Question about 1999 Pontiac Grand Am GT

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The engine has random piston firing. I replaced the sparks but it continues to stall. What are the remedies I can follow.

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IF it is the 4 cylinder, replace the boots, coil packs, and module under the cover. If it is the 6, most likely will need a coil pack.

Posted on Jul 29, 2009

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How to reset timing on 1992 454 tbi after replacing distributer


You have to put the number 1 cylinder at Top Dead Center of the compression stroke, and then you install the distributor with the rotor pointing to the #1 spark plug wire tower that is on the distributor cap.

Pull the spark plug from number 1 cylinder. You need a helper to turn the engine over by hand (using a socket on the crank pulley), or he can bump the starter over in very short bursts. Put your finger over the spark plug hole. When the piston is rising on the compression stroke, you will feel air pressure on your finger. Now look at the crank pulley and turn the engine on over until the zero degrees mark lines up on the timing pointer. Or you can stick a long straw or similar into the spark plug hole (don't let it drop into the cylinder!) to feel when the piston is at top of travel...see, you feel for pressure build up with finger (piston is rising on compression stroke), when you feel it, turn engine on over by hand until the piston is at top of travel-that is TDC of compression stroke. Now install distributor so that rotor ends up pointing directly to number 1 spark plug wire tower. Then follow firing order -as the rotor turns, it will follow the firing order around the dist. cap.
There are two top dead centers of each piston, tdc of compression stroke and tdc of exhaust stroke- to time the engine, you need tdc of compression-that is when the spark plug fires in the cylinder, so that is when you want the distributor in with the rotor pointing to #1.

Jul 28, 2014 | 1992 Chevrolet C/K 3500

1 Answer

Auto piston not firing


Replace the corresponding spark plug and coil on plug assembly. Also verify good continuity at all connections.

Apr 04, 2014 | 1996 Jaguar Xj Series

1 Answer

So my car, at random, will randomly lose power. The Tachometer will dip about 500 rpm, and then bounce back. This will slowly increase until the car stalls out, and it happens whether i've popped the...


To start with please do the following:
- Check the spark plug cord's resistance. (8 K Ohms- 25 K Ohms).
- Check spark plug gaps. (0.7 mm - 0.8 mm).
- Check reluctor to pick-up air gap. (0.30 - 0.40 mm).
- Check distributor cap for cracks or water accumulation inside.
- Check ignition timing. (10 - 12 degrees at idle speed).
- Adjust engine idle speed to 650 - 750 rpm.
- Check the valve timing.

Sep 25, 2013 | 1994 Toyota Corolla

1 Answer

Engine stalls on Isuzu I-370 truck after warm up


The Cam sensor usually senses the position of the timing belt or timing chain gear and tells the computer when #1 cylinder is at top dead center. In other words, when #1 cylinder comes up. Crank sensor tells the computer when to fire the spark plugs in the rest of the cylinders. In other words, as the crank shaft goes around it tells the computer when each piston comes up so it can fire it's spark plug


so replace the crankshaft sensor

Jan 04, 2013 | 2007 Isuzu I 370

2 Answers

What does a crankshaft sensor do? 04 hyundai santa fe 3.5


The crankshaft sensor is responsible for sending a signal to the PCM (powertrain control module) it tells the computer what cylinder to fire at the coresponding time, it lines up with whats called a trigger wheel on the crankshaft as the crankshaft spins there are small notches cut into the trigger wheel when 1 of the notches lines up with the crankshaft sensor a magnetic field forms between the trigger whell and the sensor and the computer charges the coil for that corresponding cylinder, once the magnetic field dissappears when the notch passes by the sensor the computer fires the spark plug for that corresponding cylinder if you have a bad crankshaft position sensor you will more then likely have a stalling condition due to weak spark or if the sensor is totally gone your engine will just crank and not start due to the spark plugs not having any spark being delivered to them......

Dec 10, 2010 | 2004 Hyundai Santa Fe

2 Answers

03 chevy express 6.0 misfire code po300, rough idle, sputters and stalls.


