experts?
you still should keep checking, i've never heard of anyone adding fuel up top on a properly running bpu. I think you just bandaided the situation.Zerosoul said:problem fixed. I dialed up fuel pressure 0.4 bar more and increased 20% more fuel up top with my HKS AFR and my A/F ratio dropped to 12.5:1 all the way to 5th. its always the simple thing....damn
Jonas
Actually, OBDII data logging by Supra owners have shown that the gauge always stays in "ok" because it always is. A couple years ago, testing showed +/- 10 degrees on a BPU car in a wide variety of conditions.fyi, the stock coolant gauge pretty much tells you nothing, it has three readings... cold ------- OK ------- OH SHIT, TURN OFF CAR
I agree, but at least I know the problem is lack of fuel, and since I have almost brand new everything in my fuel system except the injectors, I will replace them next. but for now, at least I wont be running lean.NOVAsupra said:
you still should keep checking, i've never heard of anyone adding fuel up top on a properly running bpu. I think you just bandaided the situation.
what kind of A/F reading are you getting it from? my car tend to run lean also after a long highway trip then doing a high end pull. how does your EGT reads? both my EGT and A/F correspoond to eachother pretty well, when my A/F shows lean, my EGT is high and vise versa. my A/F sensor probe needs to be heated up to about 600-800C in order to give correct reading, its a Tomei.carcnoid said:I have had similar problems.
I've got a wideband o2 on the car now and have had a widely varying range of o2 readings.
The first thing that I noticed was that when I was on long trips (30 mins+) the car was going lean. The only thing that I could come up with was that 18v to the fuel pump was causing the fuel to heat up after a while. So I removed the B and M power plus and decreased the voltage to the stock setup.
That didn't work entirely. I could drive for a little longer, but the AF's would still get lean after a while. Just then my water pump started leaking like mad and have since replaced that. The car seems to be running a bit better, however, the AF"s are still variable. I have a Fuel Pressure gauge and it doesn't appear that the fuel pressure is the problem. At the end of the curve I have it richened +12%. That seems a bit much (100 percent duty on the injectors?).
Does anyone know why my AF"s could be so variable? I am running VPC, S-AFR, and SP60.
It also doesn't appear that my EGT's are corresponding to AF.
Any ideas?
Thanks!
carcnoid said:ZS,
My A/F's have gone to 14.1 to 15+ after a long drive. These were numbers resulting from 4th gear pulls near redline. My EGT's used to be real hot (900c) always, but now rarely get that hot. I have had A/F of 14+ with EGT's less than 800 before. As far as I know, 900 is the upper limit on the EGT's.
It seems to me that your problems are very similar to mine ZS...
TP,
Yeah, that sounds like a viable problem, however, my temp gauge on my dash stays put all while this is happening. I think I will be getting a fluidyne soon to overcome some other problems that I have had recently.
Any other thoughts?
On all other toyotas I can think of-there are two different sensors-one just for the gauge and one for the coolant temp signal to the ecu-if say the coolant temp to ecu signal sensor was shot-but the sending unit to the temp gauge was alright-your gauge would remain normal-just a thought
Thanks!
wow.....14+ A/F is NOOOOOO good.....are you using a wideband O2 sensor? where is your EGT probe mounted at? I assume its before the turbo in the manifold? if its on DP, 900C is gonna melt your rings. my A/F is bad, but not as bad now, its down to 12.5 at the end of 4th gear pull, EGT has dropped also after I dialed in more fuel pressure. you might have a fuel issue....carcnoid said:ZS,
My A/F's have gone to 14.1 to 15+ after a long drive. These were numbers resulting from 4th gear pulls near redline. My EGT's used to be real hot (900c) always, but now rarely get that hot. I have had A/F of 14+ with EGT's less than 800 before. As far as I know, 900 is the upper limit on the EGT's.
It seems to me that your problems are very similar to mine ZS...
Thanks!