random misfires/rev limiters

98vtec · Post by **98vtec** » Fri Jul 25, 2008 12:16 am

im gonna JB weld my old IAT sensor onto the intake nipple that goes to the breather tomorrow and see what happens....

I love this program so much when there are no errors.

98vtec · Post by **98vtec** » Sat Jul 26, 2008 3:45 am

new update: replaced IAT sensor with the \"stock\" one and everything is good now with that. I had to add 10% fuel everywhere since the IAt comp tables where screwy due to tuning it with the wrong compensations. Anyway, that still did not fix my problem. I am using a multiport USB distributor which runs my ostrich and datalogging cable. I discovered that the ostrich or datalogging cable doesnt even need to be connected to ectune in order for the engine to operate as it should. It just has to be plugged in and everything is great. Well calvin told me to disconnect all that and plug just the datalogging cable to the ecu and see if i can log the ghost limiter. My thoughts were...duh, why didnt i think of that. Well i did exactly that. Plugged just the datalogger to the laptop and went for a drive and i couldnt get it to do anything. I went for an hour drive and called it quits, then went for another 30 minute drive and still no ghost limiter.....The laptop is somehow supplying power to the ecu to keep it from doing whatever it is doing with everything disconnected and i dont understand what the problem is. I am completely baffled. my only other option is to use another ecu.

98vtec · Post by **98vtec** » Wed Jul 30, 2008 4:52 pm

well i havent got much of an update. School has been keeping me busy and im in the process of moving so my other chipped ecu is somewhere in storage but i did find another thing. For a little while the car would run great with just the logging cable being power through the laptop and thus to the ecu, however, i noticed that the engine would die sometimes when i let off the throttle and it doesnt do that with both the logger and ostrich connected and power through the laptop. and for the logging issue, my computer is running two 512MB memory cards and i just purchase two 1GB memory cards to replace both of the existing 512MB cards so i will have double the memory and that should fix the logger from freezing up in real-time. once i get settled into the new place, i'll find the other ecu and test it out.

98vtec · Post by **98vtec** » Mon Aug 04, 2008 1:33 pm

so all the sudden these limiters went away. i didnt change anything either. Just forgot my computer one day and was expecting to have a miserable drive and turns out it was perfect. Been driving without the laptop connected for a couple days without any hiccups. go figure... also, my memory cards came in today so we'll see what happens with datalogging.

98vtec · Post by **98vtec** » Wed Aug 27, 2008 8:17 pm

another update: it appears that if i run the car for a couple days always having the computer connected for power, i can run without it for a couple days then it will do the limiter deal. I was wondering if this could possibly be an alternator problem?

Post by **calvin** » Wed Aug 27, 2008 9:46 pm

i had weird problems like a limiter. It was my resistor box plug;)

98vtec · Post by **98vtec** » Thu Aug 28, 2008 5:38 pm

the RDX are saturated so a resistor box wouldnt be the problem

I'm beginning to lean towards the TPS being at fault. Today i was driving around and decided to do another test. I revved the engine to one rpm and didn't let it drop...say 3000 rpm. Once it got to that point, the rpm would drop down to about 2500. I need to go get my damn multimeter but this guys house is like 30 minutes away, lol.

98vtec · Post by **98vtec** » Thu Sep 04, 2008 7:39 pm

another update: completely recalibrated the TPS back to factory settings and used the TPS calibration tool in eCtune. I also removed the wideband ground from the thermostat engine harness ground completely to see if this thing would go away. still here. Started driving around and messing with some things in real time. When i would make a change in the map, the engine would hesitate then go back to normal. Did this a couple times and it stopped. I also noticed that sometimes while logging, it will not go above 0% TPS when i am under 5-6%. Once i go above that, it will show 5-6%+ but it will not show that i am at 1%. The voltage will go up as i press the throttle but the percentage will not. I'm also still having problems with the datalogging freezing up and the cell tracer disappearing randomly. And i know my computer has enough ram, i added a lot of memory. Only thing left to do is try another ecu but i am going to switch back to crome tonight maybe and see if the problem still exists.

98vtec · Post by **98vtec** » Thu Sep 04, 2008 8:50 pm

made the switch back to crome and all hell has broken loose. I dont know what the F is going on. i switched to crome, started right up. Drove around for about a mile and the engine shut off. Started up again and ran for about 20 seconds then shut down again. It flashed a check engine light everytime it shut off. The code is 15. wtf is 15? It doesnt even show up in my service manual. Anyway, i made my way to a parking garage so i could sit and figure this out....i had to coast with the engine off into it because it wouldnt start back up again. switched back to ectune and it idled fine, but as soon as you put mid-load on the engine, it shut off and wouldnt start back up. So i let it sit for about 10-15 minutes and tried to restart the engine. It started but it took about 6-7 turns before it barely started. Thankfully i live close and i at least got the car within a block of my house so i am back now trying to figure this bullshit out.

Post by **calvin** » Thu Sep 04, 2008 9:27 pm

98vtec wrote:another update: completely recalibrated the TPS back to factory settings and used the TPS calibration tool in eCtune. I also removed the wideband ground from the thermostat engine harness ground completely to see if this thing would go away. still here. Started driving around and messing with some things in real time. When i would make a change in the map, the engine would hesitate then go back to normal. Did this a couple times and it stopped. I also noticed that sometimes while logging, it will not go above 0% TPS when i am under 5-6%. Once i go above that, it will show 5-6%+ but it will not show that i am at 1%. The voltage will go up as i press the throttle but the percentage will not. I'm also still having problems with the datalogging freezing up and the cell tracer disappearing randomly. And i know my computer has enough ram, i added a lot of memory. Only thing left to do is try another ecu but i am going to switch back to crome tonight maybe and see if the problem still exists.

weird that your datalogging tps shows so weird and that datalogging freezes

98vtec · Post by **98vtec** » Thu Sep 04, 2008 10:35 pm

i found that code 15 is the ignition output signal.

Post by **calvin** » Thu Sep 04, 2008 10:45 pm

makes sense.. do u use IGN cut in eCtune? if yes it disable the ICM error.. could explain some edit: just check it always disable ICM not only for IGN cut rev. fixing that now

98vtec · Post by **98vtec** » Fri Sep 05, 2008 7:12 pm

yea i use fuel and ignition cut. well i went to the car this morning. Connected the ostrich and logger and started recording upon. I am attaching the log file: I noticed the ELD code and disabled ELD. After doing this, the engine revved up for a second like it was at cold start idle then idled back down, i guess resetting itself. Engine started up immediately (not even a full turn) and drove perfect. I also tried just using fuel cut and it does the same thing. I can drive the car normal if i hardly use the throttle, but if i put some load on the engine, it will cut out. Then once this happens, the engine will idle higher and wont go back to normal unless i shut it off and restart

Post by **calvin** » Fri Sep 05, 2008 7:21 pm

curious did you try to make a new cal from scratch only import tables? post current cal

98vtec · Post by **98vtec** » Fri Sep 05, 2008 7:36 pm

i have custom RPM scalars so importing it to a new cal without changing the scalars would require me to do a full retune for the most part. But i may try that if it comes down to it.