P0300 Diagnostic Code - Random Misfire
Technical description:--
Random/Multiple Cylinder Misfire Detected:---
Exactly what does this code means:--
Basically this means that the the car's computer has detected that not all of the engine's cylinders are firing properly.
A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.
Symptoms:--
the engine may be harder to start.the engine may stumble / stumble, and/or hesitate.
other symptoms may also be present…There may be rough idle, sputters and stalls and jerks.
Causes:--
A code P0300 may mean that one or more of the following has happened:
Faulty spark plugs or wires, Faulty coil (pack), Faulty oxygen sensor(s)
Faulty fuel injector(s),Burned exhaust valve, Faulty catalytic converter(s)
Stuck/blocked EGR valve / passages, Faulty camshaft position sensor, Defective computer.
Possible solutions for this error problem:--
If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the vehicle, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.
Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or un-metered air getting past the airflow sensor, or an EGR valve that is stuck open.
Thanks. Keep updated for any more query. You can rate this solution and show your appreciation.

Aug 10, 2010 | 2005 Chevrolet Express

3 Answers

Symptoms of a bad pick up module on a 1996 GMC K2500 Suburban


What I see the most often is a stalled engine with a loss of spark when driving. Once the engine cools off it will sometimes start and run fine for a short while then do the same thing again. Often, but not always, the pickup up coil or ignition module [both are under the distributor cap] have to heat up quite a bit before they will act up. I replace about 10 ignition modules for every one pickup coil but either one can cause the same identical stalling problem. I keep a few known good modules around as test units so I can just replace a suspected bad module and road test it to see if it works. Another thing that can go wrong in these distributors are the magnets built into the pole piece. A weak or cracked magnet can cause all kinds of odd problems such as stalling when placed in reverse, misfires over 1,000 rpm, etc. Worn bushings in the distributor can also cause problems. As far as a specific test you can do to see which part is failing? I wish there was a relaible one. I've tried using a lab scope and module testers to diganose the culprit but you have to catch the problem as it's happening for those tests to be accurate.

Jun 17, 2010 | 1996 GMC Suburban

1 Answer

Dealer said i need a new engine because of a sludge problem and a misfiring piston...could this be true? my check engine light is on and the car stalled out twice at a toll booth.


It is doubtful that your engine needs to be replaced. Pistons don't fire, the spark plug that screws into the cylinder is what fires. Sludge may well be building up in your engine but I seriously doubt there could be that much sludge as to stall your engine at a toll booth...especially on a 2008...as long as you have done regular oil changes on the car.

Don't go back to that dealer, they're trying to rip you off. Take your car to a reputable mechanic and have them look at it. Don't tell them what the dealer told you...only tell them the check engine light is on. They will check the codes your car is throwing and then determine what is needed.

I repeat, DO NOT GO BACK TO THAT DEALER.

Dec 07, 2009 | 2008 Nissan Sentra

1 Answer

Engine knocking


Hi,
Good news is - I don't think you need a new engine.

As there are many moving parts that could create a knocking sound, it usually needs careful inspection to identify where it is from.
I will give a list of some of the causes and remedies. Yours will probably be one of them, but unless I was there - it could be any.

Loose exhaust component (causes rattles and thumps) - replace parts or joints.
Loose Engine mounts - Engine will move about a lot more than normal - Replacement of mounts.
Fraying Belts - causes continual ticking or slapping - Replace belts and check tension.
Timing is off - bad running, lack of power, pre ignition or knocking at low revs. Check timing belt - Replace, Tune engine.
Cracked valve - slight misfire worse at low revs - Replacement valves.
Clutch Problems - Broken spring or loose bolt - Check clutch plate - replace clutch plates.
Older engines - often accompanying smoke -
Broken Piston ring - continual ticking or occasional misfire - Replace Piston rings
Worn Piston bearings - Piston Slap - Replacement of all piston bearings.

Transmission Problems (only heard when in gear or with clutch out) - Broken gear teeth or worn bearings - Replacement of Transmission or rebuild.

Some of these remedies require engine removal and strip down, others are a simpler fix.

Dec 26, 2008 | 1990 Cadillac Fleetwood

1 Answer

Cyl #3 missing


Cracked spark plug, damaged worn plug cable, the clicking, thumping is a result of operator forcing engine to run out of synch, as result of electrical combustion loss. the fact the vehicle continues to run rules out any problem with fuel line - fuel components. Let us know the outcome please.

Dec 19, 2008 | 1998 Isuzu Hombre

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