No Power Between 4000 and 5000
08-03-2010, 10:53 PM
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No Power Between 4000 and 5000
Someoe please help me!!!! i recently bought my 1987 Camaro Iroc-Z28. The guy i bought it from told me it had a completely rebuilt 350 with a mild cam and dart heads. When i test drove it, the car was amazing not a single problem. I picked it up a couple of weeks later and it didn't seem the same. Now it seems like the timing is high. i mean it spits and spudders between 4000 - 5000 rpms. i tried to adjust the timing and all i got was backfire and popping. So what do i do to get my beast back???? help me please o and when it gets to 4000 rpms the valves rattle. Sorry if it helps i am recently converted to chevy i use to be a ford guy
08-05-2010, 03:43 PM
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Car: 1991 Camaro Z28
Engine: 2002 SS LS1
Transmission: 6 speed
Axle/Gears: Auburn 3.42
Re: No Power Between 4000 and 5000
Any other mods? Stock tpi? What's your fuel fressure? Have you checked for vacumn leaks?
08-05-2010, 04:17 PM
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Car: 1990 Trans Am GTA
Engine: 383 HSR Profiler heads
Transmission: 700R4
Re: No Power Between 4000 and 5000
Does the car start to stumble at higher RPM?
Does your tach jump around like its a misfire?
Does your tach jump around like its a misfire?
08-05-2010, 08:35 PM
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No Power Between 4000 and 5000
No it runs great through first gear it once it has shifed into second that it does it...... the car pulls hard all the way through first then through second but once it hit 4000 rpm in second it spilt spudders, and its like it hits a rev limiter but the car has none... Thank You all for your help i really enjoy this car and just wanna get it back to where it was when i test drove it....
08-05-2010, 09:15 PM
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Car: 1991 Camaro Z28
Engine: 2002 SS LS1
Transmission: 6 speed
Axle/Gears: Auburn 3.42
Re: No Power Between 4000 and 5000
Call the guy u got it from, maybe it's something that happened before. Weird it doesn't do it in first. Makes u think it could have something to do with the vss signal. I had speedo problems when I had my tpi engine (lack of proper vss signal) it would spit and sputter intermittently as the signal cut in and out. The computer needs that signal at all times to run right.
08-05-2010, 10:31 PM
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Car: 1990 Trans Am GTA
Engine: 383 HSR Profiler heads
Transmission: 700R4
Re: No Power Between 4000 and 5000
Mine had a similar problem
check all your ignition parts.. Plugs, wires, cap, rotor, test your coil and the pickup in the distributer
Clean all the connections going to the module and apply a little die electric grease to the terminals on the connecters (even if they dont look dirty.. clean and grease every connection)
Mine was the connection between the pickup coil and the module
It worked wonders for me
Good luck!
check all your ignition parts.. Plugs, wires, cap, rotor, test your coil and the pickup in the distributer
Clean all the connections going to the module and apply a little die electric grease to the terminals on the connecters (even if they dont look dirty.. clean and grease every connection)
Mine was the connection between the pickup coil and the module
It worked wonders for me
Good luck!
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