first post! low power high fuel.

Spider · Post by **Spider** » Sat Oct 13, 2007 5:13 pm

Fasterstill wrote:

" Also just changed the fuel filter and the fuel that ran out of BOTH ends of the filter was filthy."

Filthy=dirty? As in "DIRT" ?

May have some in your tank ?
Also ? I bet your injectors are filthy/dirty as well.
Did you run injector cleaner yet ?

fasterstill · Post by **fasterstill** » Sat Oct 13, 2007 6:31 pm

Spider wrote:Fasterstill wrote:

" Also just changed the fuel filter and the fuel that ran out of BOTH ends of the filter was filthy."

Filthy=dirty? As in "DIRT" ?

May have some in your tank ?
Also ? I bet your injectors are filthy/dirty as well.
Did you run injector cleaner yet ?

Yep Dirty as in it looked like strong coffee with a tiny bit of milk in. E.G you could not see through it at all.
Yep im running the third tank with injector cleaner now.

Tryed cleaning the air flow sensor with electrical contact cleaner this afternoon but its usless, hardly touches the muck, will find some carb cleaner and try that next.

AFTER THOUGHT: What does the injector cleaner do to the colour and opticity of the petrol?
Could it be the injector cleaner that made the petrol look so dirty when i changed the fuel filter?

Spider · Post by **Spider** » Sun Oct 14, 2007 2:42 am

Your on your third cleaning, have you done anymore fuel filter replacements or looked at the fuel in the current one?

Any injector cleaner I have ever used is clear. And did not change the color of the fuel. A brand called "Berrymans" (sp?)
Another popular product is called "Sea Foam" I believe it is also clear.

I't seems to me that somehow you have stuff in your fuel tank that shouldn't be there.. Like water, rust, dirt/mud ?
Maybe even some coffee and milk ? Tea time?

Whatever it is needs to be eliminated. Whatever it is has probably clogged your injectors. And whatever it is, is probably the source of your
'not starting when hot' problem.

Not sure about your model Daewoo but most of them have a filter built into the fuel pump.

fasterstill · Post by **fasterstill** » Sun Oct 14, 2007 2:56 pm

Spider wrote:Your on your third cleaning, have you done anymore fuel filter replacements or looked at the fuel in the current one?

Any injector cleaner I have ever used is clear. And did not change the color of the fuel. A brand called "Berrymans" (sp?)
Another popular product is called "Sea Foam" I believe it is also clear.

I't seems to me that somehow you have stuff in your fuel tank that shouldn't be there.. Like water, rust, dirt/mud ?
Maybe even some coffee and milk ? Tea time?

Whatever it is needs to be eliminated. Whatever it is has probably clogged your injectors. And whatever it is, is probably the source of your
'not starting when hot' problem.

Not sure about your model Daewoo but most of them have a filter built into the fuel pump.

Ran two tanks of cleaner then changed fuel filter and now running third tank. Have collected some of the dirty fuel and let it settle, its very small particals of dirt although when watching the fuel evaporate it did look like the particals were being drawn to each other. Looked weird watching all the particals dancing about, thought it was full of something alive on first glance.
Model is 1999 Nubira 1.6, 16V wagon or estate, depends which side of the pond your on

Not sure where you got the not starting when Hot from must be another thread m8 mines fine on hot starts, just gutless at low revs.

Audacity Racing · Post by **Audacity Racing** » Tue Oct 16, 2007 11:55 pm

Shot in the dark...

You have a 1.6L... which means your engine is equipped with VGIS (variable intake geometry)...

Typically the VGIS opens at higher RPMS. Perhaps by some really strange fluke your control canister got blocked or the actuator is stuck and the manifold is stuck in high RPM mode. I can't imagine the effects would make the car useless, but it stands to reason that you'd loose low end power.

On the side of your intake manifold is an actuator...
Looks similar to this...

Push/pull the shaft that comes out of it (it's a fairly light spring) and see if it's sticking...

