Freelander 1 TD4 intake flowpath

Still working on my TD4 issues with lack of power with MAF connected and dropping into limp mode, so far

• 3 x diagnostics , only code was injectors but one showed a possible issue with cylinder 3
  
• 2 replacement (refurbished) injectors
• New MAF (bosch)
• removed intake manifold and cleaned
• cleared EGR
• checked compression through glowplug holes...1.400psi 2.420psi,3.410psi,4.430psi
• checked all vacuum to reseviour to EGR to solenoid to turbo and vacuum is good
• checked solenoid and turbo actuator and both are functioning...

while changing the injectors I cleaned ot the engine intake (not the manifold) using a vacuum and noticed I can feel the vacuum pulling thoruogh the lower intake on cylinder 4 tangential (square) port when sucking through the upper intake swirl port (round) and the same when sucking through the injector bore but get no communication on any of of the other 3 when I do this...is this an indication of a blockage somewhere?.. does anyone have a drawing of the intake flowpath below the manifold?. trying to eliminate this before looking at the turbo

The reason you could feel vacuum on just No 1 was because the inlet valves on that cylinder were open while the other 3 were all closed. It's completely normal and wouldn't be the cause of your issue.

Does it run OK with the MAF unplugged?

Hi Nodge,
been running i with the MAF unplugged for over a year and recently bought a Freelander 2TD4e so looking to sell it on if I can run it as it should with the MAF connected

bfgquinn said:

Hi Nodge,
been running i with the MAF unplugged for over a year and recently bought a Freelander 2TD4e so looking to sell it on if I can run it as it should with the MAF connected

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is there such a thing as a cause effect document showing the various scenarios where limp mode is activated?

bfgquinn said:

Hi Nodge,
been running i with the MAF unplugged for over a year and recently bought a Freelander 2TD4e so looking to sell it on if I can run it as it should with the MAF connected

Click to expand...

It sounds like the EDC has calibration it's self to run well with the MAF disconnected. So when you plug it back in, it's assuming something is amiss. I'm not sure if the adaptation is that smart, but it's a possibility.
Do you know anyone nearby that might be able to clear any EDC adaptive values set in error?

Nodge68 said:

It sounds like the EDC has calibration it's self to run well with the MAF disconnected. So when you plug it back in, it's assuming something is amiss. I'm not sure if the adaptation is that smart, but it's a possibility.
Do you know anyone nearby that might be able to clear any EDC adaptive values set in error?

Click to expand...

i have a local guy who can delete all historical codes, ill ask about the EDC adaptive codes , if the MAF is disconnected then when you reconnect the MAF the fault code remains and sometimes this can cause issues apparently

bfgquinn said:

i have a local guy who can delete all historical codes, ill ask about the EDC adaptive codes , if the MAF is disconnected then when you reconnect the MAF the fault code remains and sometimes this can cause issues apparently

Click to expand...

while i wait on a diagnostic appointment next week I had a look at the vacuum system, theres still vacuum all the way to the turbo so with the MAF installed I bypassed the solenoid and went straight to the turbo from the air reserviour, then I drove up the hill outside my home for about a mile and a half without any incident...i realise limp mode is trying to protect the engine by limiting boost but maybe this shows no issues with the turbo as it was doing what it should and possibly this is a solenoid issue?

Nodge68 said:

It sounds like the EDC has calibration it's self to run well with the MAF disconnected. So when you plug it back in, it's assuming something is amiss. I'm not sure if the adaptation is that smart, but it's a possibility.
Do you know anyone nearby that might be able to clear any EDC adaptive values set in error?

Click to expand...

seems my tD4 uses a Diesel EMS called Bosch DDE4, the older 2001TD4 uses the EDC 1.3.1, been away for a while and havent had the diagnostic check that can fix any adaptive values, the last diagnostic showed no faults but i replaced the boost solenoid and still have the same issues...yesterday i tried an OBD2 diagnostic with the MAF connected and a Torque app and it showed no faults though the live data shows vacuum at 1.3in/Hg when static and rises to around 7 psi when moving even uphill i need to be at 2500 rpm to get any acceleration

7 psi is very low for a boost pressure. 18 psi would be more what I'd expect to see.
Have you checked the condition of all the vacuum pipes. Especially the long one that goes over the top pf the engine. The vac pipes do perish and split with age. Leaks in the vacuum circuit prevents the boost solenoid from working correctly.

Well I've passed my TD4 to my brother,still running ok with the MAF disconnected, have had 2 diagnostics at my local mechanic and his with no codes shown...still loss of power on hills with the MAF connected.no one seems to know what this is...with the MAF the turbo kicks in over 2000psi I'm told this model should be around 1500psI.I've had the turbo checked,vacuum checked and they are doing what they should...could it simply be the ECU telling the turbo to kick in at the wrong pressure?