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Mike_Shepard

January 1st, 2008 11:38 AM

bad sputter

under acceleration, At cruising speeds its not there I did put new plugs in yesterday and according to my scanner there are no codes or any other obvious readings, Any one experience this before

dewey

January 2nd, 2008 1:17 PM

RE: bad sputter

How about giving us the year, model, engine size?

Mike_Shepard

January 3rd, 2008 2:41 PM

RE: bad sputter

EH sorry haha. Its a 95 Lumina with a 3100 v6. I replaced the plugs and wires to no avail its still there, Could it be bad coil packs?

dewey

January 3rd, 2008 4:39 PM

RE: bad sputter

Did you check fuel pressure? If the pressure looks ok, hit the throttle quickly, if the pressure drops more than 2 psi, there is a fuel supply problem. I can't say that a fuel supply problem is the only thing that could cause a ( bad sputter). It's just a place to start. If you can rule out the fuel system, then you can move on.

Mike_Shepard

January 3rd, 2008 5:34 PM

RE: bad sputter

Quote:

ORIGINAL: dewey

Did you check fuel pressure? If the pressure looks ok, hit the throttle quickly, if the pressure drops more than 2 psi, there is a fuel supply problem. I can't say that a fuel supply problem is the only thing that could cause a ( bad sputter). It's just a place to start. If you can rule out the fuel system, then you can move on.

Thanks for posting, I have not checked FP yet ( I need to get the needle valve out) I plan on doing so soon.

I replaced the coil packs this evening and it didn't seem to really help. But I can tell you this After the car sits and cools for a while it runs semi normal you still have to feather the peddle to go but its not as bad, Is this a sign of a bad O2?

dewey

January 4th, 2008 3:26 PM

RE: bad sputter

As far as live vehicle data, what did the scanner show, about the 02 signal?

You might be able to borrow a fuel pressure gage for mfi system, it would have the fitting for the schrader valve. I'm not sure why your taking out the schrader valve, if that's what your talking about?

Mike_Shepard

January 6th, 2008 8:15 AM

RE: bad sputter

I'll rescan it to see what the O2 is saying. And yea the schreader valve is what I was talking about, My gauge is an aftermarket one I got from jegs for my daytona, It's just a 1/2 gauge and dont have the fitting to press it in without removing it

Thanks man

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