Mazda truck stalling, not re-starting

[Clint]

Hey guys, I’m new to posting on the forum, but have been reading for some time.

I own a 1994 Mazda B4000 LE 4.0 V6 pickup truck, runs nicely, & in pretty nice condition. But lately my check engine light has been staying on and the truck isn’t like normal. I’ll be driving it and park, run my errand, come back to start it and it starts, sounding like its a cylinder down. After a few hard revs it will go back to normal though. I’ve checked my plugs, wires, and all the basics & they all seem fine.

Every once in a blue moon I will be driving along, and all of a sudden it just dies, I pull over, park it, and try to re-start it, and nothing. It just keeps turning over. After about 10 minutes or so it will finally re-start though. This has happened about three times, and have all been in different scenarios. It’s happened sitting while idling, once going down a hill, and once with my foot on the gas. I also added half of a can of SeaFoam to my full tank of gas, and the other half of the can directly into the vacuum system to clean the injectors and such. The guys at O’reilley auto parts told me that this could possibly be a coil pack issue?

And lastly. There’s been a few occasions where I’ve driven it for awhile, come back to start it, and it turns over with no fire. Ill leave it sit for a hour or so, come back, and it will start right up. i think I’ve narrowed it down to possibly the fuel pump. Sometimes you hear it prime when the key is turned in the on position, and of course it will then start. But when it doesn’t start, it also doesn’t prime.

With all these problem happening at once its hard to figure out what the actual problem is. What do you guys think? Where should I start, and focus all my time?

Thanks in advance,
Clint

Topic

[Clint]

Yes. Same codes appear after resetting the computer. 03, 17

[Bill]

Sorry Clint…. I can only find 3 digit codes for your truck.

[Clint]

According to the Chilton, code 03 indicates Distributor (G1 Signal), and the malfunction could be a broken wire or a short circuit. Code 17 indicates a Heated Oxygen sensor, malfunctions being “The heated sensor output does not change from 0.55V 20 seconds after engine at 1,500 RPM”

[Bill]

My info is not even showing a distributor in your truck, just a coil pack “Strange stuff” The o2 sensor I might understand. Probably wouldn’t hurt to replace it. The heater may be burned out or it’s just getting tired.

[Clint]

Yes it is a coil pack, which Is why I was baffled. There’s a way to test it and I’m sure ill get into the o2 sensor tomorrow also.

Thank you, you have eliminated my main problem that always had me stranded on the side of the road.

Clint

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