[Russellc]

I have a 1994 sentra LE with 1.6 engine. I too have had some difficulty with the "advanced timing" instructions given on this site. While the engine seems to run fine, the second i disconnect the TPS plug, the engine will not idle. it will start, but dies, making it impossible to time. I did it without unpluging, noting that it seemed to read correctly on the standard setting. Is this typical for this year? the instuctions on the technical section make reference to 1995 models, and they "assume" it is similar for other models. Anyone else have this problem? According to my manual, all voltages on the plug are correct.

 

[barnoun]

Raise the idle speed if the engine wants to die with the TPS off. There's a big screw on the throttle body(covered by a black plug) that you move when the TPS is disconnected to raise or lower the idle.

 

[Russellc]

Thanks for the reply, but just a couple of questions:
(I haven"t looked at the throttle body yet, but) how does one remove the black plug? Also, once timing is set, will the idle be too high? It seems fine but I have not checked it with a tachometer. Again, thanks for the response


Russellc

 

[barnoun]

Remove the plug with your fingers(it's just pressed in lightly). As for the amount the idle raises, I'd say it goes up maybe a max of 200rpm...

 

[James]

you should first try to clean out the air ways in the tb. more than likely your idle is enough but the holes are restricted. remove your tb and clean it with carb cleaner and try the procedure again, you'd probably get better results.

 

[Smoat]

the easiest way to do this is have someone in the car to start it that is all they will do. Loosen the distributer. Once the car is started pull the tps and have your hand on the throttle. this is the hard part try to keep the engine at idle rpm +-and check the timing and slowly move the distributer to the desired timing. Make sure you rev the engine past 3000 rpm three times this locks in the timing w/ the ecu. then tighten the distributer and that is it. Any other quations about you can ask me. Good luck

 

[James]

ok, that was a good explanation on how to do it but he already did all that, his problem is when you pull the TPS the engine doesn't get enough air to stay idling... I'm sure he knows the rest.

 

[Smoat]

you have to manually keep the throttle open with your hand and check and adjust the timing . This is not an easy task but it can done .

 

[James]

you shouldn't have to. I can diconnect the tps and my engine runs perfectly fine.

 

[Smoat]

on mty se-r and my girlfriends se I had to

 

[James]

that's what I'm saying you need to clean out the tb before you do this. sometimes there's crap in the way that restricts the air so the car dies.

 

[Smoat]

I understand now but when I had my head off the throttle body was cleaned and bead blasted before the timing adjustments, buton my girl friends SE I did not clean so I don't know if there was gunk or not could be I don't know. Just changed the temp gauge sensor today. You can barely see the thing. It was easier w/ the oil filter removed.

 

[Smoat]

just wanted to see if my profile was updated

 

[barnoun]

you have to manually keep the throttle open with your hand and check and adjust the timing . This is not an easy task but it can done .

This shouldn't be done, and here's why: When you give more throttle, the timing advances accordingly(on it's own). Well, if you have the throttle open while you set the timing to 15º, when the car goes back to idle the timing will be less since it was set at a higher rpm. The reason for setting the timing at 15º at idle is so it's advance even more(perfectly normal) as the throttle is opened at a later time(after the initial timing has been set).

 

[Russellc]

Would one still have this problem if you only "hand raise" the idle speed to the correct idle speed while the tps is disconnected? I don't really understand what the tps function is. I just set the timing to just under 15 degrees with the tps connected, detected no detonation ( I was conservative with the advance) and it seems fine, but I hate knowing something isnt done right. I am no expert, but it seems to me that if the idle speed is correct while you are doing the timing, ( by whatever method, be it hand holding the throttle or by removing the plug and resetting it) and if you return it to normal idle speed after every thing is hooked up, you should be ok? sorry to complicate a seemingly simple procedure, hopefully others have had this same confusion, and the answers you guys give will encourage them to tinker with this free horsepower mod.

Thanks all, appreciate all inputs on this!

Russellc