Question about 2008 Pontiac Grand Prix

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What will cause my car to fire but not start?

My care has spark, good fuel pressure, and the engine has compression, but it will not start. It doesn't show any codes either. Any ideas on what to troubleshoot?

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  • Expert
  • 95 Answers

Check the crank sensor maybe this can cause the car to stall/cut out
and not start if its faulty without knowing more can only guess it may be that

Posted on May 07, 2014

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Posted on Jan 02, 2017

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  • 26 Answers

SOURCE: My 1989 Pontiac Trans Am

Come to find out after spending $560.00 on electric parts that were not needed, the number 5 fuel injector was shorting out causing the engine not to start. It would turn over but wouldn't catch. I unplugged the injector and it started right up. I let it run for a bit and while running, plugged it back in and sure enough, the engine stalled. This particular engine had us going crazy. We thought if an injector went bad at least have the engine would run. Apparently this one has a safety mechanism on it so half the engine won't warp for working while the other half don't. The injector will be replaced very soon and will be back in perfect running condition.

Posted on Sep 13, 2008

  • 1 Answer

SOURCE: We have a 2001 Pontiac

Notice if your SECURITY dashboard light is on when the key has been turned to the on position. If it is then your security feature needs to be reset.
The security feature will often come on when 2 failed attempts to start the car have occured or the battery goes dead or is replaced.
I believe to reset the security feature you have to place the key in the ignition and turn to the on position without starting the car and leaving it there for 10 minutes. Just wait it out and the light will go out. Then take the key out and try restarting.
I've been through this many times. You need a good battery to leave the key on for 10 minutes.
Take it easy!

Posted on Jun 28, 2009

  • 107 Answers

SOURCE: 1995 pontiac bonneville SE 3800 engine Vin K.

fuel filter

Posted on Jul 20, 2009

drsinister69
  • 2317 Answers

SOURCE: 97' grand am starts and stalls ,fuel pressure ok

I'd go with replacing the fuel filter, especially if it hasn't been replaced. It should be replaced every 12,000-20,000 miles. I would check the fuel pressure also. These 2 items are not monitored by the computer.

Posted on Apr 27, 2010

roniecon
  • 6918 Answers

SOURCE: 1998 Pontiac Grand Prix 3.8 won't start. Need some

Check for fuel pump pressure,you may have a bad fuel pump.

Posted on Jul 07, 2010

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WHEN I GIVE IT GAS IT START TO MISFIRE


Misfires are caused by one of 3 things-gas, spark, or compression-one of those is the problem. For gas, check the fuel pressure and see if it is at the right pressure for your car. Low fuel pressure will cause misfires. If pressure is good, it could still be an injector problem, like a clogged injector. If low pressure, suspect the fuel pump or the fuel filter.
For an ignition spark problem, check your spark plugs. Pull them out and inspect them for broken or cracked plugs, check the spark plug gap, check for oil fouled plugs. You may be able to isolate the misfire to a cylinder or two by the plugs condition. A misfiring plug or cylinder should show more black, sooty deposits than the other plugs. A normal firing plug will have a tan or brown colored insulator on the end with very little deposits. If the plugs are okay, clean them a bit if needed, and check for spark on the spark plug wire ends with engine cranking. Buy an inexpensive spark tester, or hold each spark plug wire metal end terminal 1/4 inch from a ground on the engine block, while cranking the engine. Wear a heavy glove to avoid getting shocked. Check that every cylinder is getting a strong blue spark to eliminate ignition as a problem. A weak, yellow or orange spark is an ignition problem, possibly a bad coil, or other ignition part.

If spark and gas is good, you may need to check engine compression. Any cylinder that has significantly lower compression than the other cylinders will cause a misfire, and set a misfire code. You should check for any trouble codes in the engine computer. A code reader or scanner would have to be connected to the diagnostic connector under the dash. What is "significantly lower" compression? About 15-20% less compression. Say you checked and had 150 psi compression in most cylinders. If one had 20% lower compression ( 150 X 20%= 30 psi, 150 -30 =120 psi, or same as saying 150 X 80%= 120 psi.), a condition like that can cause a misfire. I hope I have made sense here. Good luck, and post back what you find, or if any questions.

Apr 10, 2014 | 1998 Ford Windstar

2 Answers

My 97 toyota camry cranks but doesn't start.


If you have low compression you have only a few things that cause that. 1. you have a blown head gasket. 2. you have a cracked head. 3. your piston rings are shot. With a no start condition I can almost garuntee you have either number 1. or 2. If you wanna check the crank sensor, have someone spin the motor while you pull off a spark plug boot. If you hear/see it firing then the crank sensor is good. Crank sensors either work or they dont. If the crank sensor is bad, you will lose fuel and fire.

Dec 03, 2012 | Cars & Trucks

1 Answer

Started engine and was running rough Check engine lamp came on Used code reader and found code p0306 Remove plugs Compression test no.6 was 175 and the rest were 150 replaced spark plugs and retry Still...


