All of this because of a converter install??
All of this because of a converter install?? Well I installed my 3rd Fuddle converter last week and still getting ses codes. I barrowed a buddies scan tool and this is what showed up from the freeze data:
DTC that caused the freeze data=PO300
Throttle position=0.0%
Load value=3.9%
RPM=885
Air flow rate=10.21 GR/SEC
Map sensor=35 KPA
Coolant temp=82º
STFT#1=0.0%
LTFT#1=2.3%
STFT#2=0.0%
LTFT#2=1.5%
STFT#3=50.0%
LTFT#3=-18.8%
STFT#4=57.0%
LTFT#4=-3.4%
Vehicle speed=1 MPH
Fuel system=#1 & #2 open
All of this happened after I installed the Fuddle converter. I'm not saying that it is the converter, but if it's the tune, this ses thing just happened by coincidence after installation??? I started the truck and drove it for awhile and to check fluid levels and ses codes ever since.
What is ya'lls analogy???
James
DTC that caused the freeze data=PO300
Throttle position=0.0%
Load value=3.9%
RPM=885
Air flow rate=10.21 GR/SEC
Map sensor=35 KPA
Coolant temp=82º
STFT#1=0.0%
LTFT#1=2.3%
STFT#2=0.0%
LTFT#2=1.5%
STFT#3=50.0%
LTFT#3=-18.8%
STFT#4=57.0%
LTFT#4=-3.4%
Vehicle speed=1 MPH
Fuel system=#1 & #2 open
All of this happened after I installed the Fuddle converter. I'm not saying that it is the converter, but if it's the tune, this ses thing just happened by coincidence after installation??? I started the truck and drove it for awhile and to check fluid levels and ses codes ever since.
What is ya'lls analogy???
James
Originally Posted by Brent@EPP
go to a dealership or a shop and have them perform a crank position variation relearn it should clear it all up
Thanks for your help!!
James
You just have to raise the values in the missfire low rpm tables to a higher value, try 50%. that should fix that issue, if the code still comes back then raise it more untill it quites. That or just max out that whole table and forget about it...
Originally Posted by wait4me
You just have to raise the values in the missfire low rpm tables to a higher value, try 50%. that should fix that issue, if the code still comes back then raise it more untill it quites. That or just max out that whole table and forget about it...
James
Originally Posted by closet red neck
Well I installed my 3rd Fuddle converter last week and still getting ses codes. I barrowed a buddies scan tool and this is what showed up from the freeze data:
DTC that caused the freeze data=PO300
Throttle position=0.0%
Load value=3.9%
RPM=885
Air flow rate=10.21 GR/SEC
Map sensor=35 KPA
Coolant temp=82º
STFT#1=0.0%
LTFT#1=2.3%
STFT#2=0.0%
LTFT#2=1.5%
STFT#3=50.0%
LTFT#3=-18.8%
STFT#4=57.0%
LTFT#4=-3.4%
Vehicle speed=1 MPH
Fuel system=#1 & #2 open
All of this happened after I installed the Fuddle converter. I'm not saying that it is the converter, but if it's the tune, this ses thing just happened by coincidence after installation??? I started the truck and drove it for awhile and to check fluid levels and ses codes ever since.
What is ya'lls analogy???
James
DTC that caused the freeze data=PO300
Throttle position=0.0%
Load value=3.9%
RPM=885
Air flow rate=10.21 GR/SEC
Map sensor=35 KPA
Coolant temp=82º
STFT#1=0.0%
LTFT#1=2.3%
STFT#2=0.0%
LTFT#2=1.5%
STFT#3=50.0%
LTFT#3=-18.8%
STFT#4=57.0%
LTFT#4=-3.4%
Vehicle speed=1 MPH
Fuel system=#1 & #2 open
All of this happened after I installed the Fuddle converter. I'm not saying that it is the converter, but if it's the tune, this ses thing just happened by coincidence after installation??? I started the truck and drove it for awhile and to check fluid levels and ses codes ever since.
What is ya'lls analogy???
James
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Originally Posted by Doc
My prognosis is that the lighter weight converter is causing the DTC P0300 which as Jesse already said can be fixed by upping the threshold for missfires. For a truck with just bolt ons I don't know why your fuel trims are so out of whack. Was this a mail order tune or did you get air/fuel in person? Looks like there is some *** left on the table if you can get your a/f worked out. Either that or a massive header/exhaust leak.
James
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Originally Posted by wait4me
You just have to raise the values in the missfire low rpm tables to a higher value, try 50%. that should fix that issue, if the code still comes back then raise it more untill it quites. That or just max out that whole table and forget about it...
James
FormerVendor
Joined: Mar 2006
Posts: 1,540
Likes: 0
From: Hell AFB
Do what brent said. Also, check all plugs, wires , try swapping coil packs from side to side. Log data so you can see which cylinders are misfiring. If you can point it out then you can narrow the possibilities.
The scanner data you posted about long term fuel trim 3 & 4 (LTFT) were
-18 and -3.4% which means your fuel trims are having to remove fuel(you are running rich). The collective wisdom I have always gone by is/was a properly tuned vehicle that is running a MAF and fuel trims should have no more than +/-2% with a preference of having the trims slightly negative or needing to add fuel. These LSx based vehicles are extremely tolerant meaning they will still run with up to 25% fueling errors. They won't run efficiently or take advantage of their power potential but they will run. To get the full benefit of you bolt-ons and converter as stated before I would in laymans terms desensitize your missfire threshold tables so the lighter converter won't set that code and then I would put your truck in Open Loop Speed Density(turn off your MAF and fuel trims) and redo your basic fueling (VE) tables then turn everything back on and rescale your MAF tables all with a wideband O2 sensor and EFI Live. If you are not getting this type of service with your tune I would expect a explanation from your tuner as to why your fuel trims are so far off.
