please help no power sometimes - NJFBOA - Home of New Jersey's Camaros and Firebirds

chrisfrom nj · 01-16-2007, 09:26 PM

i have a 92 rs with a 305 tbi motor in it sometimes i give it gas and it pulls hard spinning the tires and everything sometimes i floor it and it doesnt move or anything the check engine light isnt on sometimes i start the car and it idles at 1500 rpm then when i turn it off and start it back up it idles at 7 or 800 rpm

SupermanX24 · 01-16-2007, 09:52 PM

Sounds to me like a possible faulty MAP sensor, all though it could be a few other things. How long after ripping it does it go back to losing power?

chrisfrom nj · 01-16-2007, 10:02 PM

depends could be 5 min after ripping it

NJSPEEDER · 01-17-2007, 03:42 PM

easiest thing to start with would prolly be the IAC. it can get gummed up or wear out and hang open/closed. if it is hanging open it will cause a lean condition and rob the engine of a bunch of power.
just pul it out and clean the IAC and the port with some carb cleaner. then reinstall and reset it.

chrisfrom nj · 01-17-2007, 04:03 PM

thanks thats what im going to do tomorrow

SupermanX24 · 01-17-2007, 05:26 PM

Well that depends. If you got a bad IAC, your RPM will fluctuate at idle, instead of staying at a constant 1500RPM. If you DO clean your IAC, make sure you don't get the cleaner in the IAC motor. Cuz then you're f'ed out of an IAC.

chrisfrom nj · 01-17-2007, 07:54 PM

thanks for the heads up my firend has a 350 tbi out of a 88 van would i be able to use the iac out of it

NJSPEEDER · 01-17-2007, 07:59 PM

yes, the TBI's all used the same IAC(4cyl through big block) and will interchange.

DieselKickYoAss4Sure · 01-17-2007, 08:16 PM

possibly the Egr system is malfuntioning! find the egr valve and the simple way to test is to use a vacume pump and hook it to the vacume line the engien should stall or come close to stalling if its working if it dosnt stall the egr valve is no good or the passage is cloged or broken in some way

j0n · 01-17-2007, 08:55 PM

sounds like it has a 305 in it

edit: re-read and i was right...that's your problem

johnjzjz · 01-20-2007, 07:00 PM

i have been fooled buy a part clogged gas filter -- power sometimes falls off than its ok than its not -- just a cheap change out if you had not done it in a while -- jz

chrisfrom nj · 01-20-2007, 07:40 PM

thanks i changed the gas filter about a year ago could it be that my fuel pump is going bad