hey guys! just wanted to know if anyone had a quick tip for me im sure its an easy fix but ive tried a few things with no luck so far.
I finally got my 4age 16v 86 up and running since ive been building the motor. BUT it seems to like to idle at 1000 rpm and I think that's just a tad high lol ill give a mod list so you know what ive got going on and if anyof these will work against me with idle speed.
its a 4age 16v big port, cylinders bored to 82mm, forged internals, wiseco high comp pistons, high comp head gasket stock head, 266 cams, weber side draft carbs, msd ignition, hks spark plugs and yea yea you get the deal haha! any help on this. I checked sticky throttle, ive tried retarding the timing a little bit, and ive tried the throttle set screw.
heavilly modified 16v with idle issue
-
- Club4AG Enthusiast
- Posts: 117
- Joined: Wed Jul 15, 2015 1:25 pm
- oldeskewltoy
- Club4AG MASTER
- Posts: 2185
- Joined: Wed Jan 09, 2013 4:44 pm
- Location: Portland, Oregon
Re: heavilly modified 16v with idle issue
1000 rpm with 266 cams, and carbs.... you might get it better... but I doubt it
OST Cyl head porting, - viewtopic.php?f=22&t=300
Building a great engine takes knowing the end... before you begin
Enjoy Life... its the only one you get!
Building a great engine takes knowing the end... before you begin
Enjoy Life... its the only one you get!
-
- Club4AG Enthusiast
- Posts: 117
- Joined: Wed Jul 15, 2015 1:25 pm
Re: heavilly modified 16v with idle issue
well I figured as much but I was just wondering if anyone else has worked with bigger cams and carbs trying to sort out the idle but I think im stuck at a grand hahah
Re: heavilly modified 16v with idle issue
put something over the carb inlets to block them, to see if you have a vacuum leak. Break booster sealed also ?
If the cams are some off brand regrinds, it's anybody's guess how they can idle
If the cams are some off brand regrinds, it's anybody's guess how they can idle
-
- Club4AG Expert
- Posts: 297
- Joined: Thu Aug 15, 2013 4:17 pm
Re: heavilly modified 16v with idle issue
i have Tomei poncams 264 duration... anything below 1000 the car feels like it'll die. As you know, the 4age tends to idle high in stock trim (i.e. 800 or 850) so to say you're at 1000 is not high...
Is your question that you have the throttle screw set all the way down and still can't get it below 1K even if you wanted to? if so, then you most likely have a vacuum leak. But again, don't think you want to get it below 1K (if only by a hair) based on your setup any way.
Just an fyi: my engine is set to idle 900-1K.
Is your question that you have the throttle screw set all the way down and still can't get it below 1K even if you wanted to? if so, then you most likely have a vacuum leak. But again, don't think you want to get it below 1K (if only by a hair) based on your setup any way.
Just an fyi: my engine is set to idle 900-1K.
Re: heavilly modified 16v with idle issue
Are your carbs jetted properly? Gotta tune them puppies! Cams timed properly? Retarded cams don't like low RPM. Get an AFR gauge, not just for fuel injection.
One shot, one kill.
-
- Club4AG Expert
- Posts: 345
- Joined: Thu Jun 20, 2013 4:08 am
Re: heavilly modified 16v with idle issue
I have 260/252 8.5/9.0 cat cams and I have to idle at 1100 otherwise it runs like a bag of ****. If yours is running okay I'd leave it and besides how often is the car idling?!
-
- Club4AG Enthusiast
- Posts: 117
- Joined: Wed Jul 15, 2015 1:25 pm
Re: heavilly modified 16v with idle issue
jinx wrote:put something over the carb inlets to block them, to see if you have a vacuum leak. Break booster sealed also ?
If the cams are some off brand regrinds, it's anybody's guess how they can idle
break booster is gone have manual brakes so no vacuum running from intake anymore but yea ive been looking into it a grand aint bad for the setup im running its my first time building an all out race motor so just nice to have some input from all you guys thanks!
Re: heavilly modified 16v with idle issue
Lol your fine!! Just enjoy the motor, but tune thos jets and get afr gauge like sirduce said so you can keep an eye on what your motor is doing!
-
- Club4AG MASTER
- Posts: 2084
- Joined: Sun Jan 13, 2013 1:18 pm
- Contact:
Re: heavilly modified 16v with idle issue
1000 is great. I see no good reason to want it lower. Even stock is 800. I have always run mine at 1000 because I eliminated a few idle up circuits. Now with my 272s yeah I can get it to idle at 800 but it's very rough and the tip in response off idle is very slow. This is a big part of the reason for increasing the idle. Sure you could get it to idle at 800 but it will be much more responsive and feel and sound better higher. Mine is around 1100-1200 right now and it just feels and sounds better.
-
- Club4AG Pro
- Posts: 653
- Joined: Tue Mar 26, 2013 5:21 am
- Location: Oxford U.K
Re: heavilly modified 16v with idle issue
Tune the cam timing for power and response on a dyno and then let it idle at whatever it likes.
-
- Club4AG Enthusiast
- Posts: 117
- Joined: Wed Jul 15, 2015 1:25 pm
Re: heavilly modified 16v with idle issue
thanks fellas its my first time doing such and extensive engine build and using dual carbs on top of that! so just wanted to hear what you fellas had to say so I do appreciate it now I just gotta find my timing light and then im good to go! @_jacobo_69 is my instagram if anyone wants to take a look at the 86!
Re: heavilly modified 16v with idle issue
I'm completely stock and I have my idle set at 1000, just seems to run smoother that way.