Can't Get Enough
Join Date: May 2000
Location: Bastrop, Texas
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Re: Bad Gas Milage Holley Projection Update
I'm no expert on holley projection systems, so I'm speaking off the cuff here. First what have you done, if anything, to troubleshoot the projection system itself?
Does the projection system determine the amount of fuel based on an O2 sensor? If so, is it within specs?
Does the projection have a TPS? If so is it within specs?
If you have checked all of your ignition specs as suggested above and the TBI is just dumping fuel into your engine, there has to be something telling it to do so, or a malfuntioning injector or something.
Its sounds like you have maybe two problems that are feeding off of each other i.e.ignition/advance problems and the TBI itself.
The way I normally troubleshoot is to start right in the middle and then work my way one way or the other depending on the test results.
IF you have and O2 sensor, use your meter and make sure its within the proper specs, don't they work on a scale of 0-5v or something like that? I would think that your holley instruction sheet would have information on the proper readings for this.
Then start testing each component til you confirm that all are good, my favorite saying when testing a new system is "new doesn't mean good"
Confirm each part and go from there, If you don't have an O2 sensor on your system, maybe you should consider installing one, it would be a good way to test your air fuel ratio and troubleshoot....
You've probably already done all this, but I was in a typing mood this morning, so....... [img]images/graemlins/smile.gif[/img]