Z28 lack of power during acceleration

**White Knight** · 02-22-2012, 03:08 PM

Have a 1999 Z-28 with minimal mods. This is gonna be a little hard to explain, but here goes. Sometimes (a lot of the time actually) when I step on the gas, the car stops for a slit second, then goes back to normal. Now, by stop I don't mean breaks. I mean it's like I take my foot off the gas, only I'm not. I'm definitely losing some power. I't never been more than a second before it returns to normal. It's mostly when taking off.

Any ideas? I am new to this, but could it be the O2 sensor or fuel filter? I added a fuel cleaner to the gas, but it didn't help.

**godless-phoenix** · 02-22-2012, 03:14 PM

check to see if your spark plug wires are connected all the way on the plug...had this problem not to long ago and one of the wires wasnt on all the way. maybe just replace the plugs and the wires anyway and see if that helps...

**FinZ28** · 02-22-2012, 03:58 PM

Start with the simple things such as plugs and wires, air and fuel filter. Is the Service Engine Soon light on or does it ever flash while driving? If so, go to your local auto parts store and get them to scan your car so you can see what codes are being thrown.

**White Knight** · 02-22-2012, 04:09 PM

Originally Posted by FinZ28

Start with the simple things such as plugs and wires, air and fuel filter. Is the Service Engine Soon light on or does it ever flash while driving? If so, go to your local auto parts store and get them to scan your car so you can see what codes are being thrown.

The SES light doesn't come on. I have a scanner and tried it anyway, but no codes at all. I am about to order new plugs and wires, and a fuel filter as well. I'll check the air filter in the morning.

Thanks guys, hope it's not a fuel pump!

**cammed goat** · 02-25-2012, 01:38 PM

I agree with checking the wires. My number 5 plug wire was plugged into the coil, but not to the plug. It was just hanging off the coil. Been having misfire issues for a few months. Had a code for bad TPS. Changed that a few days ago and the car didn't cough as much. Found the loose coil wire yesterday and clipped that onto the plug and the car hauls ass again. Make sure the wires click twice onto the coils as well.

**Smittro** · 02-25-2012, 01:49 PM

What's the mileage on your ride?

IMHO

You start getting around the 80-90k mark you should also start looking into a fuel pump.

I've read tons of articles/threads here about fuel pump work.

One thing they all seemed to have in common was being somewhere around the above mileage.

Including my own.

However since mine was an 01 v6 I must add that, though it was a v6, the electric pump motors are the same,

the LS1 simply uses a different pump impeller than the 3800.

If I lost anyone,, I'm talking about the actual electric motors used in the construction of the cartrage style pumps we use/d.

Not the differences in outputs, even though they are different.