Breaking up at 3000rpm and up

[tucker3113]

my car was fine and now it is breaking up from 3000 rom up under half to full throtle. Any ideas or has someone had this problem before.

[IanS]

Welcome to Nico

A list of your setup will help us diagnose you problem more easily

what do you mean by breaking up, do you mean it has a misfire?

are there any other symptoms, like, black smoke, rough idle?

[tucker3113]

s13 red top t28 turbo greddy front mount turbonetics bov by breaking up I mean it hesitates and back fires a bit but still can make it to redline.

[tucker3113]

Partial throttel it will boost and pull hard just anything past that and it spits. I was thinking boost leak but cant find anything leaking. Got any ideas?

[jdm_master_X]

hesitation issues are caused by a ton of things. definitely test the obvious:-TPS-MAF-IACV-fuel filter-boost leak-vacuum lines

[tucker3113]

Checked maf and tps need to check for boost leaks but had no time to through back in boost gauge after swap in new car. Keep the ideas coming thanks for the help

[IanS]

make sure your coil packs are bolted down and grounded

[S13FASTBACKSR]

what do you have your timing set at? should be 15degrees btdc however i have heard many sr guys say that 15degrees and the engine wont run right while many say it does..so play around with timing a bit. spark plug gap on the t28 should be about 30-32. You can also try cleaning your maf with a can of electronic cleaner..it comes in a spray can so just spray it right on the sensor. also try checking your ecu for codes thats usually the easiest way of finding the problem since there could be so many culprits for these symptoms

[tucker3113]

timing is still stock checked everything could think of no boost leak still no clue what it is. I had a feeling this was one of those things that was going to drive me nuts

[srpowered240sx]

my car did this yesterday, the vacume hose may have come off of the turbo. do you have a boost gauge?? is it reading normal vacume at idle??

[tucker3113]

what should the vacuum be at idle and I dont think that it is a boost issue due to the fact that the gauge holds at 8 all through acceleration under full boost

[tucker3113]

any one have the pinout and voltage for the iacv so I can check it I am not getting any surge at idle or really large rpm fluctuation although today it started to want to stall out when I went to neutral at lights.

[S13FASTBACKSR]

if you want to check your IACV..then check for resistance. resistance should be approxiamately 10. i just took a picture to show you where to check resistance but my computer wont let me host pictures so i will just tell you..if you notice the 4 wires on the IACV there are 2 that split off to the top and 2 that split off to the bottom. the 2 that split to the bottom (to the cylinder shaped piece) are the wires you check for resistance. the positive needle should go to the one on the left and the negative needle to the one on the right. if it checks out fine then you should check your ecu for codes. this will tell you the problem

[IanS]

any one have the pinout and voltage for the iacv so I can check it I am not getting any surge at idle or really large rpm fluctuation although today it started to want to stall out when I went to neutral at lights.

this kind of stalling is a problem commonly associated with a non recirculated bov

[tucker3113]

no codes on the ecu but is a chipped ecu that came with the swap. I thought that it was the non recirculated bov but I never had it happen untill now. The iacv is fine all checked out on it and the vacume at idle seems ok it is at around 19. The only thing that I changed since this started was I changed my electric fan and used the fan relay to power it. Maybe the wire I used is a signal wire for something else also and that is what is messing it up.

[S13FASTBACKSR]

this kind of stalling is a problem commonly associated with a non recirculated bov

yes this is true..I knew it would be your IACV..IACV only causes bad idle but not that kind of bad idle and it doesnt cause misfiring. could you please list everything you've checked again?

[tucker3113]

I checked the iacv that was fine I checked the tps and that was fine I checked fuel pressure and spark that was fine the mass air flow is ok or seems to be. What does the vacuum look like on your gauge at idle half throttle?. I want to make sure it is not a vacume problem but I smoked the car and could not find a leak. This is one of those problems that just sucks and I bet when we find out what it is it is going to be something stupid. Thanks for all of your help.

[tucker3113]

the only thing that is new to the problem is when coming to a stop after a downshift I get a single loud pop from a back fire.

[S13FASTBACKSR]

my idle sits at 500 on the dot..and backfiring isnt a big deal but it may have something to do with the problem..another thing to check is your injectors..possibly they are not injecting fuel at that moment or too much..also you should put a voltmeter on the tps again and rev to w.o.t. and see if the voltage stops for a second at 3krpm

[2l84u]

Mines doing the same thing. I can rev at 3.5k and it sputters and i can't figure it out. Also some black stuff shoots out the exhaust but i figured it was because i put restore in it and it was breaking some crap down. I'm checking timing this weekend. Will let ya'll know my results.

[sviellvoicae]

wow! same issue here but i can make it to 5k then it does the same thing! we neeed to get to the bottom of this guys its killing me!

[GTS4-R]

mine was at 5k....the tanks was full of rust adn sedimanet and it clogged up the pump and little fliter on the pump (pump was ungodly loud even for a walboro) changed tank, pump and z32 fuel fitler....pulls loike a mofo now

[2l84u]

Its all to do with the timing. Once timing was done, sputter went away. Replaced SP while i was at it.