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 Important  Tuning
Tips Pages

Click the below page links for in depth  info for performance tuning the GM Tbi fuel injection system: 

Trouble Codes

Tune Up

Bolt On GM Tbi Mod's

Fuel Pressure Tuning

Oxygen Sensor Tuning


Updated 7/05/04 - Hit your browser's 'refresh' button!


Did you miss the article? Check out Ten Magazines 'Trucks' magazine article on our parts - Click Here

Don't just tune it - Power Tune it!

Note: These pages are to help you understand, diagnose, and/or to gain back and exceed the original performance of your tbi engine.  We cannot, however,  help diagnose particular problems with your vehicle without actually looking at it ourselves. We understand that you may be glad to finally find a place that expertise's in the GM TBI but , again, diagnosing a problem over e-mail or the phone is many times impossible. 

Our GM tbi tech tips will cover from the basics (that we all should read) to the "Wow I didn't know that!

Note: If the plain language rambling below starts to bother you  - Read it anyway.  If anything, it will make you a better reader!

Just in case you want to know the truth - here are the cold, hard, factory engine spec's.Ouch.

L03 and L05 GM Tbi Truck Engine Spec's




 Camshaft .050" I/E - Lift I/E - LSA

Injector Size lb/hr




 179/194 - .350"/.385" - 109





 194/202 - .385"/.403" - 112


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