hey all maybe you guys can help or give some advice... my 88 t/a 305 tpi 700r4 tranny 4.56 rear fuel seems to backfire inside the cat and BLAST it out the exhaust only when i decelerate off the gas pedal coming to a stop... any ideas lol im stuck my brain doesnt want to function

 

Why are u running the waste of 4:56 gears with a TPI?

Did u swap speedo gears so the VSS reads right?

Leaking 9th injector?

Bad temp sensor?

Leaking injectors or regulator?

later
Jeremy

 

well didnt swap speedo gears yet just waiting for warmer weather to pull the one i have out of the car lol
injectors arent leaking either is regulator....all temp sensors read good when i put scan tool on it seems like its getting alot of fuel little air....check engine light is on not sure of codes but i know it has to do with emissions very very wierd

well 4.56 came with car when i bought it

 

You may have a wiped out cam lobe, engine tick much in the lifter valey? I did it to my 305. Used to backfire BAD when I shut it down if I didnt blow the exhaust before shut down.

 

not to change the thread but how does youre car perform with those gears? does it hook up?

 

When was the last time you time you gave your car a good tune up?? (With good quality replacement parts)?

 

8t9 runs pretty good with 4.56 very fast off the get go not using for racing just because i bought it this way

tune up no but i have brand new ac delco plugs in it cap and rotor i have yet to put on it due to coldness of the outside LOL cant wait till spring weather then i should have tune up done :-)

but i do think the motor is getting to much fuel and not enough air i hate TPI rubber air intake tubes they are too long lol maybe MAF is screwed up not sure yet