gotenek

Did a boost leak test. Found nothing.. Checked all vacuum lines and hoses. But I logged my sensor readings using NDSI and it seems that I'm hitting a fuel cut on one of the banks.. What would cause that? A misfiring coilpack? Here is a sample of the readings: Time RPM MAF cool O2 Spd +- Inj Tmng PW Neutral Start TPS 29.291, 3162, 3.19, 75, 121, 36, 13.5, 7.49, 25, Off, Off, Off, Off 29.335, 3212, 3.23, 75, 122, 36, 13.5, 7.77, 25, Off, Off, Off, Off 29.422, 3250, 3.25, 75, 122, 42, 13.5, 7.75, 25, Off, Off, Off, Off 29.509, 3250, 3.27, 75, 123, 42, 13.4, 7.86, 25, Off, Off, Off, Off 29.561, 3325, 3.30, 75, 123, 42, 13.4, 8.02, 25, Off, Off, Off, Off 29.611, 3400, 3.35, 75, 122, 42, 13.5, 8.25, 25, Off, Off, Off, Off 29.644, 3450, 3.42, 75, 122, 42, 13.4, 8.48, 25, Off, Off, Off, Off 29.689, 3488, 3.45, 75, 122, 42, 13.5, 8.67, 25, Off, Off, Off, Off 29.742, 3525, 3.51, 75, 122, 42, 13.5, 8.91, 25, Off, Off, Off, Off 29.790, 3625, 3.56, 75, 122, 42, 13.5, 9.16, 25, Off, Off, Off, Off 29.845, 3650, 3.61, 75, 122, 42, 13.4, 9.42, 25, Off, Off, Off, Off 29.892, 3738, 3.67, 75, 119, 42, 13.4, 9.80, 25, Off, Off, Off, Off 29.973, 3775, 3.71, 75, 119, 42, 13.4, 9.90, 25, Off, Off, Off, Off 30.047, 3788, 3.74, 75, 119, 42, 13.4, 10.18, 25, Off, Off, Off, Off 30.099, 3850, 3.79, 75, 119, 42, 13.4, 10.44, 25, Off, Off, Off, Off 30.166, 3950, 3.83, 75, 119, 50, 13.4, 10.60, 25, Off, Off, Off, Off 30.209, 4000, 3.82, 75, 119, 50, 13.3, 10.50, 25, Off, Off, Off, Off 30.262, 4050, 3.81, 75, 119, 50, 13.4, 10.38, 25, Off, Off, Off, Off 30.304, 4112, 3.81, 75, 119, 50, 13.4, 10.26, 25, Off, Off, Off, Off 30.348, 4175, 3.81, 75, 120, 50, 13.3, 10.27, 25, Off, Off, Off, Off 30.429, 4238, 3.84, 75, 117, 50, 13.4, 10.32, 25, Off, Off, Off, Off 30.510, 4238, 3.84, 75, 117, 50, 13.4, 10.32, 25, Off, Off, Off, Off 30.523, 4375, 3.90, 75, 119, 50, 13.4, 10.62, 25, Off, Off, Off, Off 30.676, 4388, 3.92, 75, 119, 50, 13.3, 10.75, 25, Off, Off, Off, Off 30.773, 4475, 3.94, 75, 120, 50, 13.4, 10.84, 25, Off, Off, Off, Off 30.836, 4538, 3.96, 75, 119, 50, 13.4, 10.86, 25, Off, Off, Off, Off 30.971, 4562, 3.97, 75, 118, 50, 13.3, 10.89, 25, Off, Off, Off, Off 31.046, 4600, 4.01, 75, 119, 50, 13.4, 11.08, 25, Off, Off, Off, Off 31.121, 4388, 42.06, 117, 4, 216, 6.7, 0.00, 110, Off, On, On, On 31.178, 4800, 4.07, 75, 119, 60, 13.4, 11.48, 26, Off, Off, Off, Off 31.285, 4888, 4.11, 75, 118, 60, 