Another tip-in jerking question........

thething96 · Post by **thething96** » Mon Dec 21, 2009 2:13 pm

Thank you very much, I'll post today a.s.a.p.......

thething96 · Post by **thething96** » Tue Dec 22, 2009 7:10 pm

Here's the latest. I thought that maybe the rc injectors might be kinda crappy, so I decided to put the stock injectors back on. After getting afr's good, I took the car for a spin, and the issue still remains, even with stock injectors. After that, I swapped the chipped ecu for the stock unit, which is a 99' GSR ecu (car is a 99' GSR with a 98' USDM Type R) and the car actually drives worse. The tip in jerking is slightly rougher, and moving idle is very unstable. I've always had moving idle issues with ectune on this car, but the stock ecu idles worse. As you can see on my previous cal, idle settings are weird, but I've tried moving those settings, and idle is still erratic. So long story short, I'm ABSOLUTELY out of IDEAS. As previously stated, the tps and map sensors were both changed. Distributor cap, rotor, and wires are kind of new, so i have No clue!!!!! Here's the cal and log. The afr's on the log are very erratic. It started snowing yesterday, and since it's snowy and humid, the wideband started acting up, possibly by the connection from the harness to the sensor. I had this happen on another AEM wideband as well, but there's some good spots on the log to look at. If you see the log, I stayed as close as possible to 2000 rpm for at least 4 seconds, then I increase throttle. So keep an eye out for any 2000rpm cruising. Something I noticed is that if I cruise above 8%tps, the jerking doesn't occur, but any thing less than 7% throttle, and it'll start bucking. My assumption is that this is happening around 6-7% throttle. Thanks...

Post by **Bugermass** » Wed Dec 23, 2009 12:48 pm

What exactly is your engine setup as of now? I see that closeed loops is cause huge swings in AFR. How far back in the exhuast is your O2 sensor? What kind? You need to completely disable closed loop and do another log so I can see whats going on.. Right now looking at your logs is look as if closed loop is causeing your issue. So disable it and take another log of the problem.. Also your maps are super duper smooth.. While it looks nice it may not be ideal fueling for your setup.. I've never seen a properly tuned out part throttle honda map look like this.. Do another log with closed loop turned off and lets see if there may be issues with the fuel map causing these problems..

thething96 · Post by **thething96** » Wed Dec 23, 2009 3:02 pm

Sorry about the messed up afr's. It's been snowing and raining for the last couple of days. Since the connector from the wideband gauge to the oxygen sensor got wet, it started acting up. The setup is as follows... -99' GSR body. -98' USDM Type R. -CP Pistons, 10.5 compression. -ARP head, main, and rod studs/bolts. -ACL bearings. -AEM intake. -AEM wideband. -eCtune pro ostrich. -po6 xenocron ecu. -NGK blue wires. -Honda cap and rotor. -NGK 4554's(used bkr7e's as well). -Kamekazee header. -Stock exhaust. -Stock rods. -Stock cams. -Stock head, intake manifold, and throttle body. -Honda gaskets all the way around. The wideband sensor is right in front of the first stock(which is denso) o2 sensor, about 30-32 inches, as specified by AEM.

After that, I swapped the chipped ecu for the stock unit, which is a 99' GSR ecu (car is a 99' GSR with a 98' USDM Type R) and the car actually drives worse. The tip in jerking is slightly rougher, and moving idle is very unstable.

Why do you think the stock ecu/injectors would do the same? When I first did the swap, I used the stock ecu for about 2 months, and the car ran good, steady idle and nice tip-in. Some how even though it's a second tps, that seems to be it. Maybe some type of tps \"dead spot\", if that even exists. According to the datalog, tps scaling seems good.Ill post new log as soon as I get home. Thank you...

thething96 · Post by **thething96** » Wed Dec 23, 2009 6:06 pm

Here's the second log. The jerking is deffinetly happening in between 7-9% throttle,and the problem seems to happen at 8%. Thanks...

