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Old 05-20-2005, 10:10 AM   #1
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DSI problem?

Yes, I have searched FF and FJ regarding the notorious DSI issue. I understand what it is, where its located, how to possibly fix it, but I have a question about the symptoms. While doing research, I have noticed that the actuator box located under the battery tends to make a hidious grinding noise letting you know that your DSI is fried. I have also noticed that people are mentioning busted clips on the intake manifold. I have no noise (except a rattley clutch) and I have yet to check for a busted clip, but I have noticed a lack of low end torque, and I seem to be missing that 5K rpm boost I used to feel.
I guess my question is then, does the grinding actuator box noise coincide with the clip being broke, or are these two separate DSI failure issues?


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Old 05-20-2005, 10:13 AM   #2
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Seperate DSI issues. Your DSI could be stuck on the long runners, but that won't account for the low end torque. My suggestion would be take it in for warrenty.
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Old 05-20-2005, 10:37 AM   #3
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If it's busted, it won't be stuck on the long-runner position - it's spring-loaded to the short (high-RPM) position, so if the linkage has failed, that's where it goes to.

Your lack of low-rpm umph is one of the symptoms of this - to check function, locate the DSI arm visually on the side of the manifold, then manually (your hand on the throttle linkage on the side of the TB), rev the engine to where the runners are supposed to switch over (5000-6000 RPM, depending on ECU variant and tune) and watch to see if it moves. If you have a helper, an alternative and less noisy way to test this is to locate the DSI arm visually as above with the engine off, then have the helper start the engine - as soon as it catches, you should see the arm move from the high-RPM/engine-off position to the low-RPM position.

And to answer your last question, the grinding noise can be caused by a broken actuator linkage - the thing keeps cycling, trying to make the runners switch over. Note that I say "can be caused" - I imagine that there is a failure mode that involves the actuator box just failing, and it may make a noise in that case, but I bet it would just go quiet if the actuator itself dies.

Last edited by Fordson; 05-20-2005 at 11:06 AM.
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Old 05-20-2005, 01:39 PM   #4
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I plan of visually checking the DSI when I get off work today. It will be interresting to know what the problem may be assuming that the cable is OK and the actuator box is fine. It is possible that I could be imagining a lack of power. I used to feel the runners switch at 5k but it dosent do that anymore.
Kinda off topic, but may be somewhat related. I did have a custom tune by Tom, I reflashed the stock tune for warranty work. When I reinstalled the custom tune, the car felt worse than it was stock. Kida sucks. I have emaild Tom a few times and he said that he would send a copy of the performance tune, but hasnt yet =\
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Old 05-20-2005, 02:21 PM   #5
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Your car's computer has to take some time to re-learn with the new tune parameters. Usually takes a few days for it to get everything smoothed out.
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Old 05-20-2005, 03:02 PM   #6
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does anyone have a pic of where this all is located?
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