - if you want yours done, I'll send you the guys number.

Pedro, are you asking how to check the O2 sensors are good.



Good O2 sensor
After warmup and idle or constant speed( low load - say 100km/hr)the O2 voltage should rapidly oscillate between 200mv and 800mv. Low voltage is lean and high is rich. This is closed loop ops. Signal voltage should switch between rich to lean or lean to rich in less than 100ms i.e Rapidly.

Bad O2 sensor - fixed voltage.
If the 02 sensor voltage is fixed lean (below 450mV), the PCM will severely richen the mixture. If the 02 sensor voltage is fixed rich (above 450mv), the computer will, severely lean-out the mixture. This will result in low power and hesitation problems.
In either case of fixed voltage, the Fuel trims will move to their max allowable limit and on reaching that programmed limit will log a code such as P0175.

Test at WOT
Test drive while watching 02 sensor millivolts at wide open throttle (WOT) At WOT all engines default open loop rich and the o2 sensor should show more than 800mv.— If the 02 drops lean (under 100mv) there is a fuel delivery problem. This is most commonly caused by a dirty mass air flow (MAE) sensor or a low fuel pressure/volume problem.

Originally Posted by garrycol

A slight diversion - I am about to start assembling my 4.6. The only parts I still need to acquire are lifters, lifter pushrods and a timing chain and gears. Suggestions on the best place to buy would be appreciated.

Intending to use the old rockers as they are low km - any issues with this?

Thanks

Garry

TRS in South Aus - not sure of other places in Aus, there are plenty overseas in the US and UK.

Originally Posted by peter51

My 2 cents worth. Dont change any sensors. Put the originals back on. Buy a cheap OBD reader and watch the voltage cycling whilst the engine is running.

You are wasting your money on aftermarket stuff which is generally poor quality.

All your Bosch components are designed or 1000's of hours of reliable operation unless the terminals have been affected by salt or coolant leakage ( Camshaft and Crank sensors normally) Hope you didnt spill any coolant on the terminals when you pulled it down.. If you did you need to neutralise it will EML spray( From Jaycar.)

Thanks Peter, can you recommend a good cheap obd reader? Haven't pulled engine out yet, but will make sure I check the terminals.

Originally Posted by peter51

My 2 cents worth. Dont change any sensors. Put the originals back on. Buy a cheap OBD reader and watch the voltage cycling whilst the engine is running.

You are wasting your money on aftermarket stuff which is generally poor quality.

All your Bosch components are designed or 1000's of hours of reliable operation unless the terminals have been affected by salt or coolant leakage ( Camshaft and Crank sensors normally) Hope you didnt spill any coolant on the terminals when you pulled it down.. If you did you need to neutralise it will EML spray( From Jaycar.)

Thanks Peter, can you recommend a good cheap obd reader? Haven't pulled engine out yet, but will make sure I check the terminals - cheers for the tip.

Ive tried a few from China and some software based programs including stuff for iphone and android, but nothing compares to the gear from black box solutions. I have the MSV -2. It s too expensive really - compared to their Nanocom.
Better one would be the Nanocom but u need to email to see if it can display raw data such as long and short fueltrims, O2 sensors raw voltage output and other PID,s. If you find out then post it here.
I dont know if the Nanocom can send this data stream to a PC - if it can then dont waste yr money on anything else. BBS have the best diagnostic tools for Landrover without question.