Automatic Downshifting.......

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Meaux
Posts: 357
Joined: Fri Dec 24, 2004 7:03 am
Car: 94Q45, 92Porsche 968, 72Porsche 911, 89Maxima SE, 98Honda Civic, 85F150 w/95 5.0

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94 Q45......78Kmi......cleaned MAF, and Throttle body....

Now that I've reset my TPS back to it's orginal position and my idle is back to normal, I'm back to the original problem which is:

#1- Accelerating from a complete stop, the car starts rolling and then seems to stumble. I have to press on the accelerator more to get the car to move, then it takes off....

#2- When coasting from 50mph down to 25mph, tha automatic dosen't downshift to 2nd or 3rd, I almost have to press the accelerator to the floor to get it to downshift.

Gas mileage really stinks since this started happening......I know lugging this thing around isn't doing the automatic any good......

Speed Sensor? I don't have an FSM so I'm just guessing.

Should have a new computer next week so I'll be able to download and unzip a FSM.

Thanks.............


Q45tech
Moderator
Posts: 14296
Joined: Tue Apr 30, 2002 3:19 am
Car: 1990 Q45 342,400 miles 22 years ownership with original engine
1995 G20t 5 speed 334,000 miles 16" 2002 wheels - 205/50/16 Sr20ve vvl

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Whenever there is a transmission sensor fault or tcu fault, the diagnostic display will show it..........same with a serious way out of range engine sensor fault via check engine light [except knock sensors].

The problem is ODB1 has very very very wide ranges of acceptability.


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