Nissan Forum banner

1 - 20 of 93 Posts

·
Registered
Joined
·
340 Posts
Discussion Starter #1 (Edited)
Today, I decided to try and check the timing because I am certain it hasn't been checked ever in its 12 year run, until now! Here is a write-up on how to do it. This will make the idleing smoother, engine run smoother, as well as perhaps increase gas mileage for having the optimum timing.

When I checked mine, to my surprise it was at 5 degrees BTDC! No wonder my idle was fluctuating, despite cleaning out the IACV valve, and having new plugs. Not to mention when flooring it, it didn't feel THAT smooth ( I wanted it to feel smoother) and I guess you can say it didn't quite rev easy.

Maximum allowable is 15 degrees BTDC, but you must use 91 or higher octane gas!!!! If you hear pinging or detonation, RETARD THE TIMING to prevent engine damage. According to Nissan Performance Mag in the "Ask Sarah" column of the November 2002 issue, maximum allowable under 87 gas to get slightly more horsepower is 12 degrees.














Be sure to reconnect the TPS and the fan connector once you are finished!

Did I notice a difference? YES! Idle stablized even more, and it runs a lot smoother. I notice myself shifting over 15 mph 1st gear, 25 mph second gear, without thinking as if I do it automatically. Before I would shift at those just because.

Engine doesn't sound strained either. Revs freely as well. I personally believe I have gained some low-end torque. I accelerated faster on a hill on the freeway which I would normally step on the gas and not see a noticeable speed increase. But now I do. Hopefully I can notice some better gas mileage as well (or worse, haha, and not that I didn't have great gas mileage before) :thumbup:
 

·
Registered
Joined
·
235 Posts
Congrats on an *excelent* post. One of the best descriptives i've seen yet.
I was planning to check mine to over break and this took all the guess work out of it.

Thanks again man!
 

·
Registered
Joined
·
185 Posts
Nice post. Did you by any chance spray paint your Valve Cover? Just might want to make sure you use a high temp paint and sealant so it doesnt mess up any internals or electrical.
 

·
Registered
Joined
·
340 Posts
Discussion Starter #5 (Edited)
Thanks for the concern JRinke, but my car runs great. I didn't want to show these pictures because I didn't want to reveal what I've done to the car so far!!! =D But while we are at it...here is a preview so far! Before and after pics:

Before:



After:
 

·
Registered
Joined
·
27 Posts
Great write up, but its also a good idea to check the idle while adjusting the timing as it can be thrown out by the change, I also find it strange that you guys with US GA16DE engines advance by moving the distributor forwards, I do it by moving it backwards?
 

·
Registered
Joined
·
340 Posts
Discussion Starter #8 (Edited)
Thanks guys! Also remember, you cannot set the timing properly IF base idle is messed up! For those people, here is another write-up I did on how to adjust idle. Base idle for manual transmission GA16DE is 650 RPM, 750 RPM for automatic. Make sure idle is correct BEFORE adjusting timing!

1. Warm up and shut off
2. Disconnect fan and TPS
3. Restart and rev 3 times to 3000 rpms
4. Adjust via idle screw, clockwise idle decreases, counterclockwise idle increases
5. Once idle is set, turn off and reconnect TPS and fan



 

·
Registered
Joined
·
185 Posts
Also might want to point out the IACV valve for those of you who are having irratic idle and revving problems. Nostrodamus has an excellent write up on how to clean it up, just pointing out though that its in a different position on this engine than his.
 

·
Registered
Joined
·
106 Posts
GREAT! Post more fix tips for the B13! My engine is 200k over so I'm sure it needs these minor "tunes". Thanks for the tips! Keep em' comin!
 

·
Registered
Joined
·
467 Posts
what is the difference on the b14 for base idle ajustment?
 

·
Registered
Joined
·
467 Posts
you may just want to clean off your pully and needle. its hard to see if you have ac and all of the extras. but it does work i have done it several times.
 

·
Nissan Guru
Joined
·
152 Posts
ive advanced my timing and my idle is right but why do you think my idle doesn't stay up when i turn my ac on. its frustrating, when i stop at a light i now have to put my car in neutral and foot on the gas to keep it from dieing. i have a tach and when i turn it on the needle goes up but it comes back down to where it was before i turn it on. and then fluctuates and then finally dies. its like a 15-20 second process. but i also remember when it worked properly it would go up like 200 rpms and stay there to compensate for the ac being turned on and now it doesn't anymore , any ideas about this?
 

·
Registered
Joined
·
24 Posts
On a carb engine, its prolly the idle up solnoid, not sure if its the same with EFI's.

@Oliver: Great job man!!!
 

·
Registered
Joined
·
106 Posts
zxt said:
On a carb engine, its prolly the idle up solnoid, not sure if its the same with EFI's.

@Oliver: Great job man!!!
The IACV (the thing with the screw on it to adjust idle), also has a solenoid on for fast idle.

SilverSentra: how much did you advance your timing?
 
1 - 20 of 93 Posts
Top