Like title says, when I am cruising 2000 and up RPM at about 3-4% TPS , and SLOWLY press down on the throttle to accelerate I am getting a horrible rich AFR spike. I am slowly pushing the throttle and holding it only, say from 4% tps to 8% tps. Wideband will read down into the high 10 AF ratio for a split second then slowly rise back to normal/designated AFR. The problem gets worse the more I drive the car (seems to be worse at the end of an hour cruise than at the beginning). ECT is 190+ at all times when problem is visable. I have tried adjusting throttle tip in, readjusted/replaced TPS, MAP, even leaned out my mapping in the affected area but problem is still consistent. I havent changed any of the compensation values at all. Only problem I can notice is it seems everytime I read my TPS values the closed value changes (between .46 and .6) overrun fuel cutoff is .9 and delay is 100ms.
B20Z Bottom -PR3 Head
B16 Map added 20% fuel - tuned
Replaced B16 Ign Maps with the preloaded ITR Ign maps. (Same Problem Present)
99 EM1, jumper harness. S300 In a P75 ECU so a solenoid is being used to run vtec.
By the way, If you can quickly tell me how to upload my cal I will post it, Im sure that will help!!
RICH AFR spike partial throttle ?
Re: RICH AFR spike partial throttle ?
I've started to drive the car some more and noticed the issue now seems more intermittent. Like I said before it does it only when the car is HOT and heat soaked, if I cruise around town stoplight to stoplight the problem occurs, but when I cruise the highway it seems to slowly disappear. The rich spike is at about 18% tps and ONLY above 2000 rpm. As soon as 2000 rpms comes around it happens.
This is really irritating , and I'm hoping someone has ran into this problem before and may have some insight on it.
Thankss
This is really irritating , and I'm hoping someone has ran into this problem before and may have some insight on it.
Thankss
Re: RICH AFR spike partial throttle ?
http://www.hondata.com/forum/faq.php
Without the calibration and datalogs showing the problem it is impossible to guess what is happening.
Without the calibration and datalogs showing the problem it is impossible to guess what is happening.
Re: RICH AFR spike partial throttle ?
Found the problem finally! Something to do with the purge valve between the charcoal canister and the intake manifold. All i had to do was unplug it from the harness and problem fixed.
Re: RICH AFR spike partial throttle ?
Bring up an old post from the grave yard, but I too ran into the 10:1+ spikes upon throttle tip. Primarily on high way speeds. Also found the culprit to be the EVAP purge
(log showed PSP valve operating while symptom present)
Seems as if the problem is else where- tested the entire EVAP systems, and all with in factory spec. Its a 97gsr. 11:1 compression, stock cams, stock injectors, high flow intake and exhaust.
Any body have any thoughts on this; a fuel soaked canister, ect... because I'm not a firm believer in not allowing my canister not to purge it self-
Is it safe to disconnect that system? Opinions of the best way to do so R welcome...
(log showed PSP valve operating while symptom present)
Seems as if the problem is else where- tested the entire EVAP systems, and all with in factory spec. Its a 97gsr. 11:1 compression, stock cams, stock injectors, high flow intake and exhaust.
Any body have any thoughts on this; a fuel soaked canister, ect... because I'm not a firm believer in not allowing my canister not to purge it self-
Is it safe to disconnect that system? Opinions of the best way to do so R welcome...
Re: RICH AFR spike partial throttle ?
Have you tried inverting the purge output in Misc. Parameters?
Re: RICH AFR spike partial throttle ?
Thanks for the reply,
I inverted the purge switch some time ago to learn, and found the car ran poorly at idle. So I switched that parameter back and left it. This is a fairly new symptom, but the A/F ratio spike got richer and richer, until it would bog down while driving on the highway, part throttle cruising. With the Innovative wide band gauge reading past 10:1, into "rich", to rich to measure i guess. Cant be good for the car, so Its temperately disconnected.
Does Honda program a different table/map while purging the EVAP canister do to the fact that the fuel vapors with fatten up the mixture?
Running a P30/s300. Mild B18C NA build, 11:1 JE Forged pistons, stock cams, injectors, ect...
I inverted the purge switch some time ago to learn, and found the car ran poorly at idle. So I switched that parameter back and left it. This is a fairly new symptom, but the A/F ratio spike got richer and richer, until it would bog down while driving on the highway, part throttle cruising. With the Innovative wide band gauge reading past 10:1, into "rich", to rich to measure i guess. Cant be good for the car, so Its temperately disconnected.
Does Honda program a different table/map while purging the EVAP canister do to the fact that the fuel vapors with fatten up the mixture?
Running a P30/s300. Mild B18C NA build, 11:1 JE Forged pistons, stock cams, injectors, ect...
Re: RICH AFR spike partial throttle ?
No, there is not a sepparate map for when it is active. Have you tried just unplugging the evap purge valve to see if the problem goes away?
Re: RICH AFR spike partial throttle ?
Yes, with the PSP solenoid unplugged, the symptom goes away completely.
Sounds like normal operation wouldn't change A/F all that much.
The shell is a 96 GSR 2 door, with original equipment, as far as EVAP systems.
I have the EVAP Purge inlet hose routed per instructions from Skunk2, as I am using their Pro Manifolds. This "T"'s the Purge into the PCV vacuum line.
I attached My curent tune and a small log of the problem occuring, if that helps.
I "stretched" out the amount of cells, as I am ironing out some small wrinkles on the street tune. Will re-shrink later.
I've been running s300 for two years now.
Thanks for your time.
Sounds like normal operation wouldn't change A/F all that much.
The shell is a 96 GSR 2 door, with original equipment, as far as EVAP systems.
I have the EVAP Purge inlet hose routed per instructions from Skunk2, as I am using their Pro Manifolds. This "T"'s the Purge into the PCV vacuum line.
I attached My curent tune and a small log of the problem occuring, if that helps.
I "stretched" out the amount of cells, as I am ironing out some small wrinkles on the street tune. Will re-shrink later.
I've been running s300 for two years now.
Thanks for your time.
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Re: RICH AFR spike partial throttle ?
This sounds like more of an issue with the plumbing of your evaporative emissions system than with the ECU. If this were a software problem I'm sure everyone would have the same issue.
Re: RICH AFR spike partial throttle ?
Agreed, its probably something simple I'm over looking. Thanks for your thoughts and knowledge.
I'll re-post if/when its figured out.
I'll re-post if/when its figured out.