1993 toyota camry 4cyl continuous rpm drop and rise

Asked by Bkp91 Oct 07, 2014 at 11:57 AM about the 1993 Toyota Camry LE

Question type: Maintenance & Repair

The engine on my 1993 camry 4cyl will not exceed 2500 to 3000 rpm.  When it reaches
that mark the rpm fall and immediately rise again. This happens about twice per second.  
The car starts and idles well. It will accelerate and shift properly below that rpm threshold

2 Answers
143,705

T_S_T answered 9 years ago

Check the fuel filter,and if it is good,may need to check the fuel pressure,may be fuel pump,going bad.

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Matt answered 5 years ago

Iac (ideal air control) is more common to go bad the magnet breaks up over time causing it to stay open and not letting the sensor close the valve at full temp with give a bad ideal and knock tell it dies

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