347 stumbling under hard acceleration

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Re: 347 stumbling under hard acceleration

Unread postby kf4mms » Fri Mar 16, 2018 6:57 pm

Took 25% out and will take out another 8% tomorrow.
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Re: 347 stumbling under hard acceleration

Unread postby kf4mms » Sun Mar 18, 2018 1:32 pm

The car did not like the extra 8% being removed, so I put it back in. It was laying down at around 60mph.
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Re: 347 stumbling under hard acceleration

Unread postby decipha » Sun Mar 18, 2018 2:41 pm

beating on your car with the tune out of wack is a surefire way to blow the engine
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Re: 347 stumbling under hard acceleration

Unread postby kf4mms » Sun Mar 18, 2018 3:23 pm

I am a little confused on whether the issue is my tune or a mechanical issue. Starting to question my fuel pump or distributor.
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Re: 347 stumbling under hard acceleration

Unread postby kf4mms » Wed Mar 21, 2018 7:38 pm

The best it has ran is when I first took that 25% out. I saved that tune (just in case). Currently, the Mustang is at my Dad's which is about 30 miles from my house. So, it may be the weekend before I will get an opportunity to mess with it any more. I am going to push that last good tune to it and leave it until I have time to closely follow the write ups or just pay to have it tuned. I am a Networking Engineer by day (and most nights) and I really don't have much time to myself or family these days. I am not really interested in becoming a full time tuner, I just want my car to run well. Maybe it is less time consuming and less expensive just to have it tuned?
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Re: 347 stumbling under hard acceleration

Unread postby decipha » Wed Mar 21, 2018 10:23 pm

yea tuning take a lot of time to fully understand everything and get it situated, prob best if you do get a tune rather than blowing it up

however if theres something mechanical amiss tuning wont fix that lol
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Re: 347 stumbling under hard acceleration

Unread postby kf4mms » Thu Mar 22, 2018 12:56 am

From my previous descriptions of my issues, would you say it is more likely a mechanical issue or the tune?
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Re: 347 stumbling under hard acceleration

Unread postby decipha » Thu Mar 22, 2018 7:46 am

impossible to tell not enough info

if it was rich before it would seem its not running out of fuel so most likely just needs to be dialed in
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Re: 347 stumbling under hard acceleration

Unread postby kf4mms » Sat Mar 31, 2018 2:32 pm

Had a long weekend this weekend and had time to mess with the stang. I just repushed the tune and it is back to running better. It does buck a little but otherwise driveable. I found a bad plug wire that was burnt on the exhaust manifold on the passenger side. i replaced all wires and spark plugs today.

Attached are 3 logs hat I took. One is just cranking and driving short distance. 2 is a little longer driving. 3 is a medium driving distance in various kinds of traffic and conditions.

Can someone please review these logs and let me know what my next steps should be?

Thanks,
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Re: 347 stumbling under hard acceleration

Unread postby decipha » Sat Mar 31, 2018 7:21 pm

did u dial in fuel yet?
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Re: 347 stumbling under hard acceleration

Unread postby kf4mms » Sat Mar 31, 2018 7:45 pm

It has only the 25% reduction thus far. I tried taking another 8% but it did not respond well and started running rough. I noticed during driving that Kamrf1 was at 1, Kamrf was at 1, Lambse1 and Lambse2 were at 1. Fuel error was also at 1. I did do a couple of WOT's and the car did better but I noticed that Lambse 1 and 2 dropped to .875. Kamrf1 and Kamrf2 stayed at 1 but fuel error jumped to 1.125.
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Re: 347 stumbling under hard acceleration

Unread postby decipha » Sat Mar 31, 2018 8:37 pm

yea ita showing the enrichment, the fuel error is based on the hegos since its stuck in open loop it cant calculate the fuel error

its very stupid to go wot without your fuel being dialed in thats a perfect way to blow the engine or at the very least hurt it

you have to get it in to closed loop to have the hegos calculate the fuel error
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Re: 347 stumbling under hard acceleration

Unread postby kf4mms » Sun Apr 01, 2018 6:49 am

I have a Dakota Digital fan controller and electric fan. The Fan controller is set to come on at 180 degrees. Could this make it show enrichment if it is not up to temp? Should I adjust them temp?
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Re: 347 stumbling under hard acceleration

Unread postby decipha » Sun Apr 01, 2018 11:19 am

no
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Re: 347 stumbling under hard acceleration

Unread postby kf4mms » Tue Apr 03, 2018 12:35 pm

I had initially thought that O2's would go into closed loop based on temp. I see that is incorrect and it actually uses time. How much should I reduce the MAF to get it to stop enrichment?
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Re: 347 stumbling under hard acceleration

