|
08-10-2004, 04:36 PM | #1 |
Junior Member
|
Surging problem when driving
Hey again people.. stuill trying to correct this on going problem, ive had it at the tunning guys a few times now and I dont think they can fix the problem although there trying hard. Now what happen when driving along sometimes along the highway or going up hills it will surge. Now when I got my turbo done at the beginning with just the turbo nothing else it was fine.. Now the only thing i can think it has to do with is either the Fuel Pump, Injectors ( which I doubt) or The Ecu. They are the only things that were changed after this problem started occuring. Im leaning towards it being a faulty fuel pump which sometimes doesnt feed enough fuel therefore causing the surging.. im not sure..The maps have all been checked and they are all fine.. has anyone ever had this happen to them??
Cheers Anton |
Sponsored Links |
08-10-2004, 04:50 PM | #2 |
Administrator
Join Date: Mar 2002
Location: melb.vic.au
Car: AZ-1, Astina Hardtop Turbo, BJ Protege, Beetle
Posts: 16,525
|
is it an in-tank fuel pump
and if so, maybe the pickup is sitting awkwardly/in the wrong place/is fouling on something inside the tank just a thought
__________________
jdmparts.rupewrecht.com Sourcing your not-quite-overnight parts from Japan WRECHT--|--SLOWTEGE--|--BEETLE--|--SUBSTITUTE--|--AZ-1 |
08-10-2004, 05:28 PM | #3 |
Junior Member
|
Yeh I think it is an intank fuel filter, but im not really sure how to get at it..Its only 2 years old so im thinking it shold be fine... thanks for comments
|
08-10-2004, 05:34 PM | #4 |
Senior Member
Join Date: Sep 2004
Location: n/a
Car: n/a
Posts: 10,929
|
fuel pump sitting in the wrong position, dirty fuel filter/system, dissy/plug leads or plugs.
I had the same problem, the leads had a very, very small hole in them and as they heated up, the spark would jump from the lead straight to the block instead of going thru to the plug, hence is was running on 3 cyliders, not 4 like it shound had been. To test, while engine is idling, test 1 lead at a time by taking it off the plug, and just passing the lead past the block, if there's a spark leak with the leads, you'll see a small blue spark jump from halfway down the lead. good luck with it. |
09-10-2004, 01:10 PM | #5 |
AstinaGT Regular
Join Date: Mar 2003
Location: Sydney, Australia
Car: Evo 8
Posts: 301
|
Well lets not go rocket scientist on this one...
ok surging like you describe is almost definitely a fuel delivery issue on extreme load when it needs fuel... i doubt those injectors are faulty (i've only ever recieved one dodgy batch from our suppliers before, so i think the set i sent you should be fine, if in doubt get them tested and we'll take ema back under warranty though =p) Do you have a fuel pressure regulator? What pump are you running? is it a direct bolt in denso one or what? We will get to the bottom of this... if it ran fine and all you've done now is injectors a pump and an ECU then i suspect the pump... you get a stuffed injector it will run rich and misfire and blow fuel out the back, or run real lean and ping
__________________
SP2NV 03 Black Sp20 Turbo _____________________________________ To boost or not to boost - http://www.trafficmesh.com |
09-10-2004, 05:20 PM | #6 |
Junior Member
|
yeh im not sure what fuel pump they installed so i cant answer your question. As to the fuel pressure regulator I dont have one
|
09-10-2004, 05:34 PM | #7 | |
コスモ
Join Date: Dec 2002
Location: Location: Vic
Car: Mazda '95 Astina I4, '86 B2K and '10 3 MZR-CD
Posts: 7,888
|
Quote:
Check your reciept, the fuel pump details should be detailed there.
