Thread: Poo Poo VE-T Idle Issues

So i'm pretty stumped by this. My P10 VE-T doesn't idle correctly. Let's rewind to when i had just put the VE in the car.

I install the VE engine into my P10, without the turbo. Car idled wonderfully. Rock solid at 900rpm's without fail.

At this point, i installed a Z32 MAF, 370cc injectors with a nismo FPR @ 4-bar, with a fuel pressure gauge and update the program on my Calum ECU. Idles and runs fine still.

So i install the turbo onto the car (JUST the turbo, manifold, lines, downpipe) and leave the charge piping off. I lengthened the o2 sensor. I start the car up, with the regular intake tube going to the maf and to a filter, like it was N/A. The car idles like junk. Fluctuating from 1000-2000 rpms, up down, up down. Pretty methodical actually. LOL.

So a few days later, i install the charge pipes and the rest of the turbo setup. Car idles the same, runs like a bat outta hell, but idles like crap.

So at this point, i figure i would install a 300zx o2 sensor, and get rid of the lengthened one. This made the car run a little smoother, but didn't help the idling issue.

So where did it go wrong? Fluctuating idle (worse when it's super cold out), chugging along between 1000-2000rpms, the on/off throttle is horrible. Car is very jerky.

I have checked, via my Calum ECU:

TPS voltage is good
MAF voltage is good
Temp sensor seems to be working fine....
Front o2 has got to be fine, since it's brand new

Throwing codes for:

Rear o2 sensor (not running a cat)
Crank Position Sensor (im running a b13 trans)

Any idea? It pretty much runs great, but this idling is getting to me. At some points when it's really cold out, it will idle at 3,000 rpms....then i'll shut the car off, wait 5 seconds, turn it back on and then it will fluctuate from 1000-2000rpms. It's got to be electrical...but where?

Oh yeah, the car won't go into idle adjustment mode via Conzult, and the idle screw does nothing (used to, doesn't anymore)

just for ****s and giggles...try running it without an air filter. i know it sounds dumb, but i had issues like this with my ve. i checked everything that you did...temp sensor,o2 sensor...etc. for some odd reason i took the filter off and the car ran like a f'in champ. the filter didnt look dirty but when i replaced it, it ran mint. idk...just a suggestion.

Hmm, might be an idea. The filter is a little dirty. I guess it's worth a shot.

Car runs the same with and without an air filter. Although i still need a new air filter. Hehe.

reseat the ecu and try the conzult again. Bin is messed up maybe?

I did try reloading the bin and screwing with the idle rpm's. Didn't work. Thing is pissin me off LOL

can you see the ecu with the conzult? The bin could also be messed up.

Yes it connected fine.

problem started after you lengthened the o2 sensor, possibly related with your soldering. check your o2 voltage readings. ecu disregards o2 sensor at WOT since it's reading from the maps, hence the bat outta hell on heavy throttle. also, at cold start it's probably dumping too much fuel due to the possible bad o2 feedback.

I replaced the o2 sensor already. I didn't have to lengthen this one, because it's a 300zx sensor, and it has a longer wire than stock.