LS/VTEC no low end power....help
 

well i finally got my LS/VTEC in, and i got it running.
i have a vacume leek, somewhere?,
car now idles up and down, up and down..........


yesterday sentra SER, (header intake, exhaust)
and i am happy to say i beat him, tie in first and early second, but late second i was gone, and third he was smoked.
so basically the first few days went OK.

last night i reseal the TB, and the reving was finally stable.

Today i drove it and the bottom end was GONE, no power,
the car had no power up to 4000 rpm then it would just kick in HARD, and the car runs find above 4k rpm.
and some times it back fires below 4k......this morning on the way to work i parked in a lot, and noticed the distributor bolts was a little loose, so i advanced it a little pass center, and tighen the bolt. and then the bottom end came back for a little, again it is gone...PLUS the idle is fu_ked up again, (up,down,up,down, MAX 2k rpm).

I dont wanny start tearing down shyt, just to find out it was just a little problem.

My performance setup
96 integra LS
00 GSR tranny
B18B block (stock block)
B16A head (milled, 2 layer gasket, 10.2:1 CR)
00 civic SI ECU (OBD2-1 to OBD2-2 adaptor harness)
stock header,
stock exhaust.
stock intake.

(i have yet to install the skunk2 manifold, and header, but first i need to get car running properly)

Re:LS/VTEC no low end power....help
 

hrrrrrrrrmmmmmmmmm........ that sucks! i'm about to tear down my 00 si and make an lsvtec, i don't want to hear stories like this :P

Re:LS/VTEC no low end power....help
 

this is my forth LS/VTEC and i have never had this problem before.

and even with this problem, i DEF think it was worth the setup.

i am mad happy with the car now.

Re:LS/VTEC no low end power....help
 

maybe a b16a ecu is starvin the b18 for fuel? :)

Re:LS/VTEC no low end power....help
 

that's what i was thinking........

Re:LS/VTEC no low end power....help
 

i doubt that is the problem.

Re:LS/VTEC no low end power....help
 

i bet it is my buddy tried running a b18c5 in his crx with a pr3 b16 ecu and it ran like anus

Re:LS/VTEC no low end power....help
 

the b16 ECU is killing you engine, I'm running my LS VTEC with a P30, VAFC and 450's. I had to REALLY richen up my initial settings, I'm running between -27 to -22 through the rpm band. And by the way, it sucks the gas when you hit VTEC lobes.

Re:LS/VTEC no low end power....help
 

I have the same problem with my single vtec. It feels like I have 10 hp till about 10-15mph then BAM! All hell brakes loose. I thought that it was my map sensor cuz it wasn't hooked up but I hooked it up and that just made it a little faster. I still have a hole down low. It is either too much fuel or something else.

Re:LS/VTEC no low end power....help
 

I agree.. I bet you a wideband o2 on your car, and you would ---- your pants if you saw how lean your A/F's are.. get that fucker some more fuel, and tune it, I bet its just fine, its just needs to be tuned properly. :)

good luck,
Jeff

Re:LS/VTEC no low end power....help
 

well guess what guys, i fixed 90% of the problem, the Idle air control was bad (i changed that) AND i had a vacume leak on the intake manifold gasket (changed that too) then i changed the TB gasket, and the bottom end is alot better.

but i still feel a slight lag below 3500-4000, so an adjustable fuel pressure regulator is next to be installed.

the car idles GREAT, and it feels alot better.

Re:LS/VTEC no low end power....help
 

bwahahaha! i just had the same problem with my car! had a leak in my tb gasket and the o ring around the iac valve.

Re:LS/VTEC no low end power....help
 

I don't even have a throttle body gasket. I will get one tomarrow.

Re:LS/VTEC no low end power....help
 

Well I fixed the sticky throttle body but I still have a problem with my lower end. Plus when it warms up I have a bouncing idle. I might have some coolent lines mixed up or something. Anybody have any ideas?

Re:LS/VTEC no low end power....help
 

still have a vac leak somewhere.

Re:LS/VTEC no low end power....help
 

Yeah I fixed my bouncing idel by looking at the coolent lines. Right under the throttle body is where you can get into trouble. The coolent lines that come out of the intake maifold should go into the throttle body and some other ----. when it exits that part it should go into the therostat houseing. In some intake manifolds you will have a nippple left over. Just use a hose and clamp it on there and then block off that nipple.

Re:LS/VTEC no low end power....help
 

untill you get a chance to add more fuel, It might help abit to set your timing at around 18-19 base. B16's run about 3-4degrees less timing than b18's.

Have access to a FPR? adding 4-5psi should get you close with the fuel.

Your plugs are a bit white huh?