__________________
My 'stina Hatch |
|
09-10-2004, 06:16 PM | #8 |
AstinaGT Regular
Join Date: Mar 2003
Location: Sydney, Australia
Car: Evo 8
Posts: 301
|
when running an aftermarket fuel system an adjustable fule pressure reg is almost one of the most important parts, simple because if you don't control the pressure the fuel sits at the whole time the pump will be pumping as much as it can on the power its getting the whole time(making the amount of fuel going through the injectors unpredicatable)... you turn your head lights on and drain part of the supply and the fuel pressure will go down because the pump isn't chargin away so hard... If you still have the standard one setup your injectors aren't getting the fule they desire, as stock fuel pressure is around 25-25psi those injectors i gave you would be much happier at around 40-45psi to keep the duty cycle nice and low
I'd definitely invest in an aftermarket reg.. a Malpassi Rising rate fuel presure reg - low end model will set you back $160 - $180 trade $200 retail and will do the job, not the greatest on the market but it should hold pressure for quite a while, and they're rebuildable if they leak if you want something nice, shiny and more than happy to take what ever you throw at it i'd go for either an SX Racing or Sard rising rate fuel pressure reg will set you back around $250-$280 trade and around $300 retail... by far my first choice, but i hate things failing on me, its always the simply thigns that cause the worst head aches... Both the above models have the additional option of an on board fuel pressure gauge which should set you back around $6, helps in setup hugely as it saves time on hooking a fuel pressure gauge onto the line While hooking an aftermarket fuel pressure regulator to the late model astina's becomes abit of a hassel in installation though. Our fuel system uses quick release fuel lines using solid plastic instead of actual hosing... this creates the hassl that the fuel rail and lines from the tank don't have barbs on them, making it impossible for a hose clamp to hold on properly. But with a trip to your local Enzed or Pirtec you can get fitting that are one way non removable items. They have an olive inside the fitting that as you tighten the nut it crimps itself into the metal.. only way of removal = angle grinder.. shopping list for 99- 03 Astina aftermarket fuel pressure reg: - Fuel reg of choice - a few metres of fuel hose (depending on mounting position) - 4 hose clamps - 2 crimp fittings( one for the line to the tank.. one for the rail itself - 2 barbed hose fittings(to go on the end of the crimp fittings) after all this, even if as we prevously discussed you do you a bad ground, or a loose ECU wire at least you know its getting enough fuel... and it will both rule the possibility out (unless you have a dodgy pump) and give you the piece of mind that you have the system setup right kinda typed it all in one go, so if the spelling is off or you need more help understanding something as always i'm more than happy to help
__________________
SP2NV 03 Black Sp20 Turbo _____________________________________ To boost or not to boost - http://www.trafficmesh.com |
09-10-2004, 08:01 PM | #9 |
コスモ
Join Date: Dec 2002
Location: Location: Vic
Car: Mazda '95 Astina I4, '86 B2K and '10 3 MZR-CD
Posts: 7,888
|
Say what????
The job of any fuel pressure reg is to maintain pre-determined pressure at the injectors. It is designed to alter this pressure depending on the vacuum/boost in accordance with the duty cycle of the injectors. An FPR is a tuning device and needs to be taken in context. If you install a larger fuel pump then the FPR will return the extra volume and pressure back to the tank (you won't notice any change). If you turn on the headlights and reduce the amount of current to drive the fuel pump then guess what... The FPR compensates and returns less pressure back to the tank. The only difference between the standard FPR and an after market one is that an after market FPR you get to set the baseline pressure, if you run a little rich then you can iron out some flat spots without actually fixing the real problem. NB. An FPR is not an electrical device. The headlight thing only refers to the performance of associated electrical components Anyway I guess I don't agree with Doug but that's OK this is a place for people to express their views. My first action would be to look back to the changes made previously and get them right before forging ahead.