You've done a great job of trouble shooting thus far. I would certainly suspect the injector after all of that. But, I didn't see anything about you replacing the spark plug itself. I would try that first as a crack in the insulator (even hairline) will cause mis-fires. If the spark plug doesn't fix the mis-fire, it cold be caused by a bad fuel injector, bad signal (like a loose harness or bad wire) to the fuel injector, or a leak or valve issue on that cylinder.

Nov 25, 2011 | 1994 Ford Mustang

2 Answers

2000 Eclipse GT turns over but doesn't start. Fires once in a while but won't run. Had timing belt replaced.


Hi, if the car turn over, and it don't start. Then it is like the engine don't get fuel. Or bad a spark plugs. Most common problem is the fuel pump going bad.

It could also be a bad fuse, but a easy way to check if the fuel pump is ok is to have someone stand at the back of the car when you turn the ignition. The fuel pump should make a buzzing sound for a few seconds. And if you don't start the car right away the fuel pump will stop.

If you don't hear any buzzing from the fuel pump/fuel tank then you have a bad fuel pump............

May 11, 2011 | Mitsubishi Eclipse Cars & Trucks

1 Answer

I have A chevy silverado and it is hard to get it to turn over. when it finally does turn over the truck runs fine.


Engine cranks normally, but it does not fire:
You turn the key to start and hear the starter motor crank the engine, but when you release the key, the cranking stops and there is silence. This means that the battery and starting motor are working properly, but the engine is not firing. If you continue cranking the engine over in this way, the battery will eventually run down and will need to be recharged, but the battery and starter are not the cause of your problem.
There are a number of causes for this type of no-start condition, the most common being that you are simply out of gas. Assuming that you have fuel in the tank, you will need to go through a series of tests to determine what is causing the problem. The testing procedure is as follows:---

Spark:---------An easy way to test for spark is with an inexpensive spark tester. This is a device that is readily available at most auto supply stores. You use it by simply holding it next to a spark plug wire. If you see the neon lamp flashing while someone cranks the engine, then you have spark and should move on to checking for fuel. If there is no spark, or a very weak spark, you will have to replace the spark plug or the coil pack.It has to be checked.

Fuel:
First step here is to listen for the fuel pump running inside the gas tank. When you turn the key to run, you should easily hear the pump come on, run for a few seconds to build fuel pressure, then turn off. If you do not hear it, it could mean that the fuel pump or circuitry is bad. (Fuel pump failure is a common problem).

Fuel injected cars are very sensitive to proper fuel pressure. If the pressure is off, even by a few pounds, it will cause noticeable performance problems, or a no-start condition. To check for proper fuel pressure, you will need a fuel pressure gauge that is suitable for your type of system. Or you can also get the fuel pressure tested at local car garage, If fuel pressure is low then its a fuel pump and fuel filter related problem.

Compression:

If you know that you have spark and fuel, the next step is to check for compression. For this, you will need a mechanic's grade compression tester that will screw into a spark plug hole. You will need to remove the spark plugs and use the compression tester to test the compression on each cylinder. If the compression is very low on all cylinders, that is a sure sign that the timing belt (or timing chain depending on the engine) has failed and will have to be replaced.

-------------

This troubleshooting will let you know the problem.Thanks.

Mar 01, 2011 | Chevrolet 1500 Cars & Trucks

2 Answers

How do i replace the oxygen sensor? we took it to autozone and they tested it and said it was the oxygen sencor it want start but battery is good everything else is lighting up it was putttt


Hi!

The O2 sensor should be on the Exhaust manifold or pipe.

Raise the vehicle and support it with jack stands and try to disconnect the electrical connector. Then unscrew the sensor from the Exhaust Manifold and you might need the O2 socket to do so as its available at any autopart store, Be careful no to damage the threads, then Try to put in the New O2 sensor and be careful with the head of the sensor not to damage it and the installation is the reverse of the removal. and connect the electrical connector back and start your car.

I still don't understand How an O2 effect your car starting because it has no relation with starting. But any how hope this helps and if you got any other questions Bro , Feel free. Good luck

Jan 22, 2011 | 1999 Oldsmobile 88

1 Answer

My car wont start,when i try 2 turn it over it makes a chhhhhhh noise,ive had the starter motor fixed so dont know what else it could be


Engine cranks normally, but it does not fire:
You turn the key to start and hear the starter motor crank the engine, but when you release the key, the cranking stops and there is silence. This means that the battery and starting motor are working properly, but the engine is not firing. If you continue cranking the engine over in this way, the battery will eventually run down and will need to be recharged, but the battery and starter are not the cause of your problem.
There are a number of causes for this type of no-start condition, the most common being that you are simply out of gas. Assuming that you have fuel in the tank, you will need to go through a series of tests to determine what is causing the problem. The testing procedure is as follows:---

Spark:---------An easy way to test for spark is with an inexpensive spark tester. This is a device that is readily available at most auto supply stores. You use it by simply holding it next to a spark plug wire. If you see the neon lamp flashing while someone cranks the engine, then you have spark and should move on to checking for fuel. If there is no spark, or a very weak spark, you will have to replace the spark plug or the coil pack.It has to be checked.