13.4, 11.64, 26, Off, Off, On, On 31.375, 4975, 4.14, 75, 119, 60, 13.4, 11.74, 26, Off, Off, Off, Off 31.437, 5050, 4.20, 75, 119, 60, 13.4, 12.10, 25, Off, Off, Off, Off 31.485, 5138, 4.23, 75, 119, 52, 16.6, 0.00, 110, On, On, Off, On 31.522, 5350, 4.31, 75, 117, 60, 13.3, 12.54, 23, Off, Off, Off, Off 31.563, 5350, 4.32, 75, 117, 70, 13.4, 12.52, 110, Off, Off, On, On 31.605, 5412, 4.32, 75, 115, 70, 13.3, 12.39, 23, Off, Off, Off, Off 31.648, 5450, 4.32, 75, 116, 70, 13.2, 12.21, 23, Off, Off, Off, Off 31.687, 5612, 4.38, 75, 117, 70, 13.3, 12.69, 23, Off, Off, Off, Off 31.731, 369562, 149.93, 116, 5, 38, 7.0, 0.00, 110, Off, On, On, On 31.774, 5550, 4.41, 75, 109, 70, 12.6, 12.95, 21, Off, Off, Off, Off 31.841, 5638, 4.41, 75, 90, 264, 0.0, 2.55, 95, Off, On, On, Off 31.942, 5725, 4.28, 155, 166, 10, 1.0, 225.28, 110, Off, Off, On, On 32.018, 5750, 4.45, 75, 117, 70, 13.2, 12.94, 22, Off, Off, On, On 32.056, 5775, 4.46, 75, 116, 70, 13.2, 12.90, 22, Off, Off, Off, Off 32.099, 5838, 4.47, 75, 117, 70, 13.3, 12.73, 22, Off, Off, Off, Off 32.152, 5712, 4.09, 75, 118, 70, 13.4, 3.24, 26, Off, Off, Off, Off 32.198, 5562, 3.43, 75, 117, 80, 13.5, 0.81, 31, Off, Off, Off, On 32.252, 5475, 3.08, 75, 121, 80, 13.6, 0.80, 27, Off, Off, Off, On 32.296, 5362, 1.97, 75, 119, 80, 13.6, 0.80, 25, Off, Off, Off, On 32.346, 5212, 2.67, 75, 114, 80, 13.6, 0.80, 25, Off, Off, Off, On 32.399, 5150, 3.14, 75, 114, 80, 13.6, 0.80, 25, Off, Off, Off, On 32.445, 5050, 2.95, 75, 111, 80, 13.7, 0.79, 25, Off, Off, Off, On 32.498, 5012, 2.31, 75, 111, 80, 13.7, 0.79, 25, Off, Off, Off, On 32.565, 4875, 1.69, 75, 109, 80, 13.5, 0.81, 25, Off, Off, Off, On 32.638, 4725, 1.72, 75, 111, 80, 13.7, 0.79, 25, Off, Off, Off, On 32.701, 4650, 1.62, 75, 116, 80, 13.7, 1.81, 25, Off, Off, Off, Off 32.753, 4562, 1.90, 75, 119, 80, 13.5, 2.15, 30, Off, Off, Off, Off 32.790, 4425, 2.55, 75, 118, 80, 13.6, 3.92, 40, Off, Off, Off, Off 32.842, 4350, 3.05, 75, 121, 80, 13.4, 5.12, 110, Off, On, On, On 32.897, 4050, 115.10, 119, 3, 66, 6.7, 0.00, 110, Off, On, On, On 32.954, 3950, 3.37, 75, 117, 80, 13.0, 8.63, 26, Off, Off, Off, Off 33.006, 4025, 3.43, 75, 119, 80, 13.4, 8.58, 26, Off, Off, Off, Off 33.060, 4000, 3.49, 75, 123, 80, 13.5, 9.05, 26, Off, Off, Off, Off 33.128, 4050, 3.59, 75, 124, 80, 13.4, 9.70, 25, Off, Off, Off, Off 33.206, 4062, 3.64, 75, 124, 80, 13.5, 10.11, 25, Off, Off, Off, Off 33.250, 