Sr runs crappy under load...revs perfect in neutral LOL - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

the3SecondJerk · 08-06-2003, 12:22 AM

Exactly what it says... My Sr in the garage runs great idles nice revs fast and smooth. When I leave the garage and go to the road its a different story. Under load, it spits kicks and sputters. Thought possible vaccuum leak but cant really find anything. Maybe a fuel problem? Have 255lph pump. Hks ssqv. stock IC. Also using all emission control items such as carbon canister, AIV, etc. Please help me! Need car soon!

Thanks to everyone that can help, in advance!

Dan

sil80phobia · 08-06-2003, 12:49 AM

sounds a lot like a boost leak.. see this thread:
http://www.zilvia.net/f/showthread.p...threadid=33652

MovinUp-1 · 08-06-2003, 07:12 AM

or an electrical problem. Check your grounds and make sure your positive connection is good.

sil80phobia · 08-06-2003, 10:49 AM

a few other items to check

- plugs
- do you have a fuel pressure gauge hooked up?

when you punch it, does it even hit/maintain boost?

the3SecondJerk · 08-06-2003, 09:29 PM

OK so the problem was a ground. But when I punch it the turbo screams like it is boosting but the power just isn't there. The hks ssqv let's out pressure fine when I let off, but again it feels like the engine is choking or something the power just doesn't egual the sound the engine, turbo , bov make though. Any ideas? I am checking all piping in the morning I think maybe some hoses aren't tight enough.

s0ldats · 08-06-2003, 11:58 PM

Quote:

Originally posted by sidewayzCA18
OK so the problem was a ground. But when I punch it the turbo screams like it is boosting but the power just isn't there. The hks ssqv let's out pressure fine when I let off, but again it feels like the engine is choking or something the power just doesn't egual the sound the engine, turbo , bov make though. Any ideas? I am checking all piping in the morning I think maybe some hoses aren't tight enough.

leakage, dawg. (actually i don't know... but it sounds like it)

DudeYourSoOOJDM · 08-07-2003, 01:03 AM

What does your boost gauge tell you?

If you dont have one...now would be a good time to invest.

There are many things it COULD be.....could be bad plugs,coilpacks, ignitor chip, MAFS wigging out, bad ground, fuel pump dying, bad FPR.......its gonna be a process of elimination.

try to distinguish whether you problem is fuel or spark related.....that helps narrowing it down.

Who knows, it could be as simple as a hose clamp loose....or maybe a hose w/ a crack tht is not noticeable but only cracks open under load.

08-06-2003, 12:22 AM	#1
the3SecondJerk Zilvia Junkie Join Date: Jul 2002 Location: Fort Collins, CO Posts: 305 Trader Rating: (3) Feedback Score: 3 reviews	Sr runs crappy under load...revs perfect in neutral LOL Exactly what it says... My Sr in the garage runs great idles nice revs fast and smooth. When I leave the garage and go to the road its a different story. Under load, it spits kicks and sputters. Thought possible vaccuum leak but cant really find anything. Maybe a fuel problem? Have 255lph pump. Hks ssqv. stock IC. Also using all emission control items such as carbon canister, AIV, etc. Please help me! Need car soon! Thanks to everyone that can help, in advance! Dan __________________ Drive it like you stole it.

08-06-2003, 12:49 AM	#2
sil80phobia Join Date: Jul 2003 Location: Los Angeles Posts: 31 Trader Rating: (0) Feedback Score: 0 reviews	sounds a lot like a boost leak.. see this thread: http://www.zilvia.net/f/showthread.p...threadid=33652 __________________ ======== Dave

08-06-2003, 07:12 AM	#3
MovinUp-1 Zilvia Member Join Date: Jul 2002 Location: Now I'm in Texas Posts: 243 Trader Rating: (0) Feedback Score: 0 reviews	or an electrical problem. Check your grounds and make sure your positive connection is good. __________________ Allen Delta Region SCCA SM 1990 240SX SR20DET

08-06-2003, 10:49 AM	#4
sil80phobia Join Date: Jul 2003 Location: Los Angeles Posts: 31 Trader Rating: (0) Feedback Score: 0 reviews	a few other items to check - plugs - do you have a fuel pressure gauge hooked up? when you punch it, does it even hit/maintain boost? __________________ ======== Dave

08-06-2003, 09:29 PM	#5
the3SecondJerk Zilvia Junkie Join Date: Jul 2002 Location: Fort Collins, CO Posts: 305 Trader Rating: (3) Feedback Score: 3 reviews	OK so the problem was a ground. But when I punch it the turbo screams like it is boosting but the power just isn't there. The hks ssqv let's out pressure fine when I let off, but again it feels like the engine is choking or something the power just doesn't egual the sound the engine, turbo , bov make though. Any ideas? I am checking all piping in the morning I think maybe some hoses aren't tight enough. __________________ Drive it like you stole it.

08-07-2003, 01:03 AM	#7
DudeYourSoOOJDM Zilvia Junkie Join Date: Jan 2003 Location: Palmdale CA Age: 42 Posts: 479 Trader Rating: (0) Feedback Score: 0 reviews	What does your boost gauge tell you? If you dont have one...now would be a good time to invest. There are many things it COULD be.....could be bad plugs,coilpacks, ignitor chip, MAFS wigging out, bad ground, fuel pump dying, bad FPR.......its gonna be a process of elimination. try to distinguish whether you problem is fuel or spark related.....that helps narrowing it down. Who knows, it could be as simple as a hose clamp loose....or maybe a hose w/ a crack tht is not noticeable but only cracks open under load.