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Posted by 1FAST89GT (Member # 5071) on :
 
just put on gt-40 heads 1.7rr edelbrock intake 65mm t/b car is surging really bad any ideas
 
Posted by 88DroptopGT (Member # 2535) on :
 
How are the vacuum lines going to the new intake? Was there a provision for the PCV valve already?

Did you try to raise the idle with the tb screw and see if that made a difference?

Cold start only? What about when its warmed up?
 
Posted by 1FAST89GT (Member # 5071) on :
 
quote:
Originally posted by 88DroptopGT:
How are the vacuum lines going to the new intake? Was there a provision for the PCV valve already?

Did you try to raise the idle with the tb screw and see if that made a difference?

Cold start only? What about when its warmed up?
all the vacuum lines ae hooked up correctly
 
Posted by rickm347 (Member # 5323) on :
 
did you get the TB used or new?? if used, did it come with the TPS already on it?? if so, swap it for your old one.

*it sound more like you have a vacuum problem. your car might be calibrating for a certain amount of air/fuel, but getting more air somewhere else from a vacuum leak. I had this same problem. post more symptoms and updates --rick
 
Posted by 1FAST89GT (Member # 5071) on :
 
i fixed the surging and now it has a real rough idle
 
Posted by rickm347 (Member # 5323) on :
 
what cam do you have?? when you were trying to fix the surging, did you mess with the idle screw?? what RPM is your car fluctuating between on the rough idle?? --rick
 
Posted by BlueLightning302 (Member # 3974) on :
 
this guy doesnt answer enough questions thrown at him to get the problem narrowed down better.
 
Posted by 1FAST89GT (Member # 5071) on :
 
quote:
Originally posted by rickm347:
what cam do you have?? when you were trying to fix the surging, did you mess with the idle screw?? what RPM is your car fluctuating between on the rough idle?? --rick
stock cam, did not touch the idle, found a vacuum leak and repaired it, rough idle below 1000
 
Posted by court (Member # 6700) on :
 
how does the compression look?
 
Posted by 1FAST89GT (Member # 5071) on :
 
quote:
Originally posted by court:
how does the compression look?
great across the board
 
Posted by 1FAST89GT (Member # 5071) on :
 
quote:
Originally posted by rickm347:
did you get the TB used or new?? if used, did it come with the TPS already on it?? if so, swap it for your old one.

--rick
got the t/b used and had to put all accessories on it.
 
Posted by court (Member # 6700) on :
 
what plugs you running and what gap?

When you say the compression is great across the board what do you mean?

What are the compression readings in psi, cold all plugs out?
 
Posted by rickm347 (Member # 5323) on :
 
do you happen to have an adjustable fuel pressure regulator on the car??
 
Posted by rickm347 (Member # 5323) on :
 
quote:
Originally posted by 1FAST89GT:
quote:
Originally posted by rickm347:
what cam do you have?? when you were trying to fix the surging, did you mess with the idle screw?? what RPM is your car fluctuating between on the rough idle?? --rick
stock cam, did not touch the idle, found a vacuum leak and repaired it, rough idle below 1000
sorry so many questions, but when its below 1000 rpm, does it still fluctuate rpms??
 
Posted by 1FAST89GT (Member # 5071) on :
 
yah likes its missing or lopy
 
Posted by 1FAST89GT (Member # 5071) on :
 
quote:
Originally posted by rickm347:
do you happen to have an adjustable fuel pressure regulator on the car??
stock regulator at the moment
 
Posted by court (Member # 6700) on :
 
clean out the MAF with appropriate cleaner
 
Posted by rickm347 (Member # 5323) on :
 
how did you fix the surging?
 
Posted by 1FAST89GT (Member # 5071) on :
 
quote:
Originally posted by rickm347:
how did you fix the surging?
found a vacuum leak
 
Posted by rickm347 (Member # 5323) on :
 
wheres your timing at?
 
Posted by 1FAST89GT (Member # 5071) on :
 
10 btdc
 
Posted by rickm347 (Member # 5323) on :
 
was the car perfectly fine before the install??
 
Posted by 1FAST89GT (Member # 5071) on :
 
quote:
Originally posted by rickm347:
was the car perfectly fine before the install??
car ran great, installed these gt-40 heads and they smoked but the car still ran gret, took them back off sent them to the machine shop and had them worked over and now the only thing different is when i put everything back on i added a 65mm throttle body
 
Posted by rickm347 (Member # 5323) on :
 
what happens when you adjust the idle screw so that the idle is at 800?? if you havent tried that yet, do that and lmk what happens --rick
 
Posted by 1FAST89GT (Member # 5071) on :
 
just took it for a good ride and the brake pedal feels like a rock intermitantly, vacuum leak somewhere else
 
Posted by rickm347 (Member # 5323) on :
 
pcv valve for sure on the brake problem. i swapped injectors, throttle body