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 RPM going crazy when engine is hot 
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Joined: October 26 2016, 7:00 PM
Posts: 1
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Post RPM going crazy when engine is hot
Hello. I have 1994 MAZDA MX-3 with rpm going crazy even I didn't step on accelerator.
please check youtube video link below

I already changed lots of parts to fix this problem but every time failed. I'm going crazy with this!
distributor cap, oxygen sensor, throttle position sensor, spark plug, valve cover gasket, coolant temperature sensor, oil changed.
and also cleaned throttle body and egr valve.

it was pretty nice right after cleaned egr valve yesterday. and today it cames again with engine check light turns on once and go out.
i also checked diagnostic but nothing comes out.

any idea can be helpful.. please help!

October 26 2016, 7:07 PM
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Joined: August 12 2016, 2:22 PM
Posts: 11
Location: Kent
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Post Re: RPM going crazy when engine is hot

First question, have you tried retrieving the diag codes?

Second, the RPM's is from the crankshaft sensor by the flywheel, have you checked or replaced this and also check the the wiring is ok going to it.

The quieter you are the more you can hear.

October 27 2016, 6:22 AM
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Joined: September 10 2001, 2:01 AM
Posts: 8704
Location: Spokane, WA
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Post Re: RPM going crazy when engine is hot
Have you adjusted throttle position sensor? You can't just install one and be done with it. It has to be adjusted according to repair manual.

Magnum s/s lines, strut bars, carbon fiber bezel, indiglow gauge, Sony Xplod, inverted c/f hood, SRD lower tie bar '93 GS SE '95 Cobra SVT #2722 '68 Charger R/T 440

October 27 2016, 9:50 AM
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Joined: May 19 2008, 3:54 PM
Posts: 363
Location: Ravensdale WA 98051
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Post Re: RPM going crazy when engine is hot
mitmaks is on the right path.
Here's the write-up on the throttle body cleaning and adjusting
and the second page

Wings on an MX3? What are you thinking?

92 RS BP05
(Previously owned by 2Fazed and then mrMazda92)

November 22 2016, 8:21 AM
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