This has been irritating me for quite some time now. I get a bit of surging between 2000 and 3000RPM and on occasion I put my foot down and it hesitates quite badly (No N/A jokes, please ). I've searched a fair few times for various things, here are all the things that I've changed with known working components; FPCU ECU ATCU TPS CAS Checked Timing Blocked off EGR vacuum line, but advice from a tuning shop leads me to believe that the valve may not be seating properly. Thus leading to aforementioned hesitation/surging. If anyone has any further advice to offer on this topic feel free It's been plaguing me for a while now... Quite irritating after a while.
If its not running in retard mod then it sounds like a afm issue. Get / borrow a Nistune ECU plug in and check the console.
What fuel are you putting in.... Check your spark plug colour... and do a plug chop at the revs it happens at... should help narrow it down.
Change your O2 sensors. Had the exact same issue with my first NZ Z32, it took a lot of my wasted time telling mechanics to change the sensors, having them perform test & say they are fine, but the problem persisting. In the end I pretty much ordered someone to change them (was a warranty claim so a pain in the ass) & what do ya know the problem was solved instantly!! Your surging will be while you are trying to cruise at a constant speed & the stutter/stumble is just as you try to move away from an idle correct?
conzult is your friend.... $30 bucks from china buys you a alrady made cable. yeah check all sensors and go through the hesitation guides http://zhome.com/ZCMnL/PICS/hesitation/hesitation.html
That is quite correct indeed mungyz! I will see what I can do about getting some new O2's in for testing!
It's been checked for codes, nothing coming up Have had it hooked up to one while it's been running through that rev range and nothing looked amiss
Does it happen all the time or is it an intermittent problem, perhaps it is not the components that are the problem but the connections, try cleaning your electrical connections, contact cleaner, and some really small files will do the trick
The may sound strange but have you tried changing the air filter? Mine is experiencing the same problem only because the filter doesn't have proper flow being wedged between the fmic and fan.
I have, yeah. Tried it with my pod filter and my AFM my pod filter and a different AFM panel filter and my AFM panel filter and a different AFM
ok not sure if this will work on Z32 (havent tried it yet) but it works on s14. quickest way to check if 02 sensor is the problem is to disconnect it. on s14 it runs on safe mode uses bit more fuel but hesitations/ surges should go away if its got to do with o2 sensor. if u plug it back in it should return to hesitation and running like crap while cruising around that rpm range. Ive currently disconnected my s14 one as it was shutting the engine off when stopping different issue but had similar problem with the RB20DET which proven to be the O2.ordered new sensor awaiting arrival. but on z32 i would disconnect both o2 and check it out. hope it helps.
fuel pumps good? if not replace passenger seat, clean the rear hatch glass and polish your tow hook. if no change.. sell it.
Wont work, tried it with my one & it ran exactly the same so hard to confirm if it is faulty O2s or not that way. they will be faulty I will be ashamedbadmostachmans left arm.
What does it do exactly? Can you slowly accelerate the engine to full rpm, but as soon as you go over a set throttle it will stumble? If its on mild throttle 2k-3k rpm it can be the o2`s sure. If its more on full throttle 2-3k it isnt even using the o2`s, its on a different part of the map. I still say the AFM and or CAS units or their plugs. TPS is correct also right?
It is on mild throttle between 2-3k. It bogs down when I plant my foot from idle as well though.. As I said, I have changed the units themselves, but will suss out the plugs tomorrow, hopefully this can have a positive update tomorrow I appreciate all the assistance by the way guys Cheers, Tom
