acceleration probs

[Azman]

Hi guys,

Hope I am sticking this in the right section but I am having a bit of a prob under hard acceleration (chased my mate in his new (03 plate) WRX STI Prodrive scooby). It feels like the car stutters at certain points up the rev range and retards itself then gives it stick all in the space of less than a second.

What do you reakon??

The fuel pump is making a bit of a whirring noise but has ever since I have had the car. There is no boost leak that I can figure as all the intake piping is metal with samco joiners and v.good clamps. Also the boost guage never twitches when it happens.....

Any ideas or is it just the pump not keeping up as it is the standard CQ20 pump fueling a 3B?

Cheers

Aaron

[Azman]

OOOO, might as well tell you even though it was like that I still hung onto his **** and I was two up.... . probably be even better when I get the new 3" exhaust.

[A80Avant]

mine does a similar behaviour.revs up nicely from 3200-4500,then reduces boost to 1.3 up to 6000rpm then kicks again up to 7000rpm(tested on 4th gear).My chip supposedly keeps the 1.5bar all the way.Besides bar figures,on the same more or less rpms,the car feels a bit drowned when it should accelerate normally.I think i have a portion of bad fuel in the car,and probably im getting this behaviour.I have used injector cleaning in the tank,and also put another one in soon...see how it goes...

[s2dude]

OOOO, might as well tell you even though it was like that I still hung onto his **** and I was two up.... . probably be even better when I get the new 3" exhaust.

Proper 3B fuel pump would defo be worth a try.....
Just fitted a new one to mine....£65 from GSF for Siemens quality one...
and test plugs, leads and dizzy

[quattronutter]

check your leads and plugs,could also be maf fault..

[ericd]

Hi guys,

Hope I am sticking this in the right section but I am having a bit of a prob under hard acceleration (chased my mate in his new (03 plate) WRX STI Prodrive scooby). It feels like the car stutters at certain points up the rev range and retards itself then gives it stick all in the space of less than a second.

What do you reakon??

The fuel pump is making a bit of a whirring noise but has ever since I have had the car. There is no boost leak that I can figure as all the intake piping is metal with samco joiners and v.good clamps. Also the boost guage never twitches when it happens.....

Any ideas or is it just the pump not keeping up as it is the standard CQ20 pump fueling a 3B?

Cheers

Aaron

you had a look at the condition of the fuel filter ????

[YELL MAN]

I seem to get similar problems i am still trying to get to the bottom of it but whenever i clean the MAF with electrical cleaner it fixes it for a while then it comes back i am going to try isopropyl next and see if that works better.

[newsh]

poor fuel?

[A80Avant]

i also cleaned my MAF with carb cleaner,wasnt all that dirty anyway,still getting those troubles.Also changed my spark plug pipes with some better ones a little while back.

[stroker]

For a better flowing fuel pump try one of these 044 motorsports high flow units.

http://www.034motorsport.com/index.php?cPath=24_78&osCsid=18d6e0db6fa108fe677e8d295d044487

Or this one is prolly what you guys need???

http://www.034motorsport.com/product_info.php?cPath=24_78&products_id=383&osCsid=734c07c898008cc7139f4e306876e073

But ask Javad...he can help you out.

No offiliation, bla, bla, bla, just a great chap with great parts

[Azman]

Not the fuel filter as it was changed about a month ago when teh oil and oil filter was done, HAve just changed to Samco's and seem to have lost a bit of water so I am going to top it up and see if I lose it again as I am sure I have no leaks so it may be a head gasket job......
Fuel pump sounds like its grinding to death aswell so it may be that too. fuel is BP super stuff so it should be okay.
Haven't cleaned the maf since I had the car so I will also give that a go.
anyone got a how too on that one....

Cheers

[Azman]

@ Quattro nutter - which leads and plugs are we on about (spark I'm guessing but tell me if I am wrong)

[WabTheKing]

3B fuel pump same as 7A if IIRC

spark plugs were changed last year because of a miss fire addmittedly tho werent new ones, they were out of top sparkys car before the insurance people stole it

sounds like fuel pump could be getting fooked or may be fuel pressure regulator could cause this

[Azman]

Hmmmm, seems to be a bit intermitant aswell, went out for a blast earlier and all was fine..... Strangerer and strangerer!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[s2dude]

Hmmmm, seems to be a bit intermitant aswell, went out for a blast earlier and all was fine..... Strangerer and strangerer!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Does it get worse when its really hot (weather)?? Mine did this just before the fuel pump died.......
next morning it started ok again!!!! But the Fuel Pump was bad so I swapped it for a new one.