Td4 obd readings help please

At the Freelander AGM a few months ago I recorded a fellow Freelander owners Td4 wiv me hawkeye:

Freelander 1 Td4 HawkEye Diagnostic ECM EMS DDE 4.0 Live Data. Engine Off. Engine Warm - YouTube


Freelander 1 Td4 HawkEye Diagnostic ECM EMS DDE 4.0 Live Data. Engine Running & Warm - YouTube


Freelander 1 Td4 HawkEye Diagnostic ECM EMS DDE 4.0 Live Data. Engine Warm Travelling at 15 to 35mph - YouTube


Freelander 1 Td4 HawkEye Diagnostic ECM EMS DDE 4.0 Live Data. Engine Warm Travelling at 15 to 35mph - YouTube

Have been reading this thread from earlier this year..I have 2006 TD4 with a similar issue.. I also have air inlet temp in the front turbo hose. I have recently replaced my Bosch MAF with a pierburg attached to a synergy2a.. My question is..does the pierburg record the inlet temp or does the temp sensor in the turbo hose.. or both.. The pierburg MAF will not work with correct settings on the synergy2a.. Poor pickup until turbo kicks in..

My question is..does the pierburg record the inlet temp or does the temp sensor in the turbo hose.. or both.

Click to expand...

i reckon .. the temp sensor in the turbo hose

some where on the site .. there's mention of air temp. sensor regarding the synergy+p.maf
Tuning-diesels for low cost diesel tuning.

The pierburg MAF will not work with correct settings on the synergy2a.

Click to expand...

did you buy the synergy new? .. i.e. you have access to the instructions
( although i think those are on his site as well )
the settings knob Is fitted correctly ? i.e. hasn't come loose and been refitted incorrectly

do you have an egr 'bypass/delete' fitted ?

Poor pickup until turbo kicks in.

Click to expand...

well .. it would do .. as there's not much airflow 'till turbo kicks in ..
turbo adds boost from about 1300rpm .. but .. even with foot-on-floor
pickup-power doesn't really Start to 'happen' till about 2300rpm ( aprox.)

just my observations
( a.f.a.i.k. mines in a good state of tune and running well )

besides "Poor pickup until turbo kicks in" be subjective ..
sort of like 'one persons music is another persons noise'

'pickup' going to depend on gear / speed / rate of go-pedal movement
and .. at what rpm the go-pedal is 'floored' .. or 'near-floored'

and obviously state of air-filter .. injectors .. pumps ..
and general state of mechanical wellbeing .. cylinder compression .. etc etc .. & etc ..

~~~~~~~~

be a thread somewhere on the lz-freelander section .. ( try a search )
where ppl recorded their 50mph to 70mph times .. in 5th gear
so .. aprox .. from 2000rpm to 2800rpm ..
times with synergy were roughly 4 or 5 seconds

btw: the pierbug maf has a slightly different voltage output than the bosch maf
http://tuning-diesels.com/75Zt/R75maf.htm

i found that the pierburg maf made the engine feel a tad weak .. pickup wise .. at lower rpm
i.e. when compared to the bosch maf ..
but it were only a very very slight difference ..

and tbh: get-up-and-go on mine can literally depend on which pair of shoes or boots i'm wearing ..
sounds silly .. but it's true ..
bought some winter boots recently .. a fair bit less supple than my regular driving shoes ..
thought they would lead to heavy-right-foot .. but no .. just the opposite
to get right-foot-down for go-go-go overtake response .. needs a conscious effort on my part

~~~~~~~~~~~~~~~~
added : as another note regarding turbo response .. see post no.5 here :
http://www.landyzone.co.uk/lz/f9/vacum-hose-turbo-210056.html#post2320441

Thanks HD3... Lets try and give you some more infol

TD4 2006 65k miles. Regular servicing.
Synergy2a is 2 yrs old fitted from new using existing Bosch MAF.
Have been running it on setting 2.. Throttle response, pickup, acceleration and top end have been brilliant.. Economy ~35 mpg. EGR is a retrofit blank and vac pipe is sealed off.

Month ago the engine management light came on an engine went into limp mode ~2500rpm. We borrowed an ODB2 reader. No codes came up but having read several landyzone found useful thread giving fuel rail and pump pressures..enough info with diagnostics to determine fuel pump in front of rear OS wheel was low on pressure. Replced pump with OEM and filter. Engine revving freely again, engine fault cleared, and driving as well as before. Thought this was the result..

Following morning, driving into work, engine seemed to lose top end above 70mph, no warning lights, and bottom end power and response up to 1500rpm very sluggish and poor. Mid band power was average..

Disconnected MAF and top and bottom end power and response returned. Considering several other threads and checks I concluded the MAF had died. Decided to get a pierburg 070 to compliment the Synergy2... Installed few days later and set Synergy to 7. Installed made no difference and still had poor bottom power and limited top power.

