idle surge ((fixed))

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idle surge ((fixed))

Postby Pr377yRicky » March 3rd, 2013, 9:38 pm

alright my idle is surging 1.5k to 2k rpms after warm up. I have taken off the EICV and the Fast Idle Valve and hit them with Carb cleaner. The surging stop for about 10mins after the engine warms up; then starts surging again. Need ideas of what to do.
also should I hit with carb cleaner multiple times, if so how many?
P.S. I have also bled the coolant to make sure there wasn't any air in it.
P.P.S. I warmed the engine, then unplugged the EICV, there was no change in the surge. So, I'm thinking that I should remove it, then carb clean it a few more times before buying another one.

(( Head Gasket and Intake Manifold Gasket Failed.)) :roll:
Last edited by Pr377yRicky on January 8th, 2014, 4:59 am, edited 1 time in total.
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Re: idle surge

Postby Biscuit » March 4th, 2013, 10:06 am

Did you reset the ECU?
If not, reset the ECU, top off the coolant, and drive the car.

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Re: idle surge

Postby Pr377yRicky » March 5th, 2013, 12:31 am

yes I did that, every time I did anything to the car.
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Re: idle surge

Postby Biscuit » March 5th, 2013, 10:18 am

Remove the Throttle Body and inspect the gasket for leaks. Also check the vacuum hoses attached to the TB for cracks/leaks and all of the vacuum hoses attached to the Intake Manifold. The Hoses on the charcoal canister should also be inspected.

Nathan
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Re: idle surge

Postby d16a3teg » March 5th, 2013, 11:54 am

did you remove the fast idle valve internals? If yes did you then reseat the threaded part back to the bottom of its range ie twist it till it was all the way down? Found that this was needed to be done on a couple of the cars I've had to get the fast idle to reset to factory - the wax thingy had rotated up out of place a little bit.
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Re: idle surge

Postby Pr377yRicky » March 6th, 2013, 2:51 am

I didn't find any vacuum leaks in the hoses.
next I'll check the gasket next.
any opinions on the Fast idle valve,twisting the wax stopper? the SFM says not to touch it but hey i'd like more info on this, so i'm know what i'm doing before I fuck up my only car.
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Re: idle surge

Postby Biscuit » March 6th, 2013, 10:23 am

That fast idle valve is another vacuum leak source. Turn it in 180* and see what happens.
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Re: idle surge

Postby d16a3teg » March 6th, 2013, 10:54 am

The one on a B16a that i'm currently playing with took about 4 complete 360 to get to seat again and the surge problem has gone; I also removed this wax stopper on my neighbours car (94 Prelude) and cleaned out the fast idle valve body and then reseated to the bottom of the range - problem of inconsistent surging was gone. Also seemed to help with the cold warm up rpm which had moved up to about 2500 rpm now its back down around 1600 rpm.
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Re: idle surge

Postby Pr377yRicky » March 6th, 2013, 9:14 pm

alright i'll try it today, will be back with an update :)
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Re: idle surge

Postby EhBrah » March 7th, 2013, 12:18 pm

A tricky one to find but another cause of this is the diaphragm on top of the charcoal canister.
Locate the vacuum line that runs to it.
Warm up the car and get it to start surging.
Disconnect the vacuum line from the end connected to the solenoid on the firewall.
Plug the port/nipple on the solenoid (you should feel/hear a vacuum) with your finger.

If the surging stops then you probably have a blown diaphragm on the canister.

I have the same problem, just haven't gotten around to fixing it since I stored it 12 years ago.
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Re: idle surge

Postby MinkelR » March 8th, 2013, 8:42 am

^+1
The top of the diaphragm just pops off.
Mine was torn in two spots a few years ago:
Image

You can replace it with one from a Legend. They're the same diameter and thicker.
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Re: idle surge

Postby Pr377yRicky » March 9th, 2013, 9:17 pm

alright I will try this.
update I screwed the wax thing on the FICV up and down a few times didn't make a difference.
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Re: idle surge

Postby EhBrah » March 11th, 2013, 9:10 am

MinkelR wrote:^+1
The top of the diaphragm just pops off.
Mine was torn in two spots a few years ago:
Image

You can replace it with one from a Legend. They're the same diameter and thicker.


if this isn't in the FAQ section it should be and also include which gen/model Legend you sourced the diaphragm from or part number would be good too. Nice to include the picture and image from the manual.
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Re: idle surge

Postby Pr377yRicky » March 12th, 2013, 12:53 am

been uber busy at work, still looking into the diaphragm thing when I get time
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Re: idle surge

Postby Pr377yRicky » June 8th, 2013, 8:08 pm

FOUND THE PROBLEM...( O.0)
Intake manifold gasket is blown....
never saw the problem till today, next time I look at it better instead of glossing over it. /wrist!!!!!!!!!!
anyways back to it...
to change that gasket do I need to remove the head and intake manifold together??? cuz it does seem possible to reach the nuts underneath or the manifold bracket.
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Re: idle surge

Postby d16a3teg » June 12th, 2013, 1:10 pm

You can remove the inlet manifold without removing the head. There is a manifold bracket which supports it underneath and has two 12mm bolts that hold on to the inlet manifold. Then there are the upper and lower nuts - it is sometimes easier to remove the fuel rail to give better clearance from the top. From underneath the support bracket might need to be removed to give enough room to pull those ones off.
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Re: idle surge

Postby EhBrah » June 12th, 2013, 10:41 pm

First thing that should have been done was to spray around possible leak areas with carb cleaner or my preference is starting fluid. You would have seen an immediate change in rpm as soon as the spray hit the vacuum leak. Oh well, lesson learned. Yes just remove the manifold, no head removal needed. Good luck.
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Re: idle surge

Postby MinkelR » December 13th, 2013, 9:35 pm

Biscuit wrote:That fast idle valve is another vacuum leak source. Turn it in 180* and see what happens.

Where'd you get the tool to do that? It's a 5 sided allen key. I need to fix my idle surge and can't find this tool.
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Re: idle surge

Postby d16a3teg » December 26th, 2013, 9:35 pm

I used a large flat blade screwdriver in the slots on either side to move it
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