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Engine Reving to high at idle 96 1.3

Nothing has been played with It just slowly started to idle higher.

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  • hilow Mar 04, 2009

    Looks like it may be related to the electronic air bleed mounted on the drivers side inner gard.

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Sounds like the intake gaskit to me....but i could be wrong i'm not big on mazda

Posted on Mar 03, 2009

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2 Answers

High reving engine


Probably a sticking throttle cable - when this occurs, look under the hood to see if the throttle lever on the throttle body is fully in the rest position.

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Over reving


Can be a number of things (check all of these):

  1. Stuck throttle linkage or accelerator pedal;
  2. Loose butterfly on throttle body;
  3. Stuck or malfunctioning idle air controller;
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Oil gauge drops low at idle


Low oil pressure at idle can be caused by an engine with worn rod or main bearings due to (usually) high mileage . This however does not mean the engine is still not serviceable as long as the oil pressure is low only at idle. The pressure should at minimum get into the normal range at anything above idle speed.Not much oil pressure is really necessary at LOW speed. At low speed, as long as there is oil getting to the bearings, even at low pressure, you are OK. In a high mileage engine the oil pressure is often low at idle simply because the oil pump is turning slowly and cannot maintain higher pressure between the larger than normal crankshaft and bearing clearances. As speed increases the pump turns faster and supplies more oil and the pressure should go higher. Low pressure as long as it is only at idle is not a problem. However at higher speeds the pressure should be in the normal range. Such a worn engine can benefit from higher viscosity (thicker) oil such as 20W-50 in above freezing weather and 10W-40 in winter. That will increase idle pressure and the thicker oil film maintains a better film between the worn parts

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My 1991 Buick Regal (3.1 engine) use to start a high RPMs and then slowly, as the engine warms up, the RPMs would come down to about 800, which is the normal. However a few weeks ago, it started to start...


Hi,
You need to get your engine coolant thermistor checked and tested. This is what tells the ECM when the engine temperature is at normal working temperature and turns the idle down.
But when the idle won't come down from cold to warm this is usually the main fault.
Hope this helps.
Thanks
Jason

Jan 28, 2011 | 1991 Buick Regal

2 Answers

1987 Chevy Cavalier RS Reving issue.


Hi there;
It sounds a lot like you have a vacuum leak, I'm assuming your car if fuel injected. If there is too much air getting into the engine from a broken vacuum line of possibly a stuck Idle air control motor the computer has to keep adding fuel to make sure the fuel to air mixture is right. the end result of this is the engine RPM's keep going up untill it reaches the propper mixture.
If you are under the hood with the engine running you may hear a "HISSING" noise. It may be loud, it may be subtle, so you might need to listen fairly close.
The job of the idle air contol motor is to bring the idle of the engine down to the proper Idle rpm in a controlled manner without the engine stalling from a sudden loss of fuel from letting your foot off the pedal, after a while these start to get sticky or weak & don't work propperly so this may be the cause as well.
If you don't hear any hissing & can't find a vacuum leak, you'll need to suspect the Idle air control motor.

Good Luck I hope this helps
Farrout!

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1 Answer

Not reving high on cold start


Here is the most common cause of surges and stalls and low idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk 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

Feb 06, 2009 | 1998 Volkswagen Jetta

1 Answer

Engine high rev at stop and slowly goes to idle speed.


I've got Hyundai Lantra 1.6 year 2000. It's take time to start when it's hot. When I start my car it revs at about 2k-3k rpm. It also does it when I come to a stop. When I come to a stop it will stay at a higher rpm than that of idle speed. It drives ok when on freeway but uses more petrol. I have changed the water & petrol pump but no luck

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