Quote:
Originally Posted by Ccmano
No, that's not normal. It should pull like a freight train all the way to 7200 rpm (red line). Either your secondaries are not functioning or, as has been noted, the intake accordion connector between the air filter housing and the throttle body is collapsing at full throttle. First remove the connector and drive the car without it. If that solves your problem get the connector reinforcements from Haibeck ( www.zr1specialist.com) or a heavy duty connector from www.JerrysGaskets.com.
If not, you will have to go through the secondary injector system diagnostics. The first step is simple. Turn the ignition on but don't start the car. Does the secondary injector vacuum pump in the right front fender well (under the head light) run a) constantly b) not at all or c) cycle on and off every few seconds. "C" is normal, anything else and there is a vacuum issue with the system (the most common type of issue). Let us know what happens.
This is a must read on the subject to understand what is happening.
http://www.zr1specialist.com/HAT%20W...%20Working.pdf
Further diagnostics will require some specialized knowledge (available here) a factory service manual and ideally a Tech1 or similar scanner. Use the search function and do some reading here the subject. Also at the top of the Tech section are the "Solutions" stickies. Read up on the issue there.
Let us know what you find on your car. Many, if not most, of us have gone through the same thing.
H
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Generally that's good advice, however, if the ECM cal is stock, the rev limit is 7072-RPM and the power curve will flatten before that.
You also want to change the fuel filter then road test.
Inspect the air filter, replace as necessary