garvette91

I Have A 91 L98 With The 6 Speed Man Trans That Is Losing Power After It Gets To Around 2500 Rpms. I Was Told That It Has A Code 42 And That Replacing The Plugs And Wires Should Get Rid Of It. Well I Put A Cap ,rotor Coil ,wires And The Gm Recomended Plugs In It And It Didnt Change . Ever Heard Of This Happenning . Just Out Of The Blue? Thanks For Your Time.

86VX1

have you checked fuel pressure?

garvette91

No I Havent Checked That Yet Due To The Car Is Sucking The Gas Down And It Seems To Be Running Rich. I Did Check The Timing And It Is Right On.

86VX1

what mods do you have on the car? if you have a fuel pressure gauge tester, test the fuel pressure at all rpms. if your fuel pressure is below
38-40 psi at any given rpm you could potentially have a bad fuel filter or pump or pressure regulator. don't go out and purchase a fuel pump, see if you can get someone in your area to lend you a fuel pressure test guage and let's go from there

any body else have any ideas?

hippy

As low are your RPMs are at I would check into a clogged cat. Check the FP but I bet your cat is junk.


Post this in C4 tech as you'll get better responses.

garvette91

Thanks For The Help I Will Post This In The Other Section . I Changed The Fuel Filter And Is Didnt Help So Im Going To Try To Get Someone To Test The Converters And The Fuel Pressure. Thanks Again ,i Will Let You Know How It Comes Out