need advice for d15 idle problems

D15, D16, D17 and Mini-Me swaps
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need advice for d15 idle problems

By Norbi_cvc
- Mon Feb 04, 2008 2:37 pm #40808 Hy
I've a '93 eg8 (sedan) civic with d15b2 engine (DPFI, jdm, M/T).
The issue is the following:
when the engine is hot, and i'm driving in stop & go traffic, the idle goes crazy. sometimes the it revs at 2000, then I push a little on the pedal, after it drops to 500, or stops. If I turn on a few electical things like heater fan, headlight, rear window heating idle drops to 500. After i press the pedal it goes up to 1300. Otherwise it runs good, but this thing drives me crazy.
I set the idle speed like the manual says several times but it's still bad.

What I already checked: PCV, EACV, Throttle plate, (air filter, fuel filter are new, oil change in jan. 2008)

What else can I check, replace, clean?

Sorry for my poor english, I'll practice....promise :roll:
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By BAXTER_EJ1
- Mon Feb 04, 2008 2:56 pm #40812 Is your throttle cable sticking? :?
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By hatch_wanna_b
- Mon Feb 04, 2008 2:59 pm #40814 Check the fast idle valve. Sometimes it backs itself out and does that shit to my D15B.

Its behind the little brass plate on the backside of the throttlebody. There are 2 little 8mm screws holding the plate on. Take those out along with the plate.

Then there is a little valve there. A brass valve with a pin in the center of a spring and a white plastic threaded piece. you need to use ur fingers or some tool to screw the whole thing back down inside there all the way.

As long as your idle is already properly set, and your timing is good, this should solve your idle problem!

Let me know if you have any questions!

Give me some good feedback if this works out for you! :thumb:
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By Norbi_cvc
- Mon Feb 04, 2008 3:03 pm #40815
BAXTER_EJ1 wrote:Is your throttle cable sticking? :?


no, it's not sticking. replaced too.
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By Norbi_cvc
- Mon Feb 04, 2008 3:07 pm #40817
hatch_wanna_b wrote:Check the fast idle valve. Sometimes it backs itself out and does that shit to my D15B.

Its behind the little brass plate on the backside of the throttlebody. There are 2 little 8mm screws holding the plate on. Take those out along with the plate.

Then there is a little valve there. A brass valve with a pin in the center of a spring and a white plastic threaded piece. you need to use ur fingers or some tool to screw the whole thing back down inside there all the way.

As long as your idle is already properly set, and your timing is good, this should solve your idle problem!

Let me know if you have any questions!

Give me some good feedback if this works out for you! :thumb:


There's no fast idle valve for D15B2 engine, see pic:
Image
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By Norbi_cvc
- Mon Feb 04, 2008 4:39 pm #40825
teal_dx wrote:I see a fast idle valve in the first pic, look to the right of the EACV


yep, but it says "Except D15B2", and I have a D15B2, so I have to look at the second pic.
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By Norbi_cvc
- Fri Feb 15, 2008 6:51 pm #42449 I cleaned the eacv with wd40.
it seems to be a little better, but the problem is still present... :(
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By Apexracing
- Sat Feb 16, 2008 3:01 am #42491 had this problem on my f22 in my cb7 cleaned and replaced every thing, then i checked the intake and low and behold the gasket was torn badly replaced it and the car ran normal. check for a leak using a spray bottle full of water and a little soap spray onto the intake as it meets the head check for air bubbles. i'd almost bet on it worth a shot any way you look at it.
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