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1986 Mazda B2000 not starting
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nreves
Novice
Oct 5, 2009, 7:11 AM
Post #1 of 2
(5919 views)
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1986 Mazda B2000 not starting
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i have a 1986 Mazda B2000, standard trans, 2.0/4 cyl. it has around 143k miles. It makes the crank up sound but wont turn over. this problem is intermittent with not starting being more common. about 7 months ago i had a similar starting issue and replace the start switch wiring and it worked great. i had a flat tire and had AAA come and fix it while they were there they also ran a battery check and it was good. recently the tach would oscillate randomly when i got up to around 3k rpm but the engine wouldnt really be doing the crazy rpms. Two days ago it just shut off while i was driving and it took me a few tries to get it started again. this morning i tried about 5 times and i couldnt get it to turn over. on the 5th time it started to sound like the crank was getting weaker so i stopped and left it alone. any help would be appreciated.
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Hammer Time
Ultimate Carjunky
/ Moderator
Oct 5, 2009, 7:20 AM
Post #2 of 2
(5913 views)
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Re: 1986 Mazda B2000 not starting
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All "crank, no start" conditions are approached in the same way. Every engine requires certain functions to be able to run. Some of these functions rely on specific components to work and some components are part of more than one function so it is important to see the whole picture to be able to conclude anything about what may have failed. Also, these functions can ONLY be tested during the failure. Any other time and they will simply test good because the problem isn't present at the moment.
If you approach this in any other way, you are merely guessing and that only serves to replace unnecessary parts and wastes money.
Every engine requires spark, fuel and compression to run. That's what we have to look for.
These are the basics that need to be tested and will give us the info required to isolate a cause.
1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the + terminal of the coil with the key on.
2) squirt a little starting fluid or fuel into the carb to see if it tries to start to tell you if fuel is the issue
3) If all of these things check good, then you would need to do a complete compression test.
Once you have determined which of these functions has dropped out,
you will know which system is having the problem.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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