ok i have a 99 civic with the 96 b18b1 motor in it. for some time now my car has been doing some weird idleing problems. when i start it it will go up like 3500 rpms and drop down to like 800 and it does this constantly untill it warms up.

 

i would start with the little stuff like check ur plugs and distributor then if thats all good check the code its throwing

 

it does not through or a code anything. i have put 3 new idle air control valves and nothing changed, i messed with the screw that controls the idel and still nothing happend anyone have any ideas to help me out

 

damn dude thats a tuff one ...have u seafoamed it recently... since it runs fine when its warm i dunno i guess it could be a timing problem or maybe even the clutch

 

checked my timing nothing wrong with it, semi-new clutch had it in for over 4000 miles did it a while after i put in the new clutch. anybody know

 

How about the FIT valve? (Does '96 have one?) Got any air bubbles in the cooling circuits that go to the AICV & FITV?

Here's how you adjust base idle on '95, yours is probably the same: Warm up the engine thoroughly, turn off all accessory loads. Unplug the AICV electrical plug & don't let the engine die. Adjust the idle air screw so it idles at about 450 rpm. If you've got an external tach, use it - the one in the cluster might not be too accurate down there. When you plug the IACV back in, it'll bring the idle back up where it should be.

How's your distributor cap & plug wires? If they're beginning to go bad, that usually shows up first when it's cold. They 'get better' as they warm up.

 

my wires are probaly used for about 5000 miles, msd wires. got a new cap when i put the engine in about 7000 miles ago

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JimBlake &raquo;</TD></TR><TR><TD CLASS="quote">How about the FIT valve? (Does '96 have one?) Got any air bubbles in the cooling circuits that go to the AICV & FITV?

Here's how you adjust base idle on '95, yours is probably the same: Warm up the engine thoroughly, turn off all accessory loads. Unplug the AICV electrical plug & don't let the engine die. Adjust the idle air screw so it idles at about 450 rpm. If you've got an external tach, use it - the one in the cluster might not be too accurate down there. When you plug the IACV back in, it'll bring the idle back up where it should be.

How's your distributor cap & plug wires? If they're beginning to go bad, that usually shows up first when it's cold. They 'get better' as they warm up.
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i have bubbles in my radiator any idea what the is from? never low or anything tho.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by kleanlscivic &raquo;</TD></TR><TR><TD CLASS="quote">i have bubbles in my radiator any idea what the is from? never low or anything tho.</TD></TR></TABLE>When I open the radiator cap, I usually have to squeeze the hoses to push air over to the cap. Between that & the bleed screw on the head, it takes some screwin around to get all the air out... But it's important to get as much out as you can.

If you get a constant stream of bubbles coming out when the engine's running, then maybe a leaking headgasket? I believe there's places who can analyze your coolant for combustion gases to settle that one.

 

bump cuz i have same idle problem. Does it only when its warming up, then goes away. Except mine only jumps from 2500 to about 750.

 

what else would be going wrong if my head gasket was leaking?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by kleanlscivic &raquo;</TD></TR><TR><TD CLASS="quote">what else would be going wrong if my head gasket was leaking?</TD></TR></TABLE>Headgaskets don't usually heal themselves. It can only get worse. If it leaks from cylinder to coolant, then one day it'll get bad enough to fill a cylinder with coolant while it's turned off. Then when you try to start the engine...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JimBlake &raquo;</TD></TR><TR><TD CLASS="quote">Headgaskets don't usually heal themselves. It can only get worse. If it leaks from cylinder to coolant, then one day it'll get bad enough to fill a cylinder with coolant while it's turned off. Then when you try to start the engine...
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no i mean like what else would be happending if it was leaking?

 

Often the water will steam-clean the combustion chamber. Take out your spark plugs; look for one that's way too shiny-clean compared to normal.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JimBlake &raquo;</TD></TR><TR><TD CLASS="quote">If you get a constant stream of bubbles coming out when the engine's running, then maybe a leaking headgasket?</TD></TR></TABLE>Do you get a constant stream of bubbles? A bad radiator cap or leaky hose to the coolant reservoir can cause air to get sucked into the radiator. That's not the same as having a constant stream of new bubbles whenever the engine is running.

 

Here check this out, check you throttle ide system, its apart of the TB9B(Bottom Part), it could be broken. The little pin inside could be toasted. I recently had an idel problem and I fixed it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JimBlake &raquo;</TD></TR><TR><TD CLASS="quote">Often the water will steam-clean the combustion chamber. Take out your spark plugs; look for one that's way too shiny-clean compared to normal.

Do you get a constant stream of bubbles? A bad radiator cap or leaky hose to the coolant reservoir can cause air to get sucked into the radiator. That's not the same as having a constant stream of new bubbles whenever the engine is running.
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no it doesnt get bubbles at all anymore i just checked it earlier i let it run for like 10 min and it didnt have anything. all my spark plugs look ok all about the same not one really much better looking than the other

 

about to get off of work bump baby

 

Well, it sounds like it's not your headgasket. If you bleed the system carefully but air pockets keep coming back, check out your radiator cap & the hose to the coolant reservoir. If the hose leaks, it'll suck air instead of sucking coolant back in.

If it only a surging idle, then go back to looking at the AIC & FIT valves (If your car has an FITV). Don't forget to set the base idle properly. If you've cleaned your AICV, then maybe it's just bad & needs to be replaced.