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is there any way to check for a bad fuel injector?
I am an electronics guy and the method to check injectors is totally different from the way usually done by most of mechanics or mechanical engineers. This doesn't need to remove injectors from the engine because the check is done electrically just using an oscilloscope with a current prove and a voltage probe. People say, "It's very strange and we don't understand what you do and what you explains". So this is not for everyone but if you are interested in, I will show you how to do it. The chart below is the waveforms for the judgment.
This method can tell that injectors are working OK or not if the problem is caused by the moving slider inside or the bad coil of the injector. The key point is the green arrow at the centre of the drawing. Unfortunately, this method can't tell that the problem is caused by the clogging at the gate.
heres the thing.. i already swapped to another one..had the same issue...i took it to a shop who put it on a 10k snap-on scanner..the owner said it was the maf..i said bull****! i swapped it, i said put the one in the trunk back in it..i keep it in a plastic bag..he swapped it and it fixed it. i dont get it. anyways he a good friend of mine and didnt charge me anything..i bought him a pizza..all good. i am looking to get another one to have on hand..if anyone knows of a good one or has one,ill gladly buy it. btw i never clean these things...ever
Curious question: Has anyone ever tried to test the IAC using the method of battery and connector pins (in sequence)? I tried that before but it never worked. I finally cleaned the IACV and put it back in without knowing if the mechanism was good or bad. I wonder if there is a trick to make it work and always sticks open..
I remember there was a discussion about IAC valve in one of the old threads. You have to repeat the process many times for the valve to close or open. The IACV is a step motor and it goes very slowly (maybe a few dozen times to see real movement). But, I am not going to do experiment but I will keep that in mind for next time.
Curious question: Has anyone ever tried to test the IAC using the method of battery and connector pins (in sequence)? I tried that before but it never worked. I finally cleaned the IACV and put it back in without knowing if the mechanism was good or bad. I wonder if there is a trick to make it work and always sticks open..
yes, thats my vid on Youtube! Its an EGR valve but I believe the stepper motor IAC works the same
You have to chuck a dial indicator up to it to realize its moving as it only moves like .004 per pulse. This runs at Khz (thousands of pulses per second) so it will move under the ECU like a little electric motor. My IAC bearings were almost seized up and it would barely move until I lubed them and now it works great. There were really bad@ 200K miles. 1800 RPM idle!
