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View Full Version : urgent reply ASAP car is being a bitch (Possible fuel cut??????????????)


orng_mazdaspeed
08-01-2003, 10:45 PM
i was going on a freeway at about 100 MPH and my car started to jerck and slow down. (just installed my boost controller today and intake last night) The car slowed down so i pulled off the road and opened the hood and nothing was wrong visibly. i got back in my car and the car was off. it turned on again easily but now it does not accelerate like its does normally. the hessitation i very bad and it really hesitates at 3000 and pulls very slowly. right now i have it cooling down and i am resetting my ecu. can any one help me out
dominoy2k1
08-01-2003, 10:48 PM
how much boost where you running?
Dr.Sound
08-01-2003, 10:50 PM
dude, check the upper IC pipe where it connects to the BPV, u might have a boost leak.
orng_mazdaspeed
08-01-2003, 10:53 PM
i was running 8 psi and then it jerked really bad . when i stoped and restarted it i set it back to stock sttings. i dont know if its a boost leak beacuse i am still geting the stock psi , just that i have very bad hessitation
Aaron
08-01-2003, 11:00 PM
are you getting hesitation all the time or is the motor really hot
Dr.Sound
08-01-2003, 11:02 PM
dude, my pipe cracked at that spot yesterday...........and my car still shows 6 psi..........but for sure it aint running that.
check, just bend it back a little, see if it comes appart.

oh and let us know if receting the ecu helped.

-Victor
orng_mazdaspeed
08-01-2003, 11:28 PM
i reset it and it still hesitates, checked the piping and it all is in good running order. i am thinking a plug could of gone bad so as soon as it cools down i am going to check them(not sure but i have no idea what is wrong) it has hesitation all the time
Apexi
08-02-2003, 05:38 AM
fuel cut feels like hitting a brick wall....not really jerking
t3ase
08-02-2003, 06:27 AM
I just installed Joe's MBC tonight and I thought I'd try putting the K&N cone filter on at the same time for the extra noise... I installed it, reset the ECU and away I went.

Even with the fuel pressure reducer kit installed, I had MAJOR hesitation. I came back home and put the stock airbox back on and reset the ECU again. Started it up, let it idle a bit and off I went. No hesitation at all now...

What kind of intake are you talking about? Injen CAI? K&N Cone Filter? K&N Drop-In Filter? Custom Made? I have a feeling it has to do with that since all of your pipes checked okay..

Oh, and I picked this up from talking to OrangeMSP tonight. Mix up a spray bottle with water/soap and then spray the hoses you played with while installing the MBC while the car is running. See if any hoses bubble up, as there may be a small crack that's too small for you to see but opens up as air is rushing past it.

Good luck.
t3ase
08-02-2003, 06:29 AM
After reading your post again, it seriously sounds like when my I/C pipe cracked where the BPV hose meets it. Be sure to check that joint, as MANY of us have had that break apart. It's not too obvious unless you actually pull it. OrangeMSP and I think mine broke off from the stress I put on it while I was taking the stock airbox off to replace it with the K&N for the night.
Kenetix
08-02-2003, 03:32 PM
Remember, if you stick just a cone filter on the end of the stock intake, the fan blow counter-clockwise right towards the filter. Wa La - hot air.
t3ase
08-02-2003, 03:42 PM
Speakin' of which, would it be possible to rewire the fans so they're push fans instead of the current pull fans? Anyone thought about that? I know on my old Accord it had Flex-A-Lite fans which could be switched depending on voltage..
RX-KEVIN
08-02-2003, 04:52 PM
definitely feels like a brick wall
RX-KEVIN
08-02-2003, 04:55 PM
has a check engine light came on.

you have a medium sized boost leak somewhere on the pressure sideand the reason it feels like shit after 3000 is cause that's where the boost is at
orng_mazdaspeed
08-02-2003, 08:01 PM
i have the injen intake so its not geting air from the fan, also i have not located a boost leack so can any one help me to find it ??
Kenetix
08-02-2003, 08:03 PM
Speakin' of which, would it be possible to rewire the fans so they're push fans instead of the current pull fans? Anyone thought about that? I know on my old Accord it had Flex-A-Lite fans which could be switched depending on voltage..

I'm not sure, but its sure as hell worth finding out.
alexlitov
08-02-2003, 08:25 PM
Did you try resetting your ECU?
orng_mazdaspeed
08-02-2003, 10:04 PM
yea i reset the ecu like 3 times
PHRiSCo
08-02-2003, 10:12 PM
Im getting the same jerk as you at 9psi, its the fuel cut. Your gonna need an AFC to fix that stuff. Im getting a Split Second Electronic Fuel Controller this week, Ill tell you guys if that solves the problem.
orng_mazdaspeed
08-02-2003, 11:49 PM
phrisco - can you describe the jerking you were felling to me ?? mine is wierd because it drives normal (a little slower than usual) but then in 5th gear it feels like it has no power throught the whole power band. then after a while of test runs and goig about 110 mph it starts to jerk. i slow down to a stop and take off, then in 2nd gear about 3000 it starts to jerk like if some one was pumping my brakes.
DiscreetSpeed
08-03-2003, 02:31 AM
heh and no CEL?
orng_mazdaspeed
08-03-2003, 01:14 PM
no CEL and that is why i dont know what it could be.