Thread: TD5 Question

Could be oil in the injection harness. Do a search on this site as there are specific threads on the issue.

sounds like my old starlet turbo that had an overboost cutoff, to much boost would shut the engine down for 1/4 secod and boost would drop instantly as engine shut down, then all back to normal until to much bost again.

dunno if the td5 has overboost protection, just a guess.

Originally Posted by Rosscoe68

sounds like my old starlet turbo that had an overboost cutoff, to much boost would shut the engine down for 1/4 secod and boost would drop instantly as engine shut down, then all back to normal until to much bost again.

dunno if the td5 has overboost protection, just a guess.

This certainly occurs on TD5s when the boost modulator dies in the 'allow more boost' position. A typical indication is using wide throttle around 2500rpm the problem occurs but will rev right past on light throttle.

The TD5 ecu does have overboost protection.

Does it cut out relative to boost levels or revs? If its rev related, you can probably discount overboost. From tickover in 3rd, when you boot it you should reach max boost within a short while, Im guessing that would make it judder????


Has the wastegate arm ever been adjusted to give more boost? Or is it normally driven very gently?

When the inlet manifold sensor detects an increase in pressure (more than the prescribed limit) it will automatically cut off the fuel until the boost pressure reduces to within acceptable levels. Giving the on-off-on-off scenario.

Over here in the UK a common cause of that is a sticking wastegate. A penetrating/releasing agent sprayed into the butterfly housing and generous working backwards and fourth may solve the problem... Other rectifications are a replacement turbo or get jiggy with the angle grinder, release and braise back up - they are supposed to be a non servicable butterfly. I have fixed 2 now with penetrating oil and a generous working.

try this...

test it a couple of times and see if it happens at a certain throttle position.

change into low range and see if it still happens in the same throttle position.

if it happens at the same pedal position every time then its the throttle position sensor.

If it happens at the same RPM's/load/boost and the pedal position changes then it could be a faulty MAF, dodgy connection thats breaking at a certain vibration oil in the harness or any number of other things..

Thanks guys will pass ypur thoughts on and see what we can find, fingers crossed, will keep you updated

I had exactly the same thing with mine and it turned out to be a sticking wastegate. Only did it under load or when accelerating hard. Quick lube and all back to normal.

Hope you sort it

Thanks mate, just spoke to my mate, he says that when he is sitting in the car out of gear, as he revs the engine and gets to 1200 rpm then it just goes back to idle then he sqeezes the throttle and gets to 1500 rpm and does the same goes back to idle and he says the engine light has come on, so it looks like a trip to the mechanics, so we should be able to find out what it is doing now.