98 Camry bumbling when A/C on and transmission in "D" or "R"
My 98 Camry (105K mileage) has a bumbling problem when A/C is on and transmission in gear while stop in traffic. the engine rpm will up to 750 and drop to 500 and repeat itself. Bum will stop either transmission change to N or P or turn off the A/C switch. It runs fine in highway when RPM is more than 1000. I clean the IAC, idle Air Control valve, which no helps. change spark plugs, air filter and gas treatment but problem still. The air hiss sound from IAC is louder when A/C switch and tranny is in "D" and "R". I think something is confusing the ECU so it send signal to IAC unit for more bypass air which drop the rpm to 500 and it stop the A/C unit, then RPM increase to 700-800, so A/C is ON again which caused the engine bumling. RPM drop .... repeat until traffic light change to green and add more gas and run.. is the IAC is out of range and need replace? the cold start is fine and smooblingth without any problem. :mad:
It is bad for A/C since it is on off too frequently when stop in the traffic and feel the car will die or surge ( unsafe feeling) |
Originally Posted by peterliu2000
(Post 39796)
My 98 Camry (105K mileage) has a bumbling problem when A/C is on and transmission in gear while stop in traffic. the engine rpm will up to 750 and drop to 500 and repeat itself. Bum will stop either transmission change to N or P or turn off the A/C switch. It runs fine in highway when RPM is more than 1000. I clean the IAC, idle Air Control valve, which no helps. change spark plugs, air filter and gas treatment but problem still. The air hiss sound from IAC is louder when A/C switch and tranny is in "D" and "R". I think something is confusing the ECU so it send signal to IAC unit for more bypass air which drop the rpm to 500 and it stop the A/C unit, then RPM increase to 700-800, so A/C is ON again which caused the engine bumling. RPM drop .... repeat until traffic light change to green and add more gas and run.. is the IAC is out of range and need replace? the cold start is fine and smooblingth without any problem. :mad:
It is bad for A/C since it is on off too frequently when stop in the traffic and feel the car will die or surge ( unsafe feeling) |
Thanks. I will try tap the EGR to see the result and remove EGR to clean later.
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Originally Posted by peterliu2000
(Post 39802)
Thanks. I will try tap the EGR to see the result and remove EGR to clean later.
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Originally Posted by Glenn8963
(Post 39810)
just be sure to disconnect the EGR valve after because if you don't, it will stick open again. i highly suspect its carboned up........
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