sr misses under load - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

sbanzer123 · 05-24-2007, 06:23 PM

i just put my car on the road yesterday. its a s14 with a s14 sr20 pretty much stock besides a front mount and an exhaust. im running stock boost off the wastegate spring. it ran fine yesterday but just today it starting missing when i get under a load. i can ease into the throttle and it will build boost put if i hammer the gas it will go for a second then just die right down in a terrible miss. any help will be greatly appreciated.

myzislow · 05-24-2007, 06:39 PM

check your plugs, if your running to rich they tend to foul.

sbanzer123 · 05-24-2007, 06:46 PM

i checked my plugs out everything looks good. i went through and unplugged the coilpacks one at a time and went and did a pull to see if maybe i had a coilpack go bad. i have no idea what else it could be.

sliEighty · 05-24-2007, 07:59 PM

boost leak... even the smallest will make it do this i had the same problem

sbanzer123 · 05-24-2007, 08:47 PM

it seems like if im doin like 30 and i have it in 4th and i get on the gas it will pull good without missing.

skylindrftr · 05-24-2007, 09:51 PM

Do a leakdown test, get a tire valve, plug it in a vacuum line, get an air compressor with a tire inflater tool, put it at tdc (second notch from the left on the crank pulley lines up with the needle) and put pressure in the system. If you hear any hissing there's your leak, also spray wd40 or soapy water on the suspicious places. If you have a boost gauge you can test how long it takes for the air to leak out of the system which can tell you how bad it is leaking. Oh and don't forget to plug the turbo inlet!

05-24-2007, 06:23 PM	#1
sbanzer123 Zilvia Junkie Join Date: Aug 2006 Location: Buffalo, NY Age: 36 Posts: 534 Trader Rating: (6) Feedback Score: 6 reviews	sr misses under load i just put my car on the road yesterday. its a s14 with a s14 sr20 pretty much stock besides a front mount and an exhaust. im running stock boost off the wastegate spring. it ran fine yesterday but just today it starting missing when i get under a load. i can ease into the throttle and it will build boost put if i hammer the gas it will go for a second then just die right down in a terrible miss. any help will be greatly appreciated. __________________

05-24-2007, 06:46 PM	#3
sbanzer123 Zilvia Junkie Join Date: Aug 2006 Location: Buffalo, NY Age: 36 Posts: 534 Trader Rating: (6) Feedback Score: 6 reviews	i checked my plugs out everything looks good. i went through and unplugged the coilpacks one at a time and went and did a pull to see if maybe i had a coilpack go bad. i have no idea what else it could be. __________________

05-24-2007, 07:59 PM	#4
sliEighty Zilvia Junkie Join Date: Jan 2006 Location: Central pensyltucky Posts: 471 Trader Rating: (3) Feedback Score: 3 reviews	boost leak... even the smallest will make it do this i had the same problem __________________ livin on the east cost is harder then you think... ECM for life lll

05-24-2007, 08:47 PM	#5
sbanzer123 Zilvia Junkie Join Date: Aug 2006 Location: Buffalo, NY Age: 36 Posts: 534 Trader Rating: (6) Feedback Score: 6 reviews	it seems like if im doin like 30 and i have it in 4th and i get on the gas it will pull good without missing. __________________

05-24-2007, 06:39 PM	#2
myzislow Zilvia Junkie Join Date: Aug 2005 Location: seaside ca Posts: 317 Trader Rating: (0) Feedback Score: 0 reviews	check your plugs, if your running to rich they tend to foul.

05-24-2007, 09:51 PM	#6
skylindrftr Zilvia FREAK! Join Date: Apr 2007 Location: Metro Detroit Age: 36 Posts: 1,099 Trader Rating: (26) Feedback Score: 26 reviews	Do a leakdown test, get a tire valve, plug it in a vacuum line, get an air compressor with a tire inflater tool, put it at tdc (second notch from the left on the crank pulley lines up with the needle) and put pressure in the system. If you hear any hissing there's your leak, also spray wd40 or soapy water on the suspicious places. If you have a boost gauge you can test how long it takes for the air to leak out of the system which can tell you how bad it is leaking. Oh and don't forget to plug the turbo inlet!