SHO Won't Go +80mph

[BenBrausen]

Within the last week, my SHO won't go over 80mph. When I floor it, the engine boogs and won't accelerate til the pedal is let off enough to a point just above the original position. I replaced my fuel filter and it didn't help. I can hear my fuel pump when I'm outside my car and I never could before. Could this be a bad fuel pump or a clogged cat? Could this all be caused by my bad ATX tranny? It hasn't done this the last +10K mile's I've driven it on the bad tranny. Someone please help. I want my power back!!! cry

 

[Silver Bullet]

I had the same thing happen to me... If you go to the left rear of your SHO, and you can hear a low pitch whining type of sound (Your fuel pump is dying). I kept hearing a weird whine coming from the rear of my SHO, and my cars acceleration flat out sucked. After a new pump, everything was fine.

Also... Clogged cats will also effect your acceleration "DRASTICALLY"!! I had clogged cats for 7 months "Due to the outrageous price for a Y-Pipe/Cat assembly". I bought a High Flow Y-Pipe/Cat assembly from (PERFORMANCE PLUS.com) for $596.00 "Including Shipping",and my car has all it's power back and then some!!!! Ford wants $2200.00<---"Not a typo" for the Y-Pipe/Cats rant

*I would replace your fuel pump first, and if that doesn't workit's most likely your cats. Good Luck thumb

<small>[ May 05, 2003, 04:49 AM: Message edited by: Silver Bullet ]</small>

 

[sdpatt]

This could be one of the two problems that you identified. All fuel pumps make a "whining" noise so you can't judge a pump's health by the fact that it is whining. If the noise has changed to a struggling, groaning or unsteady noise then there may be a problem. Before labeling the pump as bad, check the pressure at the fuel rails.

Your situation does sound like a fuel-limited condition since slight throttle openings are accepted but large ones are not.

A plugged exhaust system will usually be evidenced by loss of power at higher exhaust flow conditions: higher rpms. You can inspect the exhaust by first tapping on the cats with a rubber mallet or wooden handle to check for loose parts. If any rattling is found, you can separate the cat ****** and look inside the Y-pipe to check for obstructions. If parts has loosened from the cats, you may also need to check the cat-back for chunks of ceramic matrix from the cats.

To clean cat parts out of the cat-back, I have plugged one exhaust tip and duct taped a leaf blower to the other and blown the loose cat parts out the open cat ****** in the reverse flow direction. Wear goggles and a filter mask.

 

[Speedy_91_SHO]

I agree with scott about the fuel pump

All fuel pumps make a "whining" noise so you can't judge a pump's health by the fact that it is whining. If the noise has changed to a struggling, groaning or unsteady noise then there may be a problem.

I do not remember any fuel pump noise and then my pump want bad and I replaced, now there is a pretty loud whining noise. I don't know how many people have said "dude I think your tire has a leak in it"

 

[BenBrausen]

When I gradually accelerate it looses all power at 80mph in OD. I can drop it outta overdrive (when my slippin' tranny chooses to be nice) and push it out to 90mph but it takes a VERY long time (more then 20 seconds 80-90mph). There is a lil hesitation off the line at times but that could be the tranny too. I have Wed. off and I'm gonna stop by my dad's cusin's shop and have them check the fuel preasure and the cats. I would like them to cut them out (I'll replace them wink ). I have to talk to them about droppin' my tranny and shippin' it out to be rebuilt and havin' some other crap gone (tune-up, summer tires, radiator flush). Anything else I should have them do?? No charge for labor.