baonest1

the problem is that when i am driving, and press the clutch in, the revs drop like a normal car would, but mine drop below the idle, then go back to idle. it has cut off once in a while. and its really annoying because you can never tell if it is or not. i just wanted to see if anyone else has this prob.
my idle is around 900rpm, the motor drops to about 100 or so, then jumps back to 900.. sometimes even shuddering like its going to shut off.


does anyone know how i can fix it?

thanx

baonest1

WAFFLES

mine does this aswell. It idles at about 750rpm, then when I pull up to a stop light it will drop to about 500rpm,according to my vafc. It only does it right after I've warmed it up.

SLOW4drINTEG

same exact problem here

i would try to see if ur TPS sensor is putting out the right amount of voltage..i messed with mine once, seemed to be better but no voltmeter to check it...just a thought

dohcter g

Mine is a 11.4:1 CR LS with stage 2 cams and does it also , after I built the motor.

baonest1

yah, im guessing its a cam issue. i am running JUN3s wtih 11.5CR

Rhetoric

iTrader: (3)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by WAFFLES &raquo;</TD></TR><TR><TD CLASS="quote">mine does this aswell. It idles at about 750rpm, then when I pull up to a stop light it will drop to about 500rpm,according to my vafc. It only does it right after I've warmed it up.</TD></TR></TABLE>

Mine does this also after it is warmed up. Sometimes it is a clean shut off; clutch in and the car stalls. It starts up without any problems, however, I have never found out why the car does this and it does get kind of annoying.

So far in this post we have had some probable causes such as cams, tps sensor and compression.

What other variables? Could it be distributor/ignitor failure? Unplugged vacuum hoses?

Lets try to figure this out somehow.

blufke

do you guys have lightened, or lightweight flywheels?

SLOW4drINTEG

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by blufke &raquo;</TD></TR><TR><TD CLASS="quote">do you guys have lightened, or lightweight flywheels?</TD></TR></TABLE>

7.5lbs....i remember someone told me that before about lightweight flywheels..not sure

more info on this pls

Rhetoric

iTrader: (3)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by blufke &raquo;</TD></TR><TR><TD CLASS="quote">do you guys have lightened, or lightweight flywheels?</TD></TR></TABLE>

I have a Act 8.8 lb. flywheel. I too have heard about the idle dropping a bit with lightened flywheels, but then again my friend uses a comptech 6.5lb. flywheel and he does not encounter the idle drop. He has stock internals (head/block; Itr motor).

I can understand the idle would drop 200 rpm, but for it to stall?

baonest1

yah, i have a toda.

SLOW4drINTEG

so its due to high cr motor + lightweight flywheel??

baonest1

i am leaning more towards a lightened flywheel..

BolivianDc2

its the flywheel, revs drop and rise quicker

Rhetoric

iTrader: (3)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Bolivianstrtwpn &raquo;</TD></TR><TR><TD CLASS="quote">its the flywheel, revs drop and rise quicker</TD></TR></TABLE>

Would this also be applied to a lightened crank pulley? I had just a UR pulley on long time ago before my light flywheel and had not noticed any significant rev drops or idle shut downs. I'm thinking it could be the cams or some type of stand alone or piggy back. Not really too sure since it seems to be different for a lot of people.

Say Itr flywheel is roughly 14.5lbs. and Act/Toda 9.5 lbs. Thats 5lb. differential.

So Itr crank pulley 7lbs. and Ctr N1 pulley 2lbs. Thats the same. UR pulley is even lighter than the Ctr one.

Light pulley and flywheel do promote the same purpose right? I hope to tune my car soon, hopefully we can find out if the car still shuts down or significantly drops its revving.

dohcter g

I have an 8.8lb flywheel too.........I am hoping after the car is tuned this problem will stop.

baonest1

brakes or no brakes.. when that clutch goes in, and revs drop, it goes LOWW

WAFFLES

I have a STOCK B16A with a ITR flywheel.

A little update, I disconnected the plug to the EVAP this weekend and it didn't drop once....hopefully that solves the problem. I will clean my IACV this coming weekend too, hopefully that will completely solve it all.

baonest1

hmmm... my car use to surge a lot, and i disconnectd my EVAP line. that fixed the idleing. maybe i should mess around with that. i plugged the line going into the body, (or where ever it looks like its going), but i never really plugged the evap itself..

thanx, ill give it a try.

WAFFLES

I mean I disconnected the wiring plug to the EVAP.

to ease any confusion. BTW, mine still surges at startup only.

SLOW4drINTEG

i still get confused with the EVAP and the IACV.....

WAFFLES

IACV is on the back of the Intake Manifold.

aeolus

my h22 does the same,and im using a aluminum flywheel also,its gets really bad when i have been driving it for a while.i adjusted the idle a little high just to stop it from shutting off.i myself am runnin somewhat around 11.5 or more compression.

SLOW4drINTEG

anybody fix this thing yet?

BrownDx

My brothers car had a terrible idol. I adjusted his IACV and it fixed it. His motor is stock, not sure if it will help you guys.