B16A2 Idle problem (intermittent)

[anjin]

Your iavc could be a bit slow reacting, and it overshoots. I was told to spray some light lubricant like wd40 in there after cleaning it to give a bit of lubrication and prevent it sticking etc.

[TbM]

Easy way to test it is swap it out for a working one ie if you know someone with the same sort of car just see if you can borrow theirs to see if it fixes the problem if you cant do that just follow the procedure for testing in the service manual. Ive heard a faulty o2 sensor can cause idle issues as well so might be an idea if you have ruled out everything else to check that out.

Your TPS should be 0.48 volts when your throttle plate is fully closed, id adjust it slightly.

Does the idle problem only happen while applying the brake by any chance?

[beeza]

Are U sure there's no FITV,There isn't a spot to insert an allen key on the end of the IACV is there?

Is the timing correct?

I love these problems Not easy...

My friend (ekcoupe) swapped his timing belt and 70-80% of his problem went but I think his was a number of things.

I agree to swap the 02 sensor anyways.They are important to be working at 100%

[blastnpast]

Subscribed same problems here

[TbM]

^^^ Have you tried using an ek4 ecu yet? swing me a pm with an update if you want and ill see if i got any ideas.

Are U sure there's no FITV,There isn't a spot to insert an allen key on the end of the IACV is there?

Is the timing correct?

I love these problems Not easy...

My friend (ekcoupe) swapped his timing belt and 70-80% of his problem went but I think his was a number of things.

I agree to swap the 02 sensor anyways.They are important to be working at 100%

Beeza i wouldnt be surprised if there is no FITV, from what ive read(workshop manuals and fourms) it appears the fitv's start dissapearing around the mid to late 90's, it seems the performance engines with manual transmissions like the b series are the first that moved onto using the ECT to bump up the idle while the automatics and economy engines like the d series seem to retain the use of an fitv for a while longer.

And definately agree with you on idle issues not being easy lol, too many things effect the idle so it makes it hard to diagnose, especially on the net lol.

[beeza]

Such a good challenge aye.Since I watched that vid on the problem,I cant stop racking my brain but yeah,too many things to check

Timmy reckons his car has no FITV but there's a star key (5 sided) insert on the end of the IACV,and that can be nothing else but a FITV I reckon..

We just haven't looked hard enough to find the key to turn it.We'll,if it was my car,I would have hehehe

I see the SOHC in ya avatar! WOOT WOOT!

[dorikin]

Your iavc could be a bit slow reacting, and it overshoots. I was told to spray some light lubricant like wd40 in there after cleaning it to give a bit of lubrication and prevent it sticking etc.

I think you could be onto something. After watching this youtube clip, he says the IACV is prone to sticking on Hondas so I might take it off again and give it a better clean.

Easy way to test it is swap it out for a working one ie if you know someone with the same sort of car just see if you can borrow theirs to see if it fixes the problem if you cant do that just follow the procedure for testing in the service manual. Ive heard a faulty o2 sensor can cause idle issues as well so might be an idea if you have ruled out everything else to check that out.

Your TPS should be 0.48 volts when your throttle plate is fully closed, id adjust it slightly.

Does the idle problem only happen while applying the brake by any chance?

I'm gunna attack the IACV again, I have a hunch it could be that.

The FSM says TPS should be approx .49V and approx. 4.5V at WOT. How critical is it to get it exactly right.. mine is off by .01V and .1V
The other thing that sucks with my TPS is it can't be adjusted easily, I'm pretty sure you have to hacksaw it off.

Nah, don't need to have my foot on the brakes. I could have the handbrake up and it will still happen.

Are U sure there's no FITV,There isn't a spot to insert an allen key on the end of the IACV is there?

Is the timing correct?

I love these problems Not easy...

My friend (ekcoupe) swapped his timing belt and 70-80% of his problem went but I think his was a number of things.

I agree to swap the 02 sensor anyways.They are important to be working at 100%

Yeh I'm sure. My throttle body looks like this http://www.ff-squad.com/tech/tb/tb.nofitv.jpg
From what I understand OBD2 motors have their fast idle controlled by the ecu http://honda-tech.com/showthread.php?t=1447010

Which puzzles me because I'm running an OBD1 ECU P30 and I don't have any cold idle, fast idle problems..

Not sure if I remember any allen key on my IACV, mine looks like the bottom one here http://www.ff-squad.com/tech/sensors/iacv.jpg

Haven't checked timing (no timing light) but if it's worth checking then I'll get onto it.

O2 sensor replaced with a brand new one about 6 months ago

[beeza]

Kool kool

If that allen key is anywhere,it's where the arrow is pointing but sounds like there isnt one.



Best to get the tps spot on,ya gotta hacksaw the rivets off and replace with screws to adjust.

Not sure if it was asked but is the tb plate sealing properly and the spring on the tb strong as to close the tb firmly.

[dorikin]

I'm pretty sure the TB plate is sealing properly. When I had the intake piping off, I plugged my thumb over the hole in the Throttle Body (that leads to IACV) and the engine stalled.

Would this mean I have a good seal around the TB

[TbM]

Dorikin my TPS was at 0.51 volts at closed throttle and i adjusted it and noticed a difference so would recommend doing it, i had to hacksaw a line in mine and remove it with a flat head but it doesnt take long. I dont think the wot reading is as important as the closed.

If you didnt clean the IACV properly the first time then that could still be causing your idle issues, use subaru upper engine cleaner or if you cant get that bezza knows another cleaner that works well and remember to let it dry before reinstalling it, reset the ecu when your done. Ive never needed to use wd-40 or other lubrcants when i fully clean the IACV, if its sticking its still dirty.

Such a good challenge aye.Since I watched that vid on the problem,I cant stop racking my brain but yeah,too many things to check

Timmy reckons his car has no FITV but there's a star key (5 sided) insert on the end of the IACV,and that can be nothing else but a FITV I reckon..

We just haven't looked hard enough to find the key to turn it.We'll,if it was my car,I would have hehehe

I see the SOHC in ya avatar! WOOT WOOT!

it seems hondas dont like idleing lol, its the engines way of telling you to stay at WOT The star key might be a torx screw, i think they might have 6 sides tho, i had a holden vectra a while back and most of the small screws and bolts had torx heads which is why it comes to mind.

Yep REppin that SOHC D series woot woot lol.

[TbM]

I'm pretty sure the TB plate is sealing properly. When I had the intake piping off, I plugged my thumb over the hole in the Throttle Body (that leads to IACV) and the engine stalled.

Would this mean I have a good seal around the TB

if you did it while it was idle hunting then i would rule out vacuum leaks and throttle body not sealing, if you did it while it was idling normally it could just mean the TB plate was sealing nicely at the point in time but may still be intermittently leaking.

[beeza]

^^ Exactly!

Yes,U seem very cluey mate,excellent stuff.Will be great to put that knowledge into the y4 cause that's what it needs!