Sphinx415

ok...i have tried forums after forums and nothing...here is a video of what is going on...car was running fine to work about 3 months ago....got off work tried to go home and car started to buck under boost...once i get into boost it brakes up a lot and acts like it will die and run like crap...ok...so heres a list of what i have done...i have checked for timing...its good...boost leaks...i did a pressure test on the whole system and fixed about 3 leaks...minor leaks...new couplers new clamps...new ecu just bought it...new spark plugs gapped to .028...coil packs seem to work fine...i disconnect then one at a time and stuck a screw driver in it and watched the spark jump on each one...fuel pressure is at 32psi with fpr vac and 42psi with no fpr vac....did a compression test and it holds at 125-130psi on all 4...no smoke out the exhause...the only way i know how to check the maf is that i unplug it while running...and it seems to go to higher idle rpms and then drop to normal and when i plug it back in it almost dies but continues to run and go back to normal idle...ibattery at idle is 13.6 voltage...maf voltage is....white wire is 1.14volts and black wire with white strip 13.75 volts...tps... white wire is .189volts light blue with red stripe is 5.09 volts at idle,....tps without the car running just in the on possition is blue w/ red stripe 5.09 and white wire is .25 volts.. closed and wide open is 3.90 volts...in the on possition the coil pack harness is 11.5 volt across the board on the middle wire...maf voltage on the on possition black wire w/ white stripe is at 11.5 volts...let me know if you guys need any more voltage from anything and ill gett it..or if my voltage is wrong.....i think thats about it...anything else or that im missing?? im lost i need a lot of help..... im going nutts.

stock everything except fmic and greddy bov 3" exhaust...
s14 with s14 sr20det zenki.

Camo

That is EXACTLY what mine is doing. Ive tested everything you have and cannot figure it out. The only difference between yours and mine is that I am boosting higher and have less vaccum. Can you get me a picture of what your vaccum lines look like under the tb and where they go, or a discription?(vaccum dummy)

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Sittin' Sidways Since 2007

Sphinx415

not a problem...check with me at about noon tomorrow and i will have a picture for you...i did another boost test and found that my brand new gready bov type rs (pile of sh**) was leaking out the top screw and the vac screw...what a piece...so now it got a little better but still breaks up just not as often and at higher psi...so now when i do my test i have to up the psi and check for leaks because i really think its a boost leak that i am just not finding

Camo

yea, tommorow Im going to go over EVERYTHING again.

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Sittin' Sidways Since 2007

Sphinx415

sorry i didnt get a chance to take a picture but ill just tell you...the two top lines are plugged and the two bottom looking at it from front of the car the left one is directly connected to the boost gauge and the other line (right) is connected to the bov...no boost controler....

Sphinx415

altenator checked out to be charging great...no problem there

Camo

Thanks, I think I have the hoses correct

I made one of these last night, cost like $5 and helped big time.
IC Pipe Tester
I found a major boost leak I couldnt hear with the loud ass motor running. Vaccum jumped from 5-10in at 500rpm to 10-15in at around 1k. I still think I may have a problem but the car ran outta gas so Ill have to wait until later to go get some and test drive it.

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Sittin' Sidways Since 2007

lazysk8er2

i also have the same problem sounds like machine guns goin off out of my exhuast...checked evcerything you did someone mention the iac might be fudged but i have the turbo off my car now for a rebuild...someone also mention the wastegate also might be acting up...these are all suggestions i got ontop of what we both checked...let me know if you get anywhere with this...cuz im gonna go through my coolant temp sensor and possibly change the o2 as well.



also for that ic leak testor gizmo does the car need to be on or off im guessing on but please lemme know. thanks!

born2boost

im having the same problem but im running a map sensor so im kinda ruling out the boost leak. replaced the ignitor and im going to try the coils. My iac valve is disconnected because it went out but im on a haltech and ran a few events with no problems disconnected. Im leaning toward injectors next i was close to maxing out my 550's on the tune.

Sileighty_85

Have you cleaned your MAF? It maybe dirty

Have you checked your injectors? Ohm them out per FSM

Also your compression levels are really low, Standard is 156, Minimum is 128 psi

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1989 Built SR GT2871R -363whp
1998 S14 W/RB25- 250ish (For Now)
1986 SR86 - 200ish
1990 R32 GTR - 320hp
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born2boost

i just got back from the dyno plugged the iac valve back in it idles at 2k rpm but i just made a solid pull of 326 whp on a dynodynamics. I was hitting over 15:1 a/f and now its back to normal.

fliprayzin240sx

Try the ECU water temp sensor...thats my stab at it. If the sensors bad, the ECU doesnt know how hot the engine is. Sounds like its causing the engine to dump excess fuel into the engine...

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superman240sx

check maf, maf clip and wires to the maf..sounds like the same problem I had, it was my clip.