4050, 3.66, 75, 123, 80, 13.4, 10.10, 25, Off, Off, Off, Off 33.317, 4062, 3.70, 75, 120, 80, 13.4, 10.20, 25, Off, Off, Off, Off 33.393, 4100, 3.79, 75, 118, 80, 13.4, 10.74, 25, Off, Off, Off, Off 33.455, 4112, 3.86, 75, 119, 80, 13.3, 11.41, 25, Off, Off, Off, Off 33.493, 4150, 3.89, 75, 119, 80, 13.4, 11.76, 25, Off, Off, Off, Off 33.537, 4175, 3.91, 75, 119, 80, 13.4, 11.82, 25, Off, Off, Off, Off 33.591, 4212, 3.95, 75, 119, 80, 13.4, 12.18, 25, Off, Off, Off, Off 33.644, 4212, 3.94, 75, 118, 86, 13.3, 11.77, 24, Off, Off, Off, Off 33.688, 4262, 3.90, 75, 118, 86, 13.2, 11.46, 25, Off, Off, Off, Off 33.736, 4288, 3.91, 75, 118, 86, 13.3, 11.55, 25, Off, Off, Off, Off 33.800, 4325, 3.92, 75, 118, 86, 13.4, 11.34, 25, Off, Off, Off, Off 33.878, 4288, 3.90, 75, 112, 86, 12.8, 11.49, 25, Off, Off, Off, Off 33.935, 4325, 3.89, 75, 117, 86, 13.4, 11.24, 25, Off, Off, Off, Off 33.969, 4425, 3.92, 75, 118, 86, 13.2, 11.28, 25, Off, Off, Off, Off 34.046, 4638, 3.96, 75, 117, 86, 13.3, 11.25, 25, Off, Off, Off, Off 34.132, 4388, 3.97, 75, 118, 86, 13.4, 11.69, 25, Off, Off, Off, Off 34.198, 4500, 3.96, 75, 113, 86, 12.8, 11.15, 25, Off, Off, On, On 34.240, 4438, 3.96, 75, 113, 86, 13.2, 11.44, 25, Off, Off, Off, Off 34.318, 4488, 3.95, 75, 117, 86, 13.4, 11.22, 25, Off, Off, Off, Off 34.401, 4512, 3.96, 75, 118, 94, 13.3, 11.35, 25, Off, Off, Off, Off 34.457, 4512, 3.98, 75, 118, 94, 13.4, 11.38, 25, Off, Off, Off, Off 34.503, 4550, 4.00, 75, 119, 94, 13.4, 11.46, 25, Off, Off, Off, Off 34.555, 4600, 3.99, 75, 119, 94, 13.4, 11.36, 25, Off, Off, Off, Off 34.630, 4600, 3.97, 75, 118, 94, 13.4, 11.06, 25, Off, Off, Off, Off 34.696, 4600, 4.01, 75, 118, 94, 13.4, 11.49, 26, Off, Off, Off, Off 34.738, 4650, 4.00, 75, 118, 94, 13.3, 11.42, 26, Off, Off, Off, Off 34.790, 4712, 4.04, 75, 119, 94, 13.2, 11.58, 26, Off, Off, Off, Off 34.873, 4712, 4.03, 75, 119, 94, 13.4, 11.42, 26, Off, Off, Off, Off 34.960, 4750, 4.05, 75, 119, 94, 13.4, 11.50, 26, Off, Off, Off, Off 35.006, 4775, 4.03, 75, 118, 94, 13.3, 11.31, 26, Off, Off, Off, Off 35.041, 4775, 4.09, 75, 119, 32, 0.0, 0.00, -145, On, Off, Off, On 35.108, 4850, 4.09, 75, 118, 100, 13.3, 11.61, 26, Off, Off, Off, Off 35.186, 4825, 4.05, 75, 118, 100, 13.3, 11.19, 26, Off, Off, Off, Off 35.256, 4912, 4.10, 75, 118, 100, 13.2, 11.60, 26, Off, Off, Off, Off 35.291, 4888, 4.11, 75, 118, 100, 13.3, 11.83, 26, Off, Off, Off, Off 35.323, 