Ok so I figured this has to be in the electric area because I'm stumped and replaced some fuel parts. Car is a stock turbo all bolt ons meth and cams ported intake and tb untouched turbo/mani/02 and an safc.
Car is going lean and just randomly did one day for some odd reason when I took my old dtec off. Afrs in the 13s-14s. I have a s1 pcm and s2 injectors. s2's are plenty of fuel for my car but it went lean. Swapped in a friend's 750s and that felt good until about 4500 or so the car was going 10.0 afrs with only 10% of fuel pulled across the board on the safc and it just jumped up back to ~14.0 afrs at 4500 rpms. This is all at 14psi stock turbo.
I swapped my walbro 255 for a stage 3 one thinking it could have failed. that didn't fix it. swapped fprs, that didn't fix it. I swapped mostly everything in the fuel system and and it didn't fix it so I'm thinking it has to be related to the safc (even though it was going lean before I installed it) or the pcm or something happened between the time I took the dtec off and put the safc on.
Can anyone help me?
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Last edited by siberian57 : 06-04-2008 at 07:54 PM.
a friend was driving it just now and he said it would sputter and then go rich then lean and bounce back and forth but would stay lean most of the time and then sputter again and he said the car gave him a p0108 high map sensor cel and died. He reset the pcm with a drb and it started up again.
I was told that when you add fuel to a dtec it does this and that an safc might be the same way, so that could be the reason for the code. but it still leaves me clueless on the other problem of the car being lean at 14psi with plenty of fuel in the functioning s2 injectors, new fpr and new pump, safc settings zero'd on the stock turbo.
Don't know if that helps but thats what just happened right now. I also replaced the stock map sensor with another one, because I was told the problem could be in there once. Replaced it, no difference. It has the be the wiring or the pcm or something I'd think
Last edited by siberian57 : 06-05-2008 at 11:06 AM.
maybe your upper 02 senser , have you checked that ?
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maybe your upper 02 senser , have you checked that ?
nope haven't checked that. It's weird because when I swapped the 750s in I had to pull 10% across the board to get it to idle right and it felt REALLY good at the same boost level (14psi) and it showed 10.0 afrs up until 4500. It still went lean after 4500 but felt real good. Swapped the s2's back in and it didn't feel nearly as good but was still going lean either way and the s2's are plenty of fuel for my setup the 750s was overkill just to see if the injectors were the problem. I can check it though.
I mean the car sputtered and died and threw that high map voltage CEL or something for who knows what reason
boost is higher than you think thanks to a faulty gauge perhaps...
It's possible. I mean if I used the DRB to check the boost the pcm is seeing anyway, I'm sure that would be off as well seeing as I have the safc on intercepting that signal. Although we did adjust the boost quite a few turns on my wga and it only seemed to go like 1psi more and we were getting pretty high on the wga adjustment.
could loose wiring in the install cause this? Or does this sound too weird to be that. Because I might just go over everything and solder all the wires. But if the pcm is bad then it might be a waste to even bother.
Although I still don't get the injector thing and why they felt different at the same boost if they both provide plenty of fuel yet both went lean. Idk I'm just talking out loud at this point. I am fresh out of ideas
could loose wiring in the install cause this? Or does this sound too weird to be that. Because I might just go over everything and solder all the wires. But if the pcm is bad then it might be a waste to even bother.
Although I still don't get the injector thing and why they felt different at the same boost if they both provide plenty of fuel yet both went lean. Idk I'm just talking out loud at this point. I am fresh out of ideas
I threw that code when I wired in my safc for the first time. I found a bad ground on my safc that was causing the problem. I know you said you just took yours out, but it still could be a wiring issue. After all it is the last thing you did to the car. Get the soldering gun out and double check all the connections.
