SR20 Leak? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Highboost180SX · 10-16-2008, 02:35 PM

So i have been having a problem with my Sr20 recently, once it hits boost my AFR's peg at 10:1. The car was tuned for around 11.5-11.7 AFR but now it is not the case. My first thought was boost leak, I pressurized the piping and found a big boost leak. Fixed the leak and a couple other small ones and thought my problem would be solved. Wrong, car still runs pig rich and i cant figure it out. After some searching some have had a problem with leaky injectors, which my car shows symptoms of sometimes (white smoke at idle, the thick kind and it smells like my car dumped raw fuel on the ground). Here is the thing, I cant find anyone having a leaky injector problem with a topfeed fuel system, can topfeeds leak in a way to cause an extreme rich condition? I dont think i can test my injectors they way one would with sidefeeds? Also is there a way to test for a boost leak somewhere on the intake mani? i assume it wont hold pressure due to the valves being open and I want to eliminate leak on the manifold. Any help would be greatly appreciated, I am tired of my car fouling out plugs after 4-5 days and I cant seem to get this problem solved.

Thanks in advance

Highboost180SX · 10-16-2008, 08:45 PM

No one???....

Sileighty_85 · 10-16-2008, 08:58 PM

What brand are the injectors?

check your Coolant temp sensor,might have crapped out

clean MAF also

and check to make sure the ECU is Grounded properly

Mine came loose on time and it was runnin really rich, regrounded the ECU and problem went away.

Highboost180SX · 10-16-2008, 09:01 PM

Quote:

Originally Posted by Sileighty_85

What brand are the injectors?

check your Coolant temp sensor,might have crapped out

clean MAF also

and check to make sure the ECU is Grounded properly

Mine came loose on time and it was runnin really rich, regrounded the ECU and problem went away.

Injectors are MSD #50's, Coolant temp sensor is 1 year new, I will clean the MAF and check to see if the ecu is grounded properly. Anybody have any experience with the stock manifold leaking anywhere in particular???

Thanks for the suggestions Sileighty, I will check those first thing in the AM.

Oh yea, fuel pressure is 40 at idle with the hose one, and compression is 165 across the board.

Sileighty_85 · 10-16-2008, 09:04 PM

kinda hard for the intake manifold to leak they use metal gaskets

see if you can pull any codes from the ECU too.

how did you get 165??? Adverage is like 150psi, are you runnging higher comp pistons?

Highboost180SX · 10-16-2008, 10:10 PM

Quote:

Originally Posted by Sileighty_85

kinda hard for the intake manifold to leak they use metal gaskets

see if you can pull any codes from the ECU too.

how did you get 165??? Adverage is like 150psi, are you runnging higher comp pistons?

What I should have said was a leak from the manifold, at one of the hoses etc, just wondering if any of the hidden ones are prone to failing and how could I test it. The car is running a PowerFC, and I was curious in regards to the high compression test numbers as well. I chalked it up to carbon buildup on the pistons. The car was imported used from japan so I am not 100% sure whats in the block but I am pretty sure its stock.

Sileighty_85 · 10-16-2008, 10:17 PM

IACV is really the only hose under there.
All the other hoses are Coolant

Whats your timing set at?

singlecamslam · 10-16-2008, 10:17 PM

cant you pull the fuel rail and turn the ignition swith to ON and see if the injectors leak? You could have a vacuum leak thats possible.

Highboost180SX · 10-16-2008, 10:35 PM

Timing is 15 degrees at idle, can I use the standard injector leak test (unbolting rail etc) with topfeeds?

