Question about 1991 Acura Legend

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My engine surges in nutral or park revs up then slowes down . about 3 or 4 hundred RPMs. almost like the throtal is hunting

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It a small black box in front of your intake. air mass flow sensor is a common problems for causing the engine to surge, usually when the unit goes bad it cant sense the the correct amount of air enter the intake systems which will throw the ecu off, so the ecu stop delivering any more fuel into the engine which will cause the engine to rev up and down. there no way testing the unit, because it sealed unit. I don't know of anyplace that offer bench testing for the unit, if you do, it will cost you 50-75 buck and by the time the shipping and handling is done it will be close to 100 bucks. New one will cost you an arms and a leg, if you need to replace the unit I recommend you look on ebay or get one from a junk yard, it should run you about 75 -100 bucks used. Check the distributor unit cap and rotors, this can also create the problems. also just a reminder with the legend, if you have over 100k miles its very important that you change the timing belt on that car if you have not done so. do every 3k miles oil change that car will run for you many more years. hope that help some...

Posted on Oct 04, 2009

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When was the last time you changed your fuel filter, on this model it is right on the firewall near the brake master cylinder. this is usually a thing that gets missed during your maintenance

Posted on Oct 04, 2009

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2 Answers

What is causing the fast Idle and slowing down


well gee, there are 50 reasons.
did you scan the PCM yet, if not ,why not?
when the idle surges, that means.
NO RPM ranges stated, if super low rpm check EGR.

1: engine lean and ISC dead, or cant handle the huge engine power drop..The PCM can even make this worse!, buy hunting the ISC to find spec, idle and failing... to...
2: or any of 50 other things causing huge engine power drop and PCM can't maintain idle controls.
super lean burn.(bogging)
super rich burn, misfire for 50 reasons.

i cant hear your engine,nor feel it, or see it shake from gross misfiring.
no can i drive it and see/feel power loss,
can I?
asking net bunny's this (blind as bats)
is "OVER THE TOP" no?
so here , ill toss the dice for you
and guess gross misfiring.
ever get a tuneup this decade, if not bingo , no?

and the others...

http://jeepdied.com/Misfire101.html

link even has the 50 cause list, to show the futility of guessing!
we do 1 to 10 tests. and find it.
for sure.

as you can see EFI systems are complex.
gue$$ is not only expensive but can net you 2 problems easy.

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1 Answer

Audi 2002 a4 v6 2.4l when the car first starts the RPMs surge up and down unsteadily this stops if you give a few revs on the accelerator pedal. When driving around 50kph the rpms surge slightly it feels...


You have two problems. The surging is from a dirty throttle body and /or air filter. The selector light could be from a bad selector switch or internal transmission problems. Have the car scanned for codes.

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Acceleration sticks


i think the engine rev needs to turn down a little

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2001 buick century runs fine when in park and nutral i can put it in drive and sometime i can go 10k sometimes only get 1k the it starts spudering and wont rev up but will idle fine put it in nutral and...


I think you have an engine speed sensor fault. its not reading the engine speed or the motion speed. needs these two to change speed and ( gear). one is connected to the abs unit and the other is on the engine. usually if they both go its down to the gear box ecu. you can check if you have it on a ecu reader. will have fault codes or not be read at all.

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1995 Grand Prix se 3.1L V6 rpms rev up high in park


Does the engine slow down in drive, or is it still running fast and trying to pull away from a stop ?
The problem could be a vac leak, or a sticking idle control valve.
The computer controls idle speed by how much air enters thru the control valve.

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1999 Audi A8 Quatro 4.2 surges


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I have a 2004 mazda 6, on the highway when i let off the gas the car slows down rapidly then when i gently push on the gas the car jolt forward, if i step on the clutch the rpms surge kind of like a rev...


Check the PCV valve and vacuum lines for leaks. You also need to check the Vacuum advance as it sounds like it might be sticking a little.

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Push gas peddle and once i reach about half throttle the engine bogs down almost as if it is going to stall Its not the fuel pump or the filter when vehicle is in park and i push peddle to the floor the...


check your TPS throtel position sensor. and the vehicle has a rev limiter so it wont over rev n park and nutral. but thats the first thing i would check do to many TPS's wear out and can get dead spots in them.

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1 Answer

1993 ford explorer as soon i start car,on park and nutral engine


This vehicle should be storing a code, take the truck to the advance auto parts store or auto zone and ask to have them hook up a code reader to it this should give you at least a general idea of where to check or replace parts. If the truck is not storing a code I would say it is either the MAF (mass air flow ) sensor or the throttle positioning sensor, but usually when the TPS (throttle position sensor) acts up you will hear a surge in the rpm's, in other words the engine speed will tend to go up then come down go up come down etc.

Jul 08, 2009 | Ford Explorer Sport Cars & Trucks

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I just bought a 2001 explorer sport 2dr, 131,000km and all of a sudden when i was slowing down at a light, it got alittle jerky, then stalled out completly. Also i have only driven about 50km and i've gone...


i dont know why it stalled out but i do know if in park or neutural it has a limitor on it that will not let the rpms go to high and it feels like its missing but this is normal to keep the engine from reaving to high.

Jan 29, 2009 | 2001 Ford Explorer

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