Sudden increase fuel consumption V6
My VY V6 wagon has suddenly had a around-town fuel consumption spike.
When driving in peak hour traffic exclusively, average speed around the 30s km/h, it never goes above 17.4l/100km - which it does often, as it usually is stuck in traffic. But that's the worst ever.
On holidays on the freeway, loaded up doing 110km/h, it'll do 9.2l/100km, and I'm sure I've seen high 8s once or twice on the computer when driving slower.
In town, when not peak hour, it'll get about 13-14l/100km average.
So I got a 120,00km service the other day, new plugs and filters, throttle body clean and injector cleaner put in, and now the consumption has shot up to 20.5l/100km around town! I did a trip on the M2 yesterday, reset the computer and for the M2 and the suburbs trip home its average was down to 9.2l/100km.
So it can do decent economy, but to me the performance seems down on what I thought it was capable of. It feels relatively gutless,tho cos I don't drive every day maybe that's just what its like.
Anyone experience these symptoms? Could it be a warm-up sensor failure? MAF sensor? I'm thinking idler pulley is out cos it still does okay for economy on an open road run
The Only 6sp VZ Wagon
when you reset the computer all the time it will give you high readings due to the fact it is calculating more often to form the new average, which in your case is around town so expected,
if you leave it alone to do its thing, go for a few long distance touring, give it like 2-3000km to form a decent average to build up, the figure after that time will be pretty close to on the spot
EASTERN CREEK JCNSW 2009
Originally Posted by Commydoor
remember the gen 3 rattle saga????
well my VY, ever since new, i could hear a rattle in the engine coming from the lower half of the engine.
i think that since the engines are being exported to the desert countries, they are making the engines looser so they can cope with the heat (due to expansion and contraction). this in turn makes the engine prone to inefficiency, thus creating higher fuel consumption and lower power output.
the best experience with the 3.8L imo was in the VT. smooth torquey, quiet and fuel efficient under normal driving conditions.
since a rebuild is out of the question, all i can suggest is a piggyback computer and/or light supercharging (with a dyno tune), maybe a silent drive charger with no more than 4psi, thus not requiring an intercooler.
the biggest difference from vt to vy engines is the exhaust manifold. Im pretty sure the vt had 3 into 2 pipes where as vy has 3 into 1 before joining up at the firewall....correct me if im wrong.
Last edited by yeeros; 18-12-2007 at 04:18 PM. Reason: just a final thought
RAPTR6
No truth in that, all manufactured to same tolerance for all placesi think that since the engines are being exported to the desert countries, they are making the engines looser so they can cope with the heat (due to expansion and contraction). this in turn makes the engine prone to inefficiency, thus creating higher fuel consumption and lower power output.
the best experience with the 3.8L imo
Raptor Superchargers - Boosting S1/S2 3800's, Ecotec's and Alloytec's
absolutely. they make them all to the same standard, but there is a difference to the tightness from VT to VY.
from what i know, the gen3 for example was built in canada, ie: cold climate, so all gen3's have a rattle...so to remedy this, they brought the gen 4 from mexico, with a similar climate to us...
I have stuck my head next to other vy's and they rattle too. Does the vx rattle seeing that its the same engine? my original vh bottom end is still quieter than the VY....
DW I'm a Spray Painter!
never heard of anything like that before? who told you that?
VZ SSZ- LS1
get you idler pullys checked, i had a faulty one on my V6 VY and it was loading up my motor as if my A/C was on all the time even though my a/c wasnt on.
its the government mate ... they're ripping you off from inside your engine lollll THEYR'RE EVERYWHERE!
"Forget Fast and Furious, I Drive Slow and Luxurious"
hahaha...... you said it nEb!!!!!!!!
BTW about the engines origins, I must have read it in some magazine, either street commodores or motor.......
lol. why would you put a charger on when he is talking about having high fuel economy? did u read the post?
Chuck Norris destroyed the periodic table, because he only recognizes the element of surprise
The Only 6sp VZ Wagon
because all motors today are built with 'sloppy' tolerances to allow for hotter temperatures in export countries so to get more power from a 'sloppy' engine just charge it, didnt you read sheesh lol
EASTERN CREEK JCNSW 2009
ive been warming to light charging over the years since every article i have read about the issue claims you can improve economy in some circumstances. i can see how the 3.8's can benefit from it because you tend to plant the foot (especially uphill) to get the car moving. if there was more torque, the less throttle you would need to apply.
i must make another comment, over time thinking about how the engine performance feels poor, i feel that since the top end has improved in the ecotec line, the engines seem to have a power rush and it feels very strong especially compared to the lazy low-mid range. if you dont check your speed and go by instincts, it feels slow.....
but having driven from syd to melb and back (1800kms), on the highway with a/c on, it was very gutless, needing to shift back on minor rises just to keep up. once only it even went into 2nd on an incline, that i felt 3rd would have been appropriate, so it sort of forced me to plant the foot down after the shift so it wouldnt jump back and forth....
ive always read in magazines that the vy was torquey compared to vz, but when looking at the dyno figures (vy brochure), it is really the other way round.....
(vy 270Nm @ 1500rpm lol where is it???)
Ecotec 152kW at 5600rpm 305Nm at 3600rpm.
Alloytec 175kW at 6000rpm 320Nm at 2800rpm.
Alloytec 190kW at 6500rpm 340Nm at 3200rpm.
The GenIII was initially built in Mexico and then it started getting built in Canada. Don't worry about where it's built, GM only varies one thing....profit margin. The tolerances of the engine specs are set in concrete by the GM engineers (Gods) at the concept/ implementation of the engine. After that GMs' goal is to try to do it as cost effectively as possible
for sure chargedvx6. it kinda gives me the skid marks (non automotive...lol) when you read that one car that gets tested is lame, then the other is ok, and the other one is a pearler!!! thank god for mass production... imagine if they made only afew examples they would all be bad, but if you make heaps, one of em is bound to come good!!!!.........lol
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