i am swapping my 305 tbi for a 350 with the same tbi.... well i got everything hooked up today and turned her over, my tbi is spraying sooooo much gas,,, what could cause it to do this? i mean it sprayes enough to nearly fill up the barrels or whatever you call them... please help me out i need to know ...thanx guys

 

I would make sure that you have 350 Injectors and a Chip. Does the Computer give you any error codes?

 

tps? if the tps thinks its at wot at idle it could do that

 

yes... make sure the tps wasnt put on backwards... I heard of that happening before... Also check all the gaskets and such

 

The injectors for the 350 have a higher flow rating. Put the old injectors in the new one and see if that works.

 

Good call CamaroGuy71, forgot about that.

 

which is the tps? i will try and turn it around.....(sorry im an idiot)

 

if you look at the tbi, the tps is directly opposit the throttle linkage on the shaft. Its a black rotary sensor on the tbi with a four pin connector going to it. You can measure the tps to see what the resistance of the sensor is. it should have its lowest resistance when its closed and the highest resistance at WOT. Youll have to find which of the four pins connects across the rotary resister. After you verify that its hooked up properly, then you can backprobe it to see what the voltage is. Should be like .7 at idle, 4.6 at WOT or soemthing. This is usually covered in most shop manuals for your car. Good time to get one if you dont have it. If you havnt had the tbi all apart for mods and cleaning then i doubt its on backwards. If you have had it apart then check to see that none of the o-rings sealing the injectors are leaking. Well, id check them anyway. Turn the key to the on position to let the fuel pump prime the system and look to see if gas is leaking out. If not, then you have a problem elsewhere. Maybe an erratic reference pulse from the dist. or something.

 

yall are never gonna guess how simple the prob was.!!! it was the grounds, they werent connecting.. lol!!

 

My car is a 89rs with a 355 tbi and it is doing the same thing as yours. But i have a new tps and it didnt do any thing for it. But mine when i push the gas the ingetors dont spray that much but if your foot is off the gas it sprays like crazy. check to see if yours does the same thing maybe we can both figure what the heck is wrong with these cars.

 

what grounds are you talking about i have the same prob.