sr20det boost problems

[sebastianwrx]

hi guys i recently run another problems again with this engine ..yess again ...well at first before i start the car i always warm up the car like 10 min till the temp is normal and rpm below 1k...at first when i drive the car..the car runs fine and perfect ..boost kick in how suppose to be and no lag what so ever...BUT heres the the annoying part ..after i drive maybe a lil hard after 1 hour later or 30 min later seems everytime i step the gas it seems the car hold back or lag for some reason .....i cant figure it out y ...i try to look for the leak or intercooler clamps and it seems fine ...y my car start lagging after i drive for awhile???..its weird cuz it seems fine at first than after 1 hour later the problems start doin it ...please zilvia help me out and thx alot

[steve shadows]

Check your base timing...make sure to use a spark plug wire in the no1 cylindr to pull accurate signal...

[redline racer510]

First warm up your car check timing and go around your vacuum lines and intake with carb cleaner or something similar and check for idle change. See if that works and post results.

[handinpants]

i was gonna say what steve said

[nismolvr]

check fuel pressure regulator ,(could be on its way out),and vacuum hose. Check fuel filter.Fuel pump could also be going bad . make sure you get 12Volts to it.(often overlooked). Most tuners wire a relay to it with heavier gaugue wiring .Alternator could be going bad also.I dont think its your IC piping. Cause if it was it would lag when you first start it.hope this helps ..

[sebastianwrx]

check fuel pressure regulator ,(could be on its way out),and vacuum hose. Check fuel filter.Fuel pump could also be going bad . make sure you get 12Volts to it.(often overlooked). Most tuners wire a relay to it with heavier gaugue wiring .Alternator could be going bad also.I dont think its your IC piping. Cause if it was it would lag when you first start it.hope this helps ..

the fuel pump is new ..is isis fuel pump and i havent check the fuel filter yet but ima check everything by tomorow and post results

[dorifto_demon]

any updates from the op??

i`m having similar problem as well..
my yashio factory temp meter showing code 34, which means knock sensor..

then i changed my knock sensor with a known working one and that did the trick..

but after a few days of driving, it happens again..

then i did the following :-
- triple checked my mechanical timing and base timing with a timing light..
- changed all the vacuum hoses..
- clean the afm with contact cleaner..
- wired up a relay for the fuel pump..
- did a compression test : ard 147 all across (wet tested)..

after that it was ok for a couple of weeks and then it happens again..
the funny thing was, when it was ok, the yashio factory shows code 12 (afm) but it drives fine..
then one day, the afm code went away but code 34 came back and the problem comes again..

dammit..

[sebastianwrx]

i did check everything and everything is fine ..BUT the weird part is that after i did some seafoam it seems everything was fine again

[sebastianwrx]

any updates from the op??

i`m having similar problem as well..
my yashio factory temp meter showing code 34, which means knock sensor..

then i changed my knock sensor with a known working one and that did the trick..

but after a few days of driving, it happens again..

then i did the following :-
- triple checked my mechanical timing and base timing with a timing light..
- changed all the vacuum hoses..
- clean the afm with contact cleaner..
- wired up a relay for the fuel pump..
- did a compression test : ard 147 all across (wet tested)..

after that it was ok for a couple of weeks and then it happens again..
the funny thing was, when it was ok, the yashio factory shows code 12 (afm) but it drives fine..
then one day, the afm code went away but code 34 came back and the problem comes again..

dammit..

check ur fpr or change it to nismo fpr type A ..or but z32 fuel filter ..thats wht the g-dimension told me ..hopefully mine was fine but i do have z32 filter and nismo fpr on the way now ..and i let u guys now

[dorifto_demon]

any updates from op?

[sebastianwrx]

any updates from op?

check the fuel filter trust me ..mine was clogged really bad ..and i changed it and it was fine after that

[nissanpower240sxse]

i have walbro 255 and z32 fuel pump. no fpr yet. but i dont think this is a fuel problem cause there is no cut, just lag. i get full boost my car just goes no where. i have a small boost leak on my throttle body that everyone thinks is the problem but its still to minor to be the problem. anyone else have this leak tho?

[Q.Smooth127]

i think mine is the other way around.
when i start the car from cold start, if i bothered to try driving it before normal operating temp (which i wait anyway till she warm up), the car would lag out when i give it a baby gas step (like fuel isnt wanting to shoot in), but once it warms up to normal temp, no lag whatsoever, drives fine.

[240cody]

my cars also having this problem..haha but i recently put in a new hks 4inch deep fmic. its huge and im onlky boosting at 7. so i was told that was my problem. im hittin boost around 4500rpms. and car drives great at 6am! but at 4pm when is hot it boosts..but i got no where!! its bullshit!! if you fixed it post uup what you did please!! im goin to switch out my fmic in a few days when i have $$

[SilEightyRHD]

im having a similiar issue. Car starts fine and drives good, but when i am cruising in lets say 3rd gear and then try to punch it i get boost but the car acts like its going to stall. I know weird. Hopefully someone is having the same problem. Maybe ff or fp or fpr