Question about 1995 Toyota Corolla

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Engine rpm varies erratically

I'm having problems when driving at highway speeds (over 60mph) for more than 30 or 40 minutes, the car starts to accelerate and decelerate in a ittermitent manner, the tachometer shows an erratic variation of the engine's rpms, and stops when I take my foot from the accelerator. Now if I push the accelerator further the engine struggles til death, but it starts agian with little efforts. My car has an automatic transmission, and the failure has the same behavior if I shift to "N".

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Try fuel injector cleaner in your next fuel fill. sounds lke your injectors are dirty

Posted on Feb 28, 2009

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What does the MIL code "PO 320" mean, please?


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Runs 2100rpm at highway speeds


a transmission problem. (slip>?)
why not?
1: check all fuse with a meter, in both fuse boxes.
2: check ATF levels by the book, not guessing or using engine oil methods !
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no year stated, wow...... now that does make this a hard row to hoe.

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Driving on the road the RPM goes higher wituout speedind


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1 Answer

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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Vehicle unused with dead battery for 6 months will start but not maintain idle


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1 Answer

I have a 2005 Ford Focus ZX4 ST. I have less than 73k miles on it. Have never had any issues with it. Perform all the regular maintenance at required intervals. About a month ago the check engine light...


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For some time the rpms will jump about 200 rpm while I'm driving at highway speed. It doesn't feel like the trans is slipping but the revs constantly jump even with cruise control on. My mechanic couldn't...


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Feb 04, 2009 | 1996 Honda Prelude

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