98 White T/A

iTrader: (5)

Ok so recently my car starts to bog down while cruising at 40-50 mph, you can drive fine under 2500 rpms, but during a 45 mph cruise and you give it about half gas, it bogs down like its getting fuel and not getting fuel, same thing while full throttle.

-I think its the fuel pump going bad.

-My dad thinks its misfires and needs new spark plugs.

-Belle tire wants to charge 350 to put my egr and air back on, they said that would be the starting point for them, i have ls6 manifold, so thats not possible to do right now. And I'm 99% positive the egr and air wont cause this problem.

The fuel pressure during idle is about 53 psi and if you rev it, it drops a number or 2.

I already replaced the fuel filter.

Any help? Thanks!

98 White T/A

iTrader: (5)

Also the fuel pump has a constant whinning noise, i was told that means its going bad.

And I took it out, looked at it, and put it back in, doesnt seem to bog as much while cruising, could just be in my head thinking it fixed itself.

Also closed my cutout to listen to the car, WOT at about 60 mph sounds like metal hit metal with like .5-1 second intevals.

blade2222

Any codes? Have you looked at your spark plugs?

98camarols1

iTrader: (1)

if your fuel pump is whining all the time.means its going bad.i had the same issue til finally one day it died

98 White T/A

iTrader: (5)

Ok, so its not the fuel pump, got it tested and it works perfect, found out the Throttle body sensor was bad so i replaced that, still bogging like before.

Would the spark plugs do that to the car during cruising and full throttle?

All codes i have right now are from egr and air delete.

BlackLS1Bird

iTrader: (2)

I wouldnt think it is EGR or AIR. Most people delete them and it is never an issue. Thats all emissions stuff. Sounds like fuel delivery or lack thereof. How many miles are on the car? Stock injectors? Those might be dirty and not getting enough fuel through them.

98 White T/A

iTrader: (5)

77k miles, stock injectors, currently changing the spark plugs and most of them look badly burnt, one had like oil or something covering the whole thing, and so far every one on the driver side had a bad stink to them when i pulled them out haha.

Uwilllosetomy93lt1

Hehehe....sounds like a good start!

chrysler kid

iTrader: (14)

Replace the plugs and wires with NGk tr55 plugs

Next I would check the maf. Give it a good cleaning with Maf cleaner.

If that doesn't work I would change the 02 sensors. Some times when a front o2 sensor is on its way out it won't trigger a check engine light.

Egr and air are only used when the car is cold. The air system is only used to pulse air in the exhaust to prevent the gurgling noise when the car is decelerating. Egr pumps warm air into the motor when it's cold to prevent back firing.

bad_408_vert

iTrader: (6)

Test/Replace the fuel pump relay and fuel pump fuse.
Do a fuel pressure test at the fuel rail before you dropping the rear and checking the pump.

Could also be the MAF like chrysler Kid said.
I neglected my MAF sensor and it got bad to a point when car would start and just turn off.

Next time it bogs, you can unplug the pigtail connector wire thats next to the maf sensor.( This is how it is on my v6 intake anyway, not sure about ls1).
Try to see if the bogging down stops.

nascarnate326

iTrader: (1)

Had a similar problem with my 96..turned out to be the MAF.

Get a can of MAF cleaner, even if it doesnt fix the problem at least your MAF is clean now.