^^ Try disconnecting your battery and pressing the brake to bleed off all the juice... that MAY get your ECU so you can flash again. Worked for me the one time it happened.

BTW, you will have to take a ton off your cranking enrichment. For 600's I'm single digits on the bottom and it's still not perfect.

 

ECU reset worked (battery disconnected) thanks to Jared @ UpRev and djamps! I took fuel out of the entire enrichment map (per your recommendation) and car starts MUCH better now both in cold and hot....maybe I can get these 750's dialed in after all eh?

1 issue is throttle tip in still goes pig rich (a/f read 10:1 after stabbing the throttle pedal, so it's probably richer than that!). Is adjusting the MAF word data values the preferred method of fixing tip-in a/f?

Does anyone know if and how these rear 2 oxygen sensors being welded outside the exhaust stream will affect tuning with UpRev?:

 

Having the lower sensors out of the stream is usually to prevent catalyst CEL (harmless codes which can simply be deleted with Uprev). So if possible, put them back in the exhaust stream and just turn off the P04x0 codes.

Unfortunately I've found through experience and testing on my own car that keeping them out of the exhaust flow WILL affect idle and cruising trims. What you'll find is that the long term trims will wander off and eventually cause a rich cruise and A/F bounce at idle that you cannot correct in the fuel tables. It won't affect your WOT A/F or peak power though.

If you don't mind a few less MPG and keep an eye on your trims so it doesn't go stupid rich (I saw about 12-13 a/f at times instead of 14.7) then it's probably no big deal.

Unfortunately I'm running cats so I have to keep the A/F around 14.7 at cruise so antifoulers are out of the question -- custom 3" cats welded into my downpipes isn't a cheap fix haha. With no cats cruising at 12-13 A/F at times won't hurt anything except the MPG.

 

Perfect, just what I needed to know!

Given that O2 Sensor 1 Bank 1 (Passenger-side pre-cat, right?) is pegged at 0.28-0.29 volts, do you think I'd be okay just replacing that passenger side pre-cat O2 sensor with the ~$55 bosch replacement O2 sensor? I don't think my friend has the budget to put those post-cat 02 sensors back into the exhaust stream for now. I was thinking of buying this 02 sensor:

PART#: BS15730 MFR#: 15730
http://www.partstrain.com/store/?PN=...ytic+Converter

 

Update: The car is running ridiculously rich and it went through a full tank of gasoline during idle according to the tech's report . Also, now the car's starter will not crank over the engine even though we have an extra 12v source giving the battery perfect juice.. It's like the car has gone from bad to worse. Most recent log is attached.

The following was added to the car:

1. Fixed vacuum leaks
2. Cleaned MAF with brake cleaner (had red methanol residue from the previous owner)
3. 550cc RC Engineering Injectors (high impedance, replaced 750cc's)
4. Changed tuning parameters to the following:

* Fuel Trim table set to 100% across the board *
* A/F target and Ignition tables left @ stock settings to try to at least get stable idle from the car *
* Idle was left at the 800rpm raised-level from previous 750cc injectors *







When I first started the car with 550cc injectors, it was responding to changes in K Fuel Multiplier values. The 750cc injectors also responded to changes in K fuel values. Now, it won't respond much to K Fuel Multiplier changes, fuel trim, or a/f target...just keeps running extremely rich. Although, when I set K Fuel Multiplier to 0, engine died as it should.

What am I doing wrong or what do you experienced UpRev users think is the problem? I'm outa ideas..and hair on my head .

 

If K doesn't respond your injector latencies are wrong. This happened when I upgraded from 440 to 600cc. I had to increase or decrease the msec at 14v by a couple tenths (can't remember which, probably decrease though). Also take a look at the injector minimum -- if it's too high you will have the same problem.

Those injector values seem low... stock is about 1.1ms at 14V... my 600cc's are 1.3ms injector minimum is set to 1.5ms

Make sure you run the updater and have the latest rom editor.. significant changes have happened in the past month or two in the injector latency setting accuracy.

Lastly, if you dumped that much fuel into the engine theres a chance you may have hydrolocked... pull the plugs and crank the fuel out...

 

Thanks for your input DJamps .

The tech reported the motor is not hydrolocked, so after he puts a new starter in (because it won't turn), I'll try new injector latencies. The UpRev CD that came with the cable has an original (aka "stock") ecu rom file that has the following values:



I updated all the UPrev software last night too, so Rom Editor version changed from 1.0.4128.24910 to 1.0.4154.25117. Uprev informed me they usually don't change injector latencies unless the injector size is 800cc+, so I'll try the above stock latencies for these RCEng 550cc injectors and see if it idles better...any luck or voodoo magic finger-crossing would be appreciated from this community..

 

Definitely going to want to lower the injector minimum.

I also noted that I could still pull fuel on the comp table even when the K wouldn't work, so keep that in mind too.

 

The Techs said it's dumping so much fuel during cranking that when they pulled a spark plug, it was shooting fuel out the hole . The engine isn't turning over with this new oem stock latency setting, so I'm pulling cranking enrichment down to here:



DJ, do you mind me asking what your cranking enrichment table looks like along with your injector latency values?

 

That's what I said on page one to do with cranking enrichment. Here is my old cranking enrichment table and injector scale for my Dw 600cc's.

My cranking enrichment with my Dw 600cc injectors.


injector latency values with my Dw 600cc injectors.

 

^^ those latencies are wrong... unless you're running an older version of ROM editor which required half the 'actual' value. 14v latency is around 1.3ms on DW 440-800 injectors.

 

Those values are From Sam @ GTM. So your saying he is wrong? Never the less these are the values in my ROM from GTM I was using with no AFR issues.

Rom editor File ver: 1.0.4161.26605

 

If it's an older version of ROM editor then it may be close enough. Newer versions require more realistic values. The ones in yours are about half what my flow sheet from DW specify. Either way, you can tune around it for the most part... I ran with stock latencies for almost a year.

 

The help from all of you in this community is awesome . Those who've datalogged using Uprev's Cipher with the key in the ignition ON position, before cranking the motor, is the software showing any amount of pulsewidth from Bank 1 and Bank 2 of the injectors and BTDC ignition timing value above 0?

 

Hey guys,

is there any harm in disconnecting the front 2 02 narrowband sensors and performing a full tune at all load ranges? (Appropriate DTC codes would be disabled of course). I'm asking because I'm not sure how (or IF) this will affect the tune over time in the long run. Our passenger side Sensor 1 Bank 1 02 sensor is giving us a weird reading even after swapping the 02 sensors (constantly 0.22-0.23). When we unplugged both 02 sensors, car seems to run better..

 

It will be difficult to tune without the lower O2's sending a proper signal -- just using non-foulers made part throttle tuning near impossible. I've never tried completely disconnecting them though, so I don't know what would happen in that case. Let us know how it turns out.

 

subscribed. Good stuff, guys.

 

Can anyone answer about the use of the A/F target Table for an 03 without factory widebands?

 

It 'estimates' on the actual A/F based on narrowband input over time. It works but it's much slower and a less accurate. I would definitely NOT recommend disconnecting any of them and fix whatever issues you're having with their signals.

And looks like the injector minimum for the RC550's should be around 1.0 (for the guy who posted the chart)