I took out the little reservoir that sat in the passenger corner, against the firewall on my 87TII. I was told it was just for cold starts and Mazda said it was a heap of ****, so I yanked my cruise control and the reservoir, and then capped the pipe that the reservoir was connected to (which was under the upper intake manifold). Now when I start the car and it's not warmed up, it'll start, drop RPMs until interior lights dim and it wants to stall, then idle at about 300RPm unless I tap the gas, then it'll bounce right up around 600-800RPM and read around 150 torr vaccum on my boost gauge and hang out till it warms up. My question is... Is that what it's supposed to do without the reservoir, should I have done something other than just cap off the pipe, and is the 150 torr normal? Because before it would idle around 1000RPM cold, read about 200-210 torr, and the raise up to about 1300RPM and same vac when warm. Thanks

 

well since no one knew the first time, I'll give this the bump and hope someone has some insight the second time around

 

I think there was more then one plug? if you just unpluged it and and caped the lines it won't effect anything. the bottle wasn't being used anyways. your problem is something un related.

 

well the reason I capped it was because it was blowing off under boost. When it blew off, it raised the idle. I assumed that's what the reservoir did (maintain a higher idle when cold). That's why I figured capping the line would make a lower idle when cold, and that and cruise control are the only things I took out, so I assumed it was one of the two

 

the bottle thing only does anything if it's under 0F. is it that cold there? other wise it didn't do anyway but sat there. if it's under 0F it injected some antifreeze into the throttle body to stop it from freezing.

 

You said you removed your cruise control...did you cap THAT nipple as well? Did you maybe nudge another vacuum line off its nipple somewhere on that intake manifold? The cold start makes NO difference to the car under any condition. You dont even have to cap it off. The valve on the intake only opens at 0F so any other time it is colsed anyway.

 

As far as I know, I didn't cap any nipples for the cruise, cause there aren't any, right? I can't see why there'd be a vac line for cruise, and it looked to me like there was an electrical connection and a throttle cable. I got both of those taken care of. I'll check for other leaks once I take it home again. thanks guys

 

Oh, wait, you have a t2, never mind. NA's(which Im used to working on and talking about) use a vacuum actuated cruise. The t2, since it hits boost, uses an fully electronic unit, since cruise actuators dont like boost :-)

Sorry for the oversight. You must have knocked a hose off or carcked one somewhere.