Question about 1991 Honda Accord

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Engine surges while holding accelerator steady. what do you think it could be?

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  • Anonymous May 22, 2009

    I found out the there is a short on fuse 30 which is call L passive motor I don't know what that is. please help.

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  • 87 Answers

The most likely low-tech problem is a vacuum leak. Cracked or pulled off vacuum hoses or gaskets. If you have access, inspect all those spots, flexing the hoses and looking for ones that might have fallen off. Another method is to attach tubing to a bottle of propane gas and then direct the gas stream toward suspect areas (don't light the gas!). If the idle smoothes out, you have found the air (vacuum) leak. 
The high tech problem would be a faulty throttle position switch.

Posted on May 21, 2009

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1 Answer

My 1990 Toyota with a 22re engine surges while holding accelerator steady


Fuel pump and/or pressure regulator is messed up - If gas flow is surging so will the engine. Right?

Sep 12, 2015 | 1990 Toyota Pickup

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

Feb 09, 2012 | 1996 Nissan Pickup

2 Answers

Engine Surging when not pulling hard and with cruise engaged


possible mass air flow sensor fault, dissconnect it and see if it improves slightly to confirm or have scan for trouble codes

May 26, 2010 | 2002 Volkswagen Jetta TDI

1 Answer

Jerky acceleration


check the spark plug gaps. [I think it should be 0.8mm ] too small or too large - for surging [ incomplete combustion ] . rough belts- squeel ? check correct tention & spray some penetrating fluid like CRC on the pulleys . But for the **** I really dont know what to suggest

Jun 19, 2017 | 1993 Volkswagen Jetta

2 Answers

1991 Caprice Classic 305 engine surge


Check the fuel pump pressure.
Also can replace the fuel filter, cheap and might help.

Jul 04, 2009 | 1991 Chevrolet Caprice

1 Answer

I have a 1988 Chevy C3500 1 ton PU. Engine runs great at idle and acceleration but when cruising it runs rough or surges.


if the truck has a locking converter goin bad it will surge at steady speeds such as 55 mph the converter will lock and unlock causing you to feel an surging

Mar 07, 2009 | 1988 Chevrolet C3500

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