Originally posted by pcfnet
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engine refuse to REV - intermittent
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Originally posted by UrS4boy View PostSorry. That makes no sense.
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Originally posted by prj View PostThe sensor is only used for boost control. And in case the MAF fails for substitute load calculation. It has no effect on the car not starting/stalling.
RS2'd 93 UrS4 5 spd sedan
94 UrS4 V8 6 spd manual avant
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Originally posted by hunker7 View PostMy TPS failed couple of weeks ago and idle was perfect. Car is unresponsive when driving that's all.
I was aslo suspecting my own fault when doing the MAF connector cleaning, I took out all the pin and clean individually and put it back. I was wondering maybe I accidentally put the pins back to the connector incorrectly.... However after this I did manage to start the car finally with smooth idle but the engine is still unresponsive intermittently when the throttle is pressed/opened.RS2 >> Ferrari: Performance/look ratio
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Originally posted by UrS4boy View PostSo the throttle potentiometer does not provide the ECU with any information that the ECU uses to increase/decrease the injector duty cycle?
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Originally posted by Rusty View PostThrottle Position Sensor would be my bet. I've had this when I've forgotten to reconnect it after doing work on the car and had a brief problem with my new build, as I was using a TPS that had sat for a while but that's cure it. It can be replaced with a spare easily enough. HTH
I am not sure if this makes sense, but if the TPS is not working correctly the ECU may think I am putting some load to the throttle while starting the car, which could inject too much fuel, flood the engine and wont start...RS2 >> Ferrari: Performance/look ratio
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Originally posted by UrS4boy View PostBTDT. Scared me.
Here is some info that might help:
G69 / F60 Throttle valve position potentiometer /idle switch information:
http://forums.quattroworld.com/s4s6/msgs/20405.phtml
Based on this schematic, it makes the test procedure a bit easier to understand:
Testing the F60 Closed Throttle (Idle) Switch is as follows:
Across Pins 4 and 6 on the switch:
Closed = 0 ohms (continuity)
Open throttle (slightly) = infinite ohms (open)
If either fails, adjust switch as per procedure above.
Testing the G69 Throttle Position Potentiometer:
Across Pins 1 and 2 on the switch:
Must be 1500 to 2600 ohms
Across Pins 2 and 3 on the switch:
Throttle closed = 750 to 1300 ohms
As throttle is opened from closed to WOT = increase to 3600 ohms
If NO, replace sensor.
The above test info is now available as a single sheet that you can print-off and take out to your UrS when the need arises.
http://12v.org/urs/G69F60ThrottlePos...hTestSheet.pdf
RS2 >> Ferrari: Performance/look ratio
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Originally posted by pcfnet View PostFrom your experience can the TPS itself cause the engine refuse to start at all? I am ordering the TPS now but I am trying to dig out any other potential cause which cause the engine refuse to start at all.
I am not sure if this makes sense, but if the TPS is not working correctly the ECU may think I am putting some load to the throttle while starting the car, which could inject too much fuel, flood the engine and wont start...
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Just to update, I swap the tps last night (ordered it from audi tradition) . I install in a way that when the throttle is just open I can hear the click at the same time. The vcds reveal the "TA angle" to be about 8 degree. Then the engine start! I run it for 10mins and partial open the throttle to around 2-3k rpm slowly, everything seems working fine. I'll try to get the car running on the road later tonight.RS2 >> Ferrari: Performance/look ratio
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Originally posted by pcfnet View PostJust to update, I swap the tps last night (ordered it from audi tradition) . I install in a way that when the throttle is just open I can hear the click at the same time. The vcds reveal the "TA angle" to be about 8 degree. Then the engine start! I run it for 10mins and partial open the throttle to around 2-3k rpm slowly, everything seems working fine. I'll try to get the car running on the road later tonight.RS2'd 93 UrS4 5 spd sedan
94 UrS4 V8 6 spd manual avant
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That means your MAF is bad. And your TPS was bad too.
It does not use TPS info unless the MAF signal is wrong.
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