Our Community is 940,000 Strong. Join Us.


94 century 3.1 loses power when warmed up


kirby747
06-02-2006, 09:14 PM
I have a 94 buick century,3.1,runs like a charm till it's warmed up then hesitates,has new plugs,wires, changed coil pack/ignition module, does same thing, seems like it's starving for fuel, no codes showing.., doesn't stall but just lacks power,fuel pump comes on 2 secs then shuts off when i turn on key,seems normal?Does the pressure regulator fail sometimes?and where is it? appreciate any feedback, thanks

maxwedge
06-03-2006, 08:31 AM
Get a fuel pressure gage on it and see what you have, especially under load, 35-41 psi I believe.

kirby747
06-03-2006, 11:46 PM
Thanks Max, think i'll get a pressure guage next week,can't find where it hooks on,seems hard to get at on that engine,but when i kicked it down it took off good so may not be fuel pressure, found vacuum line off going to egr valve i think, hooked that up seems to help a lot, still has bit of a pause but then seems to have full power

corning_d3
06-04-2006, 12:13 AM
It's possible a bad 02 sensor is causing problems. The ECM ignores the sensors while warming up and uses a preprogrammed fuel output because they aren't hot enough to work yet.

kirby747
07-06-2006, 04:20 PM
It's possible a bad 02 sensor is causing problems. The ECM ignores the sensors while warming up and uses a preprogrammed fuel output because they aren't hot enough to work yet.

Bingo! corning_d3, was indeed the 02,now its responsive all the time,many thanks

corning_d3
07-08-2006, 04:54 PM
Glad to hear it!

Add your comment to this topic!