Ok sometimes (like half of the time) my truck idles and every couple of seconds it misses, this is only when my foot on the brake. At first i thought it was the brake booster, but it only does it selective time and not when its cold (high idle). I checked all my vacuum lines and its seems to be kosher. Could it be my booster (220 bucks ouch) or something stupid?

 

I posted something earlier today regarding the exact same issue I'm having. I'm still waiting and hoping someone would know what it could be.
I hope it's nothing major for the both of us!

 

yeah thanks for the bump man

 

Are you sure there is not a miss in all cases? Take a dollar bill, hold it tight about 1/2 inch off the tailpipe, and listen for a loud pop. If the bill get's popped, then you have a miss no matter what.

I just dont see how a brake booster could cause a miss. A miss is almost always timing related. Plugs, wires, timing...that would be my next check.

 

When i take my foot off the brake, it stops, the booster using a vacuum and if there is a leak a car will surge, its happened in my crx. I can let me truck run at idle and it wont miss ever, as soon as I hit the brakes it misses every couple of seconds. A booster can cause this. (timing was done 3 weeks ago, plugs are good)

 

I'm gonna go ahead and say check the AIV if it's a second gen. when misfunctioning it will cause erratic idle. Second, check the signal generator in the distributor. That is if you have a second gen with a v6.

 

Year/Make/Model would help a ton. Meant to ask that before.

 

94 22re pickup 22re

 

Seriously - what model, year, engine, etc. auto tranny or manual.

 

22re manual tranny 94 4x4

 

When is the last time the fuel system and air intake were cleaned? There is no way this has anything to do with the brakes.

 

when your engine is up to operating temp and with your foot NOT on the brake what is your idle at?

if its more than 650-750 then you need to adjust it down.

 

it could be a booster ive had it happen before with my CRX,
the idle is kinda high but i dont know why this would affect the idle with brake, and i have new fuel filter installed

 

Please clarify: Is this a surge, or a miss?

 

My 91 22re did the same thing just before the head gasket blew. :pat:

 

I just changed out the headgasket, dont tell me that, its a miss
its runs then a miss like 5 seconds between it and only with teh brake on
sorry about the word usage

 

just adjust it back to factory spec and i bet you money the problem will go away.

 

Ill try this later, you let the truck warm then kill it and then start it and let it idle then adjust it right?

 

You guy's are not the first one's to have this problem, I think that was one of my first post questions. I am supprized you didn't find about 100 post on this by searching. I found 51 just by typing in 22RE idle. Search results Anyway two things.
1.
Your idle is set to high. The 22RE computer has a mapping in it that cuts alot of things down or off when the brakes are applied. Try warming up you truck to normal operating temp, then step on the brakes. Idle will go up and down, in a cycle. Adjust the idle set screw down a little, step on the brakes. If it stops cycleing you got it, if not turn the idle down a little more until it stops cycling.

2.
You have a vacum leak, you might not see it but it is there. Try taking some carb cleaner or brake cleaner, and spraying it around each vacum hose and fitting 1 at a time. If the idle goes up when you spray the hose/ fitting that is your leak.

Before you play with the idle, make sure you scrub and clean the TB out really well. Spray/Clean all of the ports, especialy the idle port chamber. Then go adjusting it.
Let me know if you need more info.
Brad

 

I replaced my brake master cylinder for about $80, a remanufactured life-time warrantee from Checker, but the NEW ones cost like $200...

Although this is probably not your problem, if you replace it any time I would recommend this route.