I have 2 problems with my l98

__ When I put it to the floor it will not shift into third gear.
It will red line and i have to let off. Sometimes at a low punch it will shift right before it redlines.



__ This problem just occured, When I give it the gas the car shakes. It doesn't do it everytime i give it the gas. The exhaust sounds wierd when it shakes too.


Before this happened i installed an adjust fuel pressure regulator and pulley set.
I had some headers installed at an exhaust place.

When i got my car back from getting the exhaust done it would not shift. The shaking started 4 weeks after shift problem.

Could the 2 problems be linked? Or could she shaking be a fuel pump and the shifting be the transmission? Or could it have to do with the pulley set?

 

I doubt the pulleys have anything to do with the problems you are experiencing. My guess would be when you installed your AFPR you didn't reset the TV cable (which is connected to the throttle body and plenum), and that'd why your transmission no longer shifts into 3rd at WOT.

If your engine is shuddering, then I'd bet your fuel pressure is off or you might have some vacuum leaks from hoses or maybe the plenum bolts aren't tight enough. I'd also check the header bolts to make sure you don't have any exhaust leaks (esp on the driver side since that's where the O2 sensor is). If there was any coating on the headers that burnt off on the inside, that may have fouled up your O2 sensor. I'd also check TPS voltage while you're at it to make sure that didn't get thrown off when you did the AFPR. Just a couple of things to check...

 

WOW!!

That's no little list of wrong stuff!
Of course it will be difficult to diagnose over a wire without being there, start with the first problem you experienced first. If everything was fine before the exhaust shop, and immediately afterward something changed, start there.
Maybe a bracket or shield or sensor or something was moved or hurt at the exhaust shop.
After your first problem, the other problems happenned, right?
Those problems are probably a result of the first problem that happenned. Confused yet? I am!!
Just remember to start at the beginning, at the first instance of the first problem, work your way out from there.
Best advice I can give, sorry...............

 

I resest the tv cable and that did not change a thing.

I could try checking the fuel pressure and setting the tv cable again.

Could it have anything to do with cruise control. My cruise control just quit working a day before it started shaking.

My brother was messing around with it by squeezing and making the engine rev. The problems occured after that too.


-I baught the afpr and put it on and set it at 45. I drove it and it shifted fine.

-Then my pulley set came in the mail and i put those on. I didnt really get on it much at all after i put them on but it was running fine.

- then i got my headers. Took my car in and they put them on. It was raining when i picked it up so i couldn't get crazy.

I took it to the strip the next day and it would not shift into third.

then not too long after i had the shaking problem.

Sorry if this is really long, i just really like my car and i need help.

 

My guess would be the TV cable as well. Can you shift it manually into third? I know alot of the cars like ours came out of the factory with a servo that wouldn't allow them to shift into OD at WOT.

 

I tryed shifting it manualy and it didnt not work.

 

Go back to the exhaust, man. Everything was fine until you had those headers put on. Something got moved, pinched, broken, something. Look at everything with a microscopic eye. Something is amiss and it didn't happen before your exhaust work.

 

shakes at high rpm along with Weird exaust note? i think it isnt gettin enough fuel, or the timing is off a lil. as far as shifting is concerned, check the linkage back around the firewall, maybe when they put the headers on they pinched something?

 

If your fuel pressure is right and this all started after the trip to the exhaust shop, then that's where the problem began. You didn't say how the exhuast system was set up, but if the lead in to the cat is bigger, the exhaust shop might have done some fabrication to make the headers fit. This fabrication could've led to a serious restriction which is causing the shaking and lack of power. As for the shifting problem, I'd start by checking the linkage where it's bolted to the trans. If they removed the linkage and put it back on at an improper torque, it could be causing some binding that may be affecting your clutch bands. This could lead to premature trans failure. Not a good thing.

 

I took my car into the dealership and the guy said it was one of my fuel injecters. He said i had to replace them. then he said once he does that he look at the tranny.

 

After headers=shake= burnt plug wire, hope you looked them over before yuo get yanked for the injector change.

Cruise control...thinking vacuum issue...leads to drivability.

Gotta be systematic...then again f it's your daily driver you gotta pay to drive.

 

take him out behind the tool shed and kick his a$$.

Cruise issue is a vacuum problem like 8Mike9 posted.

Trans issue may or may not be related. Have had a couple 3rd gens trans crap out and not shift to 3rd when WOT. Something in the valvebody or govenor takes a ****.

 

That's funny Lo-tec. I am going to print this out and give it to the guy who knows a lot about firebirds at the dealership.