10-16-2008, 02:35 PM	#1
Highboost180SX Leaky Injector Join Date: Mar 2006 Location: Bahamas Posts: 91 Trader Rating: (0) Feedback Score: 0 reviews	SR20 Leak? So i have been having a problem with my Sr20 recently, once it hits boost my AFR's peg at 10:1. The car was tuned for around 11.5-11.7 AFR but now it is not the case. My first thought was boost leak, I pressurized the piping and found a big boost leak. Fixed the leak and a couple other small ones and thought my problem would be solved. Wrong, car still runs pig rich and i cant figure it out. After some searching some have had a problem with leaky injectors, which my car shows symptoms of sometimes (white smoke at idle, the thick kind and it smells like my car dumped raw fuel on the ground). Here is the thing, I cant find anyone having a leaky injector problem with a topfeed fuel system, can topfeeds leak in a way to cause an extreme rich condition? I dont think i can test my injectors they way one would with sidefeeds? Also is there a way to test for a boost leak somewhere on the intake mani? i assume it wont hold pressure due to the valves being open and I want to eliminate leak on the manifold. Any help would be greatly appreciated, I am tired of my car fouling out plugs after 4-5 days and I cant seem to get this problem solved. Thanks in advance __________________

10-16-2008, 08:45 PM	#2
Highboost180SX Leaky Injector Join Date: Mar 2006 Location: Bahamas Posts: 91 Trader Rating: (0) Feedback Score: 0 reviews	No one???.... __________________

10-16-2008, 08:58 PM	#3
Sileighty_85 Post Whore! Join Date: Dec 2006 Location: Misawa, Japan Posts: 6,815 Trader Rating: (8) Feedback Score: 8 reviews	What brand are the injectors? check your Coolant temp sensor,might have crapped out clean MAF also and check to make sure the ECU is Grounded properly Mine came loose on time and it was runnin really rich, regrounded the ECU and problem went away. __________________ 後輪駆動車１番 1989 Built SR GT2871R -363whp 1998 S14 W/RB25- 250ish (For Now) 1986 SR86 - 200ish 1990 R32 GTR - 320hp Don't Buy Engines from JDM-Online http://zilvia.net/f/businesses/207457-jdm-online.html Don't Buy XS-Power or SSAC Shit

10-16-2008, 10:17 PM	#7
Sileighty_85 Post Whore! Join Date: Dec 2006 Location: Misawa, Japan Posts: 6,815 Trader Rating: (8) Feedback Score: 8 reviews	IACV is really the only hose under there. All the other hoses are Coolant Whats your timing set at? __________________ 後輪駆動車１番 1989 Built SR GT2871R -363whp 1998 S14 W/RB25- 250ish (For Now) 1986 SR86 - 200ish 1990 R32 GTR - 320hp Don't Buy Engines from JDM-Online http://zilvia.net/f/businesses/207457-jdm-online.html Don't Buy XS-Power or SSAC Shit

10-16-2008, 10:17 PM	#8
singlecamslam Post Whore! Join Date: Apr 2008 Location: Norcal Posts: 2,534 Trader Rating: (10) Feedback Score: 10 reviews	cant you pull the fuel rail and turn the ignition swith to ON and see if the injectors leak? You could have a vacuum leak thats possible. __________________ Nothing says racecar like a stock car with no interior.

10-16-2008, 09:04 PM	#5
Sileighty_85 Post Whore! Join Date: Dec 2006 Location: Misawa, Japan Posts: 6,815 Trader Rating: (8) Feedback Score: 8 reviews	kinda hard for the intake manifold to leak they use metal gaskets see if you can pull any codes from the ECU too. how did you get 165??? Adverage is like 150psi, are you runnging higher comp pistons? __________________ 後輪駆動車１番 1989 Built SR GT2871R -363whp 1998 S14 W/RB25- 250ish (For Now) 1986 SR86 - 200ish 1990 R32 GTR - 320hp Don't Buy Engines from JDM-Online http://zilvia.net/f/businesses/207457-jdm-online.html Don't Buy XS-Power or SSAC Shit

10-16-2008, 10:35 PM	#9
Highboost180SX Leaky Injector Join Date: Mar 2006 Location: Bahamas Posts: 91 Trader Rating: (0) Feedback Score: 0 reviews	Timing is 15 degrees at idle, can I use the standard injector leak test (unbolting rail etc) with topfeeds? __________________