2002 Pontiac Sunfire - 2.2L Surge With A/C On

[RODNEYY]

2002 PONTIAC SUNFIRE 2.2L

WHEN A/C IS ON AND SLOWLY ACCELERATE, THE VEHICLE SURGES BADLY. GIVE IT MORE GAS AND IT GOES AWAY. NO CODES PRESENT, HIGH AND LOW PRESSURES WITHIN NORM.

ANY IDEAS?

[brianp87]

Whats the fuel pressure reading during the surge?

[liljoe]

Wonder if the knock sensor could be picking up a compressor or bracket noise and retarding the timing?

[brianp87]

The extra load from the a/c sometimes magnifies another issue. Hard to say at this point givin the info we got its all a guess.

[steven kiser]

The surge may in fact be a stumble recovery or the compressor is overworking or it may be simply overcharged. It's a stretch but if it's overcharged and fighting because of pressure when it cycles off the vehicle may surge. Another issue may be a lazy I.A.C.. Just in case it may help in investigating which 2.2 it is.

[92zman]

i would cut for a miss that is not that bad untill the ac is on

[steven kiser]

i would cut for a miss that is not that bad untill the ac is on

possibly but no mention of a misfire or stumble during acceleration.............

[92zman]

Was thinking then the miss was not bad enough to show up till under a really heavy load.. something elas is the coil being bad. Have had a a/c coil go bad and be making the coumputer to off the wall stuff.