Question about Mazda B2300

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My truck won't rev more than 3,000 rpm's or go faster than 40 mph. Idles okay , runs okay at low speeds and low rpm's. I can't even get on the freeway, takes a long time to pick up any speed.

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  • Mazda Master
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Hi:
A couple easy things to check out are your fuel filter and air filter. The fuel filter can be very restricted and cause a similar problem. , The air filter, not so much.
Plugged up catalytic converters can cause a loss of power too.! Hope you find your problem..

Posted on Jun 01, 2010

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  • Master
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Check our transmission fluid level. Run the engine until hot then wait 20 seconds and check the transmission fluid level on the dip stick (not to be confused with the engine oil dipstick). The fluid should look pink if it is caramelized and looks brown it is time for a full fluid change along with the filter (within the transmission). I strongly suspect the your fluid is low and the the transmission is a) unable to transfer torque from the engine to the wheels and b) the transmission via the ECU is limiting the engine revs as it does not have enough fluid to shift to higher gears. To top up the transmission fluid first get the right fluid (some transmissions can be really fussy about what they are prepared to take). Pour fluid down the fluid dipstick tube. Depending on how much fluid is missing the amount to add could be up to several litres.

Posted on Jun 01, 2010

  • Joseph Prosser Jun 01, 2010

    Just to make it clear first check the transmission fluid whilst the engine is running and the car is in 'drive', but held on the brake (have someone sit in the car with their foot on the brake for safety). Next check the transmission fluid with the engine off and car in 'neutral'. The first measure is the accurate measure of the fluid as the torque converter will be pumped full of fluid. The second measure should be greater than the first as the fluid will have drained from the Torque converter. If ever you the first and second measures being the same it indicates that the fluid pump input shaft has come to grief and no amount of topping up will help.

  • greg m Nov 23, 2013

    i'm looking at a mazda B2300 (1997) 5 speed and it is doing the same thing but no torque converter of course but the guy who has it says that the clutch was replaced in febuary . i'm leaning toward that it is the catalytic converter is the issue for a quick easy check can i just disconnect the converter as a no cost troubleshooting step

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Posted on Jan 02, 2017

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NGEC0549
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NGEC0549S01
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SEF976U
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SEF978U
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GI
MA
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LC
FE
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MT
AT
TF
PD
AX
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BR
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HA
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2 Answers

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The rpm's will repond faster in a manual than an automatic.

In a manual the engine supplies the power required directly to the gear that you have selected thus the engine rpm's will increase or decrease as needed.

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