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All of a sudden the truck acted like the engine shut off?

Tiny
NORTHPORTMAZDA
  • MEMBER
  • 14 POSTS
Well, it appears that the ECU was the culprit.
The truck actually seems to run and respond even better than it did before.
Thank you guys for all your help. I learned a ton.
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Tuesday, March 19th, 2019 AT 6:02 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,278 POSTS
Good to hear, please use 2CarPros anytime we are here to help.
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Wednesday, March 20th, 2019 AT 12:07 PM
Tiny
BSCHULZE
  • MEMBER
  • 1 POST
  • 1991 MAZDA B2600
  • 4 CYL
  • 4WD
  • MANUAL
  • 45,000 MILES
My mazda b2600 runs perfectly until it reaches 3000rpm then dies as if lacking fuel what could course this
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Wednesday, March 20th, 2019 AT 12:20 PM (Merged)
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Hi
Check fuel pressure 64-85 psi also check spark should be blue/white spark. Does truck start back up? Does it stall out like lose power or is it like the key was turned off?
Let me know
Thnaks for donate
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Wednesday, March 20th, 2019 AT 12:20 PM (Merged)
Tiny
TODD MCDERMAID
  • MEMBER
  • 2 POSTS
  • 1989 MAZDA B2600
  • 4 CYL
  • 4WD
  • MANUAL
  • 151,777 MILES
My truck was running fine, no problems. I started it, backed up in driveway and it just quit running like turning off the key. Tried to start again nothing. Checked for spark, no spark.
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Wednesday, March 20th, 2019 AT 12:20 PM (Merged)
Tiny
TOOOMANYTOYS
  • MECHANIC
  • 513 POSTS
Check the ignition coil for twelve volts a the positive side of coil. Here is a diagram:


https://www.2carpros.com/forum/automotive_pictures/462613_ignition_1.jpg

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Wednesday, March 20th, 2019 AT 12:20 PM (Merged)
Tiny
TODD MCDERMAID
  • MEMBER
  • 2 POSTS
No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, coil's resistances, distributor pick-up coil, ignition control module, cam and crank sensors and computer.
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Wednesday, March 20th, 2019 AT 12:20 PM (Merged)
Tiny
BELPREK9
  • MEMBER
  • 3 POSTS
Can you please let me know what you learned the problem was. My truck did the exact same thing when I put it in reverse. I have no spark and since it is so old the parts have to be ordered. I was curious coil or distributor.
Thank you.
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Wednesday, March 20th, 2019 AT 12:20 PM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,278 POSTS
It is a good idea to do both since they work together one can make the other go out. Here are guides and instruction on how to test the system:

Check primary resistance across positive and negative coil terminals. At 68°F (20°C), it should be 1.0 - 1.3 ohms.
Check secondary resistance between primary positive terminal and ignition wire terminal. At 68°F (20°C), it should be 6 - 30K ohms.
Check insulation resistance between either primary terminal and coil case. It should be 10M ohms or higher.
Replace coil if it does not test as specified.

Check out the diagrams (below). Please let us know what happens.

Cheers, Ken
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Wednesday, March 20th, 2019 AT 12:20 PM (Merged)
Tiny
BELPREK9
  • MEMBER
  • 3 POSTS
Ken, I have replaced the coil, distributor, cap and button, wires, and electronic ignition module. Still nothing. Any other suggestions for I just take it to the crushers? Thank you. (If I had a way to contact the initial poster on this thread, that is exactly what happened to my truck. As soon as I put it in reverse it quit. Do you have a way to contact him?). Thanks, Scott Smeeks
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Wednesday, March 20th, 2019 AT 12:20 PM (Merged)
Tiny
JONSMADSKILLS
  • MEMBER
  • 5 POSTS
  • 1989 MAZDA B2600
  • 4 CYL
  • 4WD
  • MANUAL
  • 157,000 MILES
I replaced plugs, wires, distributor cap, fuel filter, roter, and the truck cuts out every once in a while at a cirtain rpm. What could this be
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Wednesday, March 20th, 2019 AT 12:20 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Hi jonsmadskills, Welcome to 2carpros and TY for the donation

the truck cuts out every once in a while at a cirtain rpm. Do you mean it stalls or hesistate/bogs down severely?
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Wednesday, March 20th, 2019 AT 12:20 PM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,278 POSTS
Can you do me a favor and remove the neutral safety switch connector once the engine is running and then put it into reverse? It sounds like transmission range sensor is shorted out.

Check out the diagrams (below). Please let us know what happens.

Cheers, Ken
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Wednesday, March 20th, 2019 AT 12:20 PM (Merged)
Tiny
JONSMADSKILLS
  • MEMBER
  • 5 POSTS
It bogs down severely. Kinda like a hard jerk.
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Wednesday, March 20th, 2019 AT 12:20 PM (Merged)
Tiny
BELPREK9
  • MEMBER
  • 3 POSTS
Sorry Ken, I did not explain my response very well. After my truck quit running (put it in reverse and it quit about three weeks ago), it would not start again. I thought maybe the fuel pump, but it was getting fuel. Then I saw the above question from Todd Mc Dermaid and checked for a spark in the spark plug. No spark, so I replaced the distributor, cap, button, coil, and ignition module and still no spark. Fuses all seem okay, but do not know where to check next. I will try to look for the neutral safety switch. This is a 1991 Mazda B2600I Extended Cab 4x4. Thanks for your input, Scott
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Wednesday, March 20th, 2019 AT 12:20 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the fuel pressure if its within specs and test the airflow and throttle sensors-
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Wednesday, March 20th, 2019 AT 12:20 PM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,278 POSTS
This sounds likes the main control relay is not working or the connections inside the relay are shorted.

Here is a guide and the location of the relay:

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Check out the diagrams (below). Please let us know what you find.

Cheers, Ken
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Wednesday, March 20th, 2019 AT 12:20 PM (Merged)
Tiny
JONSMADSKILLS
  • MEMBER
  • 5 POSTS
Ok, will do, then ill get back to you.
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Wednesday, March 20th, 2019 AT 12:20 PM (Merged)
Tiny
WAYNE PEDERSEN
  • MEMBER
  • 4 POSTS
  • 1993 MAZDA B2600
1993 Mazda b2600

Turns over fine but dies right out. Won't stay running. Have replaced fuel pump and filter. Seems to be getting plenty of fuel. If I spray starting fluid into the throttle body, it stays running until fluid is used. Need some ideas what to try next.
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Wednesday, March 20th, 2019 AT 12:20 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check and test the fuel pump relay and also check for injector/s pulses.
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Wednesday, March 20th, 2019 AT 12:20 PM (Merged)

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