Sputtering, stalling, lean conditions
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From: San Jo F'sho
Originally Posted by S|2ocK,Apr 22 2007, 02:42 PM
sorry for the late reply but I have about 62k miles, I put the new map in and the car ran like it should again, problem solved mostly anyways, it still will go lean sometimes, like the map is jittery or something. I'll post back if the problem returns fully.
this thread diagnoses your 2,000 rpm idle issue as a faulty IAC Valve, if your problem comes back, may want to check this out.
https://www.s2ki.com/forums/index.ph...=315015&st=100
this one explains how to clean your IAC
https://www.s2ki.com/forums/index.php?showt...&#entry10226066
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From: SLC, UT
Ok...Here's a strange post for you...
I had planned on going on a long drive Sunday with some buddies. In preperation, I added a bottle of Lucas Octane Booster in addition to some Shell 93 octane. I ran my car as hard as I ever have on the street. For whatever reason, my car is no longer having partial throttle hesitation. I can't explain it. Strange huh?
I had planned on going on a long drive Sunday with some buddies. In preperation, I added a bottle of Lucas Octane Booster in addition to some Shell 93 octane. I ran my car as hard as I ever have on the street. For whatever reason, my car is no longer having partial throttle hesitation. I can't explain it. Strange huh?
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From: Mesa
Originally Posted by CourageOO7,Apr 23 2007, 09:18 AM
Ok...Here's a strange post for you...
I had planned on going on a long drive Sunday with some buddies. In preperation, I added a bottle of Lucas Octane Booster in addition to some Shell 93 octane. I ran my car as hard as I ever have on the street. For whatever reason, my car is no longer having partial throttle hesitation. I can't explain it. Strange huh?
I had planned on going on a long drive Sunday with some buddies. In preperation, I added a bottle of Lucas Octane Booster in addition to some Shell 93 octane. I ran my car as hard as I ever have on the street. For whatever reason, my car is no longer having partial throttle hesitation. I can't explain it. Strange huh?
Only thing I could think is that you blew some carbon out of the combustion chamber. Obviously it does not take much of a problem to cause the car to get upset. I guess the knock sensor could have gotten overly sensitive and the higer octane smooted it out.
At this point I would piss on a sparkplug if I thought it would help.
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From: Tampa, FL
Originally Posted by WLAURENT,Apr 12 2007, 05:29 PM
My car started doing the same exact thing today driving from Arizona to NC for the Dragon meet.
Symptoms:
- Low RPM bog in gear (below 2500 RPM). When this happens I see my AF go very lean.
- Slight popping sound from the exhaust in no-load conditions between 3500 and 4500 RPM (when holding the pedal steady)
- When I lift off the pedal while cruising (part throttle) I see my wideband go from the 14.5:1-15:1 range to 12:1 to 13:1 momentarily
- Idle droop (have had some droop since installing the SC - but it is notable worst now)
I stopped in at a dealership in Dallas and picked up a new MAP sensor - did not fix the problem. Checked for vacuum leaks and did not find any.
Only thing I noted was when I monitored the Primary O2 sensor voltage it was a very jagged/choppy sine wave (yes - I am carrying tools and a scan tool with me on the trip). If I remember correctly it was a much cleaner smooth sine wave last time I checked it.
I have confirmed that it is not related to my SC or fuel management - as I removed the belt, disconnected the engine management and tied open the bypass (essentially ran it NA).
I am going to pull the plugs as soon as the car cools down and leave the battery disconnected over night.
Interesting that my car is also a MY02.
If anyone can confirm that the voltage from the Primary O2 is supposed to be a smoother looking sine wave please let me know. If anyone has had this problem and solved it please advise.
I am currently in Jackson, MS and need to drive the rest of the way to the dragon tomorrow. I could probably stop by a Honda dealership on the way for a quick O2 sensor install if it is confirmed that it is the problem.
You can also reach me on my cell - 6 0 2 6 2 5 1 3 4 4
Appreciate any help anyone can provide
Symptoms:
- Low RPM bog in gear (below 2500 RPM). When this happens I see my AF go very lean.
