Td5 revs at will.

[bullfrog]

Hi all, Just wondering if anyone has experienced a similar issue. Pulled up at work the other day and as I've rolled to a stop and depressed the clutch, the revs shot up to about 3000 for around 2 or 3 seconds. Twas a scary moment. Incase its age or model specific, we're talking '99 D2 td5.

[Disco Muppet]

There's been a thread about similar symptoms quite recently, have a squiz in either the disco or defender sections, most likely the same issue.

[northiam]

It may be Engine running on its own oil

Danger!!!!

http://www.aulro.com/afvb/general-chat/109383-runaway-td5.html

[bullfrog]

Pretty sure I can rule that one out thanks Northiam. Oil level is fine & no blue smoke. No smoke at all thank god.

[Blknight.aus]

no, you cant, it can still be the turbo seal, of course It could also be a noisey TPS track.

For peace of mind I would be pulling the turbo-intercooler hose and eyeballing it.

[bullfrog]

Dave, I'm still pretty sure the old girl is not taking a sly slurp of texas tea. Any oil burnt, regardless of its origin will result in blue smoke. Also, given this so far is a one off incident, I'd be leaning toward your 2nd option. So, what is a noisey TPS track?

[Disco Muppet]

TPS is throttle position switch, so I'm guessing some sort of interference with that :)
That's the limit of my electrical knowledge unfortunately :p

[Blknight.aus]

Dave, I'm still pretty sure the old girl is not taking a sly slurp of texas tea. Any oil burnt, regardless of its origin will result in blue smoke. Also, given this so far is a one off incident, I'd be leaning toward your 2nd option. So, what is a noisey TPS track?

not always... have a look at MEN oil burning heaters.

muppets on the money, the TPS is essentially just a variable resistor usually its failure method is a dead spot in the throttle but theres no reason a contaminated one couldn't throw a high rpm request.

[bullfrog]

Fair enough Dave, thanks to all for the feedback. Next question, will an early nanocom pick up a fault in the TPS.

[dswatts]

I seem to remember reading something about a faulty clutch switch causing a similar issue??

[Blknight.aus]

yes, plug it in monitor the driver demand, throttle position or throttle value (whichever one of those they called it) and operate the throttle with the ignition on but the engine stopped) if it doesnt move smoothly through the range then you have a TPS problem.

the faulty clutch pressure switch from memory would cause the engine to be lethargic in pickup after a gearchange or flaring on gear chang.

[bullfrog]

Thats great, gives me something go on. BTW HFD.

[Fluids]

RAVE 18-1-27

The clutch switch is located at the rear of the engine compartment on the RH side. The switch is operated by hydraulic
pressure when the clutch pedal is pressed. The ECM uses the signal from the clutch switch for the following functions:
l To cancel cruise control if operating.
l To provide surge damping during gear change.
Surge damping stops engine speed rising dramatically (engine flaring) during gear change. Surge damping assists
driveability as follows:
l Smoother gear change.
l Greater exhaust gas emission control.
l Improved fuel consumption.
Input/Output
The clutch switch receives battery voltage from the BCU. With the clutch pedal in the rest position the switch is closed,
allowing battery voltage to pin 35 of the ECM connector C0658. When the clutch pedal is pressed the switch contacts
open, interrupting the power supply to the ECM. The ECM receives 0 Volts.
The clutch switch can fail in the following ways:
l Switch open circuit.
l Short circuit to vehicle supply.
l Short circuit to earth.
In the event of a clutch switch failure the ECM will react as follows:
l Surge damping will be inactive.
l Cruise control will be inactive.

[bullfrog]

Thats awesome, thanks Kev.

[Fluids]

You're welcome !

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[bronson]

Try bridging out the clutch switch with some wire, if it stops engine rev flare ups between gear changes, replace it, it also happened with mine.

cheers
bronson