Have since been checking other sensors..
I have an ODB2 Vegate monitor but does not give the fuel pressures

(Readings below are for 780rpm/1500rpm/3000rpm/4000rpm)
ETC (degC) (73/74/73/72)
MAP (KPa) (100/106/145/198)
IAT(degC) (22/22/22/23)
MAF (g/s) (12/30/89/124)

Fuel high pressure sensor. Being unable to monitor this on my ODB I have measured the voltage on the sensor. At tick-over this was 1.25 volts and at 3000rpm 3 volts. This appeared to compare with measurements on another landy thread.

Boost solenoid and turbo variable vane actuator. Have checked all vac pipe work and vent filter for leaks. Removed and checked solenoid operation using independent 12v supply and vacuum supply. Checked turbo actuator using separate vacuum supply. Replaced an checked actuator operation in situ appeared to move ok with increase rpm.

Without the MAF connected the turbo can be heard spooling up, engine free revs to 4k rpm and on the road has good power. Based on this assume that injectors, injector pump working ok.

What next??

hi can you feela small misfire when driving?

Hi Schultz.. Can't say I've noticed a misfire with the MAF connected as power is pretty poor. With MAF disconnected runs ok.. No misfire..

i did a injector leak off test and found that 1 and 4 was leaking back to much.
also there is a small filter down the back left of the engine that is a air filter for the turbo switch mine was blocked.

'AQM' .. re:

What next??

Click to expand...

perplexing situation .. given you rekon all is well re injectors and fuel supply ..

i was reading thru some of the 'tuning diesels' pages ..
i got the impression that disconnecting the maf .. while allowing the engine to run ok ..
it could also cause it to overfuel ..

anyhow .. i'd take the following steps .. :

check that the connector from the synergy to the maf wasn't accidently put on the wrong way round
( the synergy fitting instructions imply that could happen if the maf connector is not o.e.m. )

check that the synergy maf switch is turned 'on' ( obvious i know .. but trying to cover any 'ooops'

given the ammount of rain recently .. and the td4's known weakness of water ingress to the injector wiring harness
check for dirty/corroded connectors .. in particular the 'fuel rail pressure sensor '
no idea If that particular sensor would cause the problem/symptoms you have .. but worth checking
as it's know to cause a variety of symptoms ..
using 'contralube' on the electrical connections be a good idea as it will fight off corrosion
( it's a dielectric grease .. available from 'maplins' .. )

check it's not the synergy unit itself ..
some people noted green-corrosion inside the older versions ..
no doubt .. that will depend where the unit is situated 'n how well it's protected from rain water ingress ..
i guess that means trying the motor with the synergy disconnected/removed ..
which means having to re-install .. or replace .. the bosch maf .. :-/ .. ..

Maybe the old bosch maf Is ok .. given the fault could lie elsewhere ..
could be that .. it just could do with cleaning ..
( degreasing the air-passage with 'gunk' spray .. then alchohol electrical cleaner spray .. might work )

( googling "testing a bosch maf" seems to bring up a variety of methods and opinions
( as to whether the methods are viable or not ..

i suppose If it means buying a new bosch maf .. maybe not a bad idea to have one spare
in case the synergy unit itself becomes ( or proves to be ) faulty ..

re:

(Readings below are for 780rpm/1500rpm/3000rpm/4000rpm)
ETC (degC) (73/74/73/72)

Click to expand...

engine coolant temp? .. seems ok .. i've only got a 'scangaugeII' .. my coolant temp reads a constant 83C .. on road

MAP (KPa) (100/106/145/198)

Click to expand...

my comp. don't have a KPa conversion .. didn't google for a conversion table .. but f.w.i.w.
.. my map runs between 14.9 psi to 28psi .. on road ..
think i once spotted it at 30psi when overtaking .. but i was too busy keeping eyes-on-road .. to be sure

IAT(degC) (22/22/22/23)

Click to expand...

mine runs similar depending on outside temps 'n how much go-pedal i'm using ..

MAF (g/s) (12/30/89/124)

Click to expand...

can't comment as i've no way of reading mine ..

Can't say I've noticed a misfire with the MAF connected as power is pretty poor. With MAF disconnected runs ok.. No misfire..

Click to expand...

i guess that probably rules out corroded connectors on the fuel-rail sensor and injectors ..

Thanks Hd3

Your MAP 15 to 30 psi convert to 103KPa to 206 KPa which compare to the readings I am achieving. So. Am guess the MAP is working ok.

I am going to carry out suggestion of checking the injectors tho I don't think this is the problem.

Agree on the synergy unit advice, and am sending unit back along with pierburg and Bosch MAPs for roverrons test service. Need to start eliminating parts.

Will keep you updated..