Kuzz

I replaced some of my vaccum lines and now it bogs down around 3600rpm. I replaced the pill in the vaccum line to the boost sensor but it still bogs down. what could it be

BlackRx7

what type of bog are we talking about 3800 rpms hesitation? or a bog where the rpms drop with your foot on the gas? It is more than likly is the TPS, you car will do some funny things if the TPS is outa Wack, detonate easily and bog like what your saying. Got mine changed and it was like I was drive a new car!

jacobcartmill

iTrader: (6)

everyone and their ******* brother has this problem with their 2nd gen.
your problem is probably happening at 3800 rpms. do this: accelerate slowly and see if you can get the car above 3800 rpms. if you can, and this boggin only occurs when you have a load on the engine (having the gas like halfway down while accelerating) then your secondary injectors are causing your bogging by not coming on when they are supposed to.
check it *****. do a search up in this piece

Kuzz

it bogs like it is rich the rpms keep going up just really slowly. it is only when it is wide open

jacobcartmill

iTrader: (6)

its the secondaries. they come online at 3800 rpms under load. if you can slowly raise the rpms above 3800, then its definitely the secondaries not firing.

Kuzz

then why would it be running rich if they dont come on

Kuzz

and why would it happen over night

jacobcartmill

iTrader: (6)

maybe i'm misunderstanding you... you're gonna have to explain this situation better to get an accurate diagnosis.
does the car run normal, except when at 3800 rpms under a load?

Kuzz

the car runs normal when crusing at any speed. I can floor it and it runs fine till 3600rpm. at 3600rpm it feels like hitting a wall and it sounds rich. when I shift it will back fire. all other times it runs fine like idle, crusing, slow acc.

jacobcartmill

iTrader: (6)

and btw, many strange things can happen in one night the these shitty 80's electronics and wiring.

jacobcartmill

iTrader: (6)

its the secondaries.
and its probably 3800 rpm, not 3600. my car has been doing this for months.


feel free to prove me wrong. after we get past this we can start trying to fix it.

Kuzz

no I have a s-afc and it hits at 3600 or slightly before

saltlakebay

Yup.. probably bumped a wire going to the injector. They get easy to bump off at our cars age. You describe the problem exactly. Read this and the threads linked on it:

http://www.teamfc3s.org/forum/showth...&threadid=8083

jacobcartmill

iTrader: (6)

after you figure out that its the infamous 3800rpm hesitation (do a search) add a ground wire to pin 2C on the ECU and add a ground wire from the boost sensor to one of the 2 bolts up by the water filler cap on the water pump housing elbow. a common fix...
there are some other things you can do, and a few more pins on the ecu that you can ground, but those 2 grounds i listed fixed alot of people's hesitation.

btw, i have an 87 t2 myself.

jacobcartmill

iTrader: (6)

regardless, the problem has something to do with the secondaries.

Kuzz

thanks for the help saltlakebay

thanks for the attitude jacobcarmill.

saltlakebay

Well, if this happens, i believe a wire has come off an injector.

1) if real light on the throttle, it'll go through the rpm range.
2) if in neutral and you hit it, it'll get up there, but it'll backfire on the way up.
3) if in medium/heavy on the throttle while moving, it just hits a brick wall at 3700 rpm's and stays there.

If its only at 3800 then goes away, its probably the infamous hesitation problem.

Kuzz

its not only at 3800

jacobcartmill

iTrader: (6)

what the hell dude?

i've been absolutely no help to you?
i try to help someone that has the same problem that i have had, and this is the response i get.
your problem sounds like exactly what my car has been doing...

i could have come in this thread and said, "**** newbies, do a search" but i tried to help. the problem sounds like 3800rpm hesitation and has the same symptoms. regardless of what rpm its at, it has something to do with your secondary injectors, which is what i said.
keep in mind that this infamous 3800 rpm hesitation may not occur at *exactly* 3800 rpms...

i hope you step in dog poop.

adamlewis

Holy crap man.



Cars arent that complicated.
Something electrical is messing up at 3600 rpm. Its either fuel, or spark ( Its unlikely its going to be air related since it does it all the time, everytime ). These cars arent all that complicated!


Take some peoples advice and check your injectors.
If youre not, then dont even bother posting.

Jake wasnt giving you attitude.

Kuzz

well maybe i interpreted it wrong. sorry and how do you know I am a newbie! I just post and hang out on a different bord cause they are nicer and more friendly. but I wanted to get as many opinions. sorry and to me if someone says the infamous 3800 rpm hesitation to me I think "3800rpm" that is why it is called that not the something rpm hesitation.

Kuzz

oh and I never said I wasnot going to scheck my injectors. I just want to gather as much info as I can so I can try everything at once until I fix the problem

BlackRx7

Yeah the point is no one can diagonse a car over the internet, even if a detialed description is included......but serioulsy check all sensors, reset the idle, timing and, TPS....