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Car wont rev past 4500....help please!!

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Old 01-24-2005, 06:18 PM
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Default Car wont rev past 4500....help please!!

car and setup is: 94 Civic DX with SOHC VTEC with Greddy turbo kit.

Ever since i did the swap from b7 to z6 i cant get my car to run right. But the main problem is that my car wont rev past 4500 rpms. when it reaches this point it just sounds like its rev limiting. Doesnt buck or hesitate. Just limits. No CELs and i cant think of anything already. Can someone help me?
Old 01-24-2005, 06:19 PM
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check all of your grounds. a bad or non conductive ground can cause this problem.
Old 01-24-2005, 06:24 PM
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Default Re: Car wont rev past 4500....help please!! (d15b7racer)

would a lot of grounding a lot of things at one spot do this? Is this safe or unsafe? The one thats behind the thermostat housing has i think 3 or 4 wires. How many grounds are there normally too? this should help me quicker...
Old 01-24-2005, 06:26 PM
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yes the thermostat housing has 4 wires connected to one ring terminal.
Old 01-24-2005, 06:56 PM
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ballpark guess but it could also be the fuel pump.
had a car that wouldn't go past 3500 rpm, changed the fuel pump and voila.
Old 01-24-2005, 10:24 PM
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Default Re: (bluehatchy)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDMlyfestyle &raquo;</TD></TR><TR><TD CLASS="quote">yes the thermostat housing has 4 wires connected to one ring terminal. </TD></TR></TABLE>

yeah but what i meant was in addition to the wires thats on the stock wire harness i added grounds for my inline fuel pump, fog light relay thing, and something else that i cant remember i think. Could this interfere with a good ground?
Old 01-25-2005, 11:05 AM
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Default Re: Car wont rev past 4500....help please!! (d15b7racer)

bump for more help
Old 01-25-2005, 12:12 PM
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try changing the ECU ...
Old 01-25-2005, 12:33 PM
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check your fuel pressure.
Old 01-25-2005, 12:45 PM
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Default Re: (d15b7racer)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by d15b7racer &raquo;</TD></TR><TR><TD CLASS="quote">

yeah but what i meant was in addition to the wires thats on the stock wire harness i added grounds for my inline fuel pump, fog light relay thing, and something else that i cant remember i think. Could this interfere with a good ground?</TD></TR></TABLE>

as long as they are seperate components i wouldn't worry about it. This is why the ground for the ecu is different from the other grounds going to the ecu, such as map sensor ground and others, so that the signal doesn't get distrorted.
Old 01-28-2005, 10:25 AM
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Default Re: Car wont rev past 4500....help please!! (d15b7racer)

bump for more help......could bad ignition timing cause this?
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