db17k

I've experienced another cause of rough idle and bogged throttle that is not listed here, or for that fact on any other thread that i could find here.

Actually I just discoved what was causing the issues today. About a month ago i blew a piston ring and had to take my S to the shop. The repair required extracting the engine and taking it apart. A couple weeks later I get her back and the problems start. The second day of driving the rebuilt S the idle was noticably shakey "shuddering". Not just upon start up, but at stop lights even after hours of driving. Another thing i noticed was hicuppy/bogged acceleration through 1st and some of 2nd gear.

I called the shop after about a week and he said it could be the injectors or a bad sensor. NO. after carefully examining the engine compartment and taking notice of a new constant hissing noise at idle, it turns out they never reconnected the air control solenoid sensor. On top of that they miss connected the vacuum hoses to the sensor as well! Here are some pictures to illustrate







By following xviper's CAI Vacuum Line Routing DIY i got corrected.

Due to the fact that the all the hoses and connections had to be taken off and put back together as process of the piston ring repair i was starting from scratch hunting down the culprit.

I couldn't find threads regarding this same issue causing Idle/throttle problems, hope someone finds this helpful.

FRODO

Lot of good info in here i followed something similar to the OP's info to fix my crx after her swap. Turned out the IVAC had to much carbon build up by like he stated it will be more like the car is reving itself. Well atleast in my case.

Vtec12yder

Thanks guys I've been having this problem for a while. I ll give it a try.

hockey_fan59

thanks for this!!

preeeeluuude

Do you guys think this type of problem would be common on an Integra Type-R as well?

rallyrcn

i have the exact same issue as the original post from wisconsin582:
Engine idle dips really low when coming to a stop, and car sort of "shudders" because rpms get down to 300-400 rpm.

When at a stop, after giving a small amount of gas, and then pushing the clutch back in, such as backing out of a parking space, etc, the engine idle dips low and almost stalls. Also, the car has backfired twice when coming off the line while running in this state. The problem is intermittent.

Wisconsin582, have u found the exact cause? Has anyone else had this same exact problem and what was the fix? thanks

Spectre48

Great thread. I've had this happen a few times. I am glad I'm not the only one.

db17k

here's our stalling studdering thread you might want to check out

https://www.s2ki.com/forums/index.ph...&f=22&t=478799

bbhood

THis was happenening when i was driving my 240 and my dad said dont worry about its the computer thinking, he never explains anything. Problem went away and now i understand. Great post.

rdv5434391

- i happen to have an idle that more often than not, does not drop down, settle in, to the normal idle speed...it tends to hang up a few hundred rpm, then drops to normal.......sometimes the throttle lacks that "surgical" response when trying to blip it from idle -- any ideas..

-- i have checked for leakage, since i have a K&N air intake...the filter with tube and box in place of where stock box was

-- it was perfect until installing the K&N, so something from the install is the culprit, just sorry to feel that this will be the price of having the K&N