Sr20det stock is hesitate when you give throttle - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Keefs240sx · 02-21-2012, 08:00 PM

Car hesitate when you give it throttle tried 2 different ecu's an mafs what else could it be ?

*StryfeS13* · 02-21-2012, 08:19 PM

Does your stock rubber intake tube have a spring in it? If not it can collapse under boost.

take your spark plug gap down to .028 and check your coil packs as well

what fuel pump are you running?

Swifty · 02-21-2012, 08:21 PM

Possible weak fuel pump.

Keefs240sx · 02-21-2012, 08:28 PM

Stock fuel pump an will get plugs in the morn. Any other things to check for .

Forgot turbo is after market external gate

Haven't moved it out the driveway yet trying see why it's super hesitate my street is a busy one trying not get stuck in road lol

Pro ViZIon · 02-21-2012, 10:16 PM

Has it always been like this? But I would definitely get a walbro in that tank. They're inexpensive.

Keefs240sx · 02-22-2012, 06:22 AM

I jus got the motor swapped over into my s14 chassis

ma.jomaa · 02-22-2012, 12:37 PM

Quote:

Originally Posted by Keefs240sx

I jus got the motor swapped over into my s14 chassis

Sounds like not enough spark is coming through, I had that happening to my SR and it was loose ground cable, check your power cables and change ur plugs hopefully that will take care of it, oh and check if any of the intercooler pipes came off that could be it too

Croustibat · 02-22-2012, 04:44 PM

If it accelerates if you gently give throttle, but not when you hit it hard, it usually is a weak fuel pump. If it does it all the time, usually a boost leak. And if it does not go above 2500 rpm, it is a MAF related problem (limp mode) => check your MAF wiring .

Keefs240sx · 02-22-2012, 05:32 PM

It's when you try to rev it's hesitate an it's a wire specialties harness too. Maf wiring what do I need to look for?

Jake1992 · 02-22-2012, 06:26 PM

does it even pass certain rpms ? i had a bad 02 sensor then it started sputtering at 2000 to 2500 and wouldnt go forward , got stuck in traffic also....

switched to my power fc ecu , and turned off 02 control.... and it works good , exepct my fuel economy has gone reall bad

Keefs240sx · 02-22-2012, 06:41 PM

New plugs an checked grounds, It won't even go to 1500-2500 an wants to die after it tries to idle back down after a rev really frustrated with it first sr20 I've ever messed with need all the help I can get?

Also I have a skinny o2 sensor is there one I can interchange with. .? If this ones bad?

Jake1992 · 02-23-2012, 06:23 AM

i was misfiring up badly .... i have a pretty thick one on my turbo elbow...

Keefs240sx · 02-23-2012, 08:05 AM

Quote:

Originally Posted by Jake1992

i was misfiring up badly .... i have a pretty thick one on my turbo elbow...

What are you talkin bout?

Anyone any idea need to get my car driving taking days off work to speed up progress so need it fixed

Jake1992 · 02-23-2012, 08:56 AM

Quote:

Originally Posted by Keefs240sx

What are you talkin bout?

Anyone any idea need to get my car driving taking days off work to speed up progress so need it fixed

The o2 sensor... that led my car not reving and misfiring..

Croustibat · 02-23-2012, 09:52 AM

Quote:

Originally Posted by Keefs240sx

New plugs an checked grounds, It won't even go to 1500-2500 an wants to die after it tries to idle back down after a rev really frustrated with it first sr20 I've ever messed with need all the help I can get?

Also I have a skinny o2 sensor is there one I can interchange with. .? If this ones bad?

still going for weak fuel pump and / or boost leak somewhere, and a big one. You sure of all your plumbings ?

try revving the car from engine bay, very gently on the throttle . if it revs, it surely is the fuel pump. If it does not, boost leak. And it could really be both. MAF systems cant work properly with a boost leak.

Edwin562 · 02-23-2012, 09:22 AM

if engine starts, what is the RPMS at idle?

