1. Home
  2. Nissan Autos
  3. Bad Timing

Bad Timing

i got one of those Blazt Consult Cables yesterday and I've been logging all the sensors on my car.

The most alarming bit, is that the timing seems to be busy bouncing around at idle going anywhere from between 17 and 3 BTDC.

While, and I must test this again, revving the engine creates a nice steady ignition timing. Within reason.

MAF Looks fine, the O2 Sensor looks like it's switching fine, the duty cycle looks good, I presume the injector time is OK.

Its an SR20De, in a 94 Nissan Primera (UK), Automatic, 130k on clock... Any thoughts? The timing doesn't seem to correlate with anything else frankly.

Time RPM Air Flow Water Temp C O2 Sensor Speed mph Battery Throttle Injector Timing AAC A/F Base Duty Cycle

29.292 1062 1.68 84 130 0 14.5 0.48 2.75 15 27 101 2.43 29.343 1062 1.68 84 129 0 14.5 0.48 2.77 15 27 101 2.45 29.383 1062 1.68 84 130 0 14.5 0.48 2.77 5 27 101 2.45 29.433 1038 1.68 84 130 0 14.5 0.48 2.77 3 27 101 2.4 29.473 975 1.68 84 129 0 14.5 0.48 2.79 3 27 101 2.27 29.523 950 1.68 84 129 0 14.5 0.48 2.83 3 26 101 2.24 29.573 912 1.69 84 129 0 14.5 0.48 3.01 7 26 101 2.29 29.613 862 1.68 84 128 0 14.5 0.48 3.09 11 26 101 2.22 29.663 850 1.67 84 127 0 14.5 0.48 3.17 15 26 101 2.25 29.703 850 1.68 84 127 0 14.5 0.48 3.21 15 26 101 2.27 29.753 850 1.67 84 58 0 14.5 0.48 3.33 13 26 99 2.36 29.793 862 1.66 84 110 0 14.5 0.48 3.27 15 26 97 2.35 29.843 850 1.67 84 110 0 14.5 0.48 3.29 15 26 97 2.33 29.883 875 1.67 84 86 0 14.5 0.48 3.29 11 26 97 2.4 29.933 888 1.66 84 122 0 14.5 0.48 3.29 13 26 97 2.43 29.973 900 1.66 84 122 0 14.5 0.48 3.27 11 26 97 2.45 30.024 862 1.66 84 124 0 14.5 0.48 3.25 9 26 97 2.33 30.064 875 1.66 84 127 0 14.5 0.5 3.25 13 26 97 2.37 30.124 888 1.66 84 127 0 14.5 0.48 3.25 13 26 97 2.4 30.164 900 1.64 84 129 0 14.5 0.48 3.21 9 26 97 2.41 30.214 925 1.66 84 130 0 14.5 0.48 3.19 9 26 97 2.46 30.254 900 1.66 84 130 0 14.5 0.48 3.19 7 25 97 2.39 30.304 888 1.66 84 130 0 14.5 0.48 3.17 9 25 97 2.35

37.875 2325 2.03 84 122 0 14.6 0.78 2.7 41 27 99 5.23

37.925 2312 2.05 84 125 0 14.6 0.78 2.74 41 27 99 5.28 37.965 2312 2.04 84 124 0 14.6 0.78 2.75 42 27 99 5.3 38.015 2312 2.05 84 110 0 14.5 0.78 2.75 41 27 99 5.3 38.055 2325 2.05 84 43 0 14.6 0.78 2.77 42 27 99 5.37 38.105 2312 2.05 84 24 0 14.6 0.78 2.9 42 27 99 5.59 38.145 2325 2.05 84 11 0 14.5 0.78 2.9 42 27 99 5.62 38.195 2325 2.04 84 8 0 14.6 0.78 2.9 42 27 99 5.62 38.245 2350 2.05 84 15 0 14.5 0.78 2.9 42 27 99 5.68 38.295 2338 2.02 84 71 0 14.5 0.78 2.79 42 27 99 5.44 38.335 2338 2.03 84 100 0 14.5 0.78 2.75 41 27 99 5.36 38.386 2338 2.02 84 121 0 14.5 0.78 2.68 41 27 99 5.22 38.426 2350 2.04 84 127 0 14.5 0.78 2.67 41 27 99 5.23 38.476 2338 2.05 84 128 0 14.5 0.78 2.72 41 27 99 5.3 38.516 2350 2.05 84 127 0 14.5 0.78 2.74 41 27 99 5.37 38.566 2338 2.03 84 123 0 14.5 0.78 2.73 42 27 99 5.32 38.606 2338 2.03 84 54 0 14.6 0.78 2.8 41 27 99 5.46 38.646 2338 2.03 84 19 0 14.6 0.78 2.78 41 27 99 5.42 38.696 2312 2.02 84 11 0 14.6 0.78 2.78 41 27 99 5.36 38.736 2338 2.04 84 9 0 14.5 0.78 2.79 41 27 99 5.44

Ta Simon

Reply to
Simon Dean
Loading thread data ...

I think the wildy adjusting timing during idle may be OK. Here's why:

On my Sentra with the GA16DE motor, the proper procedure to test/adjust the timing I have to:

Warm up the car to normal operating temps. Dis-connect the throttle position sensor Dis-connect the fans Rev the car to 3000 rpms twice set the idle screw so that I have a steady idle at 750 rpms (650 for manaul tranny)

Once all that is done, THEN I can check or adjust the timing with a timing light. I checked the timing once without having done any of the steps above and found it jumping all over the place.

Cars used to be so much simpler. But hey, with sophistication comes more power and fuel economy for the same displacement.

CD

Reply to
Codifus

Hi There,

Wanted to check what was happening with mine before I responded.

OK, I have a consult port thingy with consult cable, so I don't think I need to disconnect the TPS and all that malarky. I just have a "Base Idle Adjust" button and hey presto.

But what happens, the Timing stays smooth at fifteen (I havent checked with a Timing Light though - that's what Consult is telling me).

But the RPM's are thrashing around all over the place. Very lumpy RPM's.

Any thoughts?

Simon

Reply to
Simon Dean

The Consult is GOD:) I would take its word over any manual timing methods any day. The consult probably has the ability to compensate for all the other factors affecting timing in a nissan motor, such variable cam/valve timing etc. Today's cars are COMPLICATED. Only a computer can really keep up.

I actually wnet in and re-adjusted my timing today. It was a nightmare. I tried to push it up to 15 degrees so I could run 92 octane. Every time I got close to 15 degrees, the cars idle would jump and the timing marks would go way out of wack. I settled on a best guess of 15 degrees and went for a test drive. Awful. Actually lost power. So I wnet back and set it back to base values, 8 +- 2 degrees. Car feels better now. Have to let my tank of 93 octane run out and put back 87 octane. I should get my power back.

CD

Reply to
Codifus

Timing at idle is meant to jump around. The ECU doesnt just use the idle speed control valve to regulate idle speed as in times of old, timing control is far more accurate..

Tim..

Reply to
Tim..

MotorsForum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.