chrisrip

I have an 88 T/A with a 305 tpi. I have been getting a code 34 and the car jerks (for lack of a better description) at lower speeds. (around 30-45). I have replaced the cap, rotor, plugs, wires, etc. Also replaced MAF sensor and relay. The latter seemed to take car of the code, but I still have the low speed jerk. The car only has 75,000 miles on it. Any ideas?

tpi_roc

Low speed or low rpm?


What range does it happen in?

And what fixed the codes, the relay replacement or MAF replacement.

chrisrip

It seems to be more low speed than low rpm. You can pull it down into 3rd at low speeds and it still does it. I believe it was the relay that cured the code.

tpi_roc

well most cars will jerk if you put them in a power range that barely has enough umpf to move the car...

I hope thats not what you're doing.....


aside from that it could be timing/fuel

Do you have a scanner? Or can you get ahold of one?

TransAm87

Did you try you O2 sensor, that is the next on my list for my codes
and what i am doing saturday

chrisrip

It jerks at low speeds, but the rpms are definitely high enough to keep the car from being totally bogged down. What should the timing be set at? The label under the hood says 6*. I checked it, and that is where it is set. I checked the fuel pressure too. When you first turn the key on, the pressure jumps right to 45lbs, but drops right back to 40lbs. I've been told that anything under 40 1/2 is too low. The 34 popped back up today too. I can probably come up with a scanner. I will have to ask around.

Canuck 88' T/A

I have an 88 T/A w/ the same engine. I had the same problem. It turned out to be the throttle positioning sensor. Might want to check it out.

chrisrip

Hey Canuck...When you say it was the tps, did it just need adjusted, or did you replace it. Were you also getting a code 34? Thanks

Canuck 88' T/A

My TPS was completely buggered and had to be replaced. I'm not sure of the code number since I didn't scan it. I would just do a simple voltage test to see what kind of juice it's getting. Hope this helps you out.