1993 z28 stuttering
Thread Starter
Teching In
Joined: Dec 2012
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1993 z28 stuttering ok before I start here let me list out the mod and what I have done
1993 z28 lt1
58mm TB
gm847 cam
longtubes
heated o2
slp cold air intake
tune
24lb injectors
Im having a problem with the car cutting out and not running right at less then WOT. The car runs great for about 30min+ of driving and then the problem starts up. if you kill the car and let in sit for a min or so it runs fine again for a while. I cammed it about three weeks ago and it was running fine until a few days ago. I have replaced both 02s,temp sensor in the waterpump, checked the plugs and wires and now ive looked at the computer data with my laptop and MAP is fine and reads ok TPS reads fine but the 02 sensors read weird they keep goin to 30.00 mv and the cars cuts out kill it the read ok and then all the sudden its back at it again it will even cut out with both 02s unplugged and the is the seconds set of o2s
any help would be much appreciated
1993 z28 lt1
58mm TB
gm847 cam
longtubes
heated o2
slp cold air intake
tune
24lb injectors
Im having a problem with the car cutting out and not running right at less then WOT. The car runs great for about 30min+ of driving and then the problem starts up. if you kill the car and let in sit for a min or so it runs fine again for a while. I cammed it about three weeks ago and it was running fine until a few days ago. I have replaced both 02s,temp sensor in the waterpump, checked the plugs and wires and now ive looked at the computer data with my laptop and MAP is fine and reads ok TPS reads fine but the 02 sensors read weird they keep goin to 30.00 mv and the cars cuts out kill it the read ok and then all the sudden its back at it again it will even cut out with both 02s unplugged and the is the seconds set of o2s
any help would be much appreciated
Thread Starter
Teching In
Joined: Dec 2012
Posts: 7
Likes: 0
I just checked the fuel psi and it was 42 not running and 48 or so running with the vac line off seems ok to me The ICM is spaced away from the head
Last edited by z28rssscamaro; Apr 22, 2013 at 04:07 PM.
id go over your plugs again, also try just disconnecting the battery, i know it seems like a long shot but simple things first before spending a bunch of money, my car had a misfire and such wasn't sure what it was, all i replaced was one o2 sensor and disconnected the battery for 30 mins and its good as new now.
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Verdad Gallardo Thread Starter
Teching In
Joined: Dec 2012
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ive looked at the fuel psi while driving and it stay where it should be. i had to replace my alt last night. the bearings in the alt have been making noise for a long time. now i hear some exhaust leaks in the headers. im going to fix that then i will plug my pass side o2 back in. ive keep it in open loop lately because is ran so bad in close loop. ill post an update tomorrow .....hopefully this fixes the problem
