I like how the haynes manual doesn't tell you about stuff like hard vacuum lines bolted to the surge tank. :squint: I nearly ripped them right off in a fit of fury.



Anyway, what does the BAC do? advantages/disadvantages to removing it? *nevermind, found answer in pinned topic*



Where is that blasted ECU ground that people suggested I need to reground in order to [maybe] fix the 3800 rpm stutter? I'm pretty sure someone had a pic.



How do I know if my car is a California model? There was one part the manual said to remove (except on Cal. model), and it wasn't there. I think it was the cold start assist thing bolted to the passenger side of the surge tank. Any tips?



How do I clean the intake for the secondary ports? It's looking pretty nasty in there. Anything that goes in there ends up playing with the rotors, right? not as important, but how do those areas (6-port intake) get so much dirtier?



I'm proud of myself for not stripping any bolts. yay.

Here's a thread with some pics of that engine ground that Mike pointed out: engine ground under intake



For the auxillary ports (I take it your talking about the lower intake manifold, not the actual engine ports, right?), I think they get dirtier due to the oil metering lines spraying oil in... then again, there are two also on the upper intake that make the runners dirty as hell too. To clean them, I started by spraying it good with carb or brake cleaner, then used a flapper bit on my rotary tool which you can use also for mild port/polishing.

cool...I know where that is



If I get to cleaning there, is it ok if the stuff falls into the LIM? should I stuff a rag down in there ahead of time?



where can I find a block off plate for the bac? and if I remove it, does that include the electrical thing that plugs into it, and is supported by a metal bracket? also, can I remove that air pipe that runs along the top backside of the TB and dynamic chamber?

www.k2rd.com sells nice and cheap block off plates...they come with hardware too

I meant with the LIM off the car. I'm not sure about the BAC now, I think I'm going to leave mine on after reading pengaru's post in the TB mod thread.

I meant with the LIM off the car. I'm not sure about the BAC now, I think I'm going to leave mine on after reading pengaru's post in the TB mod thread. [/quote]

I'm thinking the same about that other thread.



Is the LIM the same as the "surge tank?" Or is the LIM what the surge tank connects to? (what the manual refers to as the surge tank is that curved, 4-chambered part, right?)

lim = lower intake manifold; its the part the actually bolts to the engine



mike

what's the best way to clean out the intake to, and the secondary ports?



and by best I mean most efficient (effective but not too difficult)

Baldy, when I mentioned above about the carb cleaner and rotary tool, I was talking about the lower intake manifold off the car. Are you asking about the secondary ports on the block itself?? If you are I have no clue, I haven't touched them.

i like to pull it off and clean it with carb cleaner, or the solvent of your choice



mike

hopefully it's easier than getting the throttle body off (not that it was that hard, anyway, just trying to complete this inside of 20 days)



2 new questions to keep you on your toes:



there is something that comes out of the exhaust manifold, I'm thinking the o2 sensor (but I'm not sure), and it has a wire that ends in a greenish plug, which isn't plugged into anything. Should it be plugged in somewhere?



The wire that goes to the ECU ground in the pic listed above, the one that commonly has problems, comes from a branch of three wires. There's the ecu ground wire, a thicker wire (possibly a bunch wrapped up, I can't recall), and a third that's in the middle. This third wire is a single wire, very small, has about 10 inches on it, then has a very small black plastic fitting of some sort (shaped like a crushed soda can), then looks like it was cut off. Any ideas?

i got a k&N intake

i like

cost me $150 though did i get ripped off. my job sells it for $237

that is the o2 sensor, there should be a matching plug somewhere.

i think that ground has 3 wires?



mike

where should the plug for the o2 sensor be, and how much would it noticeably affect performance with it off?



so are you saying I should just ground that wire?



and rotaryrocket7, what the hell are you talking about?

i cant remeber where to 02 sensor plug is on those, i think it hangs out at the rear of the intake manifold.

i think that wire is a ground, but a pic would be good.

3. i dunno



mike

The O2 sensor wire does plug in right under the upper intake man toward the firewall... I remember ******* my hand up with that. I've heard many people say their car runs fine without it plugged in but whatever. That wire with the black plastic on it, does it have a metal 2 pronged end on it? I found one like that that was just hanging there and noticed on my other car that it is indeed a ground. Its nice to have two engines to compare when the 86 is stock and I'm ripping apart the 88.

the wire with the black plastic ends in what looks like someone cut it off or it got ripped off



I did more looking: the wire in question comes off of a branch of wires including: both wires to the primary fuel injectors, a wire that leads to behind the alternator, the ecu ground at the base of the tb support, and this funky wire with the black plastic thing



and I'm beginning to think there's a typo in the Haynes manual...they keep referring to the upper fuel rail as the primary, and lower the secondary, even though the secondary injectors (the outer-most ones, right?) are on the "primary" rail

maybe the funky black plastic wire is where your O2 wire is to plug into.... I don't know, your losing me man, lol.

ah, I'll study the diagrams more, otherwise, screw it. It ran good enough for me before I got into this.

have any pics of these wires with the manifolds off?

https://www.nopistons.com/forums/pub...IR#>/dunno.gif well, I'd have to get a camera from my dad, go to my house, take the picture, go back to his house, and upload it....we'll see if that happens this weekend

yep, that is supposed to connect to the O2 sensor.



hugues -

ok, I have a parts car, I just didn't want to remove the whole intake on it to figure out that wire...but since the o2 sensor is accessible, I'll see If I can rip the plug off of it and use it



any idea how to tell if it's a Calif. model?

About the BAC valve:



I would advise against taking it out since it compensates for any electrical load put on engine at idle (especially if you have AC and power steering).



Many pple have taken it out though but usually their idle is set higher than stock to prevent stalling when electrical load is put on engine at idle.



Also, it's not always a good idea to change too many things at the same time. If something goes wrong, then it's harder to figure out what went wrong. I find it safer to do 1 mod at a time.



Hugues -

yeah, I decided to leave it on...the only mod I'm doing is the tb mod, everything else is replacing hoses, cleaning manifolds, seals fixed....preventative maintenance

that spare wire was for the o2 sensor...the black plastic thing was what held the wire in the male end of the plug...thanks!