Running rough with Flash ECU

I've got a 1st gen Plug and Play ECU for my 91 stealth rt tt
My mods are intake and a down-pipe with no main cat and no front pre-cat.
I've wired the Flash ECU just like it says on chromedecu.org I've double checked all the wires and then checked them again few more times to make sure I've installed them correctly.

The car ran great with the flash ECU until she warmed up. Once warmed up the following happens:
-When starting from a stop I give it gas and engage the clutch, once I start to roll and my foot is off the clutch the car stutters and jerks as if its my first time driving a manual.
-Also sometimes it feels like there is no power even when I floor it, but once I floor it for a few sec eventually the power comes in.
-There is also a very loud knocking sound coming from the engine bay when I'm in neutral. The sound goes away when I push in the clutch pedal.

Only thing I've done to the ECU is disabled Periphery 2 bits 15, 14, 13, 11, 10, 9, 3 and 1.
I've also changed Periphery 0 Bit 2.
But no changes to how my car behaved.

I don't feel save driving around with these issues. I've put the stock ECU back in, and she runs like a champ, no issues what so ever.

I've asked about this on a local forum and they recommended me posting this thread on this site.

I'm still new to this and need some guidance, any input would be much appreciated.

Thank you for reading.
-Nick.

could you post a 5 minute log?

Also, are you trying to say that there is a loud noise related to your transmission that goes away on the stock ecu? :confused2:

Email me the ROM saved to your ECU currently.

nonstopmix@gmail.com

Quote:

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Originally Posted by Forest Gump

could you post a 5 minute log?
Also, are you trying to say that there is a loud noise related to your transmission that goes away on the stock ecu? :confused2:

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Yes there is a loud knocking noise that goes away when I push in the clutch or rev up my RPMs a bit, this noise doesn't exist with the stock ECU.
Unfortunately I don't have any logs yet. Didn't want to run the car for any more time with those problems. As soon as the knocking started I drove her carefully home and shut her off asap. But if its a must, I could find some time either today or tomorrow to get it done.

Quote:

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Originally Posted by Greg E

Email me the ROM saved to your ECU currently.
nonstopmix@gmail.com

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Just sent you my ROM from my username at yahoo. Thank you for taking a look.

was your idle super low?

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Originally Posted by Forest Gump

was your idle super low?

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He's probably hearing that dash relay click when the RPMs drop really low.

or he is hearing clutch spring rattle when the rpms get really low . . . some times a stock clutch with slightly worn springs will sound pretty chatty as a car stalls out . . . mine will even do it . . . LOL

Quote:

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Originally Posted by Forest Gump

could you post a 5 minute log?

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Who does a 5 min log? :blink:

Quote:

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Originally Posted by Greg E

Email me the ROM saved to your ECU currently.

nonstopmix@gmail.com

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Its the V2 rom. He shot it my way but i couldn't see any issues with it. Sent him in the direction to disable the emissions peripheries and set proper timing latencies for 1st gen. About as far as i got with it.

Quote:

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Originally Posted by ChargerX3

Who does a 5 min log? :blink:

Its the V2 rom. He shot it my way but i couldn't see any issues with it. Sent him in the direction to disable the emissions peripheries and set proper timing latencies for 1st gen. About as far as i got with it.

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There are no peripheries to disable the emissions equipment. Only the CELs.

Quote:

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Originally Posted by 99 vr4

or he is hearing clutch spring rattle when the rpms get really low . . . some times a stock clutch with slightly worn springs will sound pretty chatty as a car stalls out . . . mine will even do it . . . LOL

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That noise sounds absolutely nothing like a knock nor would it come/go with an ECU swap.

Quote:

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Originally Posted by ChargerX3

Who does a 5 min log? :blink:

Its the V2 rom. He shot it my way but i couldn't see any issues with it. Sent him in the direction to disable the emissions peripheries and set proper timing latencies for 1st gen. About as far as i got with it.

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It would take very little logging to possibly spot the issues as his issues are immediate.

