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Car Forum / Mazda / Mazda Miata / June 2004RPM high
Hi, 1996 MX5 with 1800 motor. When I stop the RPM drops to 1200- 1400 RPM and sits at that for about 6 seconds then slowly falls to it's normal 750-800 RPM . I unplugged the electronic controller and blipped the accelerator and it drops immediately back to 750 - 800 without pausing at 1200- 1400 for several seconds . Something in the brains of the car is telling it to stop at the higher revs for a while before returning to normal. AC turned off. 2 questions . Does anyone know what might be doing it and why ? Did Bill gates have anything to do with the software in the CPU on the MX 5 :) Cheers and TIA  SignatureCol Col's law. Thinly sliced cabbage.. > Hi, > [quoted text clipped - 16 lines] > > Cheers and TIA I know at least the 1.6L M1s were meant to do this. There was a discussion on Miata.net of people actually upset that they lost this "feature" after doing some bolt-on mods. Don't sweat it. >>Hi, >> [quoted text clipped - 6 lines] > on Miata.net of people actually upset that they lost this "feature" after > doing some bolt-on mods. Don't sweat it. Sounds to me like your idle idjustment is set a little high. I don't know what you mean about removing the electronic box? On my 2002 1.8, you need to short the TEN pin to ground on the diagnostic connector and set the idle to around 1100 RPM or so, then remove the jumper on the TEN pin. The idle is adjusted on one side of the throttle-body with a stubby Philips head. I do not know if this applies to your 1996 car. Dana >>>Hi, >>> [quoted text clipped - 16 lines] > >I do not know if this applies to your 1996 car. 1996 needs to be set to 850-900 this way, IIRC. I believe the short delay is to keep the engine from stalling. But 6 seconds seems too long. Then again, I have a SC. Leon SignatureLeon van Dommelen :) Bozo, the White 96 Sebring Miata .) To reply to me, the word Miata must be in the subject. EXIT THE INTERSTATES (Jamie Jensen) > Sounds to me like your idle idjustment is set a little high. This is correct. Follow the instructions in the miata.net Garage for setting the timing and idle speed. The speed cannot be set properly without jumping TEN and GND in the diagnostic connector. SignatureLanny Chambers, St. Louis, USA '94C the alignment page: http://www.hummingbirds.net/alignment.html Actually, there is a way without using the jumper. Unfortunately, it might cause an ECU light (Which can be reset when you are done). The idea is to set theair bleed so that the IAC works properly. This translates to finding out where the IAC can no longer adjust the idle up and down in terms of air bleed settings. One this is known, you adjust the in the upper half of the range, to limit the ability of the idle to drop below an acceptable value. This seems to reduce or eliminate the idle droop. Eventually, the intake will still need to be cleaned out on 99 and 00 years. > > Sounds to me like your idle idjustment is set a little high. > > This is correct. Follow the instructions in the miata.net Garage for > setting the timing and idle speed. The speed cannot be set properly > without jumping TEN and GND in the diagnostic connector. > Actually, there is a way without using the jumper. > Unfortunately, it might cause an ECU light (Which can be reset when you are [quoted text clipped - 5 lines] > an acceptable value. This seems to reduce or eliminate the idle droop. > Eventually, the intake will still need to be cleaned out on 99 and 00 years. This just seems like a lot of work compared to shorting the TEN pin to ground and setting the idle speed properly. Dana > This just seems like a lot of work compared to > shorting the TEN pin to ground and setting the idle speed > properly. Especially since idle speed and static timing should be set together, and you need to jump the pins for that anyway. SignatureLanny Chambers, St. Louis, USA '94C the alignment page: http://www.hummingbirds.net/alignment.html Setting static timing is a bit of a problem on a spitfire ignityion. (No place to get at the secondary lead for #1.) > > This just seems like a lot of work compared to > > shorting the TEN pin to ground and setting the idle speed > > properly. > > Especially since idle speed and static timing should be set together, > and you need to jump the pins for that anyway. > Hi, > > 1996 MX5 with 1800 motor. > > When I stop the RPM drops to 1200- 1400 RPM and sits at that for about 6 seconds > then slowly falls to it's normal 750-800 RPM . My 2001, normally aspirated, have idle set at 850 rpm, but only when car doesn't move. If it has any speed readable by speedometer (above 5mph) then idle is 950 rpm. When I stop - it falls to 850 immediately. Regards, Kempi '01 silver,IL >> Hi, >> [quoted text clipped - 12 lines] >Kempi >'01 silver,IL THat's what I want mine to do again . Thanks for the help .. hmmm SignatureCol Col's law. Thinly sliced cabbage.. |
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