__________________
My 'stina Hatch |
10-10-2004, 02:53 AM | #10 |
AstinaGT Regular
Join Date: Mar 2003
Location: Sydney, Australia
Car: Evo 8
Posts: 301
|
i totally agree with cosmo... i was under the impression that the car was running without the stock fpr...
hence the quote "If you still have the standard one setup your injectors aren't getting the fule they desire, as stock fuel pressure is around 25-25psi" I would only put a RRFPR on and up the pressure heaps if your maxing the injectors on a stock fuel setup and need the try and push the extra fuel through... As cosmo said "if you run a little rich then you can iron out some flat spots without actually fixing the real problem." luckily for anton he has injectors and a pump... so enough fuel shouldn't be the issue... well put on the whole definition though.... I think both cosmo and i were trying to say the same kinda thing just he described it better and i rushed my addition to the thread while getting into my installation info =)
__________________
SP2NV 03 Black Sp20 Turbo _____________________________________ To boost or not to boost - http://www.trafficmesh.com |
10-10-2004, 07:07 AM | #11 | |
Senior Member
|
Re: Surging problem when driving
Quote:
__________________
JynX 1994 Turbo BA Astina 200whp @ 12psi "If you cant drive fast with 90hp..... 900hp wont help you" |
|
10-10-2004, 08:30 AM | #12 | |
コスモ
Join Date: Dec 2002
Location: Location: Vic
Car: Mazda '95 Astina I4, '86 B2K and '10 3 MZR-CD
Posts: 7,888
|
If anyone wants to know a little more about what is being said here then here it is.
Quote:
__________________
My 'stina Hatch |
|
10-10-2004, 01:26 PM | #13 |
AstinaGT Regular
Join Date: Mar 2003
Location: Sydney, Australia
Car: Evo 8
Posts: 301
|
****... i'm on dialup at the moment dude... that sucked...
__________________
SP2NV 03 Black Sp20 Turbo _____________________________________ To boost or not to boost - http://www.trafficmesh.com |
10-10-2004, 04:35 PM | #14 |
I MUST STOP MAKING STUPID POSTS! Yet I keep on making them. And I wonder why I get banned?
Join Date: Mar 2002
Location: DansVille
Car: auto
Posts: 4,326
|
i bought a malpassi RRFPR a while ago. its the one thats all black sorta. still uninstalled, i bought it thinking it would be ok for my car but now im not sure if its overkill or not.
|
10-10-2004, 04:47 PM | #15 | |
コスモ
Join Date: Dec 2002
Location: Location: Vic
Car: Mazda '95 Astina I4, '86 B2K and '10 3 MZR-CD
Posts: 7,888
|
Quote:
__________________
My 'stina Hatch |
|
10-10-2004, 08:34 PM | #16 |
I MUST STOP MAKING STUPID POSTS! Yet I keep on making them. And I wonder why I get banned?
Join Date: Mar 2002
Location: DansVille
Car: auto
Posts: 4,326
|
haha u got it all worked out for me eh!
|
11-10-2004, 12:05 PM | #17 | |
Junior Member
|
Re: Surging problem when driving
Quote:
|
|
11-10-2004, 06:14 PM | #18 | |
コスモ
Join Date: Dec 2002
Location: Location: Vic
Car: Mazda '95 Astina I4, '86 B2K and '10 3 MZR-CD
Posts: 7,888
|
Quote:
__________________
My 'stina Hatch |
|
12-10-2004, 09:21 AM | #19 |
I MUST STOP MAKING STUPID POSTS! Yet I keep on making them. And I wonder why I get banned?
Join Date: Mar 2002
Location: DansVille
Car: auto
Posts: 4,326
|
haha well ive spent $$ on that fuel reg now its just sitting there!
|
22-10-2004, 01:50 PM | #20 |
1ST BA TURBO MEMBER
|
If you wanna sell it let me know.
Mal
__________________
If you want wind in your hair add a Hairdryer !!! |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Ignition problem. | BlueAstina | Performance & General Maintenance | 16 | 29-03-2007 07:41 PM |
brake problem - abs? | sirex | Performance & General Maintenance | 5 | 14-05-2005 07:16 AM |
BA recirculating air/vent problem - help? | ausastina97 | Interior & Electrics | 13 | 01-07-2004 07:22 PM |
Headlight problem | bmk | Bodykits & Exterior | 3 | 16-08-2003 02:39 PM |
Mounting Driving Lights | joely | Bodykits & Exterior | 10 | 03-07-2003 04:49 PM |