I did get some logging done last night but boy is it hard to find a road with a long enough stretch to top out the 3rd gear, in my area.
There are a few spots where I could easily go over 130 comfortably and safely but that's including going through first and second gears first.
With out compromising safety even further outside my comfort zone and cutting it close to the end of the road, I've barely managed to get my 3rd gear up to 6000RPM at which my speedometer was showing me a little over 120mph.

There is so much lag up until 2500rpms in every gear. If I floor it before that area there is just no power and once it reaches 2500 rpm it kick in like a mule. (Under normal driving it still kicks just not as hard)
Once I floor it and my turbos eventually spool up my boost spikes to 15psi at 2500rpm on my after market gauge and then comes down to the usual 9psi by 3500rpm.

Quote:

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Originally Posted by Forest Gump

could you post a 5 minute log?

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I'm not sure what you mean by a 5 min log. I've got a few logs of my 3rd gear pull from 35,40 mph to 120mph and a few of me driving normally in the city and the freeway.

I'm not sure how to post logs on here: copy and paste from excel as text? Screen shot it and post it as a pic? Any other ways?

Quote:

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Originally Posted by Forest Gump

was your idle super low?

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A pic of my stock ECU idle fully warmed up
https://sphotos-b.xx.fbcdn.net/hphot...82800261_n.jpg
A pic of my Chromed ECU idle fully warmed up
https://sphotos-a.xx.fbcdn.net/hphot...21241756_n.jpg


Here is a video of my clutch chatter/knocking at idle
http://www.youtube.com/watch?v=9ZExT...ature=youtu.be

Thank you guys for looking.

All I needed was a snapshot of evoscan when the problem is happening. I wouldn't beat on the car with something wrong like this.

log the o2 sensors, rpm, tps, isc counts, etc and just post a csv file as an attachment here. Just log it ideling for for a minute or so.

you're idle is very low with the chrome ecu

Looks like the front and rear o2 sensors are swapped on the jesters chip.

This sounds odd. I will PM you my number and we can try a couple things.

Quote:

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Originally Posted by HardProvidence

I've got a 1st gen Plug and Play ECU for my 91 stealth rt tt
My mods are intake and a down-pipe with no main cat and no front pre-cat.
I've wired the Flash ECU just like it says on chromedecu.org I've double checked all the wires and then checked them again few more times to make sure I've installed them correctly.

The car ran great with the flash ECU until she warmed up. Once warmed up the following happens:
-When starting from a stop I give it gas and engage the clutch, once I start to roll and my foot is off the clutch the car stutters and jerks as if its my first time driving a manual.
-Also sometimes it feels like there is no power even when I floor it, but once I floor it for a few sec eventually the power comes in.
-There is also a very loud knocking sound coming from the engine bay when I'm in neutral. The sound goes away when I push in the clutch pedal.

Only thing I've done to the ECU is disabled Periphery 2 bits 15, 14, 13, 11, 10, 9, 3 and 1.
I've also changed Periphery 0 Bit 2.
But no changes to how my car behaved.

I don't feel save driving around with these issues. I've put the stock ECU back in, and she runs like a champ, no issues what so ever.

I've asked about this on a local forum and they recommended me posting this thread on this site.

I'm still new to this and need some guidance, any input would be much appreciated.

Thank you for reading.
-Nick.

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Quote:

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Originally Posted by Greg E

Looks like the front and rear o2 sensors are swapped on the jesters chip.

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Hmmm, I doubt it but if it is we can just turn the jumpers.
@ Hard anyway give me a call we can get this fixed.

Quote:

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Originally Posted by Jesters Deadd

Hmmm, I doubt it but if it is we can just turn the jumpers.
@ Hard anyway give me a call we can get this fixed.

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Front and rear low trims are opposite maxed. What little I could make out from the log, the issue occurrs during closed loop. The brief times I could see the ECU in this mode, the sensors were opposite maxed and didn't move.

Makes me wish i have my extra ecu handy so we could meet up and do a quick hardware test.

Maybe Jester can swap you out for a new one?

