Honda Vtec Posted August 13, 2010 Share Posted August 13, 2010 so i have a 1997 honda prelude vtec its got 240.00 kmson it i just rebulit the motor 5000 kms ago and i am haveing a really bad idle issue now i am not sure what it is at a dead stop on a hot day the car drops idle down to 250 rpms or even lower some times and no matter what i try and set the idle at it will always drop when stopped at alight or when it idles now i have cleaned my EGR valve and it made it better for a day but it still idle a lil ruff and i am trying to figure out what it is so when its cold out side or a night the car idles great no problems and when cold started but other wise its low idle and really shakey the thing is i dont know much about these cars and i really love my prelude but i am going to see it if i cant figure it out and it hasnt thrown any engine codes yet until yesterday it finally did but then it barely ran and i was really far from home so i had to reset the ECU to get home so i couldnt even find out what the code was so some one please help me i need some advice people keep saying sell the car and i just want to fix it any ways thanxs if any one can help Link to comment Share on other sites More sharing options...
Northstar Posted August 17, 2010 Share Posted August 17, 2010 "I have a 1997 Honda Prelude VTEC, with 24000 kms on it. I just rebuilt the motor 5000 kms ago, but now I am having a really bad idle issue. I am not sure why, but at a dead stop on a hot day the idle drops down to 250 rpms or even lower. No matter what I try to set the idle to, it will always drop when stopped at a light or when it idles. I have cleaned my EGR valve and that made it better for a day, but it still idles a little rough. When it is cold outside or at night the car idles great with no problems. It hadn't thrown any engine codes until yesterday. When it finally did, it barely ran. I had to reset the ECU because I was really far from home so I couldn't find out what the code was. Can some one please help me? I need some advice. People keep saying sell the car and I just want to fix it. 1) Use punctuation when posting! PLEASE!!! 2) Don't listen to those "people" anymore. 3) Check the following: - 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) 3) Try adjusting the ICAV screw. 4) Report back with results. Link to comment Share on other sites More sharing options...
prelude98 Posted September 10, 2010 Share Posted September 10, 2010 have you check to ignition module? Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.