Problem Diagnostics!

[Mase]

Alright, i am having a few issues with my car and i've tried a few things but still haven't fixed it.

Stats:

rb20det power silvia. rb25 tubo, stock exhaust, hks mushroom pod, malpassi rising rate fuel reg, vl turbo fuel pump, injectors flushed and flow tested spot on last week. EL falcon o2 sensor mated to skyline plug, rb20det wastegate stock boost (around 8psi), afm cleaned regularly.

Problem: when my car is at idle it misses and the revs drop a little. This is intermittent (spelling?). Also, when on the gas peddle and if i back off, then accelerate again sometimes there is a big miss and it's a little hard to start in the morning. Overall, my car doesn't perform as good as what i think it should. Uses about 350 klms to a tank.:headspin:

This problem has been around for a while so i got the injectors flushed and flow tested. They were spot on, i recently put a fuel reg in and set it at 40psi, now the car is a bit easier to start but is still a pain. NB, i didn't remove the stock fuel reg.

Does anybody have any suggestions for this at all?? It's driving me crazy. :blast: Im going to remove the coil packs and give them a clean shortly.

Any ideas, comments and suggestions are greatly appreciated

Thanks

Jayson

[strutto]

Was the fuel pump new? BOV plumbed back? Changed the plugs recently? What plug gap?

[Steve]

have you had the BOV checked out?

[blind_elk]

Have you checked the CAS and the base ignition timing?

Have you checked / cleaned the AAC valve?

[Mase]

cleaned the aac valve yesterday. That's the thing mounted on the back of the manifold right with the cylinder like contraption bolted onto it?

Fuel pump was new about 4 months ago when i did the conversion. Plug gap is about 0.8 i think. bcp6res are the plugs im running im pretty sure. I'll double check the bov for leaks i think.

Thanks people

[strutto]

Yep, thats the AAC valve.

Fuel pump should be fine by the sounds of it...

BCPR6ES should be OK.

0.8mm is a good gap.

Get back to us on the BOV ey?

[Mase]

one thing to note. It idles perfectly when cold, no misses etc, but when i try to take off it misses and surges in power. When it's warm it misses like crazy on idle and doesn't really miss when accelerating.

[Steve]

Perhaps your TPS is playing up. Would be pretty easy to swap with a working one and see.

[yogi000]

I have a stock r32 and i have the same problem. I've done all the same stuff as above but made no difference. Plugs, tune, AAC clean, AFM clean, ecu diagnostics.

I'm stumped....i would love to see what you eventually find cause i've given up.

[Mase]

thanks steve, i will try that today.

[yogi000]

whats the TPS?

[muffas 180]

Throttle position sensor. Try by passing your your rising rate reg. Sounds rich to me.

[kjb_r33]

sounds like an air leak, manifold gasket maybe, seen one the other day on a 32, blew out about 1/2 inch of gasket...

[GTR-Ben]

The problem is intermittent.. so not likely a air leak. Most likely an electrical fault. I have a similar problem in a R32 GTR.

Try the TPS..

[Bl4cK32]

Or change the 02 sensor back to a genuine Nissan one.