Thread: Rev limiter / boost controller

Checked for oil in the loom at the ecu? Throttle problems are often caused by this.

Ediit: Why do you stop to restart the engine?

Thanks Graeme, I'm just about to go and check on the ECU / oil issue and will let you know.
Why did I stop - the first time it happened it took me by surprise and I didn't have a clue what was going on, second time I just slowed down and restarted. Been driving more conservatively ever since.

Cheers
Nick

Almost certainly going into limp mode after overboosting. Does the Check engine lamp come on? The key here is to check your max boost and it should be around 20psi. The wastegate DOES get sticky on these too, and will cause the same symptoms in standard vehicles. Try moving the wastegate actuator with a pair of vicegrips, it should move OUT towards the back of the engine. It will be hard to move against spring pressure but should spring back easily. If in doubt, soaking the pivot shaft liberally with penetrants like CRC and Inox overnight should free it up. If the wastegate is free, and it is overboosting, you can adjust the wastegate by lengthening the rod a few turns to prevent it happening. Don't go too far as doing this will reduce performance A boost gauge is a MUST HAVE when diagnosing/ rectifying these type of faults. (An EGT gauge would also be of some merit with a modded Td5...)


JC

JC,
When my D2 overboosted due to a failed modulator, the throttle still worked but there was fuel cut-out when the boost was excessive. Does the Defender (not having the boost modulator) react differently?

Thanks for the info JC, yes the engine check lamp did illuminate. Just checked the ECU and low and behold it's well lubricated so I'm gonna have to rectify that first but I shall be checking on the waste gate while awaiting parts.

Thanks to all
nick

Originally Posted by Graeme

JC,
When my D2 overboosted due to a failed modulator, the throttle still worked but there was fuel cut-out when the boost was excessive. Does the Defender (not having the boost modulator) react differently?

ide say its the same, the defer overboosts and cuts power by using a defult fuel map that limits the fuel delivery, its still drivable just not very resopnsive. as said, turn the ignition off then on and it self resets.

cheers phil