Question about 1997 Mazda 626

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97 mazda 626 dx 2.0. manual shift, crank but won't start,install used engine w/less than 50k miles, after original engine lose power replace valve stem seals, timing belt, w/pump,oil pump,distributor cap & rotor,wires,fuel pump, MAP sensor(after code), timing marks are aligned correctly.engine starts and run on 3 cyl after 1 plug is removed,no matter which plug/wire,but after re-installing plug,engine cranks but won't start,i am getting fuel and the wires are sparking at plugs,should i replace ECU?.

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  • graham0119 Jan 11, 2011

    Car still doesn't start after replacing ECM and a new crank position sensor and also the throttle position sensor,the car still starts and run on 3 cyl,after removing 1 plug, while running i hook up handheld computer show trouble code P0335 which is the crank position sensor.

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  • Mazda Master
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First check the spark plugs.

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.------Getting this all possibilities checked will point towards the exact faulty part which is to be replaced.

But if all this possibilities checked out ok,then yes its the ECU fault.Get the ECU checked and replaced.----------This should help.Thanks.Helpmech.

Posted on Jan 02, 2011

  • raj somaiya Jan 11, 2011

    Get the timing checked for timing chain.If its over stretched or got loose then it can be the issue.Also if its very old then it has to be replaced.Get this checked.
    Thanks.Helpmech.

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My 93 nissan p/u had that issue, but the tps was replaced and it takes 2-3 revolutions on the motor and it's running smooth, hot or cold.

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It sounds like your starter motor is going out. More specifically the solenoid on your starter motor, and since the they are both connected these days unlike the older vehicles you like need to replace the whole starter motor. I hope this helps you out.

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1 disconnect battery negative (-) cable(make you have radio code if any) to reactivate radio, which works anyway if code was never set.

2 press brake peddle for 5 seconds

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Not a solution, but definitely bad news.

Unfortunately, your symptoms are all too typical of 1997 626's with the automatic transmission, especially those with the V6 engines. Owners have been reporting OD lights flashing and hard shifting as early as 20,000 miles, and total transmission failure as early as 40,000-60,000.

There are also many reports of owners having the transmissions rebuilt only to have them fail again in 12,000 to 20,000 miles.

This transmission, actually a Ford CD4E, was installed in many mid to late 90's Mazda's. NHTSA has over two hundred complaints on the 1997 626 alone.

Conversely, Mazda used a 5 speed manual transmission of their own design in these same model year 626's, and it is not unusual for them to go well beyond 200,000 miles without so much as a hiccup.

There are many Mazda forums out there over the years where people have attempted to launch a class-action lawsuit against Mazda to force them to announce a recall for the automatic transmission.

Mazda North America Operations claims that there were never enough complaints lodged with them to justify a recall. It appears they managed to avoid recall by instructing their delears to tell customers these symptoms were "typical of Mazda transmissions" and to document these concerns as complaints.

Unfortunately, once you start experiencing the type of problems you have, you can only expect it to get worse. If it's any consolation, it's nothing that you have done to the car, or could have been prevented, its poor design and ECM programming. Don't let a dealer or transmission shop try to tell you differently.

Try Googling, "1997 Mazda Transmission Complaints", and you'll get sick over the number of hits you get.

Here's a link to an article that's sure to get your blood boiling:

http://www.associatedcontent.com/article/23810/before_you_buy_that_used_mazda_626.html?cat=27

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