Erratic jumping idle on my 94 Civic Si...

[Primer_Drift]

Haha yeah well technically it was the fast idle thermo valve then.. low coolant would result in the FITV staying in full open, and the ECU flipping out because it would read warm but the IACV isn't decreasing the idle.

As for the hesitation, 2 things.. coil and ignitor, or map sensor.. the first being most likely.. there is a third possibility that I won't mention until I see pics of your spark plugs.

[mikey_p]

Thanks guys... I'll be sure to tackle both.. I'll take those pictures of the plugs too.. I know the routine items have been changed like cap/rotor/plugs/wires..

[mikey_p]

Ok so the Jumping Idle came back.. Here is what i did..

-coolant was low so i topped it up and bled the system of air.(seemed to fix the issue at first but car was warm)

Once the car got cold again the jumping idle came back. So then i decided to clean to IACV and TPS. I took off the IACV and cleaned it, let it dry, put it back on.. As well i sprayed carb cleaner in the 2 holes and the bouncing idle went away as long as the spray was squirted into the hole. As soon as i stopped spraying the idle was rough till it cleared up and then started jumping again.. I stuck my hand over the throttle body to make sure of no leaks.. It sucked my hand in hard and tried to die.. NO LEAKS..

I then unhooked the TPS as the idle was jumping and it stopped, idled high at about 1800rpm then down to 800rpm once warm. Plugged the TPS back in and it was fine while it was warm.. Once it cools down it seems to jump.. Does this mean faulty TPS even though the volt test was passed? It was .45 at start and WOT was 4.9..

As well im still getting my sutter or hesitation when engine is warm at about 1000-2000rpm.. After 2000rpm it drives and runs great all the way through to redline..

WHAT ARE MY 2 PROBLEMS? AND HOW DO I FIX THEM?

[mikey_p]

I've been told to check out the o2 sensor as well... Would that have anything to do with this problem?

[=[]BARG[]=]

Is your engine light on?

[mikey_p]

Ok... so the previous owner lied.... Lesson kids... always check it out instead of believing a seller.. (Not saying everyone is a liar but better to be safe..)

Previous owner said in his ad that the plugs/wires/car/rotor were all changed however only the wires were. The plugs had Carbon Tracking all over them. I talked to the previous owner and he said it ran like crap then he changed the wires and it went away a bit but then he decided to sell the car.. Turns out the cap/rotor/plugs were not changed.. To further the stupidity he used Bosch plugs in the civic which says right on the timing cover the NGK plug number to be used.. Not saying there isnt a Bosch plug that may work but really?

I'll throw in the new plugs tonight and keep you updated.. Attached is an image of the plugs... Smart Like Domi!

[mikey_p]

Fixed the hesitation and studder... Was the Plugs..

However the idle still does the same up and down till its warm.. If i unplug the TPS sensor it idles at 2000rpm till its warm then 1000 when its warm... Is this problem my TPS or somethign different?

[=[]BARG[]=]

Did you try cleaning out the IACV yet?

[mikey_p]

Yeah I cleaned the IACV but with no luck.. It was junked up a bit but not too bad..

Will this help?? I was told to Check my FITV (Fast Idle Thermo Valve)

http://www.honda-tech.com/showthread.php?t=1564019&

Is this something i should be looking into.. Im not familiar with this procedure...

[mikey_p]

Ok so here's the conclusion.. thanks for all the help..

-FITV needed to be adjusted/cleaned which fixed the jumping idle issue..

-plugs/wires fixed the hesitation and stutter..

THANKS FOR THE HELP GUYS... RUNS GREAT...

[ryder_23]

Originally posted by mikey_p
Ok so here's the conclusion.. thanks for all the help..

-FITV needed to be adjusted/cleaned which fixed the jumping idle issue..

-plugs/wires fixed the hesitation and stutter..

THANKS FOR THE HELP GUYS... RUNS GREAT...

Great that its working now. But did you not read that I posted that? Should of been the firs thing. Congrats tho.