- Slight popping sound from the exhaust in no-load conditions between 3500 and 4500 RPM (when holding the pedal steady)
- When I lift off the pedal while cruising (part throttle) I see my wideband go from the 14.5:1-15:1 range to 12:1 to 13:1 momentarily
- Idle droop (have had some droop since installing the SC - but it is notable worst now)
I stopped in at a dealership in Dallas and picked up a new MAP sensor - did not fix the problem. Checked for vacuum leaks and did not find any.
Only thing I noted was when I monitored the Primary O2 sensor voltage it was a very jagged/choppy sine wave (yes - I am carrying tools and a scan tool with me on the trip). If I remember correctly it was a much cleaner smooth sine wave last time I checked it.
I have confirmed that it is not related to my SC or fuel management - as I removed the belt, disconnected the engine management and tied open the bypass (essentially ran it NA).
I am going to pull the plugs as soon as the car cools down and leave the battery disconnected over night.
Interesting that my car is also a MY02.
If anyone can confirm that the voltage from the Primary O2 is supposed to be a smoother looking sine wave please let me know. If anyone has had this problem and solved it please advise.
I am currently in Jackson, MS and need to drive the rest of the way to the dragon tomorrow. I could probably stop by a Honda dealership on the way for a quick O2 sensor install if it is confirmed that it is the problem.
You can also reach me on my cell - 6 0 2 6 2 5 1 3 4 4
Appreciate any help anyone can provide
These are just my diagnoses:
-It seems to misfire at idle(I have open exhaust though) but my tuner said it could be a lean pop by just the sound.
-My car feels like it hesitate UNTIL I hit a certain throttle% and then it jolts and takes off with the power it SHOULD have through the whole powerband. It does this at ANY speed or gear, strictly throttle or map related IMO.
-At cruising/part throttle conditions it will pop and sputter all day long.
-Under slow decel, it seems to misfire making a shaky/weird "mis" pop on decel, doesnt show up if I decel from a higher RPM.
-I cannont drive slow, or the car starts to miss and shake violently until I release clutch/or accelerate.
These are just the things that I have been observing, plus the things that you guys have been mentioning. Hope this helps narrow it down possibly. And the car will run fine if I take off with decent speed.
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From: Mesa
I am 100% certain that it is not MAP, and about 90% certain it is not TPS. My TPS shows a smooth change (both the output voltage and what is displayed by the OBD scantool) through the entire range. MAP sensor was wacked, swapped and replaced with a new one.
If I disconnect the O2 sensor (also brand new) the car runs very good in open-loop - just very rich and it will not idle very well. I could see the MAP sensor effecting idle, but do not see how the TPS would cause the idle to be rough if the reading is steady-state.
If I disconnect the O2 sensor (also brand new) the car runs very good in open-loop - just very rich and it will not idle very well. I could see the MAP sensor effecting idle, but do not see how the TPS would cause the idle to be rough if the reading is steady-state.
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From: Tampa, FL
Well, my I have Chrome Pro in my car with a basemap. This same map has ran well for other motors, so its not that. My tuner has basicaly disabled my knock sensor and both 02s and it still has the same conditions... so i am really stumped on it.
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From: San Jo F'sho
I'm going to clean my IAC when i get a chance.
also i just compared my cruise control throttle cable with my friend's s2k and it looks like the nuts on my cable are secured about one rotation closer to the cruise control box than his nuts. I'm going to clean the IAC and if that doesn't solve the issue i'll adjust the cruise control throttle cable.
also i just compared my cruise control throttle cable with my friend's s2k and it looks like the nuts on my cable are secured about one rotation closer to the cruise control box than his nuts. I'm going to clean the IAC and if that doesn't solve the issue i'll adjust the cruise control throttle cable.
Thread Starter
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From: Lexington, Ky
^^ Theres a simple IAC check you can perform, Unplug it with the engine on and running, the car should rev and stay there(need to check my manual on this part), another check is to take off your intake and plug the two small holes inside the throttle body, if the car dies the IAC is bad. i think your wasting your time cleaning it, worth a shot I guess.
