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Old 01-04-2003, 07:54 PM
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Post Throttle bog

I've installed a 95 lt1 350, into my 34 chev last year. After alot of brain drain about electronics, and electrical (I still get flashlite bateries in backwards) I finally got it finished. I'm using a 1993 ecm to opperate the fuel management. The engine runs well at idle but seems to stumble off idle (bog), and then settles down. Then buy increacing throttle somemore ,it stumbles again, and then settles down.
I,m wondering if it could be throttle position sensor. ANy ideas

Thanks Coupe101
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Old 01-04-2003, 10:33 PM
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Question

Does this same ECM also control the ignition timing advance?
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Old 01-04-2003, 10:49 PM
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Yes it doe's
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Old 01-05-2003, 05:54 AM
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Arrow

Well...I haven't been fortuante enough to work with the LT-1 yet, but it is basically the same as a TPI in operation and diagnostics.

I assume that you retained the test port and have a functioning MIL lamp in your system, but haven't the scan tool to access fault codes or data streams.

You can test a TPS on the car with a digital multimeter and also having an analog multimeter makes it easier to make a sweep test.

Once you have established your base idle RPM (and the intial timing is where you want it), the TPS should show a base voltage of 0.54V. The TPS is adjustible and you can crank it to around 0.64V usually without tripping the MIL. This will give you better tip in and overall throttle response. Akin to juicing up the accelerator pump on a carb.

On a TPI, you access this voltage reading through the blue wire at the TPS connection (probe). You now cut the engine, turn the key to the run position and rotate the TPS throughout it's range while closely watching the volt meter. If you see any abrupt change at any position, you most likely have a bad sensor. The analog sweep is easier to see with the eye as the digital is so quick, you may not notice the glich.

Other things that may cause a tip in problem is the MAP sensor (speed density) or fuel pressure/ delivery.

Hope this helps.
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