Question about 1995 Pontiac Bonneville

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Cruising at 2000 rpm's - step on gas engine bucks, manually downshift to 3rd gear and engine accelerates without a problem. Full acceleration engine fails to rev to red line. 115k miles, no engine light..

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Could be your throttle postioning sensor. short terms TPS

Posted on Apr 09, 2011

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Transmission surge at cruise


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Drive cycle


Here is the OBD2 emission system drive cycle test procedure.
Engine coolant temp must be below 70c (158f) before starting the engine for either the first or second trip
The fuel level should be less than 1/2 full
First trip:
Start engine, idle for at least 1.5 minutes
Drive 3 minutes, hold b/f schdl: 1.5-2.0 msec, selector lever "3rd" eng rpm 1,800-2,000 A/C switch:ON Hold the recommended b/f schdl range. Allow road speed to vary as necessary.
Drive at 55-65 mph for 1.5 min b/f schdl 2.0-3.2 msec, selector lever "5th" Engine rpm 2,200-3,000
IGN "off" for at least 10 seconds (not more than 5 min)
Dive at 50-60 mph for 3 minutes Selector lever "4th" keep engine speed above 3,000 rpm Allow speed to vary if necessary. Do not decelerate for more than 3 consecutive seconds. A/C switch ON.
Drive at a steady state cruise of 53-58mhp b/f schdl more than 1.8 msec selector lever "5th" eng rpm 2,400-2,600
Downshift to "4th" and decel more than 5 seconds without breaking, then idle for 1 minute.
Drive two minutes b/f schdl less than 2.0 msec Accelerate to 41 mph, decelerate to 34 mph, accelerate to 41mph. Do not completely release the accelerator. A/C switch off.
Idle 1 minute in park or neutral
Drive two minutes Steady state cruise at 31-44 mph. Selector lever "4th" A/C switch OFF. Hold the accelerator pedal as steady as possible. Allow speed to change if necessary.
End of first trip. Turn the key off the begin the second trip.
Second trip:
Start engine, idle for at least 1.5 minutes
Drive 3 minutes, hold b/f schdl: 1.5-2.0 msec, selector lever "3rd" eng rpm 1,800-2,000 A/C switch:ON Hold the recommended b/f schdl range. Allow road speed to vary as necessary.
Drive at 55-65 mph for 1.5 min b/f schdl 2.0-3.2 msec, selector lever "5th" Engine rpm 2,200-3,000
IGN "off" add four gallons of fuel
Dive at 50-60 mph for 3 minutes Selector lever "4th" keep engine speed above 3,000 rpm Allow speed to vary if necessary. Do not decelerate for more than 3 consecutive seconds. A/C switch ON.
Drive at a steady state cruise of 53-58mhp b/f schdl more than 1.8 msec selector lever "5th" eng rpm 2,400-2,600
Downshift to "4th" and decel more than 5 seconds without breaking, then idle for 1 minute.
Drive two minutes b/f schdl less than 2.0 msec Accelerate to 41 mph, decelerate to 34 mph, accelerate to 41mph. Do not completely release the accelerator. A/C switch off.
Idle 1 minute in park or neutral
Drive two minutes Steady state cruise at 31-44 mph. Selector lever "4th" A/C switch OFF. Hold the accelerator pedal as steady as possible. Allow speed to change if necessary. I especially like the part where they want you to add four gallons of fuel. Not three gallons, not five gallons, four gallons. Gotta love those Nissan engineers. ...and of course they state that if the trace is not followed exactly (i.e. you botch the acceleration/deceleration) you have to start all over again from scratch

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Bout a week after getting my 2009 crv i noticed every time i let off the accelerator the car will appear to downshift sometimes it is quite a rough downshift it has done this for the last 8 months. Dealeri...


the car is fitted with a fuzzy logic gearbox,computer controlled within the engine management system.it will try to make you drive as economically as possible taking into account the gas pedal possition/road speed and load.it will also adapt to your driving skills.
so if you drive in town all the time it will change at higher revs and out of town, if you accelerate gently,lower down the rev range.Try this.without using the gas pedal put the car in drive and let the car do the work,it will accelerate on its own upto 4th gear.
then try again, from stop, keeping your foot about 1/3rd down on the gas and let the car do the work try not to move your foot.then, if you can, drive using only a max of 1/3rd gas pedal all the time and you will find within 100 miles the car has adapted to this and your gas mileage will go thru the roof. also the car will adapt to high grade gas.adjusting engine output to match.

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I am glad my solution provided you with happiness. A gift, no, you do not need to do that. I appreciate the thought, though. The graciousness of a "FixYa" rating regarding my helpfulness would be GREATLY appreciated. That I all that I need form you. A happy Client. THAT is what FixYa is ALL ABOUT. Have a great week. Thanks again.

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