Question about Pontiac Grand Am

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Will fuel regulator cause 2001 grand am 2.4 cyclinder run ruff with a slight engine knock at idle. And cause engine to shut off at hight speed.

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  • Master
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No it will not, you need to have the knocking sound checked out, it could be rod bearing, or timing chain tensioner, both will damage engine, also need to check fuel pressure and ignition coil packs.

Posted on Sep 15, 2010

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  • Pontiac Master
  • 3,640 Answers

Have car scanned to find problem code if light is on. any auto parts store will scan for free. signs of a bad fuel pressure regulator--the vehicle will not start ( usually in the mornings ) many times engine will start but stall shortly after starting. a bad reg. can result in fouled plugs. replacement is only cure. black soot on plugs, black smoke from tailpipe, running rough, stalling, raw gas comes out tailpipe. are the symtoms if it is bad. some sensors do not nessesarily turn light on.

Posted on Sep 15, 2010

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1 Answer

Making knocking sound


A KNOCKING SOUND IN THE ENGINE IS MOST LIKELY CAUSED BY ONE OF THE FOLLOWING
1. PISTON SLAP: Makes a sharp metallic noise. Idle engine and short out each cylinder plug. The noise will disappear when plug with bad piston is shorted. Noise will also disappear at acceleration. This can be caused by worn or out of round cylinder, or broken piston ring. Correct problem by re-boring cylinder and/or replacing piston.
2. VALVE NOISE: Makes clicking or rattle noise. Caused by excessive wear on valve stem or lifter, out of adjustment, or stuck valve. Correct by adjusting valve clearance, replace worn valve or lifter, regrind cam, replace valve guide and /or valve. A stuck valve can sometimes be loosened by passing oil through the carburetor while engine is running.

3. ROD BEARING KNOCK: Makes sharp metallic noise similar to a piston slap. Detection is opposite of piston slap. Rod knock is not heard at idle. Knock becomes louder as engine speed is increased. Caused by excessive rod bearing clearance. Correct by adjusting rod bearing clearance to .0015 inches by removing shims. May require re-pouring rod bearing.
4. REAR MAIN BEARING KNOCK: Makes dull knocking or thud noise. Detected at speeds between 20 and 50 MPH. Knock will normally decrease or disappear while pulling or decelerating. Noise will be detected the loudest at normal driving speed, when not pulling or decelerating. Correct by adjusting bearing clearance to .001 to .0015 inches. If knock is excessive, crank should be checked for out of roundness. May need to re-pour all main bearings to correct.
5. TIMING GEAR KNOCK: usually the most difficult to diagnose. If gear is loose or badly worn it will knock in all ranges. Run engine slightly above idle speed. Slowly open and close throttle. Knock will continue to be present, but just as engine slows down knock will become a slight rattle. Remove timing pin and reinsert into timing hole on timing gear cover. Press timing pin tightly against timing gear and accelerate slightly above idle. Knock will significantly be reduced or disappear. Correct by replacing both timing gear and crank gear as a matched set. The two gears should have a backlash clearance of .003 to .004. If more than .009 inch backlash, an oversize (.005) timing gear should be installed.
6. WRIST PIN SLAP: This can not be detected by shorting out the cylinder plugs. Rapidly accelerate and decelerate the engine speed. The engine will pass through a certain speed range when the wrist pin will rattle at about the same pitch as a valve tappet noise. This can be corrected by installing a new wrist pin bushing in the rod or new wrist pin f badly worn. Wrist pin should fit the piston and connecting rod with a tight metal to metal fit. The pin can be pushed into the piston and rod with a slight pressure of the hand. Pin to rod clearance is .0003 to .0005 inches.

Dec 06, 2013 | Nissan Cars & Trucks

1 Answer

2001 mercury grand marquis sputtering like it doesnt know which gear to be in when maintaining certain speeds, slight odor of gas in oil?


Is the check engine light on ?
Fuel in the oil could be a faulty injector or the fuel pressure regulator.

Feb 26, 2013 | 2001 Mercury Grand Marquis

2 Answers

Dies when comeing to stop iduling ruff


Is the check engine light on ? If so you should have the computer scanned for trouble codes first. The codes will point you in the direction to look for the problem.
You may have two different problems. Engine dies at a stop is usually a dirty throttle body or problem with the idle air control valve. Running rough could be a long list of things.

Jul 27, 2012 | 2000 Pontiac Grand Am GT

1 Answer

Car only starts if you give it gas and has ruff idle 2001 grand-prix 3.1l


Start by having the computer scanned for codes the codes will telling if theres a problem and can help alot, the car may have a bad fuel preasure regulator where extra fuel is going to engine which makes it hard to start and rough idle, remove the vacuum hose from fuel preasure regulator and start engine if fuel comes out of the hose connection of regulator then replace it.if the regulator is good then go have codes pulled, hope this helps.

Dec 22, 2010 | 2001 Pontiac Grand Prix

1 Answer

Noise at shut down


The noise is caused by the engine running on after the ignition is shut off. It makes noise because the pistons are rattling in the cylinders from incorrect timing. This has nothing to do with the mechanical or electronic timing of the engine. The engine runs on either because of hot glowing carbon deposits in the cylinder head or because the engine was shut down when it was running too fast. Sometimes the carbon can be literally blown out by running the engine at high rpm for a short time. Put it in second gear and run it for a couple of miles on the highway. If this does not work the heads will have to be removed and the carbon cleaned out manually. The shut down when running too fast problem can be caused by the idle being set too high or by shutting the engine off before it has reached idle speed. If you can adjust the idle speed try reducing it. If not always hesitate before shutting the engine down to let it reach idle speed. Good Luck!

Mar 20, 2010 | 2001 Ford F150 Styleside SuperCrew

1 Answer

My 1998 cavalier is running ruff. It's like a sputter....at all speeds. It's worse when I just start it. I don't see anything leaking anywhere. And my check engine light has come on recently. What could...


SOUNDS LIKE THE FUEL PRESSURE REGULATOR IS SLIGHTLY LEAKING. PULL THE VACUUM HOSE OFF AND SMELL THE OPENING FOR GAS SMELL. CHANGE AS SOON AS POSSIBLE.CHECK ENGINE LIGHT MAY BE ON BECAUSE OF O2 SENSOR BEING FLOODED.OTHERWISE, COULD BE A VACUUM LEAK.

Jan 27, 2010 | 1998 Chevrolet Cavalier

1 Answer

Hesitation problem


try cleaning the inside of the MAF sensor and do the following procedure as well.
Here is the most common cause of surges and stalls at stops and low erratic idle speed and rough idle, it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Mar 24, 2009 | 1994 Cadillac Fleetwood

1 Answer

It only idles ruff during park or idle


Here is the most common cause of surges and stalls and low idle rough idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Feb 06, 2009 | 2001 Mercury Sable

1 Answer

2001 Grand Prix GT 3800 series engine


The best solution is to do a complete tune up with new spark plugs, wires, fuel filter, air filter, pcv valve and oil change.. If this still happen I would get some fuel injector cleaner, or use marvel mystery oil in both your oil(crankcase) and gas tank. You can get mystery oil at walmart..its in a red bottle with black label.

Jan 18, 2009 | 2001 Pontiac Grand Prix

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