1999 B4000 shifting problem

patb · 09-26-2009, 09:43 AM

Mazda B4000 4.0 litre automatic trans with 195,000 miles.

When under load I feel two or three jerks or hesitations. example: Going down the highway at 50 or 60 mph and press on the accelerator, the
tackometer stays at about 2500 rpm and I feel a jerking or hesitation two or three times then goes away. But if I go down the highway at 50 to 60 mph and depress the accelerator and the tackommeter jumps to over 3000 rpm(I assume it has down shifted), I do not have the jerking or hesitation.
I am assuming it is trying to down shift - but is not engaging fully instantly. Took it to a transmission shop - They told me it was not the transmission but was a plugged catelytic converter. Replaced it and have the same problem. I still believe it is something dealing with the Automatic transmission. Any suggestions?

patb · 10-10-2009, 06:24 PM

The problem ended up being a clogged catalytic converter. The B4000 has two - I replaced both and no longer have the problem

gmctrucks · 10-10-2009, 10:47 PM

Thanks for sharing the info maybe this can help us down the road.

bradrhale · 10-11-2009, 07:34 AM

apology for not getting a response to you. but am glad that you posted a repair back with us. i promise we will do better next time.

duey · 10-21-2009, 05:08 PM

I was gonna say bad tourqe converter cause I knew someone that had that same type of problem and thats what it turned out to be. But then I was wrong. I hate when that happens.

09-26-2009, 09:43 AM	#1
patb Junior Member Join Date: Sep 2009 Posts: 3	1999 B4000 shifting problem Mazda B4000 4.0 litre automatic trans with 195,000 miles. When under load I feel two or three jerks or hesitations. example: Going down the highway at 50 or 60 mph and press on the accelerator, the tackometer stays at about 2500 rpm and I feel a jerking or hesitation two or three times then goes away. But if I go down the highway at 50 to 60 mph and depress the accelerator and the tackommeter jumps to over 3000 rpm(I assume it has down shifted), I do not have the jerking or hesitation. I am assuming it is trying to down shift - but is not engaging fully instantly. Took it to a transmission shop - They told me it was not the transmission but was a plugged catelytic converter. Replaced it and have the same problem. I still believe it is something dealing with the Automatic transmission. Any suggestions?

10-10-2009, 06:24 PM	#2
patb Junior Member Join Date: Sep 2009 Posts: 3	Patb The problem ended up being a clogged catalytic converter. The B4000 has two - I replaced both and no longer have the problem

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10-10-2009, 10:47 PM	#3
gmctrucks Senior Member Join Date: Nov 2006 Location: Houston,Texas Posts: 4,030	Thanks for sharing the info maybe this can help us down the road.

10-11-2009, 07:34 AM	#4
bradrhale Senior Moderator Join Date: Apr 2006 Location: Texas Posts: 8,021	apology for not getting a response to you. but am glad that you posted a repair back with us. i promise we will do better next time.

10-21-2009, 05:08 PM	#5
duey Junior Member Join Date: Oct 2009 Posts: 8	I was gonna say bad tourqe converter cause I knew someone that had that same type of problem and thats what it turned out to be. But then I was wrong. I hate when that happens.