Question about 2000 Pontiac Grand Prix

4 Answers

3.1L engine ticking noise

Problems started to escalate a few months ago, for the longest time my car had the chronic piston slap that this car has been known to be plagued with. but as with every other car the noise would tend to go away within the first few min. of soft driving. About two to three months ago the ticking became far more obvious at the start and continued to tick whenever the car was running. The very noticeable times when i can hear the tick is while it is in idle and and during the very first parts of acceleration. I have changed oil regularly and done all normal maintenance. Mind you this car only has 49,000 miles on it. Should not be having these sorts of problems yet. Two weeks ago my father and law and I decided to delve farther into the engine and see if the problem could be a bent push rod or anything else that we could see. after we got the valve cover off found that all push rods were in good straight order, mind you we took out one at a time and replace one at a time as to avoid confusion. noticed however that the rocker arms had a side to side movement in them that seemed to cause a slight ticking noise. I guess my first question would be is this a normal thing for the rocker arms to be making this noise, and second what else could this noise be? I am starting to get tired of chasing a phantom noise. Already changed oil with several difference viscosity's had cleaned the egr valve. added lucas to the oil. Would like a solution that doesn't involve going to a mechanic. Please help. Thank you

Posted by on

4 Answers

  • Level 1:

    An expert who has achieved level 1.

    Governor:

    An expert whose answer got voted for 20 times.

    Corporal:

    An expert that has over 10 points.

    Mayor:

    An expert whose answer got voted for 2 times.

  • Contributor
  • 4 Answers

This a piston slap. GM recognised this problem years ago but instead of repairing 100,000 motors they call it "normal". If it goes away after warm up you should be ok to keep driving it.

Posted on Sep 26, 2009

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 607 Answers

SLIGHT side to side rocker arm movement is not abnomal. Tapping in a rocker arm will come from poor lubrication ( oit coming up through the push rods ) or worn end on rocker arm itself, or the lifter/.cam lobe , or push rod ends. OR maybe its something else unrelated to the rockeer ar. I would ( valve covers OFF ) , ( provide covering for oil splash ) At idle sold listen for tick, i would use a stethsoscope. Hope this helps

Posted on Apr 19, 2009

  • Level 1:

    An expert who has achieved level 1.

    Mayor:

    An expert whose answer got voted for 2 times.

  • Contributor
  • 1 Answer

I have experiance this same issue on a 96 modle. The ticking eventually got worse and then the tapping became noticable enough for the knock sensor to pick it up and ****** the timing at low RPM causing poor performance. I have had the top off a couple of times hoping to find somthing wrong. I have even installed all new lifters but the tap has become a very loud knock that is only a little less after being warmed up. It sounds like valve train, but I am believing it is a sloppy piston. The noise goes away completely at 2000 RPM. I have great oil pressure. I wish I knew for sure but going deeper probably involves pulling the engine. I'm gonna drive it till it blows.

Posted on Mar 25, 2010

  • Level 1:

    An expert who has achieved level 1.

    Corporal:

    An expert that has over 10 points.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 20 Answers

Try taking out all of the spark plugs and turning the engine over with the starter. Shouldn't hear piston slap at that rpm with no compression. If it still ticks, it may be a loose timing belt or failing tensioner. I had a tick that started only when cold and got worse & worse until the belt jumped. The cause was a tensioner that was partially plugged. This caused a loose belt which allows the valve springs to snap the valves shut after the cam passes the highest point.

Posted on Sep 08, 2014

2 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

  • 6982 Answers

SOURCE: 3.1L engine ticking noise

If you noticed any wear grooves on the rocker pivots, it could be that the rockers are worn. changer any that show obvious wear. Some movement of a rocker when not under tension is normal but should not be excessive. You can also check to see if any rockers have less travel than others by slowly turning engine by hand and measuring the travel on each (intakes may vary from exhaust, but should not vary from other similar ones) If any move far less than others it can be due to a collapsed or worn lifter, or worn cam lobe. Piston slap is a different issue and usually can be identified only by a good tech with lots of experience.

Posted on May 28, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

I have a ticking noise from my engine


Ticking noises from an engine, even an SBC, are never normal, Richard. You may be hearing lifter noise (one bad lifter) or excessive valve lash, or both... or you MAY be hearing a small exhaust leak from one manifold. If the pistons you put in aren't a really good match for the cylinders, you may be hearing "skirt slap", which will devolve into a really bad situation later down the line when the piston skirts break off. You may possibly be hearing bearing rap from either rod bearings or main bearings, if they were a little too loose, or timing chain slap if the tensioner isn't working right, or looseness in the distributor drive, or even spark snap between a plug cable and the block or head.

Aug 07, 2014 | 2003 Chevrolet Suburban 1500

1 Answer

Knocking sound when engine is hot


Sounds like car has been overheated and has a collapsed piston skirt. This will cause piston slap until piston heat up and expand.-------------------------------------------------------------------------
vas 5054a

Dec 03, 2012 | 1999 Chevrolet Silverado 1500

1 Answer

Engine is knocking needing to know anything and everything that could cause this. We just replaced the transmission a week ago and we have an O2 sensor out.


