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throttle response lag

Discussion forum of the Nissan Ecology Orientated Variable Valve Lift and Timing engine. Discussion on all variants of VE engines including the VET and 20V models. Please also use this forum for all SRxxDE(T) specific questions.
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layllz
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Name: allan
Engine Code: SR16VE
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throttle response lag

#35899

Post by layllz » Wed Sep 11, 2013 11:21 am

Hello fellow SR gurus, once again I seek your assistance :)

for a long while now I've had this troublesome lag especially at bottom of the rev range, it's inconsistent and when it is present (which is more than 60% of the time) there is a lack of power when switching cams.
I waited a while to see if the head rebuild would fix it, it didn't. Neither did changing to solid engine mount bushings. Changed sparks, cleaned MAF sensor, cleaner IACV...yet nothing. Does not seem to be affected by weather or any patterns I can pick up.

My mechanic's scantool and the nissan shops here won't communicate with the ecu, does anyone have any suggestions like a bluetooth attachment that can read my ecu? I'm in aussie and the problem is probs it's jdm ey...

My mech suspects either MAF or TPS, but would be good to get a proper diagnostic first. He wants to swap another OEM ecu in it and see if it does anything cuz he also reckons the ecu has been played with back in japan...but I'm like "that's not gonna be easy to find" lol

What are your thoughts or concerns?
sr16ve N1 btw

allan

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TheStigP11GT
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Joined: Sun Aug 06, 2006 10:24 pm
Name: Chris
Car: Nissan Primera P11 GT
Engine Code: SR20VE.N1
1/4 Mile Time: 16.605
Daily Driver: Nissan Qashqai
Location: Dunfermline, Fife
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Age: 34
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Re: throttle response lag

#35901

Post by TheStigP11GT » Wed Sep 11, 2013 12:28 pm

Hey Allan, Sounds like it could be a fuelling issue, and could be down the ECU, There is a company in Australia called PLMS developments, They sell Cables for the OBD1 Nissan ECU, that with using Nissan Data Scan software can do diagnostics,

I would check the TPS voltage on close throttle, this can be done with a multimeter, the voltage should be between 0.45v and 0.5v.

Also make sure your timing is set to 5* for the VE ecu's.

There is other options you can use than a N1 ecu, you could get an SR20DE ecu, with Loom from a Pulsar, and have Nistune Fitted a remap done will solve that issue, however this is a last resort, personally I don't think it is an ECU issue, other wise it probably wont even run. they are only 8 bit ECU's.

Also have you changed the fuel filter recently? also check the fuel pump. might be worth swapping the back injectors with the front ones and see if the problem improves.
Current Cars
Primera GT SR20VE N1 / Qashqai 1.5 dCI
http://www.neovvl.com

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TheSam
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Re: throttle response lag

#35904

Post by TheSam » Thu Sep 12, 2013 9:13 am

Base ignition timing is 10deg for the N1.

I've got a blatz obd cable you could have that would allow you to connect to ecutalk/consult.

Ive also got a powerland N1 ecu sat here..

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sss4me
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Engine Code: sr20ve
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Re: throttle response lag

#35905

Post by sss4me » Thu Sep 12, 2013 10:34 am

beg, borrow or steal a device to read your sensors and error codes. could be a dozen different things.

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layllz
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Re: throttle response lag

#35908

Post by layllz » Sat Sep 14, 2013 11:55 am

awesome, thanks guys.
been in contact with pete from PLMS developments and should be sourcing a cable from him very soon.
fuel filter and pump not since importing which was about 2 years, they were supposedly new at the time from compliance workshop, i'll look into it.
also...can't seem to locate the secondary injectors? is that what u mean by swapping them Stig? n1 is meant to have 8 right? or so i thought

cheers sam where abouts are you located in case i need?


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TheStigP11GT
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Posts: 10034
Joined: Sun Aug 06, 2006 10:24 pm
Name: Chris
Car: Nissan Primera P11 GT
Engine Code: SR20VE.N1
1/4 Mile Time: 16.605
Daily Driver: Nissan Qashqai
Location: Dunfermline, Fife
Gender: Male - Male
Age: 34
Contact:

Re: throttle response lag

#35909

Post by TheStigP11GT » Sat Sep 14, 2013 12:15 pm

You got a picture of you engine bay?
Current Cars
Primera GT SR20VE N1 / Qashqai 1.5 dCI
http://www.neovvl.com

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sss4me
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Re: throttle response lag

#35911

Post by sss4me » Sun Sep 15, 2013 12:05 pm

check out this image. see the injectors holes 1/2 way up the runners. this is where yours should be.

http://i.ebayimg.com/t/Nissan-14003-1N5 ... !~~_35.JPG

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layllz
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Re: throttle response lag

#35912

Post by layllz » Sun Sep 15, 2013 1:53 pm

I see, so it's on the underside? So troublesome lol

Stig I'll get a pic in the next day or so once I get some daylight lol

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