teh_mechanic
17-09-2009, 06:01 PM
Car - Eg, B16 conversion done about two years ago.
Cruising along its all fine, but if you punch it in say 2nd, the revs willl climb from say 2000 to 5000ish (different most times) and then the engine completely cuts out, gives you that dohhhhhhhhhhhhh sound as the revs drop as if you have broken your timing belt or something, then as soon as you let off the throttle and get back onto the throttle its back to fine, since your still rolling and the ignition is still on, so then it then continues along fine, until you punch it again, but even then sometimes it will repeat or sometimes it will pull clean all the way to redline.
Sometimes it does the same cutout just at vtec engagement. like - accelerate, 1/4 second of vtec scream, then cut out.....let off the throttle, back onto throttle its back to fine.
Been happening intermittently now for about a month
Distributor is only about 4 months old... ICM in it is about a year old, coil is as old as engine.
Theories - 1. Wiring isnt the best, so im thinking it could possibly be a wire rubbing as the engine shifts back under load, doesnt really explain why it does it higher in the rev range and even before vtec sometimes though. And you think this would blow one of the fuses.
2. Coil could be dying and cant take it under load, i would of thought this would just result in misfire though, not the engine dying completely but then restarting as soon as you let off the throttle.
3. ICM freaking out? though last time it died the symptoms were high rpm misfiring and tacho needle freaking out.
4. Fuel delivery issue? prob not, would prob only be misfire
5. ECU/Tuning - as it happens, i had a s100 in it, about 1 week ago it got stolen, so now i have an s300 on base map (runs shit with my mods), its due to be tuned next thursday, hence why i want to try and fix this, if im lucky it will fix itself with this new ecu. i was running that s100 tune for about a year though so no reason for it not to of been good for the last month
6. Main relay or fuel relay problem - would of thought this would totally cut the car out and it would not want to start though.
Anyone had a similar problem with a fix? apart from this the car was fine before but i cant get it to do it anymore because the s300 base tune is so bad it misses when idling cold, is rich as obviously, vtec sound comes in but not much power change and it misfires so bad at 6000 it wont go any faster....i only tried that twice, then decided it wasnt a good idea...so i cant really test the problem at the moment
Cruising along its all fine, but if you punch it in say 2nd, the revs willl climb from say 2000 to 5000ish (different most times) and then the engine completely cuts out, gives you that dohhhhhhhhhhhhh sound as the revs drop as if you have broken your timing belt or something, then as soon as you let off the throttle and get back onto the throttle its back to fine, since your still rolling and the ignition is still on, so then it then continues along fine, until you punch it again, but even then sometimes it will repeat or sometimes it will pull clean all the way to redline.
Sometimes it does the same cutout just at vtec engagement. like - accelerate, 1/4 second of vtec scream, then cut out.....let off the throttle, back onto throttle its back to fine.
Been happening intermittently now for about a month
Distributor is only about 4 months old... ICM in it is about a year old, coil is as old as engine.
Theories - 1. Wiring isnt the best, so im thinking it could possibly be a wire rubbing as the engine shifts back under load, doesnt really explain why it does it higher in the rev range and even before vtec sometimes though. And you think this would blow one of the fuses.
2. Coil could be dying and cant take it under load, i would of thought this would just result in misfire though, not the engine dying completely but then restarting as soon as you let off the throttle.
3. ICM freaking out? though last time it died the symptoms were high rpm misfiring and tacho needle freaking out.
4. Fuel delivery issue? prob not, would prob only be misfire
5. ECU/Tuning - as it happens, i had a s100 in it, about 1 week ago it got stolen, so now i have an s300 on base map (runs shit with my mods), its due to be tuned next thursday, hence why i want to try and fix this, if im lucky it will fix itself with this new ecu. i was running that s100 tune for about a year though so no reason for it not to of been good for the last month
6. Main relay or fuel relay problem - would of thought this would totally cut the car out and it would not want to start though.
Anyone had a similar problem with a fix? apart from this the car was fine before but i cant get it to do it anymore because the s300 base tune is so bad it misses when idling cold, is rich as obviously, vtec sound comes in but not much power change and it misfires so bad at 6000 it wont go any faster....i only tried that twice, then decided it wasnt a good idea...so i cant really test the problem at the moment