95 Camy 1MZ-FE hesitation at WOT - Toyota Nation Forum : Toyota Car and Truck Forums

thsettle · 12-15-2011, 11:26 AM

I have a 95 Camry 1MZ-FE -- once the engine is warm (up to operational temp) if I hit the gas and get the RPM's past 4,000 -- there is a big hesitation /like a misfire. The car surges/ hesitates rapidly (like machine gun)-- it seems like it wants to go but does not. If I get off the gas and go back to under 4,000 RPM car runs fine. Idles fine -- plenty of power -- only a problem under load past 4,000 rpm. No codes being thrown or pending. Plugs changed 32,000 ago -- gas mileage 26 MPG on highway -- at 80 MPH

This would be fine but if you have to pass another car -- is a big problem.

Any ideas on how to find the problem -- where to start.

***BMR*** · 12-15-2011, 12:46 PM

First guess is air filter needs changing. To test, try taking the filter out and see if that fixes it.

Second guess is fuel pump is marginal.

thsettle · 12-15-2011, 01:55 PM

Thanks for the fast reply -- I will check both.

Found one bit of info -- The 94-96 1MZs use a vacuum modulated EGR system that cuts off at 4100-4200 RPM. I believe the EGR VSV vents to atmosphere during that time to bypass the EGR system? Not sure if this is correct?