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I tried advancing my timing today, and I almost did it, but one thing held me up.
I'm following the SE-R.net directions, and with the car warmed up, TPS connected, idle at 800 rpms, the timing reads right around 14 degrees. Could stand to be advanced I thought.
After shutting the car off and disconnecting the TPS, then restarting the car, the idle jumps to around 1300 rpms. Checking the timing, it reads past the last timing mark at roughly 22 degrees.
What do I do now? The instructions say the idle must be at around 800 rpms with the TPS disconnected. Do I have to adjust the idle down to 800 with TPS disconnected? If so, how? I'm so close, but I don't want to screw anything up.
yes... warm up the car... rev the engine 2-3xs... disconnect tps... and then adjust the idle air screw... located on the passengers side of the intake runners.... adjust down to 750 +/- 50... and then set your timing under no load (aka not when the fans are a blowin)... reconnect let it idle and your done... dont be afraid if it idles a little higher or lower after you reconnect the tps... thats just the ecu doin its job
Uh... you sure you followed the procedure correctly? directly from se-r.net:
Warm up engine to regular operating temp, and ensure idle speed stays below 1000 rpm.
Run engine at 2000 rpm for 2 minutes under no-load [in neutral, no accessories on]. Race engine 2 or 3 times under no-load, then run engine at idle speed. [this heats up the oxygen sensor so it is working]
Turn off engine and disconnect throttle position sensor (TPS) harness connector. [It's on the side of the throttle body facing the firewall - driver side of the engine, down low and past the brake master-cylinder]
Start engine. Race engine (2 - 3000 rpm) under no-load, the run at idle speed. [You may have trouble keeping it running with the throttle sensor disconnected. Depending on where your timing is set, it may stall. If so have someone sit in the car and press the gas *very slightly* to keep it running. Don't rev it up or you will not get an accurate timing reading/adjustment. Keep it at idle speed, about 800 rpm]
Check ignition timing with a timing light. It should be 15 degrees plus or minus 2 degrees Before Top Dead Center. [The timing mark at the extreme left (counter-clockwise) is zero degrees. There are lines at 5, 10 and 20 degrees to the right of it. There is a wide paint mark from 13 to 15 degrees, which the factory probably set yours to. Eyeball 17 degrees between the marks and that's what you want.]
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Khiem
'96 SE-R.... boost, brakes, suspension, etc... sold
'05 Evo
'05 CBR 600RR
what i would do... go drive the car around to warm it up and get on it a bit after it's warm to make sure the O2 is up to temp ( I don't like the idea of just having the car revving in neutral). Shut it off, disconnect TPS, restart car, blip throttle past 4k around 3-5 times, and NOW check the timing.... when you're done, shut off the car and reconnect the TPS.
yeah the guy is not having trouble with the procedure... his idle is just too high to get an accurate reading... so when the tps is dissconnected (after following the timing procedure stuff) all he has to do is lower the idle air screw so he can set his idle so that he can set his timing...
wannase-r... if you have troble finding the idle air screw let me know and maybe i can help direct you to it or try a search and you might come up with a pic... good luck
yeah, i can't get it to idle at 800 with the TPS off. If I adjust the idle with the TPS off, won't this screw up the idle when the TPS is ON?? All driving is done with the TPS on, so wouldn't adjusting idle with it off mess something up?
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1992 Sentra SE-R
Still under 100,000 miles...racking up a whopping 200 a month! Mods: OBX header, ES motor mount inserts, WAI, 19* timing, Brembo rotors and Axxis MM, Clutchnet fiber/fiber clutch
To install: Hyperco Gen 2's
no the fsm procedure is to adjust the idle when the tps is disconnected... when the tps is connect the ecu will raise or lower the base idle to make it 750.... but if the base idle (base idle being the number it idles at when tps is disconnect) is not set right your ecu will be doing a hella too much correcting... trust in the force... set the idle with the tps disconnected... there is no other way
