What would cause TBI to run rich?
The TBI system is programed to run richer when the engine is cold. Your ECM might think your engine is cold and making it run rich (it’s like the choke on a carb).
What is the typical fuel pressure on a TBI system?
The fuel pressure regulator is set for approximately 12 psi (30 psi on ’94 & ’95 BBC trucks). With a service range of 9 to 13 psi being considered good.
What causes a throttle body to flood out?
This is most likely a throttle body component failure, a fuel line leak or a fuel injector that is always active. It might be a good idea to have a professional mobile mechanic complete a fuel system inspection to determine what is causing this problem.
What are symptoms of bad IAC?
When the idle air control valve fails, it inhibits the flow of air through the engine. When the car can’t receive air, it leads to engine stalling. The severity of this symptom can range from occasional stalling at first, to stalling immediately after ignition.
Why does my TBI 350 engine run rich?
Thank you. The coolant temp sensor might be shot. The TBI system is programed to run richer when the engine is cold. Your ECM might think your engine is cold and making it run rich (it’s like the choke on a carb). i assume this is in your cruiser, right?!
What should the fuel pressure be on a TBI system?
Fuel System Checks. Fuel Pressure is critical to the operation of a fuel injection system. Always check to insure that you have the proper fuel pressure. Fuel pressure should be a constant 10 – 15 PSI on a TBI fuel injection system and is typically around 12 – 13 psi.
Can you change the throttle body on a 350 TBI?
Modify the throttle body. This one pretty cheap but does require removing the throttle body. UTIMATE MODS . Stock 42mm TBI units flow around 450cfm which if you look at http://www.carburetion.com/calc.asp a stock 350 even with a cam upgrade to increase the powerband to 5500 rpms isn’t going to use much if any more than that stock throttle body.
When did GM start using throttle body injection?
So Just what is TBI, stands for Throttle Body Injection used by GM in the early 80’s through 1995. The early systems from 1982-1986 are just too old to do much with. 1987-1991 were still SLOW computers with tiny chips limiting what can be done with the system.