Outer Limits 4x4 Board

Hey all. Wondering if someone can help. It drives well cold temp, when warms up it wont rev above 3000rpm. I fitted 4 inch stainless snorkel. Would this effect if not dyno tuned before i drove or should computer adjust to this fuel/air mixture.

Id be checking your AFM it sounds like its goint into a limp mode.
No need to dyno tune a TB42e, there is nothing that can be done that the computer isnt already doing, anyone that tells you otherwise is ripping you off. They are a pretty basic engine that obey some fairly basic inputs not much can be tweaked exept for slight mixture adj on the AFM and base timing.
I would bet the new snorkel has just highlighted a already failing part. Disconnect the AFM and if it runs no different its knakered.

Mine is doing the pretty much the same!

Easy way to find out is to disconnect the AFM, if I disconnect mine it runs better than when it is connected but wont rev above 3000rpm,

Nissan quoted me a new AFM $900 and is exchange!
They can shove that up their arse!

I have finally found some Used for $250 no exchange 3 month warranty!
I think it is a bargain! Its only taken me three weeks ringing everywhere in AUS

Just got to show it's running so I can sell the Engine combo for the LS2

sorry to hi jack the thread, but my bro in law's tb42e has the same problem, and after its warmed up from driving for a while it gets worse and starts to\ back fire a lot and not rev between gears like its got no power, what should we look at??

we have changed spark plugs to ridium ones, new leads new dizz cap and rotor button and ign coil?? any pointer to what it could be??

mine had a similar problem, ran better with the afm disconnected.

turned out to be the fuelpump.

fuelpump was still working but not producing sufficient fuel pressure to even crack open the fuel pressure regulator.

easiest way to check if its the fuel pump is to remove the return hose at the fuel presure regulator, then turn the key to ignition and see if fuel spurts out.

does anyone know if the TB42S vehicles had an electronic lift pump in the tank?

Is it on LPG and does it do it on both gas and petrol? If it only does it on gas you may need a balance tube between the gas mixer and the snorkel. There is a fair bit of info on it on the patrol4x4 forums.

Sounds like MAF sensor that sits on the airbox

the MAF or AFM sensor is only read after the engine starts to warm up, on cold start the computer goes into a program mode that just increases fuel to the engine and uses the temp sensor, when it gets to a set temp the ECU reads from the MAF, if its dead then it won't rev as the ECU won't know how much air to put in

got ours tuned today, and apparently its the exhaust o2 sensor, will be changing this either tomorrow or day after and will let you's know how it goes if its not that the mob who did it are doing again for free the recon, but they managed to tune it up a little bit aswell,

Mine did this and i thought it was the AFM but ended up being fuel pump.
I replaced standard pump with a walbro from ebay and it fixed it but now its doing it again!!

I hate taking that tank out!!!!

Jimbo wrote:Mine did this and i thought it was the AFM but ended up being fuel pump.
I replaced standard pump with a walbro from ebay and it fixed it but now its doing it again!!

I hate taking that tank out!!!!

i take it you have an aftermarket sub tank like me that runs up the side of the car lol?

Yep!

I took it out to put a new pump in and then last year i blew the high pressure line coming out of the pump right on top of the tank!!!!

we now have the exhaust o2 sensor working properly, but its still a bit doey on 33's, what do ppl recommend to make them run a bit better, we are running 36's for play aswell?? going to possibly put 4.3's in the diff's when we locker it up,
but engine mod wise whats best?? individual coil packs?? what set up?? who is running what??

Bump

Had any replies in regards to your query Apples, as am wondering what can be done beside turbo as well

Brunsy wrote:Id be checking your AFM it sounds like its goint into a limp mode.
No need to dyno tune a TB42e, there is nothing that can be done that the computer isnt already doing, anyone that tells you otherwise is ripping you off. They are a pretty basic engine that obey some fairly basic inputs not much can be tweaked exept for slight mixture adj on the AFM and base timing.
I would bet the new snorkel has just highlighted a already failing part. Disconnect the AFM and if it runs no different its knakered.

not exactly.... if you have the AFM pluged in it will run like shit... when you unplug in it runs rough but better and the AFM voltage gos from 5V farked to .08V so unplug it and if it does change than its fark...

We just bough a new AFM of efi spares got it in and the car is running ok now, no as good as it used to though, has anyone heard of the computer not running properly or would there be somehting else to make them run a bit unusual??? maybe its my imagination?? lol