marshall.hagen · Post by **marshall.hagen** » Wed Dec 23, 2009 6:58 pm

I don't think this is ECU related if the problem persists with an stock ECU. I had one hell of a time diagnosing a low speed, low throttle jerking on a friends car. Ended up being two of the clutch springs broke. We replaced the clutch, resurfaced the flywheel, and the jerking went away. Good luck.

thething96 · Post by **thething96** » Wed Dec 23, 2009 7:18 pm

This jerking issue happens in any gear, but harsher on 4th and 5th, anywhere from 5-45mph. But it's more noticeable in between 2000-3000rpm. And I did a mini test drive with crome, and crome doesn't do it, which is even weirder. And I too think that it's not ecu related as well.....

thething96 · Post by **thething96** » Sat Dec 26, 2009 1:49 pm

Any suggestions???

jpjackson · Post by **jpjackson** » Tue Dec 29, 2009 8:06 am

for some reason i cant open your log file in ectune but you say you are using aem uego wide-band? how old is it? are you running analog? if so what is your offset? i was having similar problems and i was using the aem, and part throttle between like 3-9% my car would buck and fall on its face, i just got a new innovate lc-1 and running serial and im running 110% better, turns out i was running pig rich and at cruising when i gave it a little more throttle it would buck and bog down at first but once boost started kicking in it was fine. i would try a different wide-band if i were you and see what happens. my maps are ugly as hell but it runs alot better. i sent calvin a pm to see which wide-band he recomended to use and he said innovate lm-2 or lc-1. Chris at xenocron got my lc-1 to me the next day overnight-ed, awesome and friendly service, i wont order anything ecu or electronics related parts from anywhere else.

jpjackson · Post by **jpjackson** » Tue Dec 29, 2009 8:12 am

from what i have read on this post, hearing that your maps are smooth and you are using aems wide-band, it sounds to me like you are running rich on light and part throttle.

thething96 · Post by **thething96** » Tue Dec 29, 2009 2:50 pm

I'll repost log again. Afr's are good on the current tune. The thing is, the stock ecu has the same issues, and I can't figure out why it's doing it too. When I run the stock ecu, I undo the wideband and have the ecu run with the stock o2 sensors. Things done so far are: changed tps, changed map, replaced iacv, replaced cap and rotor, replaced spark plugs, redid all vacuum caps and lines, changed throttle body and intake manifold gaskets,and checked distributor ignition timing. I also checked cam timing. I was under the impression that the intake cam was off because in orded for the igniion timing to be set right, the dizzy had to be almost all the way advanced. So I adjusted the intake cam, and now the dizzy has to be almost all the way back to be set right. Adjusted low cam fuel after moving the intake cam, and afr's are ok,but there's no difference in tip in and idle problems, runs the same as before. The very last thing to do is to get a different dizzy..... and after that, who knows.......

jpjackson · Post by **jpjackson** » Tue Dec 29, 2009 2:57 pm

how is your wide band connected to the ecu? or are you running serial? i had major offset problems where the guage and my lap top matched at crusing and light throttle but wot was off, it was showing leaner thatn it was and i was adding more fuel. the main thing is how old the aem uego is and how do you have it connected? my aem was causing all of my problems, so....... yes it ran the same on a differant ecu and on the stock o2, but you tuned the map using the aem wide band so........ i would check that because you have replaced everything else so.......

thething96 · Post by **thething96** » Tue Dec 29, 2009 4:26 pm

the wideband is 6 months old...

jpjackson · Post by **jpjackson** » Tue Dec 29, 2009 5:08 pm

how do you have it connected and if its analog, what is your offset?

thething96 · Post by **thething96** » Tue Dec 29, 2009 6:51 pm

it's wired to d14, and it's used as wideband input, using aem's voltage tables, and changed a bit to make datalog and gauge as close as possible, no offset(zero). But again, using the stock untunable obd2 ecu with stock o2 sensors creates the same jerking effect, which in that case, wouldn't be wideband related. And afr's don't always relate to the problem. Even at light throttle at 14.0 afr, the bucking will still occur(which 14.0 afr is good, not lean at all) but if the wideband is off, then that could be it, and the tune will be off. But again, stock ecu acts the same, if not worse.....