Volkswagen 1.6i strange problem - Fixed
I have a question though..
Will this cause the car to seem as if it is for starving for fuel on partial throttle? (I honestly dont think so hence I didnt actually suspect a faulty throttlebody)
And, did you work with 3pin knock sensors? i have no idea how to test them, all 3 wires show very less voltage and im not sure if it uses a 5v ref or not. I did see 1 of Paul's videos where a faulty knock sensor was retarding timing (fuel starving effect).. However, I also tried unplugging the knock sensor and it didn't make a difference.. I will do the other tests and post up the results in a few hours. Thanks for the help
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I will disconnect the tps signal now and post the result.
I did not notice the knock sensor values on measuring blocks.
Unfortunately i don't have a scope yet..
I don't have what you would call a wiring diagram - I have an ecu pinout that the guys here use to convert the standard ecu to an aftermarket management system. The pinout data does show me the knock sensor wiring but it does not tell me the purpose of each wire (pin1=5v ref, pin2=signal, etc)
Because of the hunting idle, I could not set the timing 100%, i tried basic setting block 004 but it does not give me the option to lock the rpm to set the timing, is there another block that will lock the rpm for timing setting?
The timing is somewhat close to correct, mp9.0 requires 6degrees btdc of timing at 1500rpm. So i got somebody to hold the rpm at 1500rpm while i adjusted the distributor to 6deg btdc. Once I do sort out the idle issue i will correct the timing. (Im sure a few degrees of timing would not give me the problem that i am having)
Heres the pinout info that I am using
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The throttlebody wiring was tampered with and i found the following values from my recent test
Key on engine off - testing throttlebody wiring
Pin 1: idle control motor +12v - 0v
Pin 2: idle control motor ground - 0v
Pin 3: closed throttle position switch for idle motor - 11.8v
Pin 4: tps +5v supply/reference - 5.03v
Pin 5: tps signal to ecu - 5.52
Pin 6: not used
Pin 7: ground - 0v
Pin 8: closed throttle position switch for idle motor - 5.52v
Key on engine on
Pin 1 - varies around 2-13v
Pin 3 - snapping the throttle 8-13v
Pin 8 - constant 3.4v
Sensor ground on pin 7 was way too loose and broke off when i touched it, I am going to sort that out and retest. I honestly have no direction with this car and don't know what to expect next.
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The car had alot of people working on it though, had a distributor problem, starter problem, alternator problem, all of those parts were changed with aftermarket pirate parts.
I did clean the entire throttlebody.
The voltages on the closed throttle position switch is confusing me.. Common sense tells you that there should be a closed throttle position switch and an open throttle position switch, and thats the reason I dont want to rely on the pinout info that I have.
I was unfortunate that i could not meet my friend who has a similar vehicle to do a few tests on his car
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Isnt the idle control motor a pwm circuit? (pulse width modulation)
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wiki.ross-tech.com/wiki/index.php/Throttle_Body_Alignment_(TBA)
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And i did it every time I disconnect the tb, made no difference
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What do you mean by check the ecu to make sure its not the second one?
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And the tb does cycle for a few seconds
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