WTF is happening!!!!!!!!!
06-24-02, 01:09 PM
#1
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WTF is happening!!!!!!!!!
okay, I have a huge problem that i need help with from someone experienced please!
I have a 86 GXL, compression is good. This is what happens
driving in 1st gear, slowly rev to 4000 rpm or so, slowly though, (like the pedal is barely pushed) and then I punch it, take the revs up to around 7500( done this a few times and rpm peak hold at the highest was like 7661), shift to second, drop the clutch and punch it again.
As soon as i punch it in second the car ***** out on me, their is huge flames and backfiring coming out the pipes,(true dual, right side is front rotor, and left is rear rotor) the rpms drop drasticallly like the car is going to stall, let off the gas, and slowly get back on it and it is fine, the car runs perfect otherwise. It has done this since changing my exhaust system and removed the air pump. The 6ports are wired open. tps is adjusted correctly. I have an S-afc but this was happening before installing it, and fuel adjustments haven't helped.
this is an annoying problem because the first time this happened when i was racing an integra gsr with a crowd of over 200 people. i raped it off the line shifted to second gear, and then it happened, i looked like a fool that blew his engine or something, but it works fine otherwise. what the hell is going on, i have checked with local shops, dealerships etc, the only thing someone ever told me is that the ecu wil cut fuel on the back rotor at 7800 rpm, but i am not going that high, i know this because of peak hold on the tach, plus it has dne it below 7000 rpm as well.
i need this to stop happening, it is embarrasing and also very sad when your baby doesn't run right.
I have a 86 GXL, compression is good. This is what happens
driving in 1st gear, slowly rev to 4000 rpm or so, slowly though, (like the pedal is barely pushed) and then I punch it, take the revs up to around 7500( done this a few times and rpm peak hold at the highest was like 7661), shift to second, drop the clutch and punch it again.
As soon as i punch it in second the car ***** out on me, their is huge flames and backfiring coming out the pipes,(true dual, right side is front rotor, and left is rear rotor) the rpms drop drasticallly like the car is going to stall, let off the gas, and slowly get back on it and it is fine, the car runs perfect otherwise. It has done this since changing my exhaust system and removed the air pump. The 6ports are wired open. tps is adjusted correctly. I have an S-afc but this was happening before installing it, and fuel adjustments haven't helped.
this is an annoying problem because the first time this happened when i was racing an integra gsr with a crowd of over 200 people. i raped it off the line shifted to second gear, and then it happened, i looked like a fool that blew his engine or something, but it works fine otherwise. what the hell is going on, i have checked with local shops, dealerships etc, the only thing someone ever told me is that the ecu wil cut fuel on the back rotor at 7800 rpm, but i am not going that high, i know this because of peak hold on the tach, plus it has dne it below 7000 rpm as well.
i need this to stop happening, it is embarrasing and also very sad when your baby doesn't run right.
06-24-02, 02:13 PM
#5
Check your AFM. If it is full of sticky ****, it can get stuck all the way open, and when you shift into second, the motor is basically flooding its self. The lower RPM's can't handle the fuel, and you get some big 'ol flames and backfiring. Test the AFM and clean it up, be careful though, they're fragile. Did you plug the hole in the airbox that the air pump tube left?
Nick
Nick
06-24-02, 02:18 PM
#6
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the airbox is gone, the hoses are plugged. its not flaming at low rpms, up at 7000+ it shootingflames. the inside the the afm is clean, the flapper door moves fine, but it is tilted down at the front slightly, but this would make it close easier wouldn't it?
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06-24-02, 03:15 PM
#8
It's when you shift into second and hit the throttle right? so you're at about 4500-5000 rpm when it's flaming? or it it before you shift into second, when you're at 7000 that it's doing it? Check your crank angle sensor, and make sure that when you rev the engine, the timing advance, and then returns to normal after you rev it.
06-24-02, 11:34 PM
#14
Nothing to see here.
Check your TPS with a DMM and make sure it doesn't go out of range when going to WOT. If not TPS may want to try grounds as you say that it's fine if you accelerate slowly to 4k rpm in first. What happens when you punch it in first and what happens when ou slowly accelerate through the gears? Is it bogging down at around 4k rpm? If so, it may be the 3800rpm hestitation. Lots of different theories and fixes on that.
B
B
06-25-02, 09:27 AM
#16
The best tool you can buy is a factory shop manual, or if you aren't rich, a haynes manual. Both have a proceedure to check the Crank Angle Sensor. As for the timing, get a timing light, and shine it on the timing marks on the pulley with the engine running. (WATCH OUT FOR THR FAN!) rev the engine, and watch the marks. It should advance as you rev it engine, and return to the top when you let off the gas.
Nick
Nick
06-25-02, 10:45 AM
#17
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you got a nack for pointing out the obvious in my posts ted 
your leaving the forum? or that's what i got from the "i got warned thread"
any way have you checked the tps? it will take you 2 seconds it's only in second gear or when it happens you just don't keep going to third? and you already tuned the s-afc on a dyno right? or by someone who knows what they are doing atleast. if so have you checked your boost sensor on the passenger strut tower?
just a few things to check, check the TPS!!
your leaving the forum? or that's what i got from the "i got warned thread" any way have you checked the tps? it will take you 2 seconds it's only in second gear or when it happens you just don't keep going to third? and you already tuned the s-afc on a dyno right? or by someone who knows what they are doing atleast. if so have you checked your boost sensor on the passenger strut tower?
just a few things to check, check the TPS!!
06-25-02, 12:10 PM
#18
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what boost sensor, its NA. anyway, the tps is adjusted correctly by a very experienced rx7 mechanic, but he didn't know what was doing this. the s-afc is tuned, but it even did this before i put it in. i will check the timing as soon as i am done the assignment that i am supposedly doing right now, I hate university.
06-25-02, 01:10 PM
#24
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Boost Sensor is on passenger side strut tower. it looks like a the containers pellets come in for pellet guns and it has a plug in the bottom of it. Unplug it and drive your car and see if you still get the same problem