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93 civic cx cdm
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49 Posts
Discussion Starter #1
ever since i purchased my eh2 (canada), the idle rpm was off spec at not even 200 rpm, sometimes seemed almost 0 rpm. at first it didnt bother me as the engine was running ok. recently i did a water pump change and now the engine keeps sputtering at idle and still really low rpm. not only that but i clearly feel less power being output.

moreover, i performed an idle speed adjustment by unplugging eacv, tightening the idle screw and reseting ecu, but engine still idles at almost 0 rpm. also when i unplugged the eacv and turned engine on, as indicated in honda manual, the engine would die and not idle at a certain tpm as specified in honda manual. this could be a hint of the source problem maybe.

i am pretty sure my timing is off since im getting less power, but what about the sputtering and bad idle speed?

also i checked every spark plug with a timing light and they are ok, however the engine sputters so i could clearly see the timing light was not blinking at a constant rate, it was an off/broken beat.

maybe air filter? but then again why would the idling rpm not change after i tightened the idle screw and reset the ecu? without the eacv plugged the engine would die without pressing on accelerator (on neutral transmission position). weird stuff going on... anyone has an idea?
 

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93 civic cx cdm
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49 Posts
Discussion Starter #3
ok thanks for the info, also i got a new update: i loosened the idle screw and now the engine wont die without the eacv. so my guess is that the idle setting is the culprit (screw was too tight in there). the problem now is that the screw was a pain in the a** to turn and from trying and trying to turn i stripped that b*tch off and now i think i need to remove the TB and use screw extractor. lol what a fkn b*tch that screw is the slot is so soft
 

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Sloppy Jalopy
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1,029 Posts
engines cannot idle at ,( sometimes seemed almost 0 rpm.)and still sound "ok"

if it is low on power after wawa pump change then you probably installled the cam off a tooth .
 

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93 civic cx cdm
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49 Posts
Discussion Starter #5
update: finally after forcing like a bull and stripping the idle adjusting screw, i took off throttle body, this screw is a fkn b*tch for real. here some pics

how should i remove that?
 

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BATSLOMAN GIVES NO FUCKS.
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4,107 Posts
get another throttle body
 

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93 civic cx cdm
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49 Posts
Discussion Starter #7
get another throttle body

thought about that but after drilling, banging and tweaking in out, i finally got that adjusting screw out lol fkn hell that was tough what a b*tch that screw is im lubing the sh*t outta that screw when im putting a new one back in like im greasing it so it unscrews like butter.

here pics of the b*tch all stripped up

anyways im performing another idle adjust tomorrow ill let yall know how it goes

thanks for the support everyone
 

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93 civic cx cdm
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49 Posts
Discussion Starter #9
Oem screw has an oring and lockthread on it so the screw doesnt vibe itself loose or tight.

I still think your timing is off. You didnt touch idle before the waterpump so why touch it after.
i touched idle because it was low even before i replaced the water pump. now i got it to 1.2k rpm at idle because when i took the tb out the tb gasket ripped appart so there is vacuum leak right in the fitv air bypass section of the tb. which is why my idle is high now - too much air getting in throught that ripped tb gasket. i thought of using liquid gasket instead of spending $25 (shipping included) on a new tb gasket, or maybe get one from scrap yard but not sure about swaping in a used tb gasket... what do you think?


as for my timing, yes i know its probably off but before i want to fix the idle and also will change the air filter. the one i have now is from scrap yard lmao
 

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BATSLOMAN GIVES NO FUCKS.
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4,107 Posts
find some gasket maker at your local parts store. comes in sheets
 

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Love the Civic
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1,817 Posts
Or some gasket gel, form a seal or what not, I use it on my water neck to my radiator. Apply a little to both sides, let it get tacky and screw her down. Wouldnt trust a high pressure spot with out a proper gasket there and the sealant as just a corner leak protector......rambling on here sorry.
 

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93 civic cx cdm
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49 Posts
Discussion Starter #12
update: hey guys thank you all for the input it really helps!

