Kenji's P28 - Hunting Idle. Stock P73 - Regular idle. Wierd....
11-21-2002, 05:17 PM
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Kenji's P28 - Hunting Idle. Stock P73 - Regular idle. Wierd....
Ok. I'm borrowing a board member's P28 by Kenji. So I know it works just fine, must be my car...
Here's the story...
With my stock ecu, my idle is often around 1000-1100. Idle seems to 'slowly' (i.e., VERY slowly) move itself down towards 750 after being on the highway or kept at a certain rpm for a length of time.
I put the P28 in today, and started up the car. Same old, so I thought. I blipped the throttle a few times before backing out of the driveway. I stopped to clean up a few things in the garage and let the car idle. Vroom (up), vroom (down), over and over. RPM is going from 750 to 1750 like clockwork. I've read a million times on h-t about that. I drive around the block and it continues. I then get on to a few main roads and open it up a big. Nice difference from the stock ecu in the midrange.
I pull back in the garage, no idle problem, dead on 750rpms. The car was warmed up the entire time, so I don't suspect that the idle hunting has anything to do with being cold.
Anyone have any ideas? I'm stumped. I'm worried this is a sign that something (tps, iacv, something else) is not quite right under my hood, something that oddly enough my stock ecu obviously doesn't care about.
Here's the story...
With my stock ecu, my idle is often around 1000-1100. Idle seems to 'slowly' (i.e., VERY slowly) move itself down towards 750 after being on the highway or kept at a certain rpm for a length of time.
I put the P28 in today, and started up the car. Same old, so I thought. I blipped the throttle a few times before backing out of the driveway. I stopped to clean up a few things in the garage and let the car idle. Vroom (up), vroom (down), over and over. RPM is going from 750 to 1750 like clockwork. I've read a million times on h-t about that. I drive around the block and it continues. I then get on to a few main roads and open it up a big. Nice difference from the stock ecu in the midrange.
I pull back in the garage, no idle problem, dead on 750rpms. The car was warmed up the entire time, so I don't suspect that the idle hunting has anything to do with being cold.
Anyone have any ideas? I'm stumped. I'm worried this is a sign that something (tps, iacv, something else) is not quite right under my hood, something that oddly enough my stock ecu obviously doesn't care about.
11-21-2002, 05:23 PM
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Re: Kenji's P28 - Hunting Idle. Stock P73 - Regular idle. Wierd.... (1107)
Chris - I've never had the problem with the ECU.
Did you disconnect the battery when you swapped out the ECU?
Also, did you let the car run with the ECU for several minutes without tapping the throttle?
Did you disconnect the battery when you swapped out the ECU?
Also, did you let the car run with the ECU for several minutes without tapping the throttle?
11-21-2002, 05:26 PM
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Re: Kenji's P28 - Hunting Idle. Stock P73 - Regular idle. Wierd.... (Cosworth)
Yea, this all happened AFTER letting the car sit and idle. Battery was disconnected, etc. Maybe i'll go try again and let it sit for a few minutes longer.
Like I said, I KNOW it isn't the ecu, since you had no problems with it at all. Just thinking it was an indicator that something was odd with my car.
Like I said, I KNOW it isn't the ecu, since you had no problems with it at all. Just thinking it was an indicator that something was odd with my car.
11-21-2002, 05:31 PM
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Re: Kenji's P28 - Hunting Idle. Stock P73 - Regular idle. Wierd.... (1107)
From Sean, from a post in a thread by Raging Angel:
does anyone else have this problem, and should i not be concerned about it happening on my car, but not others who have used this very same ecu??
I'm going to do a little more playing around to see if the idle hunting persists and find the big vacuum hose and do some pinching.
[Modified by 1107, 6:36 PM 11/21/2002]
"The P28 ecu turns on the purge control solenoid at idle; with a type-r manifold, that means a large vacuum leak. On the D16 SOHC engine, the purge vacuum source is ported vacuum coming off of the throttle body, as opposed to the type-r which uses straight intake manifold vacuum. The type-r ecu only allows purge control activation above a certain rpm/manifold pressure (I'm not sure which, I would have to look it up ). The big vacuum hose going to the purge control valve on the firewall is where leak is. Unplug the electrical connection to that valve and see if you still get the symptoms. Or pinch the hose with needlenose pliers. Good luck."
