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Engine wont idle above 3000rpm.

Possible vacuum leaks or comuter problems?

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Ideal is about 6 to7 hunderd rpms for most chevy automatics .You need to say engine size and year when you ask questions like this.
My best guess is a problem with the catiylitc converter they tend to clog .Did you hear rattleing from it before this problem started .This is a sign there going .If exhuast gases can't get out the engine will run but have no power or rev up .
The good news is their not expensive 2 hunderd to 250 parts and gaskets not installed .

Posted on Apr 16, 2015


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1996 T100 V6 CHANGE tps, 3 coils ,spark plg,wires, check fuel pressure ,itwill not rev above 3000 rpm??

may be a vacuum hose is rotted out that leads to a device only activated over that limit; or a vacuum device that just fails to maintain good vacuum when it hits that level of demand.

Dec 09, 2013 | 1996 Toyota T100

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My holden radeo is sergen alote going along the h.way iv renewd fuil pump leards spark plugs and other things

Surging is how it spells, but serging is how it sounds...2 things, I could guess at, given we're just out here together in the ethernet, and you didn't bring the car...well, number one, get you a olde vacuum gauge and measure intake manifold vacuum at idle, and at off idle-like near 2000 rpm's. Reading a vacuum gauge on a running engine can tell you a lot; all healthy engines run with a steady manifold vacuum of 17-21, I live at about 3000 feet above sea level, so I can have a steady vacuum reading of 15 on an idling engine and still be pretty good. If you have low vacuum in the intake manifold, you have too much air in the intake. It's that simple. Too much air means a vacuum hose or manifold is leaking. it upsets the fuel/air mixture for the engine to run as designed.
Number 2. maybe the first thing you should do actually is scan the engine computer for any trouble codes, especially any related to your surging. Write them all down, just you know, prioritize them. It's possible a computer sensor or controller is bad, or also possible that the computer doesn't even know there is a problem. But trouble codes are shortcuts to finding the problem. Well, good luck, keep at it and you'll find it, just like that pot of gold I, i jokes !

Feb 12, 2013 | Cars & Trucks

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The MOST LIKELY cause of an engine surging and refusing to idle is a vacuum leak. Check all vacuum line connections. You can also pinch rubber vacuum hoses off one at a time near the intake manifold to see if the engine idle changes, - don't forget to check the hose to the brake booster. If pinching off the booster hose fixes the running problem it is possible that the booster itself is leaking if you can't find any leak in the hose.

You can check for vacuum leaks at the intake manifolsd gaskets and throttle body base by squirting some carburetor cleaner around these areas. If you spray this into a vacuum leak area, you will hear a change in engine RPM.

Aug 16, 2011 | 1994 Chevrolet S-10 Blazer

2 Answers

On depressing clutch, engine cuts out. Other times engine wont idle but race to 1500 to 2000 rpm

check all vacuum hoses for cracks rips tares or disconnection possible vacuum leak

Feb 08, 2011 | Ford Escort Cars & Trucks

1 Answer

When i start the engine it will run at about 3000rpm .i checked the cables at the carb and the gas.what else could it be pedal

Check for vacuum leaks. Check PCV hose and other vacuum hoses. Spray carb cleaner around intake, throttle body and vacuum hoses while idling in park. If spraying anywhere causes a change in idle. that area has a vacuum leak.
Possible IAC motor dirty or defective. Remove it. Clean the IAC plunger tip and the throttle body passages with air intake/throttle body cleaner spray can. Reassemble and start vehicle.

Feb 22, 2010 | 2002 Pontiac Sunfire

1 Answer

The check engine indicator of my 1998 honda civic is always on and the idling keeps at 1500 rpm. what's the possible problem ? is it possible that idling problem is cause of a defective computer box?

Generally this would be related to either a vacuum leak, an idle speed control motor or a throttle positioin sensor. The computer uses these things to determine where to set the idle at after interpreting all of the data "sensed". You can check for vacuum leaks with a can of carburetor cleaner by sprayng a small amount using the extension tube, near the vacuum connections and the throttle body and air intake components. IF you spray a small amount at a time you won't have a potential fire hazard. When carb cleaner is sucked in through a vacuum leak, the engine slows down & this will identify a spefic location or hose.

You could stop by your local parts store & probably get a free scan for the check engine light & that could indicate more readily what a problem could be. good luck

Jan 31, 2010 | 1997 Honda Civic

1 Answer

89 accord always idles at 3000rpm

Either the carb is misadjusted, or you have a vacuum leak somewhere letting in unmetered air.

Jun 02, 2009 | 1989 Honda Accord 4 Door

1 Answer

Engine missing

Hi again,

Appreciate the "Ask Me". With your indulgence, I would also be posting this reply in your original post here.

The fuel pump is inside the fuel tank as shown in diagram below.
Vacuum leak could of course cause poor performance on take off on engine speed below 3000RPM. Another indicator of a vacuum leak is slight above normal idling with the exhaust fumes hurting to the eyes.

Jul 26, 2008 | 1991 Daihatsu Charade

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