SR20DET Hesitation - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

240msh · 01-10-2018, 12:05 PM

The motor is hesitating going into boost, but after will be fine, but still seems a little slower from when I had this motor in my last chassis. Im running the pbm highmount intercooler now vs the old isr setup I had, itll be super sluggish like an anti turbo for like 800rpms between 2600 3400. If I advance timing it gets worse, and if i retard it, itll slightly get better. Ive swapped out injectors, fuel rail, coilpacks, throttle bodies, iacv, intake manifold, all new gaskets on everything, vacuum lines, wastegates, exhaust gasket, coilpack harness, cam angle sensors, and spark plugs. Still does the same thing, it also wont go into timing mode unless i manually do it using the consult port and the nissan database. Even then itll still act funny like if its idling high, but cant find a leak anywhere. Ive sprayed cans of starter fluid and soapy water.. nothing. If anyone has had the same problem let me know. Motor use to run fine

Timing, Knock Sensor, and possibly issue with solid motor mounts.

unicoder · 01-10-2018, 02:44 PM

Sounds exactly like a boost leak man. Is your MAF setup as a draw through still? Seriously pressurize it and check for leaks.

I know you said you took a bottle to it, but did you cap off the pipes and pressurize them too?

How tight is your bov adjusted? is it letting boost out from being set too soft?

240msh · 01-10-2018, 06:55 PM

Quote:

Originally Posted by unicoder

Sounds exactly like a boost leak man. Is your MAF setup as a draw through still? Seriously pressurize it and check for leaks.

I know you said you took a bottle to it, but did you cap off the pipes and pressurize them too?

How tight is your bov adjusted? is it letting boost out from being set too soft?

No boost leaks, pressurized it all the way up to like 22psi and nothing.

Maf is like 14 inches away from turbo, im using the pbm intake

No bov, using pbm intercooler pipping and stock turbo.

*blksylv* · 01-10-2018, 06:59 PM

It's not throwing any codes?

Kingtal0n · 01-11-2018, 12:55 AM

did you seriously just ask if it threw any codes

*blksylv* · 01-11-2018, 04:44 AM

Yea I did...

ultimateirving · 01-15-2018, 09:12 PM

You said you swapped coil pack, with known working ones?

Even one bad pack can make it run like crap. Took me some time to diagnose when i had a similar issue. My SR would idle and cruise around fine but as soon as boost came on would break up and sputter like crazy. Bad coilpack turned out to be the issue.

Can you describe what you are experiencing in more depth or take a video with a gopro or better quality camera

nissansrdub · 02-11-2018, 11:12 AM

Chipped ecu?
I have this same hesitation
I have had a RS ecu for 3 years. Just found out it tuned for 93 octane. I use 91. And old owner asked for more fuel. I was never told this by old seller but I never asked
We’ll see soon

Sent from my iPhone using Tapatalk

Speed9117 · 02-11-2018, 11:42 PM

Hmmm following. I have been having a similar intermittent issue with my car. I've run through a pretty similar list to yours for troubleshooting...

240msh · 09-25-2018, 03:42 PM

Bypassed the knock sensor with a 1megaohm resistor and fixed the issue, timing was slightly off on cas. I really think solid motor mounts played part in the issue aswell, hopefully this helps someone one day.

RomulanS13 · 10-07-2018, 03:55 PM

Check your brake booster could be leaking there. Just did mine and i had a leak at the check valve between brake booster so i put a hose clamp there also my cheap ass blow off valve was leaking under boost.

fitbmx180 · 10-07-2018, 07:54 PM

Quote:

Originally Posted by RomulanS13

Check your brake booster could be leaking there. Just did mine and i had a leak at the check valve between brake booster so i put a hose clamp there also my cheap ass blow off valve was leaking under boost.

