Biggoofy

Ok I'm having an odd issue. Its like the throttle hits a wall at 4000 rpms. Occasionally it will pull to 5800 but most often it's 4000. I just installed a new upstream O2 and all 8 accel coil packs. I had a check engine light for the O2 and had an occasional misfire and mismatched coil packs so I upgraded. The car now runs smoother but still hits a wall at 4000. When parked I can rev to redline. Not sure what the issue is. Anyone have some insight?

Convex

Fuel filter maybe?

Camster

My thought as well.

swarthyfellow

MAF perhapes

jwog666

plugged cat, low fuel pressure, plugged air filter, MAF could be as well

96mustanggt11

I'm having the same problem in my 96 and can't figure it out changed the maf the fuel pump fuel filter I tryed dropping the exahst and driving it I'm
sorry I have no solution bease mine is the same way

swarthyfellow

TPS? That is an easy thing to test with a ohm meter.

302Travis

So does it hit 4k and absolutely will not climb any higher? Or does it still go above 4k but just with barely any power?

Biggoofy

It's like redline at 4k. I've traced it to a fuel pressure issue. I have 35lbs at idle and 10-15 at 4k so I'm ordering a new pump. Looking at a walbro 190 along with a new fuel filter.

302Travis

When was the last time you changed the filter? Sounds like you found the issue though!

Definitely go with a slightly bigger than stock pump. It'll be one less thing down the road you have to worry about if you want more power