2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

car wont idle

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Old May 17, 2010 | 02:44 PM
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new2mazda's Avatar
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car wont idle

ok, i just installed vmount and new secondary injectors. emissions are removed except for BAC. the connector on it broke so i have it capped off till tom when i get a new connector. (when i get it reconnected should i connect it to UIM?)

i can start it up no problem, but i have to keep foot on gas to keep it going, and above 2k roughly. my boost gauge shows -22 vac where before everything it had -18vac and ran and idled fine. i have not reconnected the coolant temp sensor yet and have not reconnected the coolant sensor on top of rad yet either. was told the higher the vac the better so wtf?

i did run the car with the new secondaries before i did vmount and it idled fairly well. i have had a bad studdering problem higher in rpms and i am in process of having a friend do my timing and getting a good tps. i am just trying to solve the idle issue so i can get it to him
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Old May 17, 2010 | 11:54 PM
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Water thermo sensor? ECU uses it to control mixture vs. temp
Vacuum leak?
Boost sensor?
How are you controlling idle without a BAC valve? If i pull the connector off the BAC valve on my car, it runs very much as you describe...
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Old May 18, 2010 | 12:18 AM
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with throttle...? idk if you do emissions removal of bac how do you control it?
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Old May 18, 2010 | 01:08 AM
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and where do i connect the vac to on the bac when i get it reconnected since i removed the top mount? or do i just cap it all off?
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Old May 18, 2010 | 06:36 PM
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bac is plugged back in, still runs like *** though just lil better response. do i cap this on bottom of bac?

this is wat i have capped off on tom from top mount removal with the red covers


and this is a vid. of first without the bov recirc to intake blocked off sigh and the bac vac not blocked. then at the end with it all plugged up. showing 22 vac

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