Hello DIY Community,
I recently bought an ANTEL AD410 model OBD2 scanner for my 1.8 Liter 2006 Toyota Corolla LE (standard transmission) with just over 93,000 miles on it. I have owned it for over 8 months now. No codes have tripped or any thing on it, but I have been wanting to looking at the live data for some time now. The only major issues that I encounter is a stuttering (like a jerking forward sensation) when I am coasting in 1st or 2nd gear (sometimes I can feel it in 3rd but usually by then I am going too fast to feel it). This occurs only when I am off the accelerator and when in gear. When coasting in neutral, the "bucking" goes away immediately. Another slight issue is that the accelerator is very touchy, like I can just barely be on the accelerator and it revs way too easily past 2,500 RPM when I do not intend to give it so much gas when I only need to take off from a start...Here is a brief list of what I have done in an attempt to fix the issues...
1. Cleaned and removed the MAF sensor with MAF cleaner...
2. Took a series of Q-tips to the throttle body butterfly valve (outside face of the valve only), soaked in throttle body cleaner, to clean off carbon and debris (lots of black soot and gunk came up and out). I only used Q-tips because I didn't have the tools at the time to remove the body itself for a deeper clean...I can clean this better for sure now, but am I ok to spray directly into the throttle body? I hope not to damage any sensors...
3. Ran some Royal Purple Fuel injector cleaner (about 15 oz bottle for my fuel tank capacity) on near empty tank (about 1/4 tank remaining). Fueled it up to mix and have since then refilled with regular gas again...
4. Bought a scanner to see the fuel trims and other live data...
The long term fuel trim as listed at +7.0% and the short term fuel trip is ranges from between -3.5 to -1.6%.
Air flow Rate from MAF sensor: 2.59 g/sec.
The absolute Throttle position sensor is also list at 16.5% when i am not even on the peddle. Normal?
The scanner also lists that the EVAP for the I/M readiness test passed the check, so if there is a vacuum leak, I am unsure what to do... I am stuck as to how to proceed further. Would a weak fuel pump throw a code?
Any help on this matter is greatly appreciated.
Thank you.
am I ok to spray directly into the throttle body?
I would remove the throttle body , otherwise you're just moving the garbage further down the intake (and potentially onto sensors)
The absolute Throttle position sensor is also list at 16.5% when i am not even on the peddle. Normal?
Relative throttle position is the one you should pay attention to, because it should be calibrated.
Also pedal position.
Well unfortunately there are dozens of things that could cause such fuel term problems. I would start by changing the fuel filter. A clock filter can do that. If not that I would pressure test the fuel pump to see if it's low. If not that I would have a mechanic professionally pressure cleaned the fuel injectors because dirty ones could do that too
