GZE intake

[mic*]

What i suspected was a cause was a restricted inlet. Ie; ABV is rooted.

Unplugging SC wont help unfortunately. Running it permanent, as i discussed the other week, might counteract my problem a little by pulling the air through what would otherwise be the restriction when it doesnt spin.

[Ben Wilson]

I've known mr2s to run without an ABV (blocked off) with no apparent ill effects (short term).

[Grant]

Actually Ben there is the same connection on the MR2 SC (VSV3) and in fact on all the 4AGZE’s. I think the best thing is for me to email you all the Toyota technical document that explains how the system works. It’s for the 4AGZE but it’s the same principle as the 1GGZE. All become clear once you read it.

Email me at work [email protected] and I’ll bounce it back to each of you.

Cheers.

[Ben Wilson]

I'm having a shocker today, I completely forgot there was a VSV in there. (must be lack of sleep 30 degrees at midnight last night).

Removing it made no appreciable difference to the car though.

[4agte]

just wanted to clarify something. Is your main problem that you are getting sluggish performance and less than satisfactory fuel economy?
.

[mic*]

just wanted to clarify something. Is your main problem that you are getting sluggish performance and less than satisfactory fuel economy?
.

Very much so. But not having owned or even driven a 1G-GZE powered car, i dunno exactly what to expect. With particular emphasis on the fuel economy. To the point where iv checked for leaks. Even when i drive that slowly that i try not to let the SC even kick in often - im still lucky to get much over 400km out of a 60L tank!

[Grant]

You haven't said what car it is. We have a 1GGZE Crown and we get 300km from 50l around town and just under 500km on the open road. These are really not the right engine for a heavy car. Much better in a Celica!

[c2888]

My car (ae86 with aw11 4agze) used some 45 litres for 20kms when i first swapped it into my car.

The engine never really got warm on my temp gauge, so i pulled out the thermostat, low and behold it was broken. So the engine was always in 'cold mode' chucking in heaps of fuel.

It was better at 350kms, but still not great. So i had a fiddle with the AFM (does a 1ggze have a flapper?), as it had been 'tweaked' for more fuel (loose flapper) So I untweaked it back to the original marks and it gets me 450kms to a tank easy now. I have no o2 sensor either.

Hope you find find your missing economy, if all fails i hear 1uzfes are good engines for big cars

cheers
dan

[DeftAnesthetik]

ABV stands for?

A.... Blow-off Valve?

I dont know its name, and i am assuming its purpose. Lets just say that is what its called. Now can anyone tell me if i am right, and how to check it with a multimeter...

ABV = anti backfire valve (function is as name implies.. althought i am not sure how it functions)
bov = bloww off valve,

all valves are by nature a bypass or shutoff

[Grant]

ABV = Air Bypass Valve

[mic*]

ABV = Air Bypass Valve

...and i cant beleive i wrote what i did at the start. Its been said a thousand times...

Lets hope we dont see any more fools sayin stupid shit like "blow-off"

[mic*]

So having received a bit of education...

I will check the air release on the ABV for blockages. i figure if its become blocked the VSV will not be able to trigger the ABV properly.

Apparently under medium engine speed & low load, the ABV will close, and force air to be drawn through the SC. This is basically to prevent shock loading on the clutch when it kicks in at higher revs as was said by grant. My understanding however is that the switching of the VSV and consequently the ABV is based on its own parameters and is NOT designed to do this each time as a precursor to switching the clutch.

Id like to know what rpm's this is exaclty as i suspect this is happening in 110 zones on the highway giving me shithouse economy - i sit on close to 3000rpm at 110 !!!

Does anyone know what the need (supposedly) is for a vacuum transmitting vavle before the VSV?

And also how can the operation & accuracy of the VSV be tested without a dyno coz all the switching parameters include a load based trigger?

[4agte]

Very much so. But not having owned or even driven a 1G-GZE powered car, i dunno exactly what to expect. With particular emphasis on the fuel economy. To the point where iv checked for leaks. Even when i drive that slowly that i try not to let the SC even kick in often - im still lucky to get much over 400km out of a 60L tank!

i was thinking it may well be a faulty knock sensor which is known to cause poor fuel economy and cause power to drop off after 5000 rpm.

[mic*]

Apparently that aint too abnormal on the economy front 4AGTE...

A bit depressing with the price of fuel at the moment, and the weight of my foot...

[4agte]

yeah the s/c's tend to drink the juice as you tend to be boosting all the time esp when taking off at lights andovertaking