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Tech / General Engine Is your car making a strange sound or won't start? Thinking of adding power with a new combination? Need other technical information or engine specific advice? Don't see another board for your problem? Post it here!

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Old 05-22-2009, 02:42 PM   #1
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Engine lacks power at part throttle

I've asked this question a couple of times, but I've never gotten an answer.
So please shoot me some input, any ideas are appreciated.


I've got a '90 RS 305 TBI, and if I shift from 1st to 2nd and resume the throttle at maybe 1/4 throttle it feels as if the car is "missing" but not in an ignition sense, I think it is a fuel issue.

This only occurs at around 1/4 throttle, if it starts doing it and I step on it, the problem immediately goes away and it pulls.

What could this be? Could the injectors be plugged a bit so at low pressure fuel injection the pods don't work as well as they do at full throttle when they're spraying at full pressure?

What I immediately thought of was a low speed circuit of a carb, it feels as if that circuit could somehow be plugged or not working as well, because this only occurs at 1/4 throttle, but I'm not sure whether a TBI has these same circuits.

I appreciate any help given.
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Old 05-22-2009, 09:49 PM   #2
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Re: Engine lacks power at part throttle

Is the ses light on? if so is there any codes?
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Old 05-22-2009, 10:50 PM   #3
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Re: Engine lacks power at part throttle

check the throttle position sensor, sounds to me that it could be this
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Old 05-23-2009, 12:44 PM   #4
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Re: Engine lacks power at part throttle

No codes are being thrown, it's not a severe problem. I'd just like to figure out what it is.
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Old 05-23-2009, 10:08 PM   #5
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Re: Engine lacks power at part throttle

Another possible culprit I think could be the clutch. I think the "slip point", if you will, has perhaps moved farther toward me and it now engages, rather disengages (the disc) at a different point. Could this be the hydraulic fluid in the cylinder? Maybe the free play needs adjustment?
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Old 05-23-2009, 10:08 PM
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