Question about Mercury Grand Marquis

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Not getting fuel at fuel rails and no spark at plugs seems there is no power availile for plug in tester

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Check your fuses for any blown fuses. also check for power at the fuel pump, Usually you can hear the pump and everything else come on when you turn the key to the on position no start, if nothing comes on I would look into the key switch, let me know what you find ...

Posted on Oct 08, 2010


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Well, there are several basics your engine needs to start: Spark, fuel, compression, and correct valve timing. I am going to assume on good faith that your GT has the 3.4 liter V6. Here are a couple basics on checking fuel and spark:
GM usually puts a schraeder valve (looks like a tire air valve) on the fuel rail. This is where you connect a fuel pressure gauge to test the fuel pressure. It should be 52-59 PSI when you turn the key to run.
If your fuel pressure is good, remove a spark plug wire from one of the front 3 spark plugs. If you have a spark tester, connect it to the removed plug wire. If you don't have a spark tester, remove the spark plug. Plug the removed spark plug or tester into the plug wire. Touch the metal threads of the plug or tester to a good solid metal part of the engine using gloves or non-conducting (plastic) pliers. Have someone try to start the engine. Watch the gap at the end of the spark plug. You should see a bright blue/white spark and hear it snap every time it fires. If you don't, there may not be any spark getting to the engine. Diagnosis of the problem can be far trickier from here on out. You will need to be able to diagnose electrical problems in the fuel/ignition system to find the root cause of no fuel/no spark.

If you cannot hear the fuel pump run in the tank when you turn the key to run, try lightly rapping the bottom of the fuel tank with a hammer turned to its side (don't put a hole in your fuel tank!) while someone cranks the engine over. If the engine starts, most likely cause is a failed fuel pump. Don't expect the car to keep starting on a regular basis if it does start by hitting the tank. The fuel pump will need to be replaced.

Oct 17, 2013 | Pontiac Grand Am Cars & Trucks

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Crank over but wont start

First thing I would do is check the basics, verify you have adequate fuel pressure by hooking up a fuel pressure gauge to your fuel rail assembly, next after you have verified thats ok check if you have spark going to your spark plugs, remove one of the spark plugs and hook a spark tester up to the spark plug wire, observe as your cranking the engine around if you see a spark on the tester or not, next if that passes you may have a cylinder compression problem, remove all spark plugs and perform a cylinder compression test, if all the cylinders seem to have low or no compression you have a valve timing issue, check and see if your timing belt is in proper time with the timing marks or if the belt is connected and has not broken, if you have a no spark condition check and verify your ignition module is getting 12 volt battery power with a test light, if you have 12 volts there next look into the crankshaft position sensor make sure the ohm resisitance is within the proper spec for your vehical if thats not correct replace the sensor with a new unit, finally if you find you have no fuel pressure check the fuel pump relay and fuse and verify there both ok if you find these to be both good, you more then likely have a bad fuel pump and that will require removal of the gas tank for further inspection of the pump assembly....

Dec 10, 2010 | 1998 Chrysler Sebring

1 Answer

2001 Saab 95SE V6, will start, will not re start, wait 30 minutes, will start, is it an electrical problem, a relay, battery is good.

It could very well be a relay. You can test those with an ohmmeter. Are you not getting spark plug fire or not getting fuel pressure? You can remove one plug, place back on the plug wire, turn motor over and observe for spark. The end of the spark plug should be resting on a metal surface so you can see if a spark jumps from plug to metal surface. If you have spark you likely aren't getting fuel. You can place a rag over the fuel test port on the fuel rail after the cap is removed, then press in on the valve and see if there is fuel press. You can always get a fuel pressure tester or spark tester as well.

Jun 16, 2010 | 2008 Saab 9-5

1 Answer

Car hesitates plugs are new wires are new on board scan says wire problem or plug problem perhaps coil pack??

Check each wire from the coil pack to the spark plugs with an inline spark tester. If you find that each wire has correct amount of fire, then check the fuel pressure at the fuel rail for correct pressure to the injectors. If you find pressure correct on fuwl rail,then look for possible injector not working correctly.

May 11, 2010 | Dodge Neon Cars & Trucks

1 Answer

I have 1998 suburban and I cannot get the car to run

I would check for spark at the spark plugs with a spark tester. Also, I would check for fuel pressure at the fuel fitting, that fitting is on the driver side, towards that back of the intake manifold on the fuel rail.

Apr 28, 2010 | 1999 Chevrolet Suburban

1 Answer

While driving on the freeway my engine just stopped running, it did not make a noise,smoke, pop or anything. it has fuel from the pump to the filter to the fuel rail. it has spark at the distributor, and...

This usually indicates a broken timing belt/chain. This can be verified by doing a compression test. You can rent a tester from most auto parts stores. Disconnect the distriutor, remove all spark plugs. Install the tester in one spark plug hole, hold the throttle wide open, then crank the engine for 5 seconds. You should get around 180 psi. Anything lower then 150 and I would suspect the timing belt/chain.

Mar 04, 2010 | 1996 Nissan Sentra

2 Answers

My 96 blazer wont start it just cranks but wont start?

A typical engine needs mostly just gas and spark to run (besides air of course)
Sounds like the engine is not getting one or the other.

Fuel goes from fuel pump, to filter, to fuel pressure regulator, to fuel rail, to injectors.
You can test for fuel pressure with key on, at the fuel rail. There will be a test port on the rail that you can put a rag on top and push in the valve to see if there is pressure. (or use pressure tester)
If there is no pressure, check that fuel pump relay is working. (you can use an ohmmeter on relay to see if there is resistance). You can also test power to relay and to the pump with a voltmeter to see if pump is getting power. Or turn key to ON position and listen to see if you hear the pump turn on.

If you have no spark to any cylcinders, the crank shaft position sensor may be faulty which is very common in GM vehicles.

You can use an ohmmeter to test the sensor itself.
You can also get a spark plug tester to see if there is spark to each cylinder.
You can also remove one spark plug, plug back into plug wire, lay on top of engine so spark plug diode is 1/4" away from metal surface. Have someone else turn engine over while you look for spark. Do this to each cylinder.

Nov 16, 2009 | 1996 Chevrolet Blazer

2 Answers

Continues cranking. Wont turn over. what s my next step?

You mean it cranks but wont start (cranking and turning over are the same thing) When cranking, rap on the fuel tank, if it then runs, the pump is bad and will need to be replaced.

Nov 15, 2009 | 1990 Oldsmobile Silhouette

1 Answer

99 expedition wont start

there are a couple of ways.I would remove a plug wire from one of the spark plugs,useing a spark tester that you can pick up at your local parts store insert it into the spark plug wire and have someone crank the motor and you watch the tester.

Mar 09, 2009 | 1999 Ford Expedition

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