Sr dilemma Please offer advice

[SrS13]

First off I've been having problems with setting the timing on my Sr20. I follow this procedure: let car warm up, drop rpms to 7500, unplug the TPS, then adjust timing using CAS. The problem is that after I set my timing and plug the TPS back in the timing jumps a couple of notches back or forth every time. What am I doing wrong? or what if something is wrong?

Also, My stock temperature gauge sensor has begun to opperate in a strange manner. It is surging constlantly. It will mark C when I floor it and when I am at idle it marks normal. I switched my sensors from my KA onto my SR so I know its not that. Would I just have air in my system?

I also noticed my top radiator hose gets hotter than my lower hose.

Please Help I desperately need technecal advice.THANKS :help :help

[loudbay]

i just used a timing gun with the sensor plugged into the cas and the car idling at the most decent idle i could get it..... thats why you have six wire on the end of the ignition sub harness and the corresponding engine harness plug only has 5 wires.... it's an extra 1st cylinder signal wire... that's also why i've seen the extra wire sticking out of many sr harnesses (kind of out of the back/firewall area of the ignition subharness).... i'm not sure if they come like this new, but i bet they do....

[loudbay]

sorry i forgot the other ?s you can bleed your coolant system with the coolant system bleeder valve on the water neck(upper/not thermostat). and all i can say is that the stock gauge is really worth more doing a fun little dance than it is as an accurate engine monitoring device.... you could even buy the 10 dollar gauge at autozone and be better off.....

[Supafly]

as far as the radiator thing goes, the pump pulls the fluid from the bottom of the radiator, which is where the cooler water/coolant should be. the heated coolant comes out at the top and flows down the core to the bottom to be picked up by the pump.

[s13sr20chris]

ign timing should constantly be changing with tps plugged in. that shows that the ecm is controlling it. it actually uses ign timing to control idle along with the iacv/aac.

[candela]

Quote »ign timing should constantly be changing with tps plugged in. that shows that the ecm is controlling it. it actually uses ign timing to control idle along with the iacv/aac.[/quote]

exactly....once its set it will jump all over when teh TPS is plugged back in, but you are good to go.

You know my buddy had that same problem. We tried to solve it for a while and ended up giving up. Do you have a system? high gain? Anyhow...just go get a nice water temp gauge w/sensor and stick that bad dawg in the rad hose and enjoy!

[SrS13]

So then the ignition timing jumping either back or forth is normal after I plug the TPS back in? Strange, never knew that before, but I learned something new today thanks guys.

[SrS13]

When I plug the TPS back in after I set my timing to 15 degrees the timing jumps and it never reads 15 degrees again?? Are you guys sure this is normal???? Im very confused can someone explain how that works?

thanks

[s13sr20chris]

yeah, im a nissan dealer tech. the 15 is just your base timing. there are other factors the ecm uses to modify real timing like a gazillion times a second or something. i promise.

[SrS13]

so then it is never suppose to read 15 after the TPS is plugged back in? because if I unplug it it reads 15 then I plug it and it reads something completely different.

Thanks for the help.

[s13sr20chris]

it may, under certain conditions still read 15. only when the ecm determines there are no factors worthy of changing it. 90% of the time you will plug it in and the ecm will start changing it right then and there. i think you have it just right.

[SrS13]

Ok, so inm summary:

My timing is normal. I unplug the TPS to set base timing then when I replug it it will jump around because of certain factors.

My gauge is normallly retarded as well. Its remedy is to buy an aftermarket.

And it is normal for the bottom radiator hose to be hotter than the top.

Is this all correct?

thanks once again for those who helped

[loudbay]

the top radiator hose should be hotter... the one going into the thermostat should be the coolest water....

[s13sr20chris]

the timing is right. i cant remember which hose should be hotter.

[NY S13 SR]

Timing should not jump much around after it is set. I've done it a million times and it should be right on 15 when you are done. If it is jumping around above 16 or below 14 something may be wrong.

BTW the loop on the back of the engine for timing sucks. Use the 1st cyl with a wire between the coil pack and the plug, that will set it right with no possibility of error.

_________________Jeff HHeavy Throttle