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HELP. accelration sputter. replace everything. no clue

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GsxHybrid

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Discussion starter · #1 ·
i have a huge proplem that first start to sputter my car after i would hit 10lbs of boost. now the sputters as soon as i demand power from my car. it even sputter now when i rev it. plz help
here a run down of whats on my car
4g64 block with 4g63 91 head. 16g turbo, fuly built and balnace bottom. cyclone intake, walbro 255 fuel pump, megan full exhaust 3in, greddy e-manage(boost controller and piggy back). thats about all i can think of that might help figure it out. i have pluntty of other if you want to know any more.
ive also replace these part to try to fix it
plugs and wire, MAF, TPS, ECU, fuel regulater, coil 90rewire, power tran, fuel filter, and complete tear down / rebuild of intake and injection system
PLZ HELP ME!
 
#4 ·
first start to sputter my car after i would hit 10lbs of boost
Click to expand...
Would point to a boost leak.


it even sputter now when i rev it
Click to expand...
Now that its doing this, I would have said plugs, wires, mas, etc. But you've already checked all those.

Whats your compression?

Oh and do a boostleak test :D simply because the original problems and the new one could be unrelated.
 
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Discussion starter · #6 ·
ok day 2 down still same thing. your right i havent did a leak test cuz i have no compressor right now, but going to try it. it seems to do it when i switch from vac to boost. i notice my air/fuel reading wird lately. it dont feel like boost leak it feels like ignition cutting out, but its not. i am running really lean now too. it acts like im blowing the spark out. i do have a mech fuel pressure gague in my fuel lin above the fuel fliter it reads 45 running 40 not. it did read 65psi but i noticed my fuel filter was calapse. so i changed it. i dont know what to do. my spark gaps a 28 i chang it thousand of times. i still keep going to the fuel system . my air/fuel not right. ne1 know what is the imeterator for air/fuel ratio. from the mass to the O2 reading what to put the mixture at. i think thats where i need to go.
 
#7 ·
What kind of A/F gauge do you have? If its not a wideband, its garbage and you should not even look at it, much less have it in the car :p. If it does it when you switch from vacuum to boost, would be the symptoms of a boost leak. Do you build boost at all when its sputtering?
 
Discussion starter · #8 ·
i forgot to answer one quest.. my compression at 150psi across the board and i got a 94 thousandths copper head gasket. Im getting even fire too. plug all burning same. i also forgot to mention i change the fuel filter, fuel pump and asemble. injectors, fuel pressure regulator, and fuel rail all back to stock.
 
#11 ·
i do have a mech fuel pressure gague in my fuel lin above the fuel fliter it reads 45 running 40 not. it did read 65psi but i noticed my fuel filter was calapse. so i changed it. i dont know what to do.
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A weak or leaking fuel pump will often not manifest itself at idle. You need to extend the line and tape the gauge to the windshield or something so you can observe your fuel pressure under boost. You should be running 37.xpsi if you're a 1g -- less at idle and in vacuum, and more under boost (stock FPR increases 1psi fuel pressure for every 1psi of boost)

If you're 45psi at idle with the FPR vacuum line attached, then you are already way too high. Perhaps you have a return line issue from the FPR? Or, since you mentioned you replaced the FPR, if you somehow managed to snag a non-turbo one, you will be around 43-44psi at 0 vac/boost, and you will run very rich until you have DSMLink or a custom ECU chip for the different fuel pressure.
 
