***THE FINAL IDLE THREAD***

[venom369]

If you think about how the nissan ecu works... There are 4 major sensors that affect timing, tps,cts,maf, knock. All these play a role nissans way of giving a "tp" value and within that value gives fuel duty cycle and ign timing. There "theoretical pulsewidth" also includes a guess of how much load is on the engine and since timing doesn't move much, maybe thats a clue to what's going on. You have a wideband or anything to monitor what your engine is doing?

Whats up man, Yes i have one of those aem x wifi widebands, but my driod 2 wont connect to it. so i need an itouch to access it. so at the moment I cant check my afr's

But the maf and the tps are both new.

the knock sensor, I did the resister mod

and the tps "seems" like its in working order. nothing to question it, no stuck values or anything like that so idk what can be going on.

[venom369]

Just set the timing with the tps plugged in, and its now at around 16*

The engine is still having the power loss problem.

Idle is crystal clear, but once I hit 0+ on the vac gauge the engine looses all power.

it does makes boost (on the gauge) and i hear the turbo spool like normal, but theres no boost, its the exact opposite, it feels like the car is pulling a semi, thats how held back the power/feel is.

[compactfean]

You done a boost leak test? Maybe bov leaking or something?

[venom369]

You done a boost leak test? Maybe bov leaking or something?

havent done a boost leak test, The vac is at 19 and the boost builds up to 9 psi (which i have it set at).

I have driven a ka-t before with the turbo manifold hanging on by the last threads, and I couldent build ANY boost whatso ever.

BUT, that ka-t in that condition still ran better than this.

New spark plugs, gaped at 30, I checked the ignition coils for cracks and there are none.

U think the ignitor chip could be going bad? I have a fuel filter on the way as we speak aswell.

[compactfean]

No, if the ignitor chip was out, it rather wouldn't start or it would misfire. Talking about fuel filters......got me thinking about fuel pressure...what's it at? Also does your car have a converter? If so how does it drive with it unbolted?

[venom369]

No, if the ignitor chip was out, it rather wouldn't start or it would misfire. Talking about fuel filters......got me thinking about fuel pressure...what's it at? Also does your car have a converter? If so how does it drive with it unbolted?

Alright, So I went back into timing mode again and re timed the engine. When I plugged the tps back in the timing changed from what I had it set at.

So, I timed the car with the tps plugged in... and that changed it.

Results: The car only "acts normal" when the timing is advanced around 23+, anything lower than that and the boost feels like its being held back by the engine.

Im running 93 octane But i know having the engine advanced that much is farr from good.

[compactfean]

Lets see here, knock sensor is bypassed. Tps is set corectly, does it gradually go up to 4.xx volts as you slowly open the throttle? Mafs is new and obviously fixed some issues so id say is good. O2 sensor is not used on wot runs so that is out. Cts is new? I thought you said you replaced it anyways. The only thing I can think of is engine timing or cas is off a tooth. Cts. Fuel pressure. Exhaust backpressure (clogged cat) how are your vitals? Fuel pressure, compression, etc?

[venom369]

Yes the tps raises to 4.8 at wot
Its set at .44v

-New maf
-New Coolent temp sensor
-1 ohm Knock sensor mod

I just raised the physical timing to where the engine idle sounded like it should. not too rapid, not too slow.

boosts fine now, has all its power.

I need a consult to read the ecu timing, but the engine in now running flawless, perfect cold starts and no bogging,no hesitation what to ever.

Finally the sr is an SR =]

[compactfean]

Good job man....now that I think of it....where did you put the pickup for the timing light? Ive heard that some people get wierd readings at different places.

[venom369]

Good job man....now that I think of it....where did you put the pickup for the timing light? Ive heard that some people get wierd readings at different places.

I used the loop on the back that runs off the 4th cyl spark. I know some people get different readings but I can't seem how, they put that loop on for a reason. The designers of the sr knew what they were doing....unless of course that loop has a totally different purpose lol. But yeah running perfect, boosting perfect, and ecu flashes 55. =)

[TheRealNap0le0n]

lol funny story... i have a N/A ka and i was just randomly reading your thread thinkin man im lucky i dont have these issues....

sooo two days ago my car starts breaking up on acceleration... and then later that night just full on miss fires with a code 34... great.

so i did the resistor trick but it only helped a little... swapped coil and ignitor... nothing. sheesh thats what i get for cursing my self lol.

i gotta buy a DVOM mine got stolen, so i can check TPS and MAFS, lucky for me i have a hatch and a vert in the back of my garage to swap parts from...

[venom369]

Alright, im bringing my old thread back from the dead.

SO,..I never really entirely figured out what was wrong with this timing/boost issue and after noticing my engine starting to misfiring at idle (once every 10 seconds or so) I have returned here.

I will explain this as simple as I can:

-TPS is set to .45v
-Engine ecu was throwing a knock sensor code #34
- I did the 1 ohm resister trick, and it worked. No codes accept for #55 (which means there is no "bad"codes =]
- When I set the timing to 17 degrees the engine acts perfect UNTIL I make any sort of boost... at that point there is no power from the boost. (gauge reads 9psi)
- Only when the timing is advanced to around 23 and higher the boost is in full effect like normal.
-BUT, this is bad for the engine lol.
My questions is why, any ideas are welcome

[strongrsthood]

My 93 went from sohc a/t
To dohc m/t 13psi
You two are the most helpful thread on nico or shopkey
Thanks
Got a 99gtp 3.8 supercharged I want to shove it in a 96gtp coup car....thoughts