Question about 1992 Mazda MX-3

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Idle problems I have a 92 Mazda MX-3 with 180,000 miles. It idles really bad where it will start to rev up on its own and then drop back down then rev back up again. The check engine light is on, but I don't know how to check it.

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I don't know, but i'm pretty sure there is a throttle position sensor of sorts on there. that sounds like the reason. as far as that and your check engine light, go to autozone or advance auto and get them to check it for free. or go to your local garage and have them read it (may cost you, may not). if you go to one for free be prepared, take a pen and paper to write down whatever the codes are. this way you can have the info for your mechanic or you can fix yourself.

Posted on Sep 23, 2008

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I hooked my 95 Mazda mil up and says I need O2 sensor for bank 1 and 2 and also says I need engine speed circuit not sure wat to replace and wats really messd up please help


First is all always write down the codes you have present, it helps in closing down on the problem. I am assuming you have a 95 Mazda Milleinia

1. Start and run the engine and monitor the oxygen sensor signals and see if this sensor has bad readings still. Check for an open or shorted wire between the sensor and the Engine Control Module (ECM) if the signal is dropping out.

2. Listen for an exhaust leak in the area of the oxygen sensor, the leak could allow oxygen in to the exhaust and skew the sensor readings.

3. Inspect the ECM and ECM connector for signs of something that has been spilled on the ECM. Is the engine idling too high or too low then check this:-
1. Unplug the idle air control valve and turn the air bypass screw in to see if it will idle down. If it will idle down, adjust the idle speed to around 500 RPM's and then plug the idle air control valve back in.

2. If it still idles high, remove the air boot from the throttle body, block the air bypass ports with duct tape, hook the air boot back on and start it. This should make it not idle at all or just barley idle. If it does, the problem is in the idle air control valve.

3. If blocking the air ports doesn't cause it to idle down, the throttle plate must be sticking open. Clean the throttle plate really good and back the throttle stop screw off and then see if it idles down.

4. Verify the coolant level is not low and that coolant is circulating through the idle air control valve. Tech Tips: This idle air control valve is two valves in one. It is a fast idle thermo valve on one side and a duty cycle idle air control valve on the other.

Mar 30, 2015 | 1995 Mazda Millenia

2 Answers

I have a 1989 Mazda 323, when cold engine idles very high, when very cold it idles so high that rev limiter kicks in, and it revs up, limiter kicks in, revs up limiter kicks in, once it warms up idle drops...


Have it looked at by a dealer,iam not sure here but i think you have a vacumn leak like the feed pipe to the servo split but really you need a mechanic who works on these cars day in day out and they will go straight too the problem for you

Jan 18, 2015 | 1989 Mazda 323

1 Answer

My mazda mx5 <1600cc>at normal operating temperature idles at 800 revs,after about 20 seconds the revs drop to 400 revs,after 5 seconds they return to 800 revs,this problem is continuous at idle.This...


Hi,
Sounds like a tune up is in order.
You can mask the problem by changing the fuel filter and spark plugs.
Also there is a small adjustment screw at the throttle linkage. Open the hood and stand close to the battery. Have someone rev the engine and look for the circle or half circle looking spring like mechanism.This is your throttle. Take a small screwdriver or other wrench [ some have different adjustment screws] and simply turn the screw you will see as the adjuster in about 1.4 turn until you are happy with the idle.

Aug 12, 2011 | 1992 Mazda MX-5

1 Answer

92 escort revs on its own while sitting at a


disconnect the IAC, does the idle drop? if so the IAC iws most likely not the problem, to be sure remove it (2 8mm machine screws) and block it of with a peice of paper, if the idle drops the IAC is stuck on, if it doesn't drop you have a vacuum leak

Mar 25, 2010 | 1997 Ford Escort

2 Answers

Ive a mx 5 mazda 1992 and ive got a problem with idle on tick over.


when my mazda mx5 is warmed up the engine idles at 800 revs after about 20 seconds the revs drop to 400 revs,after 5 seconds they pickup again to 800 revs,this pattern is continuous.HELP!!!!!

Nov 29, 2009 | 1992 Mazda MX-5

2 Answers

A 92 Mazda mx3 with a 1.8ltr v-6 while at an idle goes from 1500 rpms to 900 rpms and back up and down but not while driving, how do I get it to idle correctly


change the idle air control motor and check to see if the ports are clogged, this too will cause surging idle. the idle air control motor is located on or near the throttle body

Aug 04, 2009 | 1992 Mazda MX-3

1 Answer

Revs drop coming to standstill


Here is the cause 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.

May 12, 2009 | 1999 Mazda 626

1 Answer

Idle problems


With the engine running at normal temperature, put a bent paperclip between gnd and ten in the diagnosis box (
Left side of engine bay above the shock tower)
Under a plastic bung on the throttle body where the big black tube fits in near throttle cable, turn the screw until the revs are about 800-900 rpm ,Remove the clip and your done!.




Jul 06, 2008 | 1991 Mazda MX-5

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