Discussion starter · #13 ·
its not the plug, i always use autolite 63, none platium. ive alrdy been there with irdium. i think i got a idea. it acts like if you where to twist ur fuel line to the rail, idls fine but sputter under deman. the fuel filt that was origanly on my car was new only 800mi. it also happen to be how much on my new car. i got it i been sitting. so my thougts would be if the filter got clug that back. i think my line r bad. i mean face it r cars r 15yr old well my 93 anyways. 15yr of fuel through aluminn or steel. rust. that where im going next. wish me luck
 
#14 ·
Your going through alllll this trouble before you do a boost leak test. That makes absolutely no sense. Start with the things that could be easy fixes (plugs, wires you already covered). I would definitely boost leak test before I go doing all that shit. You also didnt answer my questions before..

pats95gst said:
What kind of A/F gauge do you have? If its not a wideband, its garbage and you should not even look at it, much less have it in the car . If it does it when you switch from vacuum to boost, would be the symptoms of a boost leak. Do you build boost at all when its sputtering?
Click to expand...
Also, you should run NGK bpr7es plugs in your car. Its a very good plug, a proven good plug for DSM's.
 
#15 ·
well, I had to read that last one twice (actually not a big deal for me, you write just like the other drive ability mechanic at the shop I work at). Let me decipher, the fuel filter you just changed only had 800 miles on it, the problem is still there and you feel like it's still a fuel delivery problem. You're now guessing that the fuel lines are bad!!! Well, the lines themselves are not so much a problem, just disconnect the input side of the filter, do a key on engine off cycle while draining the line into a suitable container and see what it pumps out. If indeed the fuel pressure regulator is good, the filter is good and it is a fuel related issue, you either have a bad pump or a bad fuel pump sock filter. Your name is GSXHybrid and you have a TSI so I'm assuming you're AWD in which case you can pull the pump without dropping the tank. Try it once you're very low on fuel and see what you have. It's a great time to upgrade you're fuel pump while you're in there. At very least, change the sock filter. Also, get a cheap wet/dry vac and clean the inside of the fuel tank. Put it back together and you're good to go. I still second everyone on here that you should do a boost leak test though. The other drive ability mechanic at my shop still doesn't understand the importance of this test, especially on a recirculated turbo system so I take alot of his labor hours when he gives up!!!!
 
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Discussion starter · #17 ·
ok, i did a boost test yesterday. guess what no leaks. so now back to the fuel system like i said. i do have a wideband a/f guage. it use to g all the way rich when i would accelurat now it all most gets there but dnt . thats the poit it starts to sputter. its more of a mis really. and sandcobra ur right i do own a 91 tsi, but i do also own a 93 GSX (my road cource car) my name come form it GSX cuz of GSX and hybrid meaning hybrid engin (4g63 head on a 4g64 block). hence gsxhybrid. i have a race team that race nothing but DSM we own 7 eclipse 4 r AWD. but back to the 93. i replace my throttle body and flush out the fuel lines. i got a rusty paste out of the line coming from fuel pump to filter. though i found it, but i jsut tooka ride and still same thing. im so lst on what to do this make no damn sence. it started to do this after i tryed to put my cyclone 3pc intake on the relized the coil pack hit nmy ac so i put my old set up back on. that when i started to do this sputter miss thing. here a run down of everything ive tryed.

fuel pump repalce and assembly,fuel fliter, flush fuel line, injecters, cam angle, TPS, throttle body, fuel presure regulator, idle stop soildnod, Mass, compession test (150psi). boost leak (40psi), remove e-manage, replace blow off(kindda leaked), repalce timeing belt, check and recheck timeing.

I also know i cant spell for shit. so if u understand what im saying i would appriate the help. i got test in tune for road cource in 1 month. i need this thing to work.
 
Discussion starter · #18 ·
alright.. ths make no sence. i fixed it. how i fix it is wired. i got so piss off i de4side to beat the shot out of my car to amke whatever was trying to break.. break. but i did the oppist. it fixed it some how. i took my car out ad jsut rapted it throw the gears even though it was ding it. by the time i hit 3rd it seam to subside. so i flip a bitch and run it throw all the gear again. it wasnt doing it. only thing i can guess is i had some shit in my injectors or something, and running it to 8000rpms at 23psi blow it out. any though on WTF it was. i would like to hear ur guys opinon befor i close this thread.
 
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