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08-11-2013
My car doesn't have any power under WOT and the kr shoots way up. But under half or 3/4 throttle the car pulls hard. Would a vac leak cause this? I have the po171 code and have blown smoke through finding nothing but I'm completely lost. Fuel pressure was good haven't check it while driving though.
08-11-2013
OBD-II DTC: P0171 System Too Lean (Bank 1) read this, theres more to that code then a vac leak. bad o2, or maf could be the cause as well.
08-11-2013
A good maf would kill the car if unplugged? O2 reads 450-980 something like that.
08-11-2013
theres also a fuse for the maf, it turn the car off, then unplug the maf, start the car up if it runs better the maf is bad.
check the wires to the maf, and o2 for damage too.
08-21-2013
Sorry guys I've been busy with work and school starting back up. Maf sensor unplugged while car running kills the car. Car is a lot faster with 1/2 to 3/4 throttle. Wot is very bad kr shoots up and car just puts like normal driving. If going 1/2 throttle to 3/4 once I hit over 65 the po300 will illuminate but go away once let off. Would a vac leak cause this? Only code that comes up is po171.
08-21-2013
clogged cat maybe then.
does it sound like a vacuum cleaner with a full bag when you floor it? then the cel flashes?
08-21-2013
Just got a new cat Friday. This also happens with open headers.
08-21-2013
do plugs and wires yet?
08-21-2013
Yea they've got about 500miles and the icm and coil packs.
08-21-2013
did you unplug the maf while the engine was running? thats not how to do it.
unplug it with the car off, then fire it up. if it runs better the maf is suspect.
08-21-2013
O ok ill try that I did it while it was running
08-21-2013
yeah, the car wont like it when its unplugged while running.
08-21-2013
I would try to look at fuel pressure under load. I would replace the fuel filter first and see if it runs better. Sounds like its starving for fuel.
08-22-2013
Ok thanks guys ill get back with ya on the maf after lunch and check filter when Il off.
08-23-2013
Im gonna get a fuel pressure gauge tomorrow since i dont have a night class. What should running pressure be? WOT?
08-23-2013
So i unplugged my MAF and tried driving it. It ran fine until i went to give it a little gas and it just died no stutter nothing just died.
08-23-2013
over 40 psi.
08-23-2013
Ok and does that sound like a good maf?
08-24-2013
How can I check it while driving the gauge won't reach inside the car?
08-24-2013
Tape it to your windshield.
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