B2000 loses power when accerating

PDXB2K

MEMBER
2000 MAZDA TRUCK

Hi Folks,

I have a 1984 Mazda B2000 2.0L 4 cyl 5 speed, 2wd truck. It has 120k miles.

Over all, it's in good shape and runs pretty well.

Lately, when I accelerate and press the gas down, in 3rd, 4th and 5th gears, 40 - 60mph it will start to diesel and chug and lose power when I press the gas to the floor to accerate. I have to back off the gas and hold my foot at 1/2 to 3/4 for it to regain it's composure and cruise at 55 - 60mph. It runs fine at lower speeds, 10 - 45 in 1rst - 4th gears.

Any ideas what might cause this? Bad wires? Sparkplugs? Gap? Or, could this me more involved?

any ideas, comments or suggestions for troubleshooting this would be a great help.

thanks

3 Replies

RASMATAZ

MECHANIC
75,992 POSTS

When was it last tuned-up

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Friday, June 1st, 2007 AT 5:23 PM

PDXB2K

MEMBER
2 POSTS

Hi,

Thanks for the note. I'm not sure when it was tuned last. Perhaps 2003, so about 4 years ago. The sparkplugs were lose, but clean when I inspected them. The cap looks ok, but I haven't take it off to check the rotor.
The wires are. Zip tied across one another, and not using the nice plastic cable management OEM organize that mazda has on the head. I wondered, can cap wires crossing one another cause surges, spurting and diseling when accelerating?

Cheers

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Friday, June 1st, 2007 AT 8:39 PM

DANCARLSON

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50 POSTS

If the engine smokes a bit, look at the catalytic converter. If it is starting to get plugged the out flow of gasses will not be fast enough to keep up with the engine and it will cause the engine to back up. I have had it happen to a Dynasty that I had, a friend of mine had the same thing happen to his 2200. How can you find out, just keep driving it the way it is, if the catalytic converter is plugging up soon you won't be able to get up to hwy speeds. Once it is unplugged the truck will run like new with more power than you have ever had.

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Saturday, June 2nd, 2007 AT 5:40 AM