C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

91 383 missing problems.

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Old Apr 18, 2005 | 09:06 PM
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Default 91 383 missing problems.

ok what else can cause a dead miss at 12-1500 rpms on a 91?I have changed the pickup coil,secondary coil,plugs,wires,cap,rotor,and the ign. control modual..
the motor is a new 383 and I cant get this problem fixed no matter what I try.I have gone over the firing order 5 times and they are all right.I ran a compression check and all the cylinders had good compression.I have played around with the timming and realy I got no change.the car falls on its face at 5,000 rpms too.after 5 grand theres nothing.it acts like it hits a wall. the cam was degreed in so thats not the problem.I cant find any vacume leaks at all either.
could it be a ground off the computer somewhere or something????
this car is driving me crazy and I am about to my witz end with it.
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Old Apr 18, 2005 | 09:55 PM
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sounds like you have some real tight valves... readjust the rockers.
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Old Apr 18, 2005 | 10:04 PM
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I did already.they are set at zero lash with plenty of preload.
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Old Apr 18, 2005 | 11:31 PM
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hm.

TPS? O2 Sensors? Have you run a scanner on it when it does this?
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Old Apr 19, 2005 | 12:50 PM
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ya,everything checks out fine.I had the ignition analized and all was good there too.
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Old Apr 19, 2005 | 01:13 PM
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first let's have some info about your car ie mods. what intake are you running?
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Old Apr 19, 2005 | 01:14 PM
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stock tpi intake with a bit of port work.224-230@.050 comp cam
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Old Apr 19, 2005 | 01:25 PM
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OK that explains your car falling on its face @ 5K, now did you get your car tuned after the cam because it could be surge between 1200 and 1500
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Old Apr 19, 2005 | 06:46 PM
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ya I got a chip burnt for it but it wasnt dyno tuned yet.
the stock intake should allow the motor to turn 6000 shouldnt it?
the miss is not a surge it was a dead miss but I got that figured out.it was running real lean...the 4500-5000 problem is still there though.
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Old Apr 19, 2005 | 10:46 PM
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Originally Posted by ar91c4
ya I got a chip burnt for it but it wasnt dyno tuned yet.
the stock intake should allow the motor to turn 6000 shouldnt it?
the miss is not a surge it was a dead miss but I got that figured out.it was running real lean...the 4500-5000 problem is still there though.
No, a long tube runner TPI intake creates huge pumping losses around 4750 RPM which prevents the engine from making power to 6K. Switch to a short runner intake and then your engine will pull to 6K.
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