R33 Gtst Running Wierd

[gach2]

Last night as i was driving home from work my r33 began to run wierd

First when i pushed the accelerator nothing would happen and it was very temporary and a second later of pushing harder it would be back to normal. This occured a few times and few of those times i shifted to a gear below and it went fine.

Then later it completely gave up and the engine pretty much turned off (lucky i was on the left lane and put hazards on). Restarted the car and again a few times seemed to struggle to accelerate but ended up going and i drove home with a few temporary loss of power.

This morning i drive into work and no issues at all.

Any ideas?

Was thinking coil packs? but no conisistant misfiring etc

Fuel? My exhuast does have a massive hole in the axleback if thats mucking around with AFR?

[Trex]

afm? I had a very similar thing happen.

[LTHLRB]

your exhaust wont be causing issues with your afr's. Get some CRC contact spray and afm spray. clean your plug and pins for the afm and clean inside the afm with the afm cleaner spray. Give that a shot first before anything

[gach2]

done the afm clean yesterday

this morning car seems fine

but will need to confirm when i go on a longer drive

thanks

[gach2]

have cleaned the afm and did take it on a longer drive

and it did seem to come up once where it felt like i lost power for about 3 seconds

[LTHLRB]

what was the engine temp at? what fuel was being used at the temp? what was the outside air temps?

if its losing power consistently then thats a problem. are you using the stock ecu?

[defari]

Throw in some copper spark plugs

[gach2]

according to the guages

temperature is running between 1/3-1/2

98 caltex fuel

its happened at different temperatures between 5-20 degrees

stock ecu

[Charles89]

I think similar thing happen to me, it was the o2 sensor, because I bought an aftermarket o2 sensor without plug, so I had to join the wires up and I just taped it, and problems occurred. But it seems to be fine once I've soldered the wires.

So maybe check your o2 sensor?

[LTHLRB]

put a pic of your spark plugs up. close up to the electrode

[defari]

im putting three fitty down that that its spark related.

[gach2]

sorry been a while as ive been busy with other things (r33 is barely driven)

Changed the spark plugs over the weekend. Didnt look too bad but prob was best to change them. Coil packs are confirmed to be spitfires and are in good visible condition. Did manage to snap a coilpack clip (still clipped in but will get a new coilpack harness to sort that).

Drove the car after - drove ok for 10 mins, then started spluttering and after a while pretty much lost all power. had to fight with it to and after a while able to run around 2000rpm. Took it back home, but when 2 min before i got home, it started driving normally.

Also the day before i changed the spark plugs i tried starting and it struggled first few times but started after a while.

My belief is fuel (though im barely an expert)

Theres fuel in the tank

Fuel filter was changed at last service (around 1500ks ago)

So if it is fuel my guess is the following

Fuel pump?

Fuel lines?

Fuel tank?

Injectors?

Any idea how to check/test them

or any other ideas on whats causing this?

[LTHLRB]

seems like an intermittent problem, is the earth point from the battery on properly and is the point clean?

is the fuel pump earth hard wired?

if you can get your hands on a fuel pressure tester then having a look at that would be an ace idea. If its spluttering and you have good coils, good plugs n fuel, it may be fuel pump related but its hard to point at that (e-diagnosis)

hows the CAS set? it could be going into Rich n Retard.

Many factors