Quote:

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Originally Posted by ChargerX3

Makes me wish i have my extra ecu handy so we could meet up and do a quick hardware test.

Maybe Jester can swap you out for a new one?

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Nah, very easy to fix. Just open up the case and flip a jumper.

Confirmed: disabling the front o2 sensor and setting closed loop to operate off just the rear vastly improved the way the car runs. Definitely a swapped o2 jumper.

Easy fix! :)

Thank you Greg for helping me out with this.

Quote:

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Originally Posted by Greg E

Nah, very easy to fix. Just open up the case and flip a jumper.

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There are warranty stickers on it. Wouldn't want to break them and loose the warranty if there is one.

Quote:

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Originally Posted by HardProvidence

Thank you Greg for helping me out with this.



There are warranty stickers on it. Wouldn't want to break them and loose the warranty if there is one.

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Why would you put a warranty sticker on a item that you expect the customer to open up in order to swap a jumper?

Quote:

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Originally Posted by 99 vr4

Why would you put a warranty sticker on a item that you expect the customer to open up in order to swap a jumper?

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Want a shovel? You can dig for dirt easier with it.

I don't get it..... And it is an honest question....

Quote:

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Originally Posted by HardProvidence

Thank you Greg for helping me out with this.



There are warranty stickers on it. Wouldn't want to break them and loose the warranty if there is one.

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Please give me a call, or pm me. All my ECUs have a two year warranty from date of purchase.
The 91-93 Plug and Play Ecu should never need to be opened to turn jumpers but the option is there if you wanted to have both banks trim off just one O2 or to easily switch the banks.
Anyway please give me a call I would like to get some details about your car.

I'm having the same knocking and low Idle as well but I have one of Adam's Clone ECU's. I adjusted the target Idle up and that seemed to fix the low idle but the knock is still there. Just changed all my fluids too and my SB Stage 4FE clutch has less than 10k on it. O2's are new too. I can try to disable the secondary O2 as well and see if it helps. Ill report back after lunch. :)

If your O2s are cycling then you have a different issue.

Quote:

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Originally Posted by Greg E

If your O2s are cycling then you have a different issue.

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O2's are cycling and the low and mid fuel trims are 0. Everything seems good but it still dies in the above situations. I have not set the Idle in SAS mode yet though just in the ECU.

Boost Leak?

Yep. Check for leaks.

I have the same transmission noise as the OP posted in his video.

Wondering did the ECU pin swap really fix that chattering issue or was it something else?

Asking cause I run a stock ECU but have that chatter and wondering if the OP was able to figure what was causing it.

Quote:

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Originally Posted by DrGonzo

I have the same transmission noise as the OP posted in his video.

Wondering did the ECU pin swap really fix that chattering issue or was it something else?

Asking cause I run a stock ECU but have that chatter and wondering if the OP was able to figure what was causing it.

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That chattering noise was the relay behind the dash. It clicks when your idle is too low. Absolutely nothing to do with the transmission.

Hey Greg, I'm referring to the video he posted.

clutch chatter 2 - YouTube

That is definitely not a relay causing that noise and he shows that when the clutch is dis-engaged the noise goes away. Same issue I have. I have replaced input shaft bearing and end-case bearings and still the noise is there. Thinking now it is the stock clutch making the noise but don't want to swap a clutch to find out it was not the issue. I need to figure it out as part swapping guessing what the issue is starts getting expense!!

I talked Hard and he was having clutch issues. Apparenty slipping.

Quote:

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Originally Posted by DrGonzo

Hey Greg, I'm referring to the video he posted.

clutch chatter 2 - YouTube

That is definitely not a relay causing that noise and he shows that when the clutch is dis-engaged the noise goes away. Same issue I have. I have replaced input shaft bearing and end-case bearings and still the noise is there. Thinking now it is the stock clutch making the noise but don't want to swap a clutch to find out it was not the issue. I need to figure it out as part swapping guessing what the issue is starts getting expense!!

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Weird my transmission does that too.
its not the flash ECUs though.
Probably in the tranny.