TD5 Mods

**HowardSmall** · 23rd March 2013, 01:16 PM

I have just carried out the EGR mod, fitted a new injector loom and replaced the MAF in the hope it would fix my intermittent low rev power loss. Sadly it did not...

However it did raise a couple of questions but before I write them I must point out I am not a mechanic so I may well be barking up the wrong tree.

When I pulled out the EGR plumbing it looked to me that the exhaust gas flowing to the inlet manifold is controlled by a vacuum valve. If that is the case why replace the plumbing? Why not simply stop the valve opening by controlling the vacuum? (That would have stopped me shearing off one of the two bolts that now have to hold the blanking plate in place and thus saved me a large bill from the local repair shop)

The flow of oil to the ECU via the injector loom is not going to be stopped by replacing the loom. Looking at the new one it is simply some wires held loosely in a plastic duct in which oil can enter freely. The weakness in the system appears to be the ability of the oil to flow via the plug/socket connecting the injector loom to the external loom. The two O rings stop it flowing past the plug so the oil has to seep past the contacts or flow through the contacts to get to the external loom. Eventually the problem will recur. Has anyone ever tried to address the flow at that point to make a permanent fix?

Final question. When I unplugged the loom from the injectors I saw that the injector socket had heaps of oil in it. Does this have an effect on performance?

Howard

**slug_burner** · 23rd March 2013, 01:34 PM

I think the effect on performance occurs once the oil makes its way to the ECU. There it has effects such that the engine will not rev to its full range and will not go much past 2500 rpm.

There is not much worth doing to the loom given the oil makes its way inside the individual wires via capillary action.

The reason for removing the EGR valve is to remove the aerodynamic blockage to the inlet airflow therefore improving the breathing efficiency of the engine.

**goingbush** · 23rd March 2013, 05:27 PM

Originally Posted by slug_burner

<snip>

The reason for removing the EGR valve is to remove the aerodynamic blockage to the inlet airflow therefore improving the breathing efficiency of the engine.

incorrect, it is to stop dirty exhaust gasses being passed back through the intake system, stops the inlet manifold and inlet tract being coked up with soot and gunge , improved airflow is a bonus but not the reason.

**HowardSmall** · 23rd March 2013, 05:35 PM

He was replying to my question as to why it is necessary to remove the EGR plumbing instead of simply disabling the vacuum control and thus stopping the exhaust gases flowing to the inlet manifold.

Howard

[QUOTE=goingbush;1880690]incorrect, it is to stop dirty exhaust gasses being passed back through the intake system, stops the inlet manifold and inlet tract being coked up with soot and gunge , improved airflow is a bonus but not the reason.[/QUOTE]

**nedflanders** · 23rd March 2013, 08:09 PM

I replaced the injector loom 12 months ago and have regularly checked the plug at the head and seen no oil reappear their, however I am still cleaning the red plug at the ECU as there is still oil appearing there, all I can think of its residual as it is getting less. I take it you have cleaned the ECU when you changed the loom? Also the EGR is removed as any restriction in the intake can't be that good, especially as it isn't being used anymore.

**BilboBoggles** · 23rd March 2013, 08:27 PM

Another mod to consider, disconnect the sensor on the clutch pedal. Amazing the difference in performance, no more 2nd gear sluggishness.

**djam1** · 23rd March 2013, 08:38 PM

Another reason to remove the EGR is it falls apart and ends up in cylinder no1
The end result is usually a new block

Are you sure the intermittent low end torque loss isn't turbo lag?
Is it more prevalent on warm afternoons and never there on a cool morning?

**Chilly** · 23rd March 2013, 09:03 PM

Originally Posted by BilboBoggles

Another mod to consider, disconnect the sensor on the clutch pedal. Amazing the difference in performance, no more 2nd gear sluggishness.

First time I have heard this one...how come this works...and how good

**slug_burner** · 23rd March 2013, 10:55 PM

Originally Posted by goingbush

incorrect, it is to stop dirty exhaust gasses being passed back through the intake system, stops the inlet manifold and inlet tract being coked up with soot and gunge , improved airflow is a bonus but not the reason.

Might help if you read the answer in the context of the question.

**mools** · 24th March 2013, 01:22 AM

Originally Posted by BilboBoggles

Another mod to consider, disconnect the sensor on the clutch pedal. Amazing the difference in performance, no more 2nd gear sluggishness.

Year never heard of this too. How is disconnecting the clutch switch beneficial? I thought the purpose of the switch was to kill the revs once the clutch was disengauged.

Bilbo, can you elaborate?

Also, I have wired up a cruise controll and I know it cuts out if the clutch switch is operated, if the switch is disconnected then will it affect the operation of the cruise function at the ECU?

Cheers,

Ian.

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