Another starts and goes dead thread

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09-05-10, 05:50 PM

jdonnell

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Another starts and goes dead thread

Well I have this starts goes dead issue unless I quickly push the acelerator pedal. Once it races to ~3K rpm it wants to die unless I push the pedal in a couple times, then it seems to be ok. No sign of vacuum hose issue, MAF sensor connector tight and air hose to TB looks ok. ?????????????

90 Vert MTX

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09-05-10, 06:18 PM

rotary_bünta

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fuel pump?

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09-06-10, 07:17 AM

jdonnell

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Dont thin its the fuel pump. Replaced it a couple months ago w/filter in tank and inline filter. It was Mazda OEM.

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09-06-10, 08:59 AM

Go48

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What mods to the engine? Have you removed the AWS--the emission stuff? More info might help.

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09-06-10, 12:23 PM

jdonnell

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100% stock. I think I found the problem. The double throttle diaphgram on the front of the TB will not hold a vacuum when I try to test it using a vacuum pump. So I think the diaphragm is dead and the TB gates that open want to slam shut upon start up. Not 100% sure because if I hit the gas a few times it will not die.

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