Again, total shot in the dark

fasterstill · Post by **fasterstill** » Wed Oct 17, 2007 12:41 am

Audacity Racing wrote:Shot in the dark...

You have a 1.6L... which means your engine is equipped with VGIS (variable intake geometry)...

Typically the VGIS opens at higher RPMS. Perhaps by some really strange fluke your control canister got blocked or the actuator is stuck and the manifold is stuck in high RPM mode. I can't imagine the effects would make the car useless, but it stands to reason that you'd loose low end power.

On the side of your intake manifold is an actuator...
Looks similar to this...

Push/pull the shaft that comes out of it (it's a fairly light spring) and see if it's sticking...

Again, total shot in the dark

Yep already checked that but thanks anyway.

Audacity Racing · Post by **Audacity Racing** » Wed Oct 17, 2007 12:46 am

My appologies, I scanned and didn't read the entire thread

Spider · Post by **Spider** » Thu Oct 18, 2007 5:38 pm

fasterstill wrote:
Spider wrote:Your on your third cleaning, have you done anymore fuel filter replacements or looked at the fuel in the current one?

Any injector cleaner I have ever used is clear. And did not change the color of the fuel. A brand called "Berrymans" (sp?)
Another popular product is called "Sea Foam" I believe it is also clear.

I't seems to me that somehow you have stuff in your fuel tank that shouldn't be there.. Like water, rust, dirt/mud ?
Maybe even some coffee and milk ? Tea time?

Whatever it is needs to be eliminated. Whatever it is has probably clogged your injectors. And whatever it is, is probably the source of your
'not starting when hot' problem.

Not sure about your model Daewoo but most of them have a filter built into the fuel pump.

Ran two tanks of cleaner then changed fuel filter and now running third tank. Have collected some of the dirty fuel and let it settle, its very small particals of dirt although when watching the fuel evaporate it did look like the particals were being drawn to each other. Looked weird watching all the particals dancing about, thought it was full of something alive on first glance.
Model is 1999 Nubira 1.6, 16V wagon or estate, depends which side of the pond your on
Not sure where you got the not starting when Hot from must be another thread m8 mines fine on hot starts, just gutless at low revs.

EDIT by spider;
( My bad, was thinking of another thread.. change that; 'not starting when hot' to: "gutless at low revs")

I stand by the post though.. you have crud ("particals") in your fuel that is not helping anything..
fuel pump (strainer could be plugged) and injector injection spray is in question.

fasterstill · Post by **fasterstill** » Fri Oct 19, 2007 6:25 pm

OK this is getting silly, time for a re-cap:

Problem:
Lack of power at the low end, everything fine after 4000 rpm.

Possible causes:

lack of servicing, e.g, plugs, fuel filter, air filter.
Leaking exhaust, small blow in the front down pipe where the spring is.
VIGS, sticking or inoperative.

Things done:

Full service, plugs, leads, fuel filter (outlet fuel flow now clean) and performance air filter fitted into front offside wing.
Checked VIGS, working fine.
MASS air sensor, cleaned, first with electrical contact cleaner then with carb cleaner.
Replaced front down exhaust pipe.

Present situation:

Low end pickup seems to have improved but at 4000 where i used to get a big boost of power i now just get lots of noise from the intake filter but not as much boost as previously. (need to reduce the intake noise, im in my 40's so the boy racer looks not a good look on me) not only that but if im pushing on so to speak i don't want to attract any more attention than nessersary.

If anyone has any ideas why i've lost the top end boost please post.
Must say though its much nicer to drive now, i don't need to slip the clutch up to about 2000 when pulling away any more. I supose its saving me petrol as im trying to keep the revs below the point that the intake starts roaring

Am having lowered 40mm springs fitted Sunday so that will be fun, can't wait to throw it into a few corners on the way back.