4938, 4.11, 75, 118, 100, 13.1, 11.78, 26, Off, Off, Off, Off 35.368, 4975, 4.15, 75, 117, 100, 13.3, 10.24, 110, Off, On, On, On 35.445, 5125, 4.05, 110, 85, 0, 0.0, 0.00, -145, On, Off, On, On 35.548, 5012, 4.21, 75, 117, 100, 13.3, 12.09, 24, Off, Off, Off, Off 35.624, 5012, 4.21, 75, 117, 100, 13.3, 12.09, 24, Off, Off, Off, Off 35.637, 5088, 4.15, 75, 117, 100, 13.3, 11.61, 25, Off, Off, Off, Off 35.703, 5100, 4.19, 75, 118, 100, 13.3, 11.95, 24, Off, Off, Off, Off 35.815, 5150, 4.24, 75, 118, 108, 13.3, 12.27, 24, Off, Off, Off, Off 35.900, 3600, 278.59, -46, 179, 172, 0.0, 0.00, 110, On, On, Off, Off 35.934, 5188, 4.20, 75, 117, 108, 13.3, 11.67, 25, Off, Off, Off, Off 35.982, 5100, 4.24, 75, 118, 108, 0.0, 0.00, -129, On, Off, On, On 36.059, 5212, 4.24, 75, 116, 108, 13.3, 11.83, 25, Off, Off, Off, Off 36.159, 5250, 4.26, 75, 117, 108, 13.4, 12.28, 24, Off, Off, Off, Off 36.210, 5288, 4.26, 75, 117, 108, 13.3, 12.17, 24, Off, Off, Off, Off 36.252, 5288, 4.30, 75, 117, 108, 13.3, 12.45, 24, Off, Off, Off, Off 36.309, 5288, 4.30, 75, 117, 108, 13.3, 12.39, 24, Off, Off, Off, Off 36.396, 5300, 4.28, 75, 117, 108, 13.3, 12.17, 23, Off, Off, Off, Off 36.466, 5350, 4.27, 75, 116, 108, 13.4, 11.98, 24, Off, Off, Off, Off 36.501, 5375, 4.33, 75, 116, 112, 13.1, 12.70, 23, Off, Off, Off, Off 36.535, 5400, 4.30, 75, 117, 112, 13.3, 12.25, 23, Off, Off, Off, Off 36.589, 5412, 4.32, 75, 117, 112, 13.3, 12.39, 24, Off, Off, Off, Off 36.637, 5462, 4.36, 75, 117, 112, 13.2, 12.76, 23, Off, Off, Off, Off 36.691, 584400, 273.47, -45, 1, 176, 0.0, 0.00, 110, On, On, Off, Off 36.768, 5500, 4.37, 75, 118, 112, 13.2, 13.00, 22, Off, Off, Off, Off 36.867, 5512, 4.37, 75, 115, 112, 13.3, 12.93, 22, Off, Off, On, On 36.928, 5550, 4.38, 75, 118, 112, 13.2, 13.02, 21, Off, Off, Off, Off 36.975, 5475, 4.30, 75, 118, 112, 13.3, 9.83, 20, Off, Off, Off, Off 37.057, 5300, 3.45, 75, 117, 112, 13.4, 0.82, 35, Off, Off, Off, On 37.135, 5300, 2.92, 75, 115, 112, 12.6, 0.89, 29, Off, Off, Off, On 37.181, 5150, 1.71, 75, 116, 112, 13.6, 0.80, 25, Off, Off, Off, On 37.223, 5025, 2.94, 75, 115, 120, 13.5, 0.81, 25, Off, Off, Off, On 37.275, 4875, 2.58, 75, 112, 120, 13.6, 0.80, 25, Off, Off, Off, On 37.348, 4800, 1.92, 75, 111, 120, 13.6, 0.80, 25, Off, Off, Off, On 37.406, 4700, 1.68, 75, 109, 120, 13.6, 0.80, 25, Off, Off, Off, On 37.454, 4612, 1.71, 75, 112, 120, 13.6, 0.80, 25, Off, Off, Off, On

