Keeping the EXA except...

EXAsperate · Post by **EXAsperate** » Wed Jul 25, 2007 12:28 pm

Ok Guys, I don't think I will sell my exa to my friend at this stage so its back to the drawing board regarding the surging:

To recap:

Mechanical Mods:
bb T25 turbo (i am told)
Port and polished heads
Blitz BOV
3" exhaust with Zigen cannon
Blitz pod filter
HKS FMIC
Custom Alloy Radiator

Symptoms:
Surges at constant throttle/ almost a misfire as a puff of black smoke leaves the exhaust
High fuel consumption
runs rich
black spark plugs
no problem with missfiring at WOT (Wide open throttle)

So Far:
Replaced spark plugs
Replaced Leads
Changed oil
swapped ECU
swapped AFM
no intake leaks
uses old AFM back to original position utilising log (& cold idle sensor)
Adjusted TPS
Adjustable Fuel Pressure Regulator fitted including guage (all sweet)
Checked Dizzy
Checked coil
Wiggled ECU plugs (does nothing)
Checked Fuel pump

I need more suggestions - or somewhere to recommend taking it (any nissan specialist around melbourne)?

Thanks

Callumgw · Post by **Callumgw** » Wed Jul 25, 2007 2:36 pm

Can you see the fuel pressure gauge while your driving?

When you checked the coil how did you check it? in the dark to see for spark leaks?

Just some thoughts....this is a hard one.....If your up in Melbourne soon I have another ECU you could try. I'll be at teh John Mott for part of one of the days....I could bring it down, let me know.

C

Post by **etking** » Wed Jul 25, 2007 4:15 pm

try the temp sensor .. if not crack the shits with it like i did and put a microtech in...

Post by **tassuperkart** » Wed Jul 25, 2007 6:35 pm

Carefully check the wiring from the water temp sensor to the ECU

With a multimeter you should get as resistance reading of about 2.2 to 2.7 K ohms @ 20 degrees C. Do this at the ECU end of the loom with the temp sensor connected.

If the temp sensor is buggered, the ecu will run in cold start (choke) mode, suck fuel and run shithouse when warm.

L8tr
E

nz_n12turbo · Post by **nz_n12turbo** » Wed Jul 25, 2007 7:54 pm

my sensor was fu*ked and after the car warmed up and u stoped it it wouldnt run again cause it would foul the plugs to much

photoglossy · Post by **photoglossy** » Thu Jul 26, 2007 5:38 am

How long have you had the car? Has it always done this? Possibly a previous owner has replaced the injectors with bigger units without tuning it to suit...

Makes sence of the running rich issue which would effect the drivability (surging)

EXAsperate · Post by **EXAsperate** » Fri Jul 27, 2007 12:42 pm

Thanks for the responses.

If the coolant temp sensor is stuffed why would it missfire even when the car is cold?....it is utilising the 'log' and appropriate sensors....

Tassuperkart - I have taken out the temp sensors and cleaned them accordingly, but i haven't checked the resistance yet...will try that

Callumgw - I have swapped an ECU and found no difference. I did check the coil in the dark but couldn't see any spark leaks.

nz_n12turbo - which sensor fu*ked up on your car? temp sensor or the cold idle sensor?

photoglossy - i have had the car since Feb. It started doing it 3 days after I bought it. i suspected the injectors might be wrong but i can't tell as i don't know what the standard look like (there are three types apparently?)

Thanks guys these suggestions are great. I will look into it asap, but please keep them coming!....I can't even drive this to work! now when i idle it it blows lots of smoke....and flicks black droplets on the concrete.

nz_n12turbo · Post by **nz_n12turbo** » Fri Jul 27, 2007 5:08 pm

mine was the wee senson under the dizzy i thinks its the engine temp sensor if u unplug it the ecu thinkgs tha cars cold all the time ....... not good

lol

Callumgw · Post by **Callumgw** » Fri Jul 27, 2007 6:27 pm

^ ^ ^ that sound promising,
But my thought with te ECU was that maybe the one you swapped to was also stuffed, just a thought.

C

nz_n12turbo · Post by **nz_n12turbo** » Sat Jul 28, 2007 11:46 am

yeah that could be a posibilty to i have about 3 ecus and they all pretty shit and we all know n12s dont have the best ecus

Post by **etking** » Sun Jul 29, 2007 9:40 pm

im guessing water temp sensor, i just changed mind to a vl one i had laying about

EXAsperate · Post by **EXAsperate** » Thu Aug 02, 2007 12:16 pm

so where do you get the temp sensors from? Is a VL temp sensor interchangable with the same temp settings?

Still it wouldn't explain why it does it when its cold though would it?

Post by **The Renegade** » Thu Aug 02, 2007 8:39 pm

G'day dude, good to see you're gonna stick it out and fix her up.

I have 2 suggestions; remove the BOV - if it vents to atmo with the stock ECU it will make the car run rich when it vents, as the air it is releasing has already been metered by the AFM and so therefore there will be fuel for that air (which is now never gonna get to your engine) being squirted into the cylinders. Also, it could be leaking.

The other suggestion - remove the adj FPR. Just to be sure it's not upping the pressure behind the injectors and making it run rich.

EXAsperate · Post by **EXAsperate** » Fri Aug 03, 2007 12:50 am

Thanks Renegade....Time is getting precious atm which is causing more desperation to get her on the road as i really need her with work so busy!

I had the problem without the Adj FPR and when I put it on was ok for a while then came back. i don't believe it really fixed it, it just seems to be a rare intermittent problem. I have removed BOV and had no difference, mind you i have repeatedly checked for leaks.....but nothing.

Post by **The Renegade** » Fri Aug 03, 2007 10:35 pm

Bummer.
Soory mate, I'm all out of ideas........
If I think of anything I'll stick it straight up here.