I'm going to do a little more playing around to see if the idle hunting persists and find the big vacuum hose and do some pinching.
[Modified by 1107, 6:36 PM 11/21/2002]
11-21-2002, 05:40 PM
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Re: Kenji's P28 - Hunting Idle. Stock P73 - Regular idle. Wierd.... (1107)
Foo, try driving 4mins below 3500 rpm. Then check, I bet it stay at 750-800rpm.
Most likely you warmup the car improperly.
Most likely you warmup the car improperly.
11-21-2002, 05:48 PM
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Re: Kenji's P28 - Hunting Idle. Stock P73 - Regular idle. Wierd.... (ITR GURU)
the Kenji ecu's do not read all of the sensors of the stock ecu's so a bit of a idle problem occurs once the car is warm its fine.
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11-21-2002, 06:20 PM
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Re: Kenji's P28 - Hunting Idle. Stock P73 - Regular idle. Wierd.... (ArmyGreen EG)
the Kenji ecu's do not read all of the sensors of the stock ecu's so a bit of a idle problem occurs once the car is warm its fine.
As for the question, the p28 on my car has a slight fluctuation during cold starts but not as drastic as what you're experiencing. Mine goes from 1350 to ~1225 approx 5 times but once warm, it fluctuates from 735 to 755 according to the VAFC.
11-21-2002, 08:44 PM
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Re: Kenji's P28 - Hunting Idle. Stock P73 - Regular idle. Wierd.... (TypeR76)
No worries. Thanks for the info. I just wanted to be sure that it wasn't something with MY car/engine, since i knew it wasn't some ecu error.
After driving around tonight, it went away. DIdn't really come back, and nothing i couldn't get used to if this ecu was here to stay.
After driving around tonight, it went away. DIdn't really come back, and nothing i couldn't get used to if this ecu was here to stay.
11-22-2002, 04:19 AM
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Re: Kenji's P28 - Hunting Idle. Stock P73 - Regular idle. Wierd.... (1107)
George,
You took the words right out of my mouth
. Thanks for posting that info for me.
A few cars may experience idle issues. These can easily be fixed and I provide technical support to all of my customers (and just about anybody else). If you are experiencing issues with any of my products please let me know so I can tell you how to correct them.
The idle adjustment screw will fix low idle and surging idle conditions.
The quote above will fix hard start-up conditions on all cars that have an OBD2 to OBD1 ECU conversion harness. This applies to ALL OBD2 to OBD1 ECU conversion harnesses, not just mine.
If anybody has any questions please ask.
I want to take this opportunity to thank all of the people who purchased ECUs and harnesses from me. I also want to thank all of you for the kind words and support on this board regarding my products.
I do virtually no advertising. All of my business over the years have come from word of mouth and without you guys I would not be where I am now. Thank you all.
-kenji
You took the words right out of my mouth
. Thanks for posting that info for me.A few cars may experience idle issues. These can easily be fixed and I provide technical support to all of my customers (and just about anybody else). If you are experiencing issues with any of my products please let me know so I can tell you how to correct them.
The idle adjustment screw will fix low idle and surging idle conditions.
The quote above will fix hard start-up conditions on all cars that have an OBD2 to OBD1 ECU conversion harness. This applies to ALL OBD2 to OBD1 ECU conversion harnesses, not just mine.
If anybody has any questions please ask.
I want to take this opportunity to thank all of the people who purchased ECUs and harnesses from me. I also want to thank all of you for the kind words and support on this board regarding my products.
I do virtually no advertising. All of my business over the years have come from word of mouth and without you guys I would not be where I am now. Thank you all.
-kenji
11-22-2002, 05:06 AM
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Re: Kenji's P28 - Hunting Idle. Stock P73 - Regular idle. Wierd.... (kenji)
Thanks Kenji.
Again, just so I'm clear, I never thought this was a 'defect' in Kenji's ecu/harness. Just concerned about a sensor or something being bad in my car. Now that I know what the real problem is.... thanks, no big deal.
By the way,
on the ecu and harness.
