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rpm drop, engine shakin

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Old Jul 17, 2005 | 01:11 PM
  #1  
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Default rpm drop, engine shakin

hey guys, got some weird symtpoms this morning, when i put the car into drive rpms drop and whole car starts shaking, i put it in neutral and i got the same thing, reverse does not seem to cause the rpm drops, even when i put it in park i still get it. i would think that it might be the burned coil but then the problem is not permanent, this rpm drop does not happen every time i start the car. could humidity cause this? i dont think any changes in perfomance.
 
Old Jul 19, 2005 | 07:34 PM
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Default RE: rpm drop, engine shakin

i think i found out the reason why the i'm gettin the rpm drops, i disconnected the battery and now computer in the learning mode, with time during the day i was gettin less and less of those. i will post the final resolution in few days.
 
Old Jul 19, 2005 | 11:08 PM
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Default RE: rpm drop, engine shakin

Good luck VMF!
Lets us know your final resolution.
 
Old Jul 20, 2005 | 08:53 PM
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Default RE: rpm drop, engine shakin

drove the car today, with and without AC, rpms are back to normal!
so it was an ECU learning mode
 
Old Jul 23, 2005 | 12:30 AM
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Default RE: rpm drop, engine shakin

i have kind of the same problem, what do you mean with learning mode and how do i know if its in it and how do i get it out of learning mode if its in it?
 
Old Jul 23, 2005 | 03:36 PM
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Default RE: rpm drop, engine shakin

The ECU is always in learning mode. The problem is that the settings are so far off the default ones that it takes the computer a little longer to learn when reset.

Novahawk, if you reset the ECU(by either removing the fuse or the battery) it will take a while for the computer to "learn" the optimum settings for proper operation.
 
Old Jul 25, 2005 | 04:11 PM
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Default RE: rpm drop, engine shakin

What was the problem in the first place?
 
Old Jul 25, 2005 | 09:16 PM
  #8  
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Default RE: rpm drop, engine shakin

learning mode, ecu drops to defaults when u disconnect the battery, after few drives everything went back to normal
 
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