idles rough when coming to a stop
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Joined: May 2006
Posts: 18,398
From: Wisconsin
Yeah, exhaust leaks. Some background for that...
The O2 sensor actually measures the DIFFERENCE in oxygen from inside vs. outside the exhaust pipe. If you have an exhaust leak, blowing onto the OUTSIDE of the sensor, that'll throw off the measurement.
The O2 sensor actually measures the DIFFERENCE in oxygen from inside vs. outside the exhaust pipe. If you have an exhaust leak, blowing onto the OUTSIDE of the sensor, that'll throw off the measurement.
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Just got mine back today for the same reason! Ignition coils aren't often checked, but warm stalls, (highway/rolling, or stopping) is often result of this. Get that checked. or check it yourself if you know how!
Thread Starter
Joined: Sep 2009
Posts: 14
For 1990, there's also an air boost valve #9 that can allow excess air into the intake manifold. I never had a Honda with that component, so I don't know what to do with it, other than clean it??
I actually looked back for where you said your coil was cracked. You're talking about user "crack3d", right? Or does YOUR coil have cracks? Cracked coil can produce flaky spark, and it can cause this. You can check by starting the engine in complete darkness & watching for arcing. This works best when the engine is completely cold before you start.
Idle RPM hunting up & down (but not misfiring) would make me suspect IACV, FITV, boost valve, etc. - components in the idle control system.
Misfiring (caused by coil or wires etc) is a sharper drop in RPM, & it sounds different in the exhaust. Sorta hard to describe in words.
I actually looked back for where you said your coil was cracked. You're talking about user "crack3d", right? Or does YOUR coil have cracks? Cracked coil can produce flaky spark, and it can cause this. You can check by starting the engine in complete darkness & watching for arcing. This works best when the engine is completely cold before you start.
Idle RPM hunting up & down (but not misfiring) would make me suspect IACV, FITV, boost valve, etc. - components in the idle control system.
Misfiring (caused by coil or wires etc) is a sharper drop in RPM, & it sounds different in the exhaust. Sorta hard to describe in words.
yes i was quoting CRACK3D about the ingition coil hopefully when i buy it this weekend thatll fix the problem. but there are some other things that happening when coming to a stop car starts to shake i think i might need to resurface the rotors and squeaking from the rear passenger side tire everytime i hit a bump think its the bushings thank you guys so much for you guyss help
Thread Starter
Joined: Sep 2009
Posts: 14
hopefully this weekend ill find out thanks
Thread Starter
Joined: Sep 2009
Posts: 14
how will i know if there is an exaust leak i know it sounds deeper and wierd but i got a flowmaster in my car so everything sounds deeper
Junior Member
Joined: Sep 2009
Posts: 48
From: north carolina
listen by the headers for a kinda spitting sound or feel around them for air. also u can smell exhaust more than another car.go to auto zone have them tell u wut ur check eng code is reading, its free, itll say fuel too lean. u could try seafoam its at any autoparts store for 8 bucks itll burn out all the bad **** in ur engine it smokes out thru ur exhaust ull c where its cuming from. ull get back sum lost hp from over the years i did mine huge difference 270 000 mi still strong
Thread Starter
Joined: Sep 2009
Posts: 14
yep its 1990 they only read it from 95 or 96 and up i jump it with a paper clip correct
Thread Starter
Joined: Sep 2009
Posts: 14
well guys its not the ignition coil just changed it with a brand new one and a new rotor (had to break the old one off it was stuck badly) and its still idle rough but not as bad i can hardly feel the car shake but looking at the rpms it drops past 600 then jumps back where its supposed to idle at
next is exaust leaks if i was to buy the seafoam will it smoke out where the leak is comeing from and can i just pour it in with my regular motor oil with no problem
next is exaust leaks if i was to buy the seafoam will it smoke out where the leak is comeing from and can i just pour it in with my regular motor oil with no problem