Keefs240sx · 02-23-2012, 09:40 AM

I would say right below 1k so 800-900 it idles an cranks fine jus not able to rev

Keefs240sx · 02-23-2012, 04:11 PM

I have been revving from throttle in the bay it wil rev but very hesitate an sluggish t bolts on all piping but I'll double check the leaks an get a fuel pump

*StryfeS13* · 02-24-2012, 12:47 PM

So your turbo setup is not stock, and you have a motor that needs a lot more fuel than your KA ever did, and you have a stock fuel pump? You need to either buy/borrow a walbro from a friend and see if it solves your problem.

Do you have a boost gauge? You can tell if you have a leak if you have a boost gauge..

Test for boost leaks by using smoke or a DIY tester with a pvc end cap and air compressor (you can find it on the forums)

Keefs240sx · 02-24-2012, 04:20 PM

Ok yes done a leak test an I think my bov is shot an stuck open . Fuel pump on order

*StryfeS13* · 02-24-2012, 04:28 PM

Is it an ebay BOV?

Recirculate it

Keefs240sx · 03-12-2012, 03:48 PM

Got rid of throttle hesitation now when I rev it back fires an goes to about 2000-2500 rpms what can cause this ? Limp mode on ecu? If how you fix it?

*wangan_cruiser* · 03-28-2013, 09:07 PM

i am having hesitation problems as well. i will use all the answers here.

but to op. i dont know if you ever get to fix but can you rev the car pass 3k? if not could be a maf problem.

Chaluska · 03-28-2013, 10:17 PM

if its only hesitating when u give it any throttle, id check your TPS voltage. and tps voltage at the ecu

Chaluska · 03-28-2013, 10:16 PM

have you tried a 3rd MAF? the SR maf's seem to be junk, it might possible that you got 2 bad ones

02-21-2012, 08:00 PM	#1
Keefs240sx Zilvia Junkie Join Date: Oct 2011 Location: Nc Age: 36 Posts: 350 Trader Rating: (0) Feedback Score: 0 reviews	Sr20det stock is hesitate when you give throttle Car hesitate when you give it throttle tried 2 different ecu's an mafs what else could it be ?

02-21-2012, 10:16 PM	#5
Pro ViZIon Zilvia Junkie Join Date: Dec 2008 Location: Las Vegas, NV Age: 34 Posts: 415 Trader Rating: (0) Feedback Score: 0 reviews	Has it always been like this? But I would definitely get a walbro in that tank. They're inexpensive. __________________ 1990 Nissan 240SX w/KA24DE - New project 1984 Mazda RX-7 GSL-SE 13B

03-28-2013, 10:17 PM	#24
Chaluska Zilvia Addict Join Date: May 2008 Location: Missouri City, TX Age: 41 Posts: 997 Trader Rating: (2) Feedback Score: 2 reviews	if its only hesitating when u give it any throttle, id check your TPS voltage. and tps voltage at the ecu __________________

03-28-2013, 10:16 PM	#25
Chaluska Zilvia Addict Join Date: May 2008 Location: Missouri City, TX Age: 41 Posts: 997 Trader Rating: (2) Feedback Score: 2 reviews	have you tried a 3rd MAF? the SR maf's seem to be junk, it might possible that you got 2 bad ones __________________

02-21-2012, 08:21 PM	#3
Swifty Zilvia Junkie Join Date: Jun 2011 Location: New Orleans, LA Posts: 422 Trader Rating: (29) Feedback Score: 29 reviews	Possible weak fuel pump.

02-21-2012, 08:28 PM	#4
Keefs240sx Zilvia Junkie Join Date: Oct 2011 Location: Nc Age: 36 Posts: 350 Trader Rating: (0) Feedback Score: 0 reviews	Stock fuel pump an will get plugs in the morn. Any other things to check for . Forgot turbo is after market external gate Haven't moved it out the driveway yet trying see why it's super hesitate my street is a busy one trying not get stuck in road lol

02-22-2012, 06:22 AM	#6
Keefs240sx Zilvia Junkie Join Date: Oct 2011 Location: Nc Age: 36 Posts: 350 Trader Rating: (0) Feedback Score: 0 reviews	I jus got the motor swapped over into my s14 chassis

02-22-2012, 04:44 PM	#8
Croustibat Nissanaholic! Join Date: Aug 2011 Location: France - Toulouse Age: 44 Posts: 1,851 Trader Rating: (0) Feedback Score: 0 reviews	If it accelerates if you gently give throttle, but not when you hit it hard, it usually is a weak fuel pump. If it does it all the time, usually a boost leak. And if it does not go above 2500 rpm, it is a MAF related problem (limp mode) => check your MAF wiring .

