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#1
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bridging of microswitch and tps- safe or not?
car is '88 190e 2.3
My idle was high in N and P (around 1500) Thanks to Duke I traced the problem to throttle position sensor (TPS) . Wide open position was working and closed position was not showing continuity at all. I tryed spraying everything with different contact cleaners but that didn't fix the thing. I took a piece of wire and conected + wire from the microswitch with the + wire from the TPS closed throotle position. so when microswitch is activated, TPS is activated too... everything works fine for now (idle in P and N is around 850 and there is no jerking when I engage in D or R) Now my question is is this thing safe to do? Is there any risk of fire or simmilar? Thanks
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------------------------------------- 1988 mercedes 190e 2.3 AT 160k miles |
#2
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Did you disassemble the linkage, clean and lubricate it? I think that will fix your problem. When my TPS misbehaved I cleaned both ends of the throttle shaft and disassembled, cleaned, and lubricated the linkage.
The microswitch activates fuel flow startup after deceleration shutoff. The linkage is set up so the microswitch opens before the throttle valve, so their is no "jerk" when fuel flow is resumed. By using the microswitch as a surrogate for the TPS you eliminate this feature and you might notice a slight jerk when opening the throttle after deceleration, but this may be a small price to pay since you must remove the fuel meter and throttle valve to replace the TPS. I still think that if you "overhaul" the throttle linkage as outlined above you have a good chance of solving the problem and can wire the system back to OE spec. Duke |
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