Here is what i did the past few days:

-clean TB
-replaced tb gasket
-replaced adjust screw
-tried to adjust idle with steps from manual

after doing so the rpm still low at 500 or so even with adjust screw completely off.

next i took off eacv (iacv) and cleaned it. also cleaned intake ports of eacv/iacv.

still low rpm at 500. my guess is the eacv/iacv is bad. i know it is receiving signal from ecu because when i turn on electrical load such as headlights or heat fan, the engine rpm tries to keep up but cant and goes down a little. then i turn those off and it goes back up a bit. so the eacv/iacv is receiving ecu signal(current) but it seems it cant really open fully.

so my verdict for low idling is bad eacv/iacv

what do you guys think?
 

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Premium Member
2005 Legacy GT
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1,754 Posts
To test IACV. Pull the intake off and let the car idle and get up to temp. Plug TB opening ... does the car die?

Yes - IACV good
No - IACV bad

If IACV good ... next I'd check the FITV. On the underside of the TB. Pull that off and open it up. Sometimes it comes loose and you have to stick a flat head in there and tighten it back down. I know that was the source of some idle issues on my B7 ... mostly hunting for me but may be part of your issue.
 

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93 civic cx cdm
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49 Posts
Discussion Starter #15
update: got another eacv from scrap yard but still same thing so i dont think eacv is culprit afer all....

today replaced pcv valve (old one was done pretty much)

helped a little to get idle rpm up a bit

going to set timing right soon and then completely flush and bleed cooling system as well as engine oil with engine oil flusher (and new oil filter of course)... will possibly clean oil breather chamber... what else can i do? clean fitv valve? seen people suggest this but manual says to not do anything to fitv as it has been adjusted to spec.

anyways i doubt fitv is culprit for low idle as fitv is only there to high rev engine during start but then shuts off after warmed engine. and it is doing this as it is supposed to. my engine at start revs at about 1200 then a min later goes down to 650 now with new pcv, oh and by the way i took the adjust screw off completely now. this is weird that even with the screw fully off it still kinda low 650 rpm... and yes there is vacuum going in through the screw hole... i just not sure why even with it off the idle is low. must be something related to the pcv system. i think there is something clogged between the pcv and breater chamber. i think the connector from breater chamber to pcv hose must be clogged. will clean it after timing engine... anyways, suggestions anyone ?
 

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93 civic cx cdm
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49 Posts
Discussion Starter #17
update: hi guys, i finally got my timing right and fortunately the sputtering stopped! my timing was so off like 35-40 degrees btdc lol... anyways, my idle still low. got new pcv at local parts store... still no go... i checked all vacuum lines seems ok. fitv seems ok. eacv is ok i swapped it with working one... right now im suspecting the oxygen sensor. acceleration is bad on first gear and i recently got a cel code number 1 which is oxygen sensor. i purchased. new one from bosch for $60. ill replace it this week end and let ya'll know how it goes.
 

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93 civic cx cdm
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49 Posts
Discussion Starter #18
update: i replaced the oxygen sensor, i finally replaced it with a Denso and not a Bosch, because i heard Densos are better for jdms... anyways i got the bosch still maybe ill try it out someday. ok so the engine cel never came back with the new denso o2 sensor BUT the f*cking idle still low! wtf! so now im suspecting the fuel filter. because i looked up and a bad acceleration along a low idle could be caused by a clogged fuel filter... my eg is pretty stock and all those things im replacing are oem from 93 lol. even the air filter i replaced and was oem... last step is fuel filter hope it works... got one from FRAM i will maybe replace it tomorrow... oh by the way ive been sea foaming my car the past 2 weeks, did it again today... lots of smoke lol. also changed spark plugs today and did a compression test. 170-180 across all pistons f*ck yeah. now i can only hope that a fuel filter change will get the idle and acceleration right. will send update soon.
 

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93 civic cx cdm
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49 Posts
Discussion Starter #19
update: new fuel filter installed... still low idle - tried adjusting again and no go. i have to keep the adjusting screw completely off for it to idle at decent 600-800 rpm. but sometimes at a stop it will even go down to 500. i took it for a ride and the hesitation when accelerating is still there. now im suspecting my injectors to be bad or clogged. what do you guys think ? this seems to be a never ending problem lol
 

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93 maybe 94 coupe
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289 Posts
When my injectors were bad i got fuel in the oil after shutdown from them leaking, and if i started it within 5-15 minutes itd crank a couple times b4 firing off
 
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