well see this problem started happening the day I removed the dtec and has been going on ever since. the safc came into the picture 2 months later, but is what I currently have on there now. And that day the only thing I touched was the vac line to the brake booster to remove the solenoid and the wiring for the dtec to bypass it and go off pcm control. Which the night before was at 10.0 afrs at the same boost. So I'm thinking the problem is in there. but I've never heard of it happening and everyone I've talked to doesn't have any idea of what the problem could be.
well see this problem started happening the day I removed the dtec and has been going on ever since. the safc came into the picture 2 months later, but is what I currently have on there now. And that day the only thing I touched was the vac line to the brake booster to remove the solenoid and the wiring for the dtec to bypass it and go off pcm control. Which the night before was at 10.0 afrs at the same boost. So I'm thinking the problem is in there. but I've never heard of it happening and everyone I've talked to doesn't have any idea of what the problem could be.
So the map sensor wire is solderedback to stock?
EDIT: oh sorry you said your using a safc now. but is it soldered in? I'm just suggesting you have bad wiring to your map sensor, cause thats what caused me to throw that code.
nope not soldered. but the day we bypassed the dtec, we only touched the pcm harness not the MAP wiring. I did touch the MAP wiring later to take it off and install the safc but the problem was already around by then. Which makes me think it's wiring or a bad pcm.
edit to your edit: well my fault we didnt remove the dtec that day we were testing the buffer board and we had it bypassed and on s1 inj. afrs went to 13.9, went back to s2 inj and still 13.9. Tried adjusting the boost on the wga, it barely even changed the boost pressure which bothers me. Decided to loop it back to pcm control and bypass the dtec again completely and the afrs were the same 13.9. then I took it out and installed an safc. We didn't touch the MAP wiring the day the car started having these problems. But the night before the car was running like it should run with no fuel controller and s2 injectors, it had to have been sometime between then. We did touch the MAP wiring with the safc, which takes care of the code problem, but I don't think it takes care of my car going lean problem
Last edited by siberian57 : 06-06-2008 at 10:52 AM.
nope not soldered. but the day we bypassed the dtec, we only touched the pcm harness not the MAP wiring. I did touch the MAP wiring later to take it off and install the safc but the problem was already around by then. Which makes me think it's wiring or a bad pcm.
The map sensors wires lead to the PCM. The dtec modifies the signal between the map and pcm, so if you took out the dtec you had to have touched the map sensors wires. I can almost garauntee you that your problem is the wiring. I did the same thing with mine. 90% of safc related problems are from bad wiring/grounding issues. Go search the safc thread for that code and i bet you'll find your answer. Those connections really should be soldered.
The map sensors wires lead to the PCM. The dtec modifies the signal between the map and pcm, so if you took out the dtec you had to have touched the map sensors wires. I can almost garauntee you that your problem is the wiring. I did the same thing with mine. 90% of safc related problems are from bad wiring/grounding issues. Go search the safc thread for that code and i bet you'll find your answer. Those connections really should be soldered.
ya i corrected that edit. We didnt actually take it out. We had a bad dtec buffer board. Before we put the new one in (which we never did), we tried testing the old one and all we had to do was loop the wires in the pcm harness back so it would no longer bypass the dtec. And THAT's when it started having problems. I don't think it has anything to do with the safc because this problem started before the safc was even in the picture. And the only thing we touched was the pcm harness and the removed the brake booster vac line that's it. After that we couldn't figure it out and looped the wires back to the pcm to bypass the dtec and go off pcm control and it still did the 13.9 afrs. that's when it all started.
I put on my safc 2 months later and I tried addressing the issue again thinking it could be fuel and i swapped injectors, pumps and fprs and it didnt fix it.
Last edited by siberian57 : 06-06-2008 at 10:59 AM.
The map sensor code might not be the cause of you running lean, I'm not sure. What I do know is that the map sensor is throwing codes. I would fix that first. So, I'd suggest to get your soldering gun and reconnect the map sensor wire back to stock. I think its orange/green, I may be wrong. Just putting that back together(properly) will remove the safc/dtec from the equation. That would be my first step in trouble shooting.
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Going lean on the stocker, I don't get it
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