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A couple problems for a learning mechanic (help!)

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New User

Oct 25, 2017, 3:07 PM

Post #1 of 5 (689 views)
A couple problems for a learning mechanic (help!) Sign In

Alright so I will start with info on my car:

2006 Pontiac Grand Prix GT
3.8 L V6
95k miles

My problem is a tad bit hard to explain, but I think I can do it. Basically, when I push on the throttle too hard, it gets, for lack of a better term, jittery. If I push the throttle too hard, it stops where accelerating and I stay at the same RPM. If I keep on the throttle with that pressure, the check engine light will turn on after a second or two. Maybe another word to describe how it acts is it almost stutters? It's almost as if there is a limiter on the car, but I have hit some high speeds before so I know there isn't a speed limiter. Sorry for the vague description, but it is difficult to describe without actually showing someone what it does.

My second issue is when I turn my car makes an odd groaning sound. I figured this was due to me having low power steering fluid and I put some more in there. It decreased the sound GREATLY but it is still there some. I have only driven the car maybe a quarter of a mile after adding the fluid, so I might just need to let that set in, but I figured I'd ask while I am here.

Thanks guys for the replies, if there are any. Apologies for the vague replies, but they are quite difficult to describe. If you wouldn't mind describing what the issues might be, and how to fix them, I was hoping to make this a DIY project of possible. Thanks again, guys.

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Oct 25, 2017, 4:01 PM

Post #2 of 5 (670 views)
Re: A couple problems for a learning mechanic (help!) Sign In

Your stuttering problem sounds like a misfire in the secondary ignition related to the plugs, ignition wires and coils, probably all three as they work collectively.

You should have the codes read as they will likely point you to which cylinders are causing the problem, although any parts changed should be done in a complete set.

As for your noise, drive it a little longer for all the air to bleed out of the power steering.


We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

New User

Oct 25, 2017, 4:36 PM

Post #3 of 5 (665 views)
Re: A couple problems for a learning mechanic (help!) Sign In

Thanks so much, I have a buddy that has a computer that can check that stuff. Thanks for the heads up.

New User

Oct 26, 2017, 6:23 AM

Post #4 of 5 (644 views)
Re: A couple problems for a learning mechanic (help!) Sign In

if I were to change all three ignition coils, would I need to test which one it was? Also you said something about the wires, do I replace them too? Sorry for the questions, I am still learning. New to this.

Ultimate Carjunky / Moderator
Discretesignals profile image

Oct 26, 2017, 9:00 AM

Post #5 of 5 (633 views)
Re: A couple problems for a learning mechanic (help!) Sign In

Scan for trouble codes. Someone needs to connect up a high end scan tool that can look at the misfire counters to see what is going on. Lack of power can also be caused by fuel pressure/volume issues or exhaust restriction. You really shouldn't go firing off the parts cannon until you determine where the fault is.

Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

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