Question about 1992 Honda Civic

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High idle at start then oscilates after warm

I have a 92 civic d15 manual when i start from cold engine runs between 2500-3000 rpms for about 2 min then starts oscilating between 1000 and 2500rpm it doesnt effect acceleration but does make the car **** at low speed/low rpms i had a small intake leak and have fixed it and am stumped at what is wrong now. Any help would be appreciated
Darrel

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It is a vacuum leak for sure, but where? Try buying a can of aerosol carb cleaner with a straw and spraying it in different areas and listening for a change. Also, a mechanics stethoscope with just the tube is great for pin pointing vacuum noises. Without any hesitation, I would put a new PCV valve in just because this has caught me on Hondas so many times and they are dirt cheap.

Posted on Mar 11, 2009

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TPS sensor is posibl problem

Posted on Mar 11, 2009

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1 Answer

92 chevy idles real fast on cold start up, then after run warming up runs fine


Not an uncommon issue for one to idle fast while cold but , 2000 rpms is a little higher than normal. May want to check the engine coolant temperature sensor for proper voltage and the coolant level. Also, check for small vacuum leaks around the throttle body gasket.

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High Idle at Start Up


This sounds like the RPM may be a little high, but normal operation is called a "cold start routine". Like the old fashion Choke, the "cold start routine" is suppose to increase the RPM for several minutes and then decrease to running idle speed. This will engage in each "cold" start, but not on a warm engine. It is designed to do this.

Usually when an engine runs higher RPM than it is set for, it means extra air is entering the engine from somewhere. Using a spray water filled bottle, go around seams and also spray vacuum lines and the EGR pod while the engine is running. Any openings will draw in the water and affect RPM. Then you will have found the leak.

Now you can look up you exact engine on the Web and find out 2 things. If it has a 2 piece intake manifold and if it has intake Manifold runners. The 2 piece design often failed when the gasket holding the 2 halves started dissolving. The intake runners, could stick out of position and make RPM higher.

Now aside from these 2 items, you might get a Code showing that the engine is running lean. This would actually not be showing the lack of fuel, but the overabundance of air coming from the leaks.

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I have a 92 honda civic d15 manual and after starting my car and driving 3-5 miles or when the car warms up the car will spit n sputter and stall out:( than I can't start it back up until it's cold.... I...


good advice is to always run the fault codes when the engine is playing up. After all that is what they are there for. They save so much money and frustration. So run the fault codes and fix the faulty sensor .

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On a cold start i have no high idle for warm up


coolant temp sensor and intake air temp sensor would be the next to check.intake air temp sensor is in the air intake tunnel between TB air air box. when running is there a DTC? by disconnecting the coolant temp sensor you put the ecm values at default try that if it corrects your issue replace it.(it will turn your check engine light on but you can clear later by disconnecting battery)

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Check the water coolant thermostat. If it is stuck in the "open" position you are heating up all the water in the coolant system and this will take time. The thermostat keeps the water in the engine until warmed up to almost normal running temperature, only then does it allow the coolant to enter the radiator.

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Surge in idle when brakes applied or after driving..


block off vacuum hose to brake booster and see if idle returns to normal if it does you need new brake booster has hole in diaphram internally some times slight hissing noise is evident in cab when pressing brake pedal to section where engine surges or idles high. also check for fuel leaks from hoses if you can smell fuel in engine bay while running and engine warm some leaks only leak while running and hot

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Good idling speed


This all depends on when you are reading the rpms becaus ethe engine will run faster when you first start it to bring it up to operating temperature than it will drop down to about 700-800 when the engine is warm. i recommend letting your engine warm up, than read your tach and if it is still reading 1000 rpms than reduce it down to 700-800. your ECU will compensate for this when your engine is cold.

this could also be a possible bad Idle Air Control Valve because your engine speed should be regulated by the computer.

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also check the fitvalve... may need opening and cleaning the spring mechanism

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it might just be your timing i had the same problem with my 94 hatch did have any power on first or second just had a friend adjust the timing and werks just fine.

Oct 02, 2008 | 1993 Honda Civic 4 Door

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