he resolved the issue

01-10-2018, 12:05 PM	#1
240msh Zilvia Member Join Date: Oct 2016 Location: Las Vegas Age: 22 Posts: 234 Trader Rating: (1) Feedback Score: 1 reviews	SR20DET Hesitation The motor is hesitating going into boost, but after will be fine, but still seems a little slower from when I had this motor in my last chassis. Im running the pbm highmount intercooler now vs the old isr setup I had, itll be super sluggish like an anti turbo for like 800rpms between 2600 3400. If I advance timing it gets worse, and if i retard it, itll slightly get better. Ive swapped out injectors, fuel rail, coilpacks, throttle bodies, iacv, intake manifold, all new gaskets on everything, vacuum lines, wastegates, exhaust gasket, coilpack harness, cam angle sensors, and spark plugs. Still does the same thing, it also wont go into timing mode unless i manually do it using the consult port and the nissan database. Even then itll still act funny like if its idling high, but cant find a leak anywhere. Ive sprayed cans of starter fluid and soapy water.. nothing. If anyone has had the same problem let me know. Motor use to run fine Timing, Knock Sensor, and possibly issue with solid motor mounts. Last edited by 240msh; 09-25-2018 at 03:43 PM.. Reason: Should help someone someday

01-10-2018, 02:44 PM	#2
unicoder Zilvia Member Join Date: Apr 2017 Location: Alabama Posts: 160 Trader Rating: (2) Feedback Score: 2 reviews	Sounds exactly like a boost leak man. Is your MAF setup as a draw through still? Seriously pressurize it and check for leaks. I know you said you took a bottle to it, but did you cap off the pipes and pressurize them too? How tight is your bov adjusted? is it letting boost out from being set too soft? __________________ 5.3 V8 Swap w/ Nitrous

01-15-2018, 09:12 PM	#7
ultimateirving Zilvia FREAK! Join Date: Nov 2010 Location: arizona Age: 33 Posts: 1,519 Trader Rating: (1) Feedback Score: 1 reviews	You said you swapped coil pack, with known working ones? Even one bad pack can make it run like crap. Took me some time to diagnose when i had a similar issue. My SR would idle and cruise around fine but as soon as boost came on would break up and sputter like crazy. Bad coilpack turned out to be the issue. Can you describe what you are experiencing in more depth or take a video with a gopro or better quality camera __________________ Z32 with lq4 swap Desert Street Scene \|\| Dssevents.com

02-11-2018, 11:12 AM	#8
nissansrdub Zilvia Junkie Join Date: Apr 2007 Location: Denver Colorado Posts: 500 Trader Rating: (3) Feedback Score: 3 reviews	SR20DET Hesitation Chipped ecu? I have this same hesitation I have had a RS ecu for 3 years. Just found out it tuned for 93 octane. I use 91. And old owner asked for more fuel. I was never told this by old seller but I never asked We’ll see soon Sent from my iPhone using Tapatalk

09-25-2018, 03:42 PM	#10
240msh Zilvia Member Join Date: Oct 2016 Location: Las Vegas Age: 22 Posts: 234 Trader Rating: (1) Feedback Score: 1 reviews	Bypassed the knock sensor with a 1megaohm resistor and fixed the issue, timing was slightly off on cas. I really think solid motor mounts played part in the issue aswell, hopefully this helps someone one day. __________________ IG @Michayyl

01-11-2018, 12:55 AM	#5
Kingtal0n Post Whore! Join Date: Jul 2005 Location: South Florida Age: 38 Posts: 4,649 Trader Rating: (17) Feedback Score: 17 reviews	did you seriously just ask if it threw any codes

02-11-2018, 11:42 PM	#9
Speed9117 Join Date: Feb 2016 Location: PNW Posts: 22 Trader Rating: (2) Feedback Score: 2 reviews	Hmmm following. I have been having a similar intermittent issue with my car. I've run through a pretty similar list to yours for troubleshooting...

10-07-2018, 03:55 PM	#11
RomulanS13 Join Date: Oct 2017 Location: near salty oceans Posts: 30 Trader Rating: (0) Feedback Score: 0 reviews	Check your brake booster could be leaking there. Just did mine and i had a leak at the check valve between brake booster so i put a hose clamp there also my cheap ass blow off valve was leaking under boost.

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