02-22-2012, 05:32 PM	#9
Keefs240sx Zilvia Junkie Join Date: Oct 2011 Location: Nc Age: 36 Posts: 350 Trader Rating: (0) Feedback Score: 0 reviews	It's when you try to rev it's hesitate an it's a wire specialties harness too. Maf wiring what do I need to look for?

02-22-2012, 06:26 PM	#10
Jake1992 Leaky Injector Join Date: Aug 2011 Location: Caribbean/ Shipping add FL Posts: 137 Trader Rating: (2) Feedback Score: 2 reviews	does it even pass certain rpms ? i had a bad 02 sensor then it started sputtering at 2000 to 2500 and wouldnt go forward , got stuck in traffic also.... switched to my power fc ecu , and turned off 02 control.... and it works good , exepct my fuel economy has gone reall bad

02-22-2012, 06:41 PM	#11
Keefs240sx Zilvia Junkie Join Date: Oct 2011 Location: Nc Age: 36 Posts: 350 Trader Rating: (0) Feedback Score: 0 reviews	New plugs an checked grounds, It won't even go to 1500-2500 an wants to die after it tries to idle back down after a rev really frustrated with it first sr20 I've ever messed with need all the help I can get? Also I have a skinny o2 sensor is there one I can interchange with. .? If this ones bad?

02-23-2012, 06:23 AM	#12
Jake1992 Leaky Injector Join Date: Aug 2011 Location: Caribbean/ Shipping add FL Posts: 137 Trader Rating: (2) Feedback Score: 2 reviews	i was misfiring up badly .... i have a pretty thick one on my turbo elbow...

02-23-2012, 09:22 AM	#16
Edwin562 Post Whore! Join Date: Nov 2009 Location: Whittier (562) Age: 35 Posts: 4,721 Trader Rating: (35) Feedback Score: 35 reviews	if engine starts, what is the RPMS at idle?

02-23-2012, 09:40 AM	#17
Keefs240sx Zilvia Junkie Join Date: Oct 2011 Location: Nc Age: 36 Posts: 350 Trader Rating: (0) Feedback Score: 0 reviews	I would say right below 1k so 800-900 it idles an cranks fine jus not able to rev

02-23-2012, 04:11 PM	#18
Keefs240sx Zilvia Junkie Join Date: Oct 2011 Location: Nc Age: 36 Posts: 350 Trader Rating: (0) Feedback Score: 0 reviews	I have been revving from throttle in the bay it wil rev but very hesitate an sluggish t bolts on all piping but I'll double check the leaks an get a fuel pump

02-24-2012, 04:20 PM	#20
Keefs240sx Zilvia Junkie Join Date: Oct 2011 Location: Nc Age: 36 Posts: 350 Trader Rating: (0) Feedback Score: 0 reviews	Ok yes done a leak test an I think my bov is shot an stuck open . Fuel pump on order

03-12-2012, 03:48 PM	#22
Keefs240sx Zilvia Junkie Join Date: Oct 2011 Location: Nc Age: 36 Posts: 350 Trader Rating: (0) Feedback Score: 0 reviews	Got rid of throttle hesitation now when I rev it back fires an goes to about 2000-2500 rpms what can cause this ? Limp mode on ecu? If how you fix it?

03-28-2013, 09:07 PM	#23
wangan_cruiser kouki man Join Date: Apr 2006 Location: downtown oakland,ca Age: 40 Posts: 3,539 Trader Rating: (36) Feedback Score: 36 reviews	i am having hesitation problems as well. i will use all the answers here. but to op. i dont know if you ever get to fix but can you rev the car pass 3k? if not could be a maf problem.