I JUST BOUGHT A 1990 TRANS-AM, IT HAS A 305 TPI, NO MAF,
SPEED DENSITY. I REPLACED WIRES, PLUGS, CAP, ROTOR, IAV,
TPS, PCV. MY BRTHR IN-LAW DID TIMMING, USEING JUMPWIRE
METHOD.OH, I ALSO HAD MOTOR AND INJECTORS CLEANED ( H-VAC ). THE MOTOR IS WAY STRONG AND IT HAS FLOWMASTER
EXHAUST. AT A DEAD STOP: I FLOOR IT, AND IT BOGS AND GRADUALLY TAKES OFF. IN PARK YOU MASH THE PETAL IT SOUNDS
LIKE A BEAST. ALSO MY TRANSMISION SHIFTS FUNNY IT SNATCHES
IN 2ND OR THIRD AND WHEN I FLOOR IT TO PASS GOING ABOUT
65 IT BARELY WANTS TO PASS ANYTHING. EVEN A 4 CYL, EMBARRASSING, THIS CAR LOOKS MINT, SOUNDS GREAT, BUT
NO POWER. THE ENGINE IS VERY BUFF, BUT RUNS LIKE A PUFF.
PLEASE HELP. RON. P.S I DID ORDER
F-TECH HEADERS

 

Welcome to the forum. First off, please LOSE THE CAPS LOCK. It's like you're SHOUTING at us and it's considered rude.

Is your car throwing a code? How old is the cat? Has the O2 sensor been changed?

I also have a 305 and for a little POS it runs pretty damn strong. No bogging at all, when I floor it, get out of the way!

 

Except for the bogging, sounds like your car is performing adequately for what you have done to it.

 

Welcome to the world of TPI.

 

sorry didn't know about caps guys, and thanks for welcoming
me. yes, i did change o2 sensor. and the car came without
cat converter, i will check codes in sec. it does have a couple
2-3 exhaust leaks though and there is some kind of tube
running to my manifold. and i do have a little pop or backfire
after i floor it and boggggggggggg down. when you have to think
twice to pass a little electric car, dissapointment over whelms you.
thanks guys, any help is usefull and fully appreciated.

 

I'm no expert, but I'd say start fixing what you know is wrong with the car (exhaust leaks, ect.) and then go from there.

 

i did a scan on my car it just flashes code 12 repeatedly,
and also can anyone tell me whats the (arc) in the fuse pannel
for. thanks.

 

Oh come on that's BS. My car has TPI and it's no slouch. No bogging. If I downshift and floor it to pass someone, I get instant power and revs. Hell, if I'm going like 60 or more, I don't even bother to downshift.

If he has serious bog, something's wrong with the thing. It can be fixed. I assumje from the sound of his post that he has an auto trans. Is it kicking down when he floors it? If not, that's a problem.

 

yes, it is automatic trans 700r4, when i floor it to pass, it won't
even stay in passing gear. couple secs or so then boggs bad. i
love this car, always wanted one, i just want her running tops.
no codes at all. thanks guys.

 

Whens the last time you changed the fuel filter?

 

Sounds like a fuel delivery issue.

TPI isn't exactly known for competitive power, especially at high RPMs; but it sounds like yours is defective some way. One of these cars should pull as hard in a passing situation as it does taking off from a stop.

Thing to check: fuel filter, injectors need a real cleaning (www.cruzinperfomance.com) instead of the prophylactic, maybe fuel pump (let's hope not)

I doubt you'll be real impressed by the low-bid headers. Don't be afraid to cut your losses and move on to something decent if they aren't what you had hoped.

 

i just received a hard code (45) , in wich i did replace. it's
not even a month old, ive seen this code last time, but
it's back with a vengence. i don't have dual o2 sensors.
305 tpi vin #F i did smell fuel, strong through vents in car
this morning. funny smell though? any suggestions. help
(please.) thanks. ron

 

well after reading this, ( i know i havent posted in awhile, wrecked my car ) but after reading this thread, i noticed he said there is no MAF, that is why the car is bogging down, its making it either run rich, you have to have a MAF sensor or the car will run like S*it

 

In 1990, the fuel/intake system changed and got rid of the MAF in favor of the harder-to-tune speed-density setup.. I don't understand why, but GM must've realized it wasn't a good idea because then the LT1 was based on MAF translation again..

 

how do i add a maf, and what do i need to get . if i may ask?
and thanks guys!

 

You don't need a MAF. Your car was not designed to run with a MAF. You have the speed-density (SD) setup, which is just fine..