Again, just so I'm clear, I never thought this was a 'defect' in Kenji's ecu/harness. Just concerned about a sensor or something being bad in my car. Now that I know what the real problem is.... thanks, no big deal.
By the way,
on the ecu and harness.
11-22-2002, 06:26 AM
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Re: Kenji's P28 - Hunting Idle. Stock P73 - Regular idle. Wierd.... (kenji)
I do virtually no advertising. All of my business over the years have come from word of mouth and without you guys I would not be where I am now. Thank you all.
-kenji
j/k
11-22-2002, 09:15 AM
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Re: Kenji's P28 - Hunting Idle. Stock P73 - Regular idle. Wierd.... (1107)
I have the same problem with my car using Hondata Stage II and a P28 ECU.
I'm going to see if this "fix" helps my car too.
BPR
I'm going to see if this "fix" helps my car too.
BPR
11-22-2002, 03:32 PM
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Re: Kenji's P28 - Hunting Idle. Stock P73 - Regular idle. Wierd.... (Big Phat R)
I hope my P28 and Hondata stage 2 didn't have this problem, if not, I will have to save this thread!!
11-25-2002, 08:45 AM
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Re: Kenji's P28 - Hunting Idle. Stock P73 - Regular idle. Wierd.... (Austin)
I was having this problem with my hatch, I have a OBD2 B16A2 from a 99 SI and a Skunk2 ecu and conversion harness. I was getting a hunting Idle after my car would warm up but It would only go away after a month or so and playing with the idle screw. Then every time I disconnect the battery it would reset the ECU and I'd be back to square one.
After reading this I disconnected my EVAP sensor and the idle is steady. But my problem is now, that the weather is very cold, the engine wants to stall out when starting my car in the morning. I have to keep my foot on the gas on until the car warms up, but once warm it's fine. Any thoughts?
After reading this I disconnected my EVAP sensor and the idle is steady.
But my problem is now, that the weather is very cold, the engine wants to stall out when starting my car in the morning. I have to keep my foot on the gas on until the car warms up, but once warm it's fine. Any thoughts?
12-27-2002, 07:37 AM
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Re: Kenji's P28 - Hunting Idle. Stock P73 - Regular idle. Wierd.... (6ghatch)
i am having the same prolem with my p28 i dont have the evap hooked up but i still get the hunting idle what to do what could be wrong???
12-27-2002, 10:35 AM
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Re: Kenji's P28 - Hunting Idle. Stock P73 - Regular idle. Wierd.... (b18vtec)
Maybe you need a new Throttle Position Sensor (TPS). IF you have unplugged the evap solenoid and still have hunting idle, i'd say that is your problem, TPS.
12-27-2002, 10:51 AM
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Re: Kenji's P28 - Hunting Idle. Stock P73 - Regular idle. Wierd.... (Chris N)
OT: ............. Chris N ........... what the hell did you do wrong to get the Eye of Sauron on you!! 
12-27-2002, 10:55 AM
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Re: Kenji's P28 - Hunting Idle. Stock P73 - Regular idle. Wierd.... (TypeR0207)
OT: ............. Chris N ........... what the hell did you do wrong to get the Eye of Sauron on you!!
OT: I tried to grab a better pic of the Eye from the DVD I have, tried to use the printscreen program I have, but it was doing some odd things, so I had to settle for this eye.
12-27-2002, 10:58 AM
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Re: Kenji's P28 - Hunting Idle. Stock P73 - Regular idle. Wierd.... (Chris N)
LOTR rules ......... just got the extended DVD, halfway through it last night before wife started falling asleep and we went to bed ........
Sorry ....... no thread hyjacking .....
Sorry ....... no thread hyjacking .....
12-27-2002, 11:12 AM
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Re: Kenji's P28 - Hunting Idle. Stock P73 - Regular idle. Wierd.... (Chris N)
Tell me about it. His Im screen pops up and i see the eye first. ahahha
cool avatar, Chris.
cool avatar, Chris.
12-29-2002, 11:42 AM
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Re: Kenji's P28 - Hunting Idle. Stock P73 - Regular idle. Wierd.... (Chris N)
for starters the tps is brand new from the spoon throttle body but the hunting idle has stopped do to the test pipe i put on could it be that there was to much back pressure ???