Hello,
re primera 2ltr petrol p11 model 97 99.
use part number off Hitachi maf, end’s 200, same part!
later maf, Bosch has inlet temperature sensor as well, hence extra wires on connector.
I haven’t tried it, but I do wonder if it may be possible to retro fit a Bosch on the Hitachi system, ignore the inlet temp sensor, on VW, a get you home mod is to fit a diode between VE and output to ecu, fools ecu in to thinking maximum airflow at all times, black smoke a bit at low revs, but fine at high.
Butterfly device is unit between output of intercooler and inlet manifold, looks like a metal cylinder with flap attached.
If you remove this, you can access inlet manifold without complete removal, have a poke around and see if it is gunged up.
The manual explains the throttle valve system, but to simplify, the egr vale opens and forces in exhaust gas, so clean intercooled air is not need, so flap closes, the flap operates on a vacuum from the passenger side of engine, and sort of seesaws with egr, egr fully open, flap fully closed, egr vale half open, throttle valve half open.
So if the egr is disabled, when the ecu thinks it is opening it, it closes throttle valve, thereby removing oxygen to enable combustion.
Totally agree about working diesels hard, we have a fleet of 57 plate new X-trails, mine was pushed hard for last 120,000 miles, no real issues, two are permanently sited at Manchester airport, and just pootal around, they are forever having to be returned to Nissan to have the soot particulate filter/canister removed and cleaned.
Nissan at first suggested taking them for a “thrash” but this proved not to work.
The first pictures I took of all gunge in inlet didn’t come out (my fault oily thumb print!)
But the ones of blanking plate, and inlet after clean were ok, will try and attach.
Also included a picture of what the gunge looks like, I got a huge amount out, maybe 2lbs, this has made a huge difference to performance, the inlet ports were reduced by about 90%.
I have a feeling the cause is over cooling, seems the viscouse fan is u/s on mine, on multigrade oils, the engine needs to get hot to attain the heavier SAE rating, so blowby oil vapor could well be due to overcooling, I have fitted a new “Nissan” oil catch tank, why do Nissan charge so much for this? Managed to find a supply of them at about a 10th of the cost of Nissan.
Anyway, what appears to be heavy breathing from rocker, all but stops when I got engine up to temp, by stopping fan manually, checked temperature with external gauge all was fine within spec, and as I say, blowby gone.
So back to gunge in inlet, it is a by product of the oil blowby vapor and the soot from the egr system.
To be honest these egr’s are pretty basic, now all egr’s have egr cooling systems, as pointed out before, why have an intercooler and then bang hot exhaust gas in??
Daft, but then an American thing, so…..
Oh, I still think your problem will be maf.
I have also attached a picture of outlet on my diesel pump, does this look like the banjo you all seem to see on the inlet? Remove internal screw that you see at end, inside is or was a spring, ball and filter, I cant see the reason so I removed, but I have put in a one way valve in the pipe now.
Hope you get sorted.
re primera 2ltr petrol p11 model 97 99.
use part number off Hitachi maf, end’s 200, same part!
later maf, Bosch has inlet temperature sensor as well, hence extra wires on connector.
I haven’t tried it, but I do wonder if it may be possible to retro fit a Bosch on the Hitachi system, ignore the inlet temp sensor, on VW, a get you home mod is to fit a diode between VE and output to ecu, fools ecu in to thinking maximum airflow at all times, black smoke a bit at low revs, but fine at high.
Butterfly device is unit between output of intercooler and inlet manifold, looks like a metal cylinder with flap attached.
If you remove this, you can access inlet manifold without complete removal, have a poke around and see if it is gunged up.
The manual explains the throttle valve system, but to simplify, the egr vale opens and forces in exhaust gas, so clean intercooled air is not need, so flap closes, the flap operates on a vacuum from the passenger side of engine, and sort of seesaws with egr, egr fully open, flap fully closed, egr vale half open, throttle valve half open.
So if the egr is disabled, when the ecu thinks it is opening it, it closes throttle valve, thereby removing oxygen to enable combustion.
Totally agree about working diesels hard, we have a fleet of 57 plate new X-trails, mine was pushed hard for last 120,000 miles, no real issues, two are permanently sited at Manchester airport, and just pootal around, they are forever having to be returned to Nissan to have the soot particulate filter/canister removed and cleaned.
Nissan at first suggested taking them for a “thrash” but this proved not to work.
The first pictures I took of all gunge in inlet didn’t come out (my fault oily thumb print!)
But the ones of blanking plate, and inlet after clean were ok, will try and attach.
Also included a picture of what the gunge looks like, I got a huge amount out, maybe 2lbs, this has made a huge difference to performance, the inlet ports were reduced by about 90%.
I have a feeling the cause is over cooling, seems the viscouse fan is u/s on mine, on multigrade oils, the engine needs to get hot to attain the heavier SAE rating, so blowby oil vapor could well be due to overcooling, I have fitted a new “Nissan” oil catch tank, why do Nissan charge so much for this? Managed to find a supply of them at about a 10th of the cost of Nissan.
Anyway, what appears to be heavy breathing from rocker, all but stops when I got engine up to temp, by stopping fan manually, checked temperature with external gauge all was fine within spec, and as I say, blowby gone.
So back to gunge in inlet, it is a by product of the oil blowby vapor and the soot from the egr system.
To be honest these egr’s are pretty basic, now all egr’s have egr cooling systems, as pointed out before, why have an intercooler and then bang hot exhaust gas in??
Daft, but then an American thing, so…..
Oh, I still think your problem will be maf.
I have also attached a picture of outlet on my diesel pump, does this look like the banjo you all seem to see on the inlet? Remove internal screw that you see at end, inside is or was a spring, ball and filter, I cant see the reason so I removed, but I have put in a one way valve in the pipe now.
Hope you get sorted.
