Question about 1988 Nissan Pathfinder

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Engine at idle rpms go up and down/fast and slow?

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Check for vacuum leaks first, especially at the EGR valve very common.if none found remove and clean the idle air control motor it is a small motor located next to the air intake hose coming from the air filter.one of these should solve your problem.

Posted on Nov 14, 2010

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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.

Feb 05, 2016 | 2002 Jeep Grand Cherokee

2 Answers

Idle


MAYBE CHECK (MAF) MASS AIR FLOW SENSOR

Jun 29, 2013 | 2000 Chevrolet Tracker

1 Answer

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.

Apr 19, 2013 | Cars & Trucks

2 Answers

What can cause a Fast idle on 1999 Ford Escort?


Try cleaning the throttle body and check the gap on all the spark plugs also all electrical sensor plugs and battery terminals this could be related to engine temperature also if to hot rpms stay up longer to cool off but maybe your idle air control valve is bad when did it start?

Feb 09, 2018 | 1995 Ford Escort

2 Answers

Engine idles rough at red lights begins loping rpms drop to almost killing, then cycles back to normal, then repeats rough idle drop in rpms and loping, back and forth until I rev engine or take off


You could have a clogged fuel filter, if you haven't changed it in awhile. You could have a leak in the intake system somwhere also. When you slow down, you get less power to the engine. It may need spark plugs and wires as well, if in need for a tune up.

Mar 02, 2011 | 2001 Nissan Altima

1 Answer

Idle fluctuates fast then slow. Knocks at 30-40 mph. gas mileage down


your ECU is faulty.
New ECU and voila problem fixed

ohh ECU= engine control unit

secondhand with do just fine.

get it fitted by professional

Apr 16, 2009 | 1999 Lincoln Town Car

1 Answer

Rpms Too Low


the idle speed is controlled through the on board fuel injection control module (known as the PCM), even if u raise the idle at the throttle body the computer will slow it back down, however there is a problem that causes slow idle, do the following procedure to correct the slow idle issue, follow it exactly.

Here are some of the causes of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Apr 07, 2009 | Pontiac Grand Prix Cars & Trucks

1 Answer

Idle problem


iac motor sounds like its gone bad

Nov 04, 2008 | 2005 Ford F-150

1 Answer

1997 cougar xr7 v-6


Usually with the AC on, the idle will slow down, but your case, maybe you set the idle too fast, try set your idle slow down a little bit see if it is working.

Jul 06, 2008 | 1997 Mercury Cougar XR7

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