Fuel:
First step here is to listen for the fuel pump running inside the gas tank. When you turn the key to run, you should easily hear the pump come on, run for a few seconds to build fuel pressure, then turn off. If you do not hear it, it could mean that the fuel pump or circuitry is bad. (Fuel pump failure is a common problem).

Fuel injected cars are very sensitive to proper fuel pressure. If the pressure is off, even by a few pounds, it will cause noticeable performance problems, or a no-start condition. To check for proper fuel pressure, you will need a fuel pressure gauge that is suitable for your type of system.Or you can also get the fuel pressure tested at local car garage,If fuel pressure is low then its a fuel pump and fuel filter related problem.

Compression:

If you know that you have spark and fuel, the next step is to check for compression. For this, you will need a mechanic's grade compression tester that will screw into a spark plug hole. You will need to remove the spark plugs and use the compression tester to test the compression on each cylinder. If the compression is very low on all cylinders, that is a sure sign that the timing belt (or timing chain depending on the engine) has failed and will have to be replaced.

-------------

This troubleshooting will let you know the problem.Thanks.

Dec 08, 2010 | 1999 Ford Escort

1 Answer

1995 Mazda MX 6 2.5.\r\nReplaced head . All timing marks are on the dots, but still will not start. It kranks up, but won't start.


Engine cranks normally, but it does not fire:
You turn the key to start and hear the starter motor crank the engine, but when you release the key, the cranking stops and there is silence. This means that the battery and starting motor are working properly, but the engine is not firing. If you continue cranking the engine over in this way, the battery will eventually run down and will need to be recharged, but the battery and starter are not the cause of your problem.
There are a number of causes for this type of no-start condition, the most common being that you are simply out of gas. Assuming that you have fuel in the tank, you will need to go through a series of tests to determine what is causing the problem. The testing procedure is as follows:---
Spark:---------An easy way to test for spark is with an inexpensive spark tester. This is a device that is readily available at most auto supply stores. You use it by simply holding it next to a spark plug wire. If you see the neon lamp flashing while someone cranks the engine, then you have spark and should move on to checking for fuel. If there is no spark, or a very weak spark, you will have to replace the spark plug or the coil pack.It has to be checked. Fuel:
First step here is to listen for the fuel pump running inside the gas tank. When you turn the key to run, you should easily hear the pump come on, run for a few seconds to build fuel pressure, then turn off. If you do not hear it, it could mean that the fuel pump or circuitry is bad. (Fuel pump failure is a common problem).
Fuel injected cars are very sensitive to proper fuel pressure. If the pressure is off, even by a few pounds, it will cause noticeable performance problems, or a no-start condition. To check for proper fuel pressure, you will need a fuel pressure gauge that is suitable for your type of system.Or you can also get the fuel pressure tested at local car garage,If fuel pressure is low then its a fuel pump and fuel filter related problem. Compression:

If you know that you have spark and fuel, the next step is to check for compression. For this, you will need a mechanic's grade compression tester that will screw into a spark plug hole. You will need to remove the spark plugs and use the compression tester to test the compression on each cylinder. If the compression is very low on all cylinders, that is a sure sign that the timing belt (or timing chain depending on the engine) has failed and will have to be replaced.

-------------

This troubleshooting will let you know the problem.Thanks.


Dec 08, 2010 | 1995 Mazda MX-6

2 Answers

1997 Chevy Silverado 1500 4x4 will not start. Getting spark checked all fuses, changed rotar - spark plug wires,


Have you checked the fuel pressure? Fuel pumps are a common failure item on those trucks. Pick up a cheap fuel pressure gauge and hook it up to the shrader valve on the fuel rail. With the ignition on and you should have 55-65psi. Even if it's a few psi below spec it could stop the engine from firing.Once you determine the fuel pressure isn't adequate make sure you have a good power and ground at the fuel pump. If that checks out, time for a new fuel pump module. I recommend only replacing it with an AC delco unit, I've heard bad stories about aftermarket replacements.
You could also spray some carb cleaner or starting fluid in the throttle body and crank the engine over. If it runs for a few seconds after spraying starting fluid in you know you have a fuel delivery problem.

Mar 14, 2010 | 1999 Chevrolet Silverado 1500

2 Answers

The vehicle is firing but not starting


If your engine is turning over and you are certain you have ignition fire then I would next check for fuel pressure and if you have fuel pressure then check for engine compression.

Nov 04, 2009 | 1995 Honda Odyssey

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