Question about 2000 Mercury Grand Marquis

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Intermittent start problem

All the coils and sparkplugs have been replaced.

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Next time the car will not start use a can of spray starting fluid and spray it into the air intake of the engine, if the car starts you have a defective electric fuel pump inside the fuel tank.

Posted on Nov 01, 2012

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Intermittent misfire


misfiring can be many things, least of which would be a intake gasket. sparkplugs, sparkplug wires, coil, fuel injectors etc. if the check engine light is on then take it to an auto parts store and they can read the code and tell you exactly what it is

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The idle circuit on the KE and KF Laser carby engines is controlled by the ignition module inside the distributor. The symptoms are intermittent stalling. There are also windings inside the distibutor that should be replaced at the same time as the module because these can short out the module.

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2004 Dodge Stratus 2.4 DOHC. Turns over, won't start. Was misfiring and barely running. Code showed P0300, P2302, P2305, P0700. Found Coil Pack had a burned spot near the #2 wire and large crack between #2...


Hey Brian, please don't loose your calm! You CAN fix it!.

Look for a timing belt with a skipped tooth.
Another possibility is that your sparkplugs are not properly gapped or their internal resistor got damaged. (A too large gap will make spark too hard to jump, which ended burning the hole you saw. A too large gap is very difficult to jump and places a tremendous effort on the coil and plug cables. Some times resistor type sparkplugs get the resistor damaged or open, at first, the open circuit can be jumped (inside the damaged plug body) easily, but as gap grows, it will cause an excessive voltaje to damage the coil or wires.


An engine starter that drains too much current means that it is damaged and possibly its bearings are too worn, which places a lot of friction on them, and the por electric motor then has to draw a lot of amperes to turn, draining the battery. Bad starter cable or ground connection causes a high voltaje drop to the starter motor, lowering the cranking speed, difficulting engine starting too.

Finally, a NO SPARK with no voltaje at coil primary means the DIS module that supplies current to the coil went bad, possibly because the too high voltaje leaked from the sparkplug end of the coil into the DIS module, damaging its internal semiconductors.

So, you need to FIX the sparkplugs, then cables, then check the coil, connectors, and, when everything on the High Voltaje side is perfectly OK and cannot damage any newly installed replacement parts, then you can go and check/replace the DIS module. Hopefully, the leaked high voltaje didn't damage the computer or Engine control module, as it is expensive. Best luck, Amclaussen.

Oct 04, 2013 | 2004 Dodge Stratus

1 Answer

MAZDA CX-9 P0354 CODE


Cylinder 4. Each cylinder has it's own coil above the sparkplug.
If you have a misfire, it's probably a bad coil. But if it's an intermittent misfire, it may be the wiring to the coil. If it's intermittent, start the car and wiggle the wires to that coil. If you cause a misfire you need to check the wiring to the coil.
Goode luck.

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1 Answer

Diagnostic states 3rd cylinder mis fire


Hello, Depending on the Year of the car, the cars that had a sparkplug with a remote coil, you could have a bad sparkplug wire or a bad coil-pack or a bad sparkplug. For newer cars, the coil is attached to the sparkplug directly on top.

For those newer designs, the coil would need to be tested for that cylinder. Using an Ohmmeter, with 1 lead on top and the other on the tip which touches the sparkplug, it is a 10,000Ohm resistance.

Accessing the sparkplug coil is different for several engines. You may have to remove the Intake manifold to reach the coil and you may need to remove part of the fuel rail to remove the Intake manifold. Switching out a plug or coil is easy once you can get to it.

You can have your scans done free at Autozone, Oreillys, or Advance autoparts and they will clear the problem codes once you replace parts. I hope this Solution is very helpful to you.

Jun 18, 2011 | Mercury Marquis Cars & Trucks

1 Answer

I have a 94 Pontiac Grand Am SE 5 speed standard with the 2.3L SOHC Quad 4-138 4 cyl engine. It idles fine; but when you go and shift the car bucks and has little power. Better be going 30 mph before...


This sounds like it may be misfiring, the quad four engine is famous for misfiring theres a coil cover under the top plate where the sparkplugs go, if you remove the 4 bolts and pull it up you will see the sparkplugs and that cover will contain coils and coil cover and boots, i would replace the sparkplugs and the coil cover and sparkplug boots, heres some pictures of the parts, this is where i would start it a tune up, and also check air filter and replace fuel filter,johnjohn2_31.jpgjohnjohn2_32.jpg

Dec 10, 2010 | 1994 Pontiac Grand Am

1 Answer

97 Ford Probe GT not starting


WARNING: Risk of Electric Shock

Check your spark plugs and wires yourself. Remove one sparkplug at a time from the engine block, plug the wire back on, place the sparkplug on the engine or vehicle body so that the outer thread of the sparkplug would touch the body, or engine (GND) you can secure it with a cellotape or so. Turn the ignition key to the START position and when starter is spinning wach for high voltage sparks appearing between the body,engine or gasket and the tiny black end of the sparkplug called electrode. If there's a sparks, than it's fine, othervise try to get one working sparkplug and to retest this. If now it works then your sparkplugs needs to be replaced. Othervise check the resistance of the high voltage coil primary windings. this should be something between 0.2 and 10 ohms, when coil is disconnected from vehicles wiring. I just do nts remember the exact figure. If multimeter doesn't show anything, replace the coil, otherwise check if the supply current is flowing to the coil plug when IGN is ON. If it's fine then check the COM line at the same plug, using analog muldimeter is the easiest and not harmfull way to do this. If COM isn't comming You might need to go deeper into ECU, or even to replace it. If COM is fine then it would identfy that coil itself is faulty.

Update me about your progress

Good luck

Mar 20, 2009 | 1994 Ford Probe

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