Surging Idle and Smoke

[Julia]

Hi, I'm new to the board and was just wondering. I just did an aluminum head swap as well as roller rockers on my car that has just lead from one problem to the next. I have almost all of them solved except for my idle. I have set the timing to 14* which it was before i did the mods. However when the spout connector is out it runs great as soon as i put it back in the car runs like crap it surges up and down until it finally dies. The car also smoke when i fire it up, which might be valve seals, although i had them replaced by a mechanic or it might be running just to rich. Any help would be great appreciated. Thanks

P.S. I also have long tube headers, 3.55 gears, under drive pullies, and a ram air intake.

 

[fork5o]

id like to help, but ive been having the same problem too. as soon as i put the spout back in the car runs like crap. no smoke, but the surge is there. i cant figure it out...

 

[drakesdad]

The search button will help........have you checked your TPS to see what it is at........did you clean your MAF ..........could be the small things causing this.............at least it's a start......welcome to :SNSign:
Will

 

[BlackVert]

welcome to :SNSign:

this forum is great, the guys (and girls) on the 94/95 board are the best.

i often have a big cloud of smoke when i start mine up. i am about 90% sure it is due to having an old motor that was driven hard (by the previous owners) and is having blow-by. the excess pressure in the crankcase causes lots of oily vapor to be vented through the pcv and coats the inside of the intake. when the car sits for a while, the oil in the intake settles down near the valves, and when i start it up, the oil gets into the cylinders and i get a big cloud.

re the idle, do you have an aftermarket cam? i'd try backing the timing off a little, maybe 12*?

 

[1slow95]

Try setting the timing to 10* or maybe even 8*. That should help, but I think a custom tune will be required to fix it. Also, is the MAF calibrated for correct size injectors?

 

[fork5o]

man.... theres only one way to find out if theres a cam isnt there i wish i knew what was done to this car.
Ill try changing my timing and post the results

 

[Julia]

Well the car wouldn't run at 10 much less 12 or even lower. I cleaned my MAF today so we will see if that works. The injectors are the stock size so it doesn't have to be recalibrated. Guess i'm just going to have to keep trying one small thing after another!!! Thanks for the advice so far. Ohh and I don't have a cam in the car besides the mods listed in the first post i just installed aluminum heads and 1.7 roller rockers.

 

[fork5o]

if im running without the spout, where do i set my timing?

 

[Julia]

Well just thought I would update this post. I finally got it figured out sort of. It now runs but still smokes but i think i might have that narrowed down to. The surging issued was solved by cleaning the MAF, the IAC, changing the O2's and of all things replacing the O2 sensor fuse. I think it was mostly the fuse that fixed it because the wires used to run over where the exhaust was (i know dumb) and they got wore through and shorted but it now runs smooth as ever. Hope this helps someone!

 

[mikenstang]

The computer on the 94 -95 cars use timing to control idle if there is a rich or lean condition. I would guess that because you just put on alum heads you are getting more air and you may be lean. The adaptive control in the EEC can only adjust the fuel about +/-10% then the timing takes over to try to keep the car running. The timing will swing way up and down sometimes up to 26+* and back down to 16-20* to keep the car running. With the spout out your take out the computer and run the 14* and it stops surging from the timing swings. Without a programmer like the twEEcer there is not much you can do but there are a few things you could try.

first set make sure there are no vaccume leaks!!!!!!!!!
set your timing back to 10* (factory) for now
check your fuel pressure is at 39psi (no vac)
make sure your tps is @ .98vdc

Once all these basics are covered pull your Pos batt cable for about 20-30 min. reconnect and start the car without touching the gas. let it find the idle (don't touch the gas). Once it settles down let it idle for a min or 2 then take it for a ride to see let the computer learn a little.