Quote:
Originally Posted by abnfto  Hi Clint, you look like a bit of a turbo expert!
I was wondering, what sort of boost pressure would you expect to see from a standard 3CTE engine and turbo . I fitted a boost gauge to mine last weekend and am seeing 5-6 psi under typical cruise conditions. If I floor the accelerator from 50mph and the engine revs hard, the maximum I have seen is around 8.5psi. I don't see much boost at all at lower speeds / revs.
The reason I ask is that under acceleration there is a lot of black smoke (poorly burnt fuel) coming out of the exhaust and I wondered if the turbo boost was low such that the fuel to air ratio was higher than it should be. On my petrol engined cars, the Air Flow Meter would compensate for low boost but I haven't spotted such a meter on the Estima so I presume the amount of fuel injected is based mainly on throttle position and coolant / air temperature readings.
Thanks for any help, Robert. |
Hi Robert, there are great number of things that will cause a diesel to smoke..
Your boost is on the sweet spot for the toyota manual. It states 7~9psi.
Smoky reasons
Dirty or out of adjustment injectors or pump
Dirty air filter
Stuffed water temp, map or air temp sensors.
Buggered EGR valve( do a search on here for that one)
My first best guess would be to make the egr inoperative.
Then look at the injectors for a service.. Or try some injector clean through them...
The map sensor will only add more fuel as boost comes on unless of course the sensor is faulty and reading high but this is at the far end of the spectrum. Electronics seem to always outlast mechanical components so the injectors would be the likely culprits..
Clint