-18 and -3.4% which means your fuel trims are having to remove fuel(you are running rich). The collective wisdom I have always gone by is/was a properly tuned vehicle that is running a MAF and fuel trims should have no more than +/-2% with a preference of having the trims slightly negative or needing to add fuel. These LSx based vehicles are extremely tolerant meaning they will still run with up to 25% fueling errors. They won't run efficiently or take advantage of their power potential but they will run. To get the full benefit of you bolt-ons and converter as stated before I would in laymans terms desensitize your missfire threshold tables so the lighter converter won't set that code and then I would put your truck in Open Loop Speed Density(turn off your MAF and fuel trims) and redo your basic fueling (VE) tables then turn everything back on and rescale your MAF tables all with a wideband O2 sensor and EFI Live. If you are not getting this type of service with your tune I would expect a explanation from your tuner as to why your fuel trims are so far off.
TECH Senior Member
Joined: Apr 2002
Posts: 6,080
Likes: 17
From: So.Cal.
Originally Posted by Jake@EPP
Do what brent said. Also, check all plugs, wires , try swapping coil packs from side to side. Log data so you can see which cylinders are misfiring. If you can point it out then you can narrow the possibilities.
Originally Posted by Doc
The scanner data you posted about long term fuel trim 3 & 4 (LTFT) were
-18 and -3.4% which means your fuel trims are having to remove fuel(you are running rich). The collective wisdom I have always gone by is/was a properly tuned vehicle that is running a MAF and fuel trims should have no more than +/-2% with a preference of having the trims slightly negative or needing to add fuel. These LSx based vehicles are extremely tolerant meaning they will still run with up to 25% fueling errors. They won't run efficiently or take advantage of their power potential but they will run. To get the full benefit of you bolt-ons and converter as stated before I would in laymans terms desensitize your missfire threshold tables so the lighter converter won't set that code and then I would put your truck in Open Loop Speed Density(turn off your MAF and fuel trims) and redo your basic fueling (VE) tables then turn everything back on and rescale your MAF tables all with a wideband O2 sensor and EFI Live. If you are not getting this type of service with your tune I would expect a explanation from your tuner as to why your fuel trims are so far off.
-18 and -3.4% which means your fuel trims are having to remove fuel(you are running rich). The collective wisdom I have always gone by is/was a properly tuned vehicle that is running a MAF and fuel trims should have no more than +/-2% with a preference of having the trims slightly negative or needing to add fuel. These LSx based vehicles are extremely tolerant meaning they will still run with up to 25% fueling errors. They won't run efficiently or take advantage of their power potential but they will run. To get the full benefit of you bolt-ons and converter as stated before I would in laymans terms desensitize your missfire threshold tables so the lighter converter won't set that code and then I would put your truck in Open Loop Speed Density(turn off your MAF and fuel trims) and redo your basic fueling (VE) tables then turn everything back on and rescale your MAF tables all with a wideband O2 sensor and EFI Live. If you are not getting this type of service with your tune I would expect a explanation from your tuner as to why your fuel trims are so far off.
James
Originally Posted by joecar
Yes, I agree... stall converter is smaller/lighter so CASE relearn is needed so PCM can correctly determine misfires; do this first and then check for real misfires [due to plugs, wires, etc...].
James
FormerVendor
Joined: Aug 2005
Posts: 531
Likes: 0
From: Decatur IN.
yeah it is a simple procedure with a tech II it should only take a few minutes and he should be able to point out wich cylinder(s) are missing, It is unlikely that the audible misfire is the fault of the convertor,but when you change the recipricating weight of the crankshaft you change the corelation it will read this as a misfire though it is false it will run the SES light.If your miss is audible or truly there a tech II will tell you wich cylinder(s) it happening on. Hopefully its just a fouled plug or something silly If it smells pig rich at idle this could be your dilema good luck!
The converter wouldn't bother the crank position any. What is does,
is magnify (or rather, take away the mass that used to damp) the
crank ripple. Crank timing jitter is what misfire detection looks for.
CASE learn should happen automagically. You can force it with the
TechII or some of the aftermarket tuning tools. Sometimes crank
learn will be inhibited by existing emissions faults, but you should
see a code for that if so.
My car has had an idle miss from day one. I believe this is just
the proportional fuel swinging from too rich to too lean, like
programmed from the factory. A lighter flywheel mass will let
this show more plainly as well.
is magnify (or rather, take away the mass that used to damp) the
crank ripple. Crank timing jitter is what misfire detection looks for.
CASE learn should happen automagically. You can force it with the
TechII or some of the aftermarket tuning tools. Sometimes crank
learn will be inhibited by existing emissions faults, but you should
see a code for that if so.
My car has had an idle miss from day one. I believe this is just
the proportional fuel swinging from too rich to too lean, like
programmed from the factory. A lighter flywheel mass will let
this show more plainly as well.
Originally Posted by Brent@EPP
go to a dealership or a shop and have them perform a crank position variation relearn it should clear it all up
I have noticed that when the truck is very cold(50º @ night), it won't run. I can't start it just by starting it. I have to stat the truck like an old school engine. I tried starting it like normal(not having to hit the gas while starting) and it died twice. Then I had to start it while giving it gas at the same time. I'm going to crawl under it tomorrow and see if I left something unplugged. I'm going to ghange injectors, fuel regulator, plugs and check for vaccum leaks again and if I don't find something wrong, I'm just going to do the cam, lifter, push rod, timing chain, heads and new tune. I'm just rinning out of options here. Just for the record, my truck has 20,800 original miles on it.James
