youngtrip87
Aurora Newbie
There is no such thing as paranoia. Your worst fears can come true at any moment.
Posts: 6 
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Post by youngtrip87 on Jul 15, 2015 0:50:32 GMT -6
Ok here goes nothing. I recently have encountered a problem with my Aurora. When i take off from a stop the engine sputters and lags out untill i hit about 20-30 mph then it pick back up all power. If i try driving up a hill you better get in line because i hit 10 mph driving on any incline it seems like. I have a CEL on and i had the codes ran. 3 issues popped up. {1} Cylinder 1 Misfire. {2} Random Cylinder Misfire. {3} Knock Sensor. I immediately checked out all the coils to make sure the where throwing sparks and working properly. Changed the spark plug in cylinder 1. I have yet to mess with the knock sensor due to its ugly placement right under the intake. My question is after checking and replacing the coils and spark plug. would the knock sensor really have that bad of an effect on the firing? I assumed it would have been the plugs , wires, and or coils. Any information would be greatly welcome.
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youngtrip87
Aurora Newbie
There is no such thing as paranoia. Your worst fears can come true at any moment.
Posts: 6
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Post by youngtrip87 on Jul 15, 2015 19:25:33 GMT -6
ok so heres an update. i had my brother run his GM Tech 2 scaner on it today. apperantly he believes its the MAF sensor. the car will run fine except when under anyload exceeding 5%. i am picking up a MAF sensor tomorrow ill keep you updated.
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tigger
Administrator 
Posts: 2,844
Staff Member
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Post by tigger on Jul 16, 2015 0:19:10 GMT -6
I assume you tried cleaning it first? That's a fairly expensive part, isn't it?
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RCA1186
Administrator
Rob
Go Pack Go!
Posts: 4,837
Staff Member
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Post by RCA1186 on Jul 16, 2015 7:03:16 GMT -6
I'd start with plugs and wires. These engines also seem to only like AC Delco or NGK plugs
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youngtrip87
Aurora Newbie
There is no such thing as paranoia. Your worst fears can come true at any moment.
Posts: 6
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Post by youngtrip87 on Jul 18, 2015 21:46:34 GMT -6
Ive changed plugs wires and got 4 MAF sensors from junk yard. still lose power when hitting an incline or taking off from a stop. I should be able to push the petal to the floor and take off. if i push the petal to the floor i get a slow gradual take off. i am lost.
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Post by sall on Jul 19, 2015 7:22:19 GMT -6
I would chnage all the plugs and wires first(you mentioned changning one plug then later said plugs, so not sure what you have done). Have you checked fuel pressure at the rail? What is your long term fuel trim?
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youngtrip87
Aurora Newbie
There is no such thing as paranoia. Your worst fears can come true at any moment.
Posts: 6
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Post by youngtrip87 on Jul 19, 2015 14:29:00 GMT -6
OK list as follows is everything i have done.
Changed all spark plugs and wires.
Changed all coil packs.
Changed MAF sensor.
Changed Fuel Filter.
Unhooked O2 sensor before the cat. drove it still same issue.
Unhooked cat from engine. drove still same issue.
I am going to orileys now to get a fuel pressure gauge to test the system pressure.
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Post by sall on Jul 19, 2015 18:45:26 GMT -6
You are looking for 48-55 psi with system primed(key on/engine off). Unless you have a '95 it is different IRRC. You should also check for high LTFT though as well with a scantool.
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