Lean under WOT
Melting Slicks
Joined: Nov 2013
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From: USA
Melting Slicks
Joined: Mar 2018
Posts: 2,502
Likes: 187
From: California
I can’t really remember a clip being on the original sensor when I pulled mine out it was a simple install though just un hook the old one install your grommet and plug in the new one . If you could save the clip
would be advised just to see if it will fit your new one . Be sure to make sure all tubes , seals ect are nice and tight after don’t wanna be going back to ripping off intakes . I been there had my tear off down to 15 minutes lol
would be advised just to see if it will fit your new one . Be sure to make sure all tubes , seals ect are nice and tight after don’t wanna be going back to ripping off intakes . I been there had my tear off down to 15 minutes lol
Last edited by Speedy007; Jan 17, 2025 at 10:37 AM.
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Melting Slicks
Joined: Mar 2018
Posts: 2,502
Likes: 187
From: California
Wiring issue is most likely the cause possible many easy to test that . Possible faulty sensor
I want to ask if the car showing a p0102 or 03 because if its done right it should be maf should be disabled
I want to ask if the car showing a p0102 or 03 because if its done right it should be maf should be disabled
Last edited by Speedy007; Jan 17, 2025 at 09:24 PM.
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Yes its 03 with maf plugged in or 02 w/o it plugged in. It gives me the right values when i go to crank the car. 1 bar then down to 50-60 when engine comes on. would that still be wiring issue?
Melting Slicks
Joined: Mar 2018
Posts: 2,502
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From: California
dunno about that . I’ve always used a hpt to spot my map . Have your driven the car any difference?
Melting Slicks
Joined: Nov 2013
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From: USA
1 bar when cranking down to 50-60 kpa idling is 100% normal and accurate. Post a log of all of this and can confirm it's good now.
Before it was at 100 kpa idling, this is a big change.
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Last edited by Blayn; Jan 19, 2025 at 04:12 AM.
Melting Slicks
Joined: Nov 2013
Posts: 2,049
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From: USA
There's still very little data to go off in the log.... logging way too many things for these old PCMs, the logging rate is horrid. The engine speed param updates twice in a "pull". Plus no overlay of wideband and stuff makes it hard to really see.
But yes, with even a very minimal amount of boost, just barely above atm pressure the injector duty is super high and you say its still running lean. To me it looks like it's commanding way more fuel than it should possibly need for the conditions, but I can't really say.
Are the injectors legit and actually 80lbs?
I would def start with verifying fuel pressure. When I was boosted, I wired fuel pressure sensor into the EGR pin so I could monitor and log it.
But yes, with even a very minimal amount of boost, just barely above atm pressure the injector duty is super high and you say its still running lean. To me it looks like it's commanding way more fuel than it should possibly need for the conditions, but I can't really say.
Are the injectors legit and actually 80lbs?
I would def start with verifying fuel pressure. When I was boosted, I wired fuel pressure sensor into the EGR pin so I could monitor and log it.
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There's still very little data to go off in the log.... logging way too many things for these old PCMs, the logging rate is horrid. The engine speed param updates twice in a "pull". Plus no overlay of wideband and stuff makes it hard to really see.
But yes, with even a very minimal amount of boost, just barely above atm pressure the injector duty is super high and you say its still running lean. To me it looks like it's commanding way more fuel than it should possibly need for the conditions, but I can't really say.
Are the injectors legit and actually 80lbs?
I would def start with verifying fuel pressure. When I was boosted, I wired fuel pressure sensor into the EGR pin so I could monitor and log it.
But yes, with even a very minimal amount of boost, just barely above atm pressure the injector duty is super high and you say its still running lean. To me it looks like it's commanding way more fuel than it should possibly need for the conditions, but I can't really say.
Are the injectors legit and actually 80lbs?
I would def start with verifying fuel pressure. When I was boosted, I wired fuel pressure sensor into the EGR pin so I could monitor and log it.
The stuff being logged is not in my control, thats the channels the tuner had me load and i’m not sure if i can make it update faster. If i can please let me know how. when it pops and back fires wideband fluctuates very rapidly around 17-20 and when i let off it instantly drops down to 10-11 AFR and occasionally will spike to 20 for like half a second when it pops. I have video of the wideband I attached.
Melting Slicks
Joined: Nov 2013
Posts: 2,049
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From: USA
Speculating... it's running super rich and thats why its misfiring. When it misfires it will temporality read super lean in spikes.
Does this thing not have narrowband sensors still? I would run closed loop and make things easier on yourself.
Spark plugs could be fouled after running so rich, check/replace as you go.
Does this thing not have narrowband sensors still? I would run closed loop and make things easier on yourself.
Spark plugs could be fouled after running so rich, check/replace as you go.
Le Mans Master
Joined: Jul 2010
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Speculating... it's running super rich and thats why its misfiring. When it misfires it will temporality read super lean in spikes.
Does this thing not have narrowband sensors still? I would run closed loop and make things easier on yourself.
Spark plugs could be fouled after running so rich, check/replace as you go.
Does this thing not have narrowband sensors still? I would run closed loop and make things easier on yourself.
Spark plugs could be fouled after running so rich, check/replace as you go.
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Intermediate
Joined: Dec 2024
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Speculating... it's running super rich and thats why its misfiring. When it misfires it will temporality read super lean in spikes.
Does this thing not have narrowband sensors still? I would run closed loop and make things easier on yourself.
Spark plugs could be fouled after running so rich, check/replace as you go.
Does this thing not have narrowband sensors still? I would run closed loop and make things easier on yourself.
Spark plugs could be fouled after running so rich, check/replace as you go.
The only other thing I can think of to cause this is the fuel pressure regulator. I think when it’s calling for so much fuel the regulator isn’t regulating it and it’s spiking up a lot and causing it to run extremely rich. I believe this is my problem mainly because i’m still relying on the factory regulator on the rail. I’m going to order one but do I need non stock rails for me to put it on or can I put it inline the feed fuel line and still have the return line the same?
It’s sounding like gunshots now when it pops and is working exactly like antilag. Spools the turbo fast. Also shooting visible flames.
Melting Slicks
Joined: Nov 2013
Posts: 2,049
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From: USA
The biggest lesson to be learned here is properly wire up needed sensors before you try to tune something. Fuel pressure and especially wideband for this one. Plus who knows whatever else hardware issues going on.
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Definitely agree, fuel pressure sensor on log and wideband on log would be extremely helpful.
Thread Starter
Intermediate
Joined: Dec 2024
Posts: 26
Likes: 3
Speculating... it's running super rich and thats why its misfiring. When it misfires it will temporality read super lean in spikes.
Does this thing not have narrowband sensors still? I would run closed loop and make things easier on yourself.
Spark plugs could be fouled after running so rich, check/replace as you go.
Does this thing not have narrowband sensors still? I would run closed loop and make things easier on yourself.
Spark plugs could be fouled after running so rich, check/replace as you go.
Bank 1
B1
Bank 2
B2
B2
Le Mans Master
Joined: Jul 2010
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