I have a 94 mazda b 3000 pick up it is using a lot of gas put new fuel pump new fuel filter and new plugs and wires wen its idling it shakes the whole truck any ideas thanks

Jerry Ferrell

Asked by Dec 04, 2014 at 06:14 PM about the 1994 Mazda B-Series Pickup 2 Dr B3000 SE Standard Cab SB

Question type: Maintenance & Repair

8 Answers


you should scan for computer codes, but I suspect a bad fuel pressure regulator.

Jerry Ferrell

No check engine light on u can scan with out it being on?


yes, you can. sometimes in the old OBD1 computers there will be a code without a light. unfortunately, sometimes in those pre 1996 systems the lights dont help much but with that weird idle you may have a code stored. wont hurt to check. you should be able to use a paper clip jumper to get the check engine light to flash. you count the flashes to read the code. but you have to do it correctly. there are several good vids on youtube. google it and see what ya get.

Jerry Ferrell

Wat about the idle control valve

2 out of 2 people think this is helpful.

it is possible that you have an IAC problem, you could try cleaning it. again, youtube.

Jerry Ferrell

Wat does that do ?

Jerry Ferrell

I just replaced the idle control valve the fuel pressure regulator the cap and rotor


Would be a good idea to check for vac leaks

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