Should i start this as a new post as its not realy relevent to the title any more ?

mezomaster · Post by **mezomaster** » Fri Oct 19, 2007 10:53 pm

check your O2 sensor, it may isnt getting your CEL on, but it may be not functioning well, but not damaged totally to CEL, also check the fuel regulator...

i cant think about anymore things right now

daewoomofo · Post by **daewoomofo** » Sat Oct 20, 2007 1:23 am

ok so you have a 1999 nubi wagon, 1.6 16 valve. you have new plugs, wires, fuel filter, air filter, but you do have a exhaust leak. you have bad performance at low rpm's, at about 4000 rpm's it gets better, due to the vgis kicking in. you are also experianceing poor fuel economy. you stated in your first post that you "certainly don't drive it gently", this could be one of the causes for the low fuel mileage, and also the fact that you have a heavy car powered by a small engine. i say try driveing it easy, keep it under 3000 rpm's if possable, and on the freeway stay below 70 mph, see if you experiance any increase in mileage. on the performance side of things, with this being such a big heavy car, its gonna be tough to get "great" performace out of a 106 hp, 1.6 liter engine. good luck, let us know what happens.

fasterstill · Post by **fasterstill** » Sat Oct 20, 2007 3:50 pm

mezomaster wrote:check your O2 sensor, it may isnt getting your CEL on, but it may be not functioning well, but not damaged totally to CEL, also check the fuel regulator...

i cant think about anymore things right now

Thanks for that, any tips on how to check the fuel regulator please.

daewoomofo wrote:
ok so you have a 1999 nubi wagon, 1.6 16 valve. you have new plugs, wires, fuel filter, air filter, but you do have a exhaust leak. you have bad performance at low rpm's, at about 4000 rpm's it gets better, due to the vgis kicking in. you are also experianceing poor fuel economy. you stated in your first post that you "certainly don't drive it gently", this could be one of the causes for the low fuel mileage, and also the fact that you have a heavy car powered by a small engine. i say try driveing it easy, keep it under 3000 rpm's if possable, and on the freeway stay below 70 mph, see if you experiance any increase in mileage. on the performance side of things, with this being such a big heavy car, its gonna be tough to get "great" performace out of a 106 hp, 1.6 liter engine. good luck, let us know what happens.

Nope

the exhaust leak is now fixed. When i state that im getting lower performance im refering to what i have had previously from this engine so its not due to the weight of the car.
Re the high fuel usage, i recently did a long motorway trip, 400 miles and stayed at about 70 or so but still could not get to 30 mpg.

daewoomofo · Post by **daewoomofo** » Sat Oct 20, 2007 3:56 pm

ok, well im out of ideas then. i wasnt aware of you experianceing a loss of power, thats kinda odd. have you checked the injectors? i guess thats the last thing i can think of, good luck, keep us posed.

mezomaster · Post by **mezomaster** » Sat Oct 20, 2007 4:02 pm

there is a tool to test the pressure in the fuel rail and regulator, u get it fixed after the regulator on the back line fuel to the tank and see what is the pressure reading, its a tool which looks like a clock, u will find it at a mechanic..

i dont know how much would the test cost you, but i know the regulator isnt expensive so u can compare before u pay anything, maybe u can just buy another regulator and replace it if the mechanic would cost u much...

i had the same problem before and it was the O2 sensor by the way, it was damaged but the CEL didnt come on yet, and it got on just right before i replace the sensor

fasterstill · Post by **fasterstill** » Sat Oct 20, 2007 5:48 pm

mezomaster wrote:
i had the same problem before and it was the O2 sensor by the way, it was damaged but the CEL didnt come on yet, and it got on just right before i replace the sensor

Thanks for that, thinking back it may have been when i first cleaned the airflow sensor when i lost the 4000 boost. There must be a way to test with a multimeter, anyone know?
re the fuel regulator, i'll look into the cost of a new one and i'll ask the mechanic thats fitting my springs tomorrow, he may have the test gear, you never know.

cheers guys.