Unread postby SlowBox » Tue Apr 03, 2018 12:40 pm

The startup fuel table controls enrichment. The A9L2 has the ecu going into closed loop fairly soon so it may not be best to play with those settings and instead just wait for it to do it itself while the car warms up.
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Re: 347 stumbling under hard acceleration

Unread postby kf4mms » Tue Apr 03, 2018 1:24 pm

Thanks Slowbox. The best the car has ran yet is with the tune you corrected for me. I guess it is still a little rich but not sure how much.
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Re: 347 stumbling under hard acceleration

Unread postby SlowBox » Tue Apr 03, 2018 1:51 pm

Do like Decipha recommended and let it warm up and drop into closed loop. Don't beat on it, just drive it around for a little while and let kams trim the fuel to where it needs to be. Keep an eye on your laptop and make adjustments while you're test driving it if you're able.
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Re: 347 stumbling under hard acceleration

Unread postby kf4mms » Tue Apr 03, 2018 2:20 pm

Roger that. I drove it around probably 10-12 miles. Maybe that wasn't enough. I will drive it a little further next time.
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Re: 347 stumbling under hard acceleration

Unread postby SlowBox » Tue Apr 03, 2018 2:34 pm

It's not getting into closed loop after a drive that long?
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Re: 347 stumbling under hard acceleration

Unread postby kf4mms » Tue Apr 03, 2018 2:49 pm

I am really not sure. Is doesn't show me on the digital dashboard. Is there another way to tell?
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Re: 347 stumbling under hard acceleration

Unread postby decipha » Tue Apr 03, 2018 2:59 pm

yeah you'll see the lambse's jumping up and down
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Re: 347 stumbling under hard acceleration

Unread postby kf4mms » Tue Apr 03, 2018 4:18 pm

I looked thru my logs and the Lambses are jumping around some but then they would go back to 1 then a short while later they would start jumping around again briefly then go to 1 again.
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Re: 347 stumbling under hard acceleration

Unread postby kf4mms » Sat Apr 07, 2018 11:05 am

Should I put the other O2 back in and remove the wideband? Back at it again today for a short while.
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Re: 347 stumbling under hard acceleration

Unread postby decipha » Sat Apr 07, 2018 4:02 pm

no i wouldnt

if u have the wideband just dial in your fuel
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Re: 347 stumbling under hard acceleration

Unread postby kf4mms » Sun Apr 08, 2018 6:06 pm

So, Lamda always equals 1? If I am doing this correctly my Lamda is 1, Lambse is .60 (WBO2 reading) and KAMRF is 1.059 for a fuel error of 1.091 at 2 volts MAFV. Do I multiply the the voltages in MAF Transfer or divide? My thinking is to divide since it is still enriched. Is that correct?
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Re: 347 stumbling under hard acceleration

Unread postby decipha » Sun Apr 08, 2018 10:55 pm

no lambda is the wideband unless your in closed loop and the hego is controlling the lambda which can only then be 1 as the hegos only switch at stoich == lambda of 1

if the wideband is reading .6 then that is your lambda

if lambse is 1 and kamrf is 1.05 then

from the fuel write up

LAMBDA - LAMBSE + KAMRF = Error %

thus

0.6 - 1 + 1.05 == 0.65

go multiply the flow at that mafv by 0.65 to reduce it 35% and lean it out and the wideband should then report 1.000
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Re: 347 stumbling under hard acceleration

Unread postby kf4mms » Mon Apr 09, 2018 9:27 am

Thanks, Decipha!!
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Re: 347 stumbling under hard acceleration

Unread postby kf4mms » Sun Apr 15, 2018 6:49 am

I multiplied the MAFV value at 2volts by .65 for the reduced value. When I gave the car some throttle up to MAFV of 2 volts, it started busting up like it was going to shut off but when I gave it some more throttle (above 2 volts MAFV) it straightened out. Could I be missing something?
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Re: 347 stumbling under hard acceleration

Unread postby Paulie » Sun Apr 15, 2018 12:03 pm

kf4mms wrote:I multiplied the MAFV value at 2volts by .65 for the reduced value. When I gave the car some throttle up to MAFV of 2 volts, it started busting up like it was going to shut off but when I gave it some more throttle (above 2 volts MAFV) it straightened out. Could I be missing something?

If you only multiplied one point of the MAF transfer function by .65 is that point now lower than the than the one before it? Airflow has to increase with voltage. You cannot have an airflow value lower than the one at the next lower voltage. Also the MAF transfer function should be a smooth curve. If it is jagged something else is wrong.
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