What exactly exactly was your issue?

I've gapped the spark plugs again to 1.1mm recently and no change.. And yes, they are bcpR7es NGK 6282 (typo haha). The rpms start breaking up anything above 4000 rpm. The higher the load, the worse the misfire really.

Put a scope on the negative of all the cylinders. #6 seems to be dropping below 5v. I'm not sure of what to derive from this. Checked resistance from signal wire to ecu for all cylinders and they are all at 0.182 ohms. Checked ground for Coilpacks. Resistance was nominal. Checked CAS signal wires (2) as well and they are a 0.145 which seems nominal.. I thinkSwapped ECU from a friend's good running gtr. No change.. lol Cylinder 6: Rest of the cylinders:

Well, I unplugged both o2 sensors. Still have the misfires. Also tried gapping the plugs to 0.6mm ( i know, its ridiculous) but still have the misfires.

Used one from a friend's properly running car. I've checked wiring. Didnt see any voltage drop

Oh i see i will try that as Hadouken suggested as well. I have new o2 sensors coming in 2 days. Just wanted some input on my current ones

Don't run what? Are you suggesting that my o2 sensors are okay?

No unfortunately not.. its been there since a long time preventing me from driving the car

I will try unplugging them thank you. I converted to r34 gtr coilpacks so ignitor pack was deleted. Yes eveything was from good running friend's car Yes. Compresion test yielded even 160 psi on all cylinders while engine was hot. Boroscope each cylinder. Valves and cylinders looked ok. Just a little bit of oil around the piston rings but thats understandable at 155,000 km.

R32 GTR misfire. O2 sensor readings. Hey everyone, hoping I can get some insight into this.. I've chasing this misfire since months. Engine boggs heavily when cold until coolant temp reaches 60 degrees celcius. Clears up as soon as it hits that mark. Engine misfires heavily under high load above 4000 rpm. 10 psi boost. Engine is bone stock. Stock ECU. Work done so far: -New coilpacks and harness. -Spark plugs BCP7ES gapped to 0.8mm -Fuel pressure and injectors ok. New fuel filter. 12.4 volts at fuel pump. -Smoke tested- found air leak and replaced all 7 intake gaskets and all hoses underneath. Smoke tested again - no air leaks now. -Swapped CAS. no change -Swapped MAFs. no change. -swapped boost solenoid. no change -swapped coolant temp sensor. no change. -Base and ignition timing is on point. Now i'm looking at o2 sensor readings. They don't seem normal to me but I would just like to confirm with anyone with more diagnostic experience than me. Here is the data from ECUTalk via consult. Idle after hitting closed loop: 0:00 - 0:25 Shy revs: 0:25 - 0:30 Idle : 0:30 - 1:00 Hold rpm 1300: 1:00 Please. I will appreciate any input. Thanks!

Thanks guys. After many confirmations, online and IRL, i know for certain that the timing belt is super loose. I will be pulling the engine in a week to change the oil pump, timing belt, tensioner, idler, spring, intake and exhaust gaskets, aac gasket. Will definitely update on how it goes as everything is unfolded in the engine. Thanks again everyone!

I am very worried as well which is why I try to research as much as possible before I do any further diagnosis or find out how to do this diagnosis. I pulled the coolant line in front of the timing cover and it dripped a bit. Nothing to worry about lol.

Took the timing belt cover off. There were no rubbing marks on the timing cover. Intake cam gear was grinding with the vack cover and the exhaust cam gear slightly grinding as well. Timing belt a little tight. I'm not sure how tight its supposed to be. Found some rubbing marks on the inside teeth of the timing belt for 1 inch. Is the ok for the timing belt to move back and forth? Any comments on the grinding? What can be told about those rubbing mark on the teeth? http://s27.postimg.org/k7t1lauwz/20150928_154209.jpg Video showing the timing belt play and cam gear grinding : https://www.youtube.com/watch?v=GclZnyZXrFI

I put the CAS back in the same position. Marked everything before taking it off. Yes, I believe the timing belt was a little too tight. But what would cause the knocking noise?