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so not only is this bugging the crap out of me but also the local mechanics. i want every gear head on here to put there thinking caps on good and tight and lets see if i can get some thoughts on this
96 impala, raiss intake, aftermarket maf.
car idles perfect runs smooth, drives great no problems at all exept when you turn the ac on. when you are just cruising down the road over 1500 rpm with the air on there is a feeling like a missfire every 4 seconds. even if you are at 2300 rpm the feeling is stronger but it is still every 4 seconds, ac off you cant feel it miss at all. if the air is on and you are accelerating you dotn feel the miss at all either
so we hooked the scanner up and there is no missfire on any of the 8 cyl. infact everythign on the scanner looked good exept the fuel learn ( i think thats what he called it) droped to no every time you felt the miss then went right back to yes. he is not thinking it is a miss though since the line was perfectly strait for all 8 cyl. its like somethign is telling the computer to turn off the fuel learn for that split second
so far i have put in new plugs, wires, sent computer out and had it reflashed ( so they say) did the egr check. there is no cel on so that dosent help much. he is beliving it is the computer but he had a spare one laying around out of a caprice i do belive, i pluged that one in and the cel came on rpms were 1000 off and it still had the same miss feeling.
any input would be appreciated b4 i go and buy a opti and that isnt even the problem
96 impala, raiss intake, aftermarket maf.
car idles perfect runs smooth, drives great no problems at all exept when you turn the ac on. when you are just cruising down the road over 1500 rpm with the air on there is a feeling like a missfire every 4 seconds. even if you are at 2300 rpm the feeling is stronger but it is still every 4 seconds, ac off you cant feel it miss at all. if the air is on and you are accelerating you dotn feel the miss at all either
so we hooked the scanner up and there is no missfire on any of the 8 cyl. infact everythign on the scanner looked good exept the fuel learn ( i think thats what he called it) droped to no every time you felt the miss then went right back to yes. he is not thinking it is a miss though since the line was perfectly strait for all 8 cyl. its like somethign is telling the computer to turn off the fuel learn for that split second
so far i have put in new plugs, wires, sent computer out and had it reflashed ( so they say) did the egr check. there is no cel on so that dosent help much. he is beliving it is the computer but he had a spare one laying around out of a caprice i do belive, i pluged that one in and the cel came on rpms were 1000 off and it still had the same miss feeling.
any input would be appreciated b4 i go and buy a opti and that isnt even the problem