Okay, so my car wasn't running for about a month due to a faulty fuel pump. Finally the car runs again... However, now there's an idle and bog/sputter problem.

The car runs fine when it's first turned on and warming up. Even for a while after it's warmed up. After about 20-30 minutes of being on, the car starts acting up:

When stopped at a light, the idle (at ~750RPMs) becomes twitchy and drops to 500RPMS, sometimes even to a near stall but jumps back up to 750RPMs, and repeats as long as I'm still at the light.

Once that annoyance starts up.. When I drive off it'll bog a bit (or feel less responsive) and then I shift to 2nd gear (around 2-3k RPMS) and as I'm just regularly gasing it, it'll sputter/jerk/bog.

What can cause these two problems?

BTW: When trying to fix my car for the past month, we've tried turning the car on quite a bit of times (and it never turned over), could my catalytic converter be clogged or would this not even be a cause to why I'm experiencing these problems?

Thanks in Advance H-T.

 

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ttt

 

My Civic has done this before and I changed my spark plugs and cleaned my Idle Air Controller Valve (IACV) and the problem went away. I have a b18c swap in my Civic but I'd bet its the IACV.

 

this is a famous topic. i just went through idle hell alos clean iacv and fitv

 

tightened FITV and my last irratic idle disappeared..

However, now, it starts up fine but after about 20 minutes of driving... I approach a stop light, the idle starts to drop to ~500/near stall but manages to get itself back up to ~800 before it struggles to hold idle and drops again, and repeats... Then the light turns green, and when I drive off, my throttle gets a few sputters... This happens into 2nd gear as well.

How do I clean the IACV? I'll go look it up right now, but if anyone can, post it here to please. Thanks.

 

https://honda-tech.com/zerothread?id=1564019 , here you go. The fitv control idle when cold and iacv takes over when warms. However if your car is bucking that is usually a fitv problem.

 

Thanks.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by z6hatchboy &raquo;</TD></TR><TR><TD CLASS="quote">https://honda-tech.com/zerothread?id=1564019 , here you go. The fitv control idle when cold and iacv takes over when warms. However if your car is bucking that is usually a fitv problem. </TD></TR></TABLE>

Done the cleaning of the FITV today, no fix. The car still wants to die out after it's warm and been driven for about 20-30 minutes.

Location (pic preferred) of the IACV and how to clean? thanks.

 

iacv on the back of the manifold. has a black round piece about a little bigger then a roll of quaters and half the length of one

 

Here's the newbest of all newb questions.. I did a little reading...

When I first pulled the FITV out, I pulled the entire Throttle Body, which means I pulled one or two small coolant hoses off... When I was done, I put the coolant hoses back... Now I didn't do any bleeding of the coolant.. Newb Question of the Year: Could this be why?

 

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Coolant bled
FITV Removed and cleaned
IACV removed and cleaned

Idle dropping when car is warm, still happening.

 

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problem still exist and is very annoying.

btw: fuel pump went out before this happened, swapped with a Walbro 255lph on a stock motor... Culprit?

 

Is the fuel filter restricting flow?

 

1, check fuel filter.
2, Do you have an adequete fuel pressure regulator?
3, check dizzy main plug for continuity.
4, check spark plugs and gap them if needed.
5, if no fix its probably the distributor.

 

mine has done this on 3 or 4 ocassions. first time when i bought it tuned idle screw went away, second time was a vacuum leak i found to be at the im, and last was my crank oil seal was bad and the lost pressure caused this.

 

and yes bubbles in your coolant can cause this

 

I had the same problem with my del sol and just ran the car with the radiator cap off for a few cycles and all is good now.