tcflint

iTrader: (4)

My 2.8 Firebird has starting dropping power around 3,000 RPM (like turning the key off and then back on) it will throw a SES light and be ok if you let the RPM back down.

I was thinking maybe a throttle postion sensor????

Keeping your foot in it at 3,000 would cause it to actually stall.

Not sure it is the postion of the throttle or the RPM that causes the problem.

enswrob

whats the code. use a paper clip to get it. should have it to help with troubleshooting purposes

project89

iTrader: (1)

sounds like a faulty vss sensor sounds liek its hiting the mph limit fuel cut pul the code and se what it says

tcflint

iTrader: (4)

Where is the VSS located?

FireInMe17

On the output shaft on the transmission.

Have you thought about a clogged/dirty fuel system? Sometimes if a fuel filter is dirty enough it will cause driveability issues and prevent you from getting the engine past a certain point.

KNBlazer

if you have a spare ignition coil and module I'd throw them in there and see if your problem goes away...

tcflint

iTrader: (4)

Fuel filter was changed a few times when I owned it, injectors were new and new fuel pump in the winter.

These things weren't replaced to try and fix the problem...just letting you know what was updated.

Think I have a buyer for it now anyway, but I'd like to give him as much help as possible.

TomP

With the RPM cutoff, sounds like a clogged cat (old convertor = pellet bed breaks up and disintegrates) or exhaust to me. To test, disconnect the exhaust at the catalytic convertor- if the car runs past 3000 rpm, the exhaust was clogged.

Otherwise I'd check ignition timing- if you find out it's way advanced (stock is only 10 degrees advance), check the spark plugs for detonation (missing pieces).

Roger Davis

Bad injectors can do this... I know the hard way. Shop swore it was a bad convertor, it was a bad injector. A rebuilt set got me going great!