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94 prelude si idle problem need help!!!!!

 
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Old 10-19-2011, 09:59 AM
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Icon8 94 prelude si idle problem need help!!!!!

i got a 94 prelude si with the jdm f22b motor. it starts fine n everything but when i go drivin around n come to a stop it stalls sometimes cus the idle will bounce between 250-1000 rpms then it wont start for a few minutes. what do u think it is i need to get it fixed drives me crazy
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Old 10-19-2011, 10:26 AM
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Re: 94 prelude si idle problem need help!!!!!

"Poor idle can be caused by a number of things. You should always check foro the cause in this order (order of probable cause):

- Old, worn plugs (replace)
- Old, worn distributor cap/rotor (replace)
- Old, cracked wires (replace)
- Valve adjustment (too tight will lower idle)
- Vacuum leak (check hoses and IM/TB gaskets)
- Air in coolant causing thermal valve to oscillate (properly fill & bleed coolant)
- Funky EGR valve (clean or replace)
- funky EGR port in manifold (clean)
- IACV dirty (clean)
- TB dirty (clean) --> remove MAP sensor first!!!!
- Dirty injectors (should send them to someone like RC to be rebuilt)
- Defective fuel pressure regulator (check for proper fuel pressure)
- Primary 02 Sensor (if fouled it can lower idle speed)
- Bent valves (do a compression test, then leakdown if bad, repair head if valves leak)
- Bad MAP sensor (try giving it a thwack w/a screwdriver handle)

If you have messed with any of these recently, start there first.

The idle adjust screw is the LAST thing you should look at or adjust! The idle speed is controlled by the ECU and set properly at the factory. There are no bolt-on mods that will affect idle speed. Only a valve adjustment, new TB, IM, blower, turbo, or internals should have an effect like this. Fix the root cause and you won't have to dick with the idle adjust screw."
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Old 10-19-2011, 10:32 AM
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Re: 94 prelude si idle problem need help!!!!!

thanks i just found 2 cracked vacuum houses one thats goes to valve cover n other one thats on top of intake bout to change those first n go from there. its like something is trippin my computer cus some times if i unhook my battery to reset it then put it back on it fires right up
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Old 10-19-2011, 10:37 AM
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Re: 94 prelude si idle problem need help!!!!!

No problem man, Vacuume leaks are a PITA Im currently fixing mine today just double check that list ^^. Also possibly Get ahold of a obd1 scanner and see if there is any codes. lettme know from there.
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Old 10-19-2011, 11:28 AM
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Re: 94 prelude si idle problem need help!!!!!

Quote:
Originally Posted by 01LudeFTW View Post
No problem man, Vacuume leaks are a PITA Im currently fixing mine today just double check that list ^^. Also possibly Get ahold of a obd1 scanner and see if there is any codes. lettme know from there.
OBD1 scanner? For our cars? Doesn't exist.
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Old 10-19-2011, 01:33 PM
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Re: 94 prelude si idle problem need help!!!!!

try cleaning the iacv..that messes with idle..very simple just unbolt and spray with break cleaner.i dont know but thats just me..
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Old 10-19-2011, 01:49 PM
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Re: 94 prelude si idle problem need help!!!!!

Ya I shoulda thought about that for honda. There is such a thing for GM vehicles Certain companies (mostly GM) equipped their cars with diagnostic ports before '96 which was the mandated implementatation date of OBD2, but Honda was not one of them. Disregard my last statement, i was in a rush lol
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