need help with stalling and idle surging...tries a bunch of tests

K

Killer5.0

Well-Known Member
#1
#1
okay so i took it to my mechanic and he tested the TPS, AIC, ran the codes ...everything came back good...he had one code that was for a "flapper" on the stock airbox control i guess but said that since i have an aftermarket its not there and shouldnt affect it...he tuned the idle up a little which helps but its not a permanent fix he said...here is my list of mods and where should i go next? do i need a custom chip?

BBK headers, h-pipe to borla dumps (b4 rear axle)
BBK 70mm Throttle Body
BBK 70mm MAF
BBK CAI (fendermount)
3:73 gears
F303 cam
GT40 Upper and lower intake manifold
BBK FP regulator (at 38lbs at idle)
19lb injectors
200a alternator

thanks


 
F

Fast5LiterGt

Well-Known Member
#2
#2
Does it stall at idle? How open is the butterfly in the TB when it is idling? And how old is the IAC? Over time there is a buildup of carbon inside that can be cleaned out with some throttle body cleaner and a rag.

Did you check all lines to see if you possibly have a vaccum leak someplace?
 
vorstang

vorstang

Well-Known Member
#3
#3
sounds like the IAC to me but it can also be the way your setting your idle. you just don't turn the idle speed screw, there's more to it
 
K

Killer5.0

Well-Known Member
#5
#5
well he tuned the idle and a set screw on the TB i think and it doesn't stall anymore and idles at around 800rpm so im happy with it...so far so good...thanks for all the input...(btw i did clean the IAC last week and it did help some) thanks again
 
KazenNYC

KazenNYC

Active Member
#7
#7
I had the same issue it was a vaccum leak 2 mechanics later and my brother finally looked at it, listend to it and put his finger over the hole in a line under the upper intake and it ran perfect after that. it was a 2 dollar hose
 
KazenNYC

KazenNYC

Active Member
#9
#9
"I dont know if you have checked for vaccum leaks but My 89 was doing the same thing for the longest time and I found a vaccum leak in one of the lines under the upper intake I was suprised because I couldnt hear it because the car is pretty loud but I was feeling around and touched the rubber hose and it stopped surging. also the gasket for my EGR valve was no good so after changing all that stuff it runs great. "

thats the same issue i had in the link he just posted
 
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