Question about 1990 Chevrolet Cavalier

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SLOW SPEED MISSING AND POOR IDELING

  1. WHEN I APLAY BREAK RPM NEEDLE DOWN VERY FAST AND UP AND DOWN THEN MY CAR SHUTDOWN IF I PUT ON AIR CONDITIONER OR FULL LOAD.
  2. STARTING PROBLEM LITTLE ONLY.
  3. ALARM ABS,ENG,ETS CONTINUSELY ON.
  4. WHEN SHIFTING P TO D VERY MUCH SOUND .
  5. I FEEL BREAK PUMPING VERY SLOW .

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  • 34 Answers

Your I.A.C.(idle air control) needs service either its dirty or needs replacing.

Posted on Jun 26, 2008

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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

1 Answer

2000 mercury villager, runs a fast idle. whether cold or warm the idle remains at a high idle speed, it even pulls with the brake applied.


Could be a vac leak, or a dirty throttle body, or a faulty idle air control valve. The computer controls idle speed by regulating the amount of air into the intake. Could also be something pulling on the throttle cable such as the cruise control.

Sep 28, 2012 | 2000 Mercury Villager

1 Answer

1996 GMC jimmy rough idel and dieing when driving.


i have seen many strange things happen with the distrib cabs on these

Aug 22, 2012 | 1996 GMC Jimmy

2 Answers

Nun stable of RPM


Check for vacuum hose off, broken,cracked, or loose at a connection.

Mar 14, 2011 | Toyota Corolla Cars & Trucks

1 Answer

Idels fine when driving it sometimes loses power and stalls if you rev the idel above 3000rpm it stops and runs fine till you stop or slow down the idel below 3000 rpm it shutters and...


If you don't have a check engine light, Start with the air and fuel filter, work your way up to a tune up. Clean the throttle body as best you can on the inside, behind the throttle plate/s

Feb 24, 2011 | Honda Accord Cars & Trucks

1 Answer

I installed new intake monifold gaskets because the bottom one was sucking air in and my 1996 dodge intrepid 3.5 liter engine would run at 2300 RPM'S. After changing the gaskets the car is hard to start...


Take it to bits again and check the gasket you put on and all the other gaskets as it still sounds like you have air sucking and a blockage somewhere else so check out all parts you done and the parts you dident

Oct 08, 2009 | Dodge Intrepid Cars & Trucks

1 Answer

Engine idle speed


Sounds like you idle air control valve is starting to mess up. You can actually take this off and clean it with throttle body cleaner and it should help get your idle back to normal. As is sounds the idle air control valve controls how fast/slow your car idles. It is located on the throttle body normally held on with a couple of screws. The throttle body is where the air duct hose coming from the air filter box ends at the engine block. Here is a picture of what you are looking for: a483326.jpg
Make sure that you clean the valve portion and not the electrical plug with the throttle body cleaner. Let it air dry or blow lightly with compressed air before putting it back on. Let me know if you have any more questions. Thanks for using FixYa!

Aug 01, 2009 | 1998 Ford Escort

4 Answers

Engine idle is too low once air conditioner is turned on


Take idle air control valve off & give it & port it came out of a good cleaning with throttle body spray cleaner, and see if that cures it. If it does, but starts to do it again later, replace it.

Jul 17, 2009 | 1998 Honda Civic

1 Answer

My honda problem


first the operating range for the fuel is 35 PSI idel and 50 at full throttle and the vachum boost will allow 4 pumps very fast before it runs out of vachum thats why yo don't wantto pump breaks. and the powersteering is hydrolic and has nothing to do with vachum.

Jun 21, 2009 | 1994 Honda Civic

2 Answers

Flatlining at 3000 RPM


maybe the cam timing is off. If the engine was torn down and reassembled wrong, that would do it. Connect a vacuum gauge to the intake manifold and see what you get for vacuum readings.
It should be about 17 inches at idle. And, it should be steady.

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  1. NORMAL READING: Needle between 51-74 kPa (15-22 in-Hg) and holding steady.
  1. NORMAL READING DURING RAPID ACCELERATION AND DECELERATION: When engine is rapidly accelerated (dotted needle), needle will drop to a low (not to zero) reading. When throttle is suddenly released, the needle will snap back up to a higher than normal figure.
  1. NORMAL FOR HIGH-LIFT CAMSHAFT WITH LARGE OVERLAP: Needle will register as low as 51 kPa (15 in-Hg) but will be relatively steady. Some oscillation is normal.
  1. WORN RINGS OR DILUTED OIL: When engine is accelerated (dotted needle), needle drops to 0 kPa (0 in-Hg). Upon deceleration, needle runs slightly above 74 kPa (22 in-Hg).
  1. STICKING VALVES: When the needle (dotted) remains steady at a normal vacuum but occasionally flicks (sharp, fast movement) down and back about 13 kPa (4 in-Hg), one or more valves may be sticking.
  1. BURNED OR WARPED VALVES: A regular, evenly-spaced, downscale flicking of the needle indicates one or more burned or warped valves. Insufficient hydraulic valve tappet clearance will also cause this reaction.
  1. POOR VALVE SEATING: A small but regular downscale flicking can mean one or more valves are not seating.
  1. WORN VALVE GUIDES: When the needle oscillates (swings back and forth) over about a 13 kPa (4 in-Hg) range at idle speed the valve guides could be worn. As engine speed increases, needle will become steady if guides are responsible.
  1. WEAK VALVE SPRINGS: When the needle oscillation becomes more violent as engine rpm is increased, weak valve springs (6513) are indicated. The reading at idle could be relatively steady.
  1. LATE VALVE TIMING: A steady but low reading could be caused by late valve timing.
  1. IGNITION TIMING RETARDING: Retarded ignition timing will produce a steady but somewhat low reading.
  1. INSUFFICIENT SPARK PLUG GAP: When spark plugs (12405) are gapped too close, a regular, small pulsation of the needle can occur.
  1. INTAKE LEAK: A low, steady reading which can be caused by an intake manifold or throttle body gasket leak.
  1. BLOWN HEAD GASKET: A regular drop of fair magnitude can be caused by a blown head gasket (6051) or warped cylinder head-to-cylinder block surface.
  1. RESTRICTED EXHAUST SYSTEM: When the engine is first started and is idled, the reading may be normal but as the engine rpm is increased, the back pressure caused by a clogged muffler, kinked tailpipe or other concerns, will cause the needle to slowly drop to 0 kPa (0 in-Hg). The needle then may slowly rise. Excessive exhaust clogging will cause the needle to drop to a low point even if the engine is only idling.
    When vacuum leaks are indicated, search out and correct the cause. Excess air leaking into the system will upset the fuel mixture and cause concerns such as rough idle, missing on acceleration or burned valves. If the leak exists in an accessory unit such as the power brake booster (2005), the unit will not function correctly. ALWAYS FIX VACUUM LEAKS.

May 25, 2009 | 1994 Ford Mustang

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