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2001 GT40 is "surging" after running at high rpms for no longer than 5 minutes. The more the rpms the sooner the problem appears. It will run all day fine at a lower rpms (say below 3000). So far replaced relays, fuel filter, plugs cap & rotor. Any ideas? No engine lights, all fluids are fine. Next step i can think of is anti siphon valve on tank, fuel lines, and then high pressure fuel pump. Its almost like the engine is "starving" for fuel at a higher rpms or under load.
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I would start by checking fuel pressureOriginally posted by Danny Roberts View Post
If OK check all sensors and idle air bypass valve and clean throttle body while you on it.
Check the vacuum lines.
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Which lines should I be checking? Sorry I'm not familiar with the entire fuel system with the FCC and allOriginally posted by Peter6000 View PostComment
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I have this same boat and had the same problem. I threw a bunch of parts at it and it ended up being a clogged fuel injectorComment
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There are only 2 vacuum lines from the intake manifold to the MAP sensor and to the fuel pressure regulator.Originally posted by Danny Roberts View Post
A bad fuel injector could be the problem you can test these without removing them.
Use a fuel pressure tester to monitor pressure and turn ignition on
Pressure builds up to 36psi or so
The pressure should stay above 30 for at least a few minutes or you have a leaky injector.
Now you need a external 12v source and connect it to the first injector for 1 sec.
The pressure will drop a certain amount.
The drop should be the same for all injectors.
Or run the engine and use a stethoscope to listen to each injector if on is not kicking it's bad.
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