Engines can make many different noises and people will describe them as knocks, pings, rattles or thumps. A true "knock" is caused by rod or main bearings hitting against the crankshaft. The general cause of that is either too much space between the bearing and crankshaft or insufficient oil pressure to maintain the distance between the bearing and crankshaft. Sometimes you can use a heavier grade oil so that the oil doesn't leak out of the bearing space so quickly. If you're currently using 5 W 15, go to a 10 W 30 or maybe even a 15 W 50. If you can't make the noise go away with that, either the bearings are too worn or it's a different problem. If the engine has less than a couple hundred thousand miles, the only reason for bearings to go bad would be inadequate maintenance.

Other problems that can result in noises like that are:

Piston slap. That's when the skirt (lower part) of the piston is slightly worn and is enough smaller than the cylinder that the skirt "pops" from one side to the other as the engine runs. It's more of an annoyance than a real problem, especially since piston slap typically goes away as the engine warms up a little. It typically takes just a few seconds to go away. If it's piston slap don't worry about it until the engine is rebuilt. Piston slap is quite common among many of the GM 350's, especially in engines that go short distances a lot or don't get adequate maintenance.

Fuel "pinging". That's when the fuel ignites too quickly and causes a sound like something rattling around inside the engine when you step on the accellerator. Use a fuel octane booster or change the engine timing.

Hydraulic lifter noises sounds more like a tapping sound and is usually caused by inconsistent oil changes

SHORT STORY, IT IS 13 YEARS OLD AND 3 YEARS PAST ITS DESIGNED LIFE

Jun 10, 2011 | 1998 Saturn SL

1 Answer

95 Lincoln Town Car: Engine Makes Loud Tapping Noise


It has to be internal. Is it your valves or a slapping piston? (Sorry but internal engine problems are hard to diagnose without tearing down the engine)

Apr 30, 2010 | 1995 Lincoln Town Car

1 Answer

My engine make a sound like there is no oil in the car but after a few minutes it stops. Do i need a heavier oil


No, check the oil level and you can add Lucas engine oil additive. The Lucas oil will add fluid retention to your oil and will keep the piston slap to a minimal. It's common on newer cars with high tolerance engines like yours, and if the engine was not warmed up prior to driving it hard will cause the engine to have piston slap much worst throughout it's life. You can do a search on GM piston slap problems to give you some more information to the noise your describing. There are a few things that can help, add Restor engine oil additives and Lucas engine oil to your regular engine oil service maintenance time. This will help with the waring up the engine before you go for your drive, good rule is the engine is warm enough when you start getting some heat from the heater. Good luck and keep me posted, be glad to know this helps your Saturn. It has for many on here with the same problem.

Jan 24, 2010 | 2003 Saturn VUE

1 Answer

Experiencing a "ticking" "knocking" type noise when 1st starting the car in colder weather that goes away once the blazer warms up , any help ?? I was told it could be the exhaust manifold , or piston...


it may need a lifter or valve adjustment when cold they will tick or knock depending on how loose or worn out then when it warms up they swell with heast and noise stops. after adjusting or replacing it will stop making noise

Oct 26, 2009 | 2002 Chevrolet Blazer

2 Answers

3.1L engine ticking noise


If you noticed any wear grooves on the rocker pivots, it could be that the rockers are worn. changer any that show obvious wear. Some movement of a rocker when not under tension is normal but should not be excessive. You can also check to see if any rockers have less travel than others by slowly turning engine by hand and measuring the travel on each (intakes may vary from exhaust, but should not vary from other similar ones) If any move far less than others it can be due to a collapsed or worn lifter, or worn cam lobe. Piston slap is a different issue and usually can be identified only by a good tech with lots of experience.

May 28, 2009 | 2000 Pontiac Grand Prix

1 Answer

Alright, so my sister came over and when she was leaving she started her 2002 olds alero and i heard a ticking sound. It sounded like more than one lifter was ticking. Is this a sign that the oil pump is...


That tricking noise is common on the 3.4 gm engine's. It's called piston slap, you get it most of the time on first start or when you turn the car off and it just cooled enough for the pistons contract again.
There is nothing we can do about it, with the newer engines being built with higher tolerance you get annoying  noise. 
Best thing to do is to do oil and filter changes every 3000 miles, and warming up the car about 3 min before driving off. 
The way you engine was made, you don't have to wait since there is tolerance for expansion but your going to wear out the cylinder quicker. 
I find that adding Lucas Oil treatment with every oil change has eliminated the piston slap from my wife's Montana. Good luck and hope this helps. 

Apr 22, 2009 | 2002 Oldsmobile Alero

2 Answers

Ticking when cold


you arent getting enough oil to your lifters,,,,check you oil and see where its at level wise

Dec 25, 2008 | 2002 Chevrolet Silverado 1500

Not finding what you are looking for?
2000 Pontiac Grand Prix Logo

3,726 people viewed this question

Ask a Question

Usually answered in minutes!

Top Pontiac Experts

yadayada
yadayada

Level 3 Expert

75066 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22095 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

7754 Answers

Are you a Pontiac Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...