Funny Little Prob On Warm Up

[TAKUSHI]

k well ill try explain this problem best i can

so engine is cold, i get in and drive it, i get maybe 50 meters from my house then under a light throttle, but still enough to increase rpm,

my car starts to spit, cough and lose power, then if you hold the throttle where it is it feels like it drops out all ignition and you can smell raw fuel

but if you put your foot to the floor it sputters some more and really sounds like its struggling then comes back to life and takes off once the rpm is high enough.

now i thought it was my bee r limiter, as it interferes with the signal for ignition from the crank angle sensor, but i took it out and still no difference,

the problem goes away once i get to running temp, ive checked my spark plugs, they're still like new and ive check wiring and plugs but nothing to fault there,

if anyones had this similar prob and has found the answer that'd be great

now i dont want people telling me to check my wastegate, bov or piping as i know without a doubt thats not the problem, its gota be a sensor, just dont wana go replacing

things and not getting anywhere

cheers

[Don Dada]

experienced similar prob on an sr20 turned out to be water temp sensor

[No Crust Racing]

Check your AFM or CAS

[zram]

Same thing happened to me before, and it was the coil pack. As they warmed up the problem happened. Had them changed and no more problem.

[TAKUSHI]

k well i already got splitfires so that rules out coilpacks and coolant temp sensor and afm would control fuel up, when it cuts ignition, rpm doesnt drop it just cuts out all engine noise, so its not the same as flicking the key off but it sounds like the engine has been switched off, thats why its spinnin me out over what it could be

[TAKUSHI]

anyone at all ever experienced what im getting??

its really pissin me off now

[MBS206]

Check your water temp sensor.

If it's f**king out, it can cause major issues like this..

Could also be dodgy knock sensors.

[TAKUSHI]

mmm water temp would only adjust fuel up for cold engine running, but its getting enough fuel

when the engine does its cut out crap it smells of unburnt fuel

but hey im wrong till ive tried i spose

[Don Dada]

does the car start easily when its cold?

It's not a matter of gettin enough fuel its getting TOO MUCH fuel. water temp sensor can cause this.

[TAKUSHI]

starts fine, free revs fine, but you drive it for 20secs then the prob begins, sputter sputter engine loses power sounds like it cuts out but rpm remains stable

then this only lasts for 2 maybe 3mins then once it goes away the car is about half way to operating temp, almost points to a temp sig issue

[TAKUSHI]

ah true, hopefully i dont have to have the car under load to get an incorrect reading

cheers mate

[Don Dada]

Well only one way to find out

Do a search u'll get the resistances that the sensor should be when its hot and cold so u can measure yours with a multimeter and compare

[TAKUSHI]

sweet as mate, haha maybe i should just disconnect the temp sensor altogether and see what she does when i drive it haha

[Don Dada]

just checked the manual

Coolant water temp @ 20*C approx 2.5 k ohms

Coolant water temp @ 80*C approx 0.3 k ohms

Disconnect harness and measure

[toffy]

i had a similar problem with a mates r32 , it ended up being afm . only difference is it would stall after running for about 2 min . also had a water temp sensor go on my ceff , it flooded it till it stalled if you didn't drive fairly hard (hard to do in peak hour traffic) . both of those problems were with an rb20 so this could just be a useless post but sounds like afm to me (rb20 and s1 rb25 share afm)

[SECURITY]

i had the same problem and turned out to be the AFM showing its age. when i switch it to MAP sensor (bypassing AFM) it works fine.

a cheap fix that MIGHT work is to re-solder the pins on the AFM (when you take the square panel off the top of the afm it exposes them) and see if it helps. if it does nothing then try swapping for a known working one then go from there.

[Traditimeour]

i had a similar problem with a mates r32 , it ended up being afm . only difference is it would stall after running for about 2 min . also had a water temp sensor go on my ceff , it flooded it till it stalled if you didn't drive fairly hard (hard to do in peak hour traffic) . both of those problems were with an rb20 so this could just be a useless post but sounds like afm to me (rb20 and s1 rb25 share afm)

I am having this problem on my cefiro. where's the water temp sensor located?

[Adriano]

Its the two pin sensor on the thermostat housing. Have you done a diagnostic check, all but the temp sensor will throw a code, and the sensor itself can be checked quite easily.

[TAKUSHI]

mmm little problem with getting codes, the only wiring that comes off my ecu to my bcm, where a diag plug would be located is for basic sensors so getting a fault code out of it will be a little difficult

[joeyjoejoejuniorshabadoo]

what injectors are you running?

if the latency is not set correctly and they are overfuelling by a milisecind or two then your plugs can be getting fouled on short trips.

go for a long drive and see if this clears it up...