1997 Mazda 626 Logo
Lex Rex Posted on Jan 07, 2011
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1997 Mazda 626 2.0 DOHC New timing belt, dist., wires, plugs, crank sensor, air filter, cats, air intake sensor and sundry other little things. It dies suddenly on the freeway. It runs perfectly otherwise. It started up after 10 minutes the first time, 2nd time had it towed home and sat in garage for about an hour, then it started right up. I'm afraid to drive it until it's been fixed. NO CODES are showing. I believe the spark ceases, as I can smell fuel from cranking. Checked distributor cap, looks perfect inside. What could it be?ube slightly so it would thread to the new exhaust man. Also, I extended the wire to 2ndary O2 sensor, because the fitting is farther down on the pipe with the new cat. But I used heavy copper wires, and soldered all connections, and put heat-shrink tubing on all connections as well. Tied the wire up away from heat of the exhaust too. I don't believe it's relevant, just mention it as one of 2 things that changed from when before it started this. Can anyone help? Thanks One thing: I had to bend the EGR t thanks

  • Lex Rex
    Lex Rex Jan 10, 2011

    My text was messed up in the question,; what I was trying to say is that I had to bend the EGR tube up slightly so it would meet the fitting on the exhaust header, which was positioned a bit differently from the original manifold
    Well, I do smell fuel, which makes me believe it's not a fuel issue.

    And one thing I completely forgot to mention is that when the engine died on the freeway, the tach fell to zero. This is while the engine was turning at about 3000 RPM. (Manual Transmission).

    How can this happen, except in a case where the ignition impulse is gone? Just a conjecture, and this is why I believe the fault MUST lie in the distributor. How do I troubleshoot this?



    The distributor comes with a heat shield attached to it, which is supposed to protect it from the intense heat at the manifold. What bothers me is that this will be distributor #4 in this car.

    Does this California exhaust header, which is made from welded steel tubing, dissipate heat as well as the original manifold, which is cast iron? If not, might this be what is happening, that the module is fried from its proximity to the exhaust manifold? ( The distributor on this engine is snuggled up really close to the exhaust manifold). Just a thought.
    Today, I drove down to my Town Center to the store, then on the way back the car died and now won't start at all.
    You know, I just have to believe it's in the distributor somewhere, which means I have to replace that--again.
    If anyone believes that I'm wrong about this, please let me know.
    Thank You!

  • Lex Rex
    Lex Rex Jan 10, 2011

    The trouble with testing to find where the fault lies is that the fault condition has to exist at the time you're trying to diagnose it. If the car dies, then starts back up 1/2 hour later, you cannot diagnose it-- that is, unless the ECU pops up a code, which mine did not, as I said before.
    Anyway, this nis why I'm just guessing, because guessing is all I can do...

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raj somaiya

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  • Mazda Master 5,370 Answers
  • Posted on Jan 07, 2011
raj somaiya
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When the car stops driving, at that time check the starter, if its got very hot, then this can be starter over heating issue. There are many other things to be checked.

Try this troubleshooting: ----If your engine cranks normally but will not start because it has no spark, or it stalls and won't restart because it has no spark, the problem may be due to any of the following:

1) A bad pickup inside the distributor, a stripped distributor drive gear (common problem with plastic distributor drive gears), broken, loose or corroded wires from the pickup to the ignition module or PCM. 2) A bad crankshaft position (CKP) sensor or broken, loose or corroded wires from the sensor to the PCM. 3) A bad ignition module or A bad ignition coil .

4) A bad rotor or distributor cap (cracks or carbon tracks that are allowing the spark to short to ground). 5) Faulty ignition switch.

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

You can also do a test to confirm the problem .The procedure to do the test is as follows: --

If your engine has spark plug wires, disconnect one of the plug wires from a spark plug and place the end of the wire near a metal surface on the engine. Then insert a small Phillips screwdriver into the end of the wire (the plug boot), or a small bolt or nail to provide a conductive path. Then crank the engine and look for a spark to jump from the screwdriver, bolt or nail in the end of the plug wire to the engine. If you do not see a spark, there is an ignition problem.

OR---If your engine has a coil-on-plug ignition system with no plug wires, In that case remove one of the coils from the spark plug and insert an old spark plug, a spark plug tester or a screwdriver into the end of the coil. Ground the spark plug or plug tester to the engine, then crank the engine and look for a spark. No spark indicates an ignition problem. Possibilities to be checked in this problem are as follows:-- If the engine has no spark, check for voltage at the coil positive terminal when the ignition key is on. If NO voltage, then problem is on the trigger side of the coil (pickup, crank sensor, ignition module or primary wiring circuit).But If there is NO voltage at the coil itself, then in that case the problem is on the supply side (the ignition switch or ignition wiring circuit). But if the coil has voltage, then problem may be a bad high voltage output wire from the coil to the distributor, hairline cracks in the coil output tower, or cracks or carbon tracks inside the distributor cap or on the rotor. ------A car that cranks over but doesn't start, in many cases will be due to a bad fuel pump, a broken timing belt, an inoperative cam sensor or crank sensor. Also these problems are related to faulty spark plug. Check the spark at spark plugs when you start the car. Do you notice any spark. Actually you should see. If in case there is no spark then it's a spark plug problem. Also the coil pack gives power to spark plug. So check the voltage at coil pack. It will show 12 volt. If there is no voltage noticed at coil pack then its faulty coil pack that has to be replaced. If all the possible options checked out ok then check the car starter. The starter gets power from battery to start the car. If the starter is faulty then it will not let the car to start. Also check and confirm that there is fuel in the car. If its very low fuel then in some cases this causes the problem. Also check and confirm that fuel pump is functioning properly and the fuel filter is not clogged. One of the easiest ways to check for a fuel pump related problem is to spray a little starting fluid into the air intake while trying to start the car. If the car starts momentarily, then there's a good chance the fuel pump is not working or the car is out of gas. You can also listen for the fuel pump's humming sound when the key is first turned on. Also if a inoperative fuel pump is suspected, a good technician will always check to verify there is power and ground being supplied to the pump, to eliminate the possibility of a bad relay or electrical issue. Fuel pressure can be checked with a pressure gauge and if there is pressure, pulse can be checked at the fuel injectors in several ways including the most common, with the use of noid lights. If the injectors don't have pulse the engine won't start.---------- This troubleshooting tips will help you to solve the problem. Thanks. Helpmech.

  • raj somaiya Jan 11, 2011

    Yes it can be problem with distributor but it has to be checked first,other thing to check and confirm is fuel pressure and ignition switch. Also get the battery to starter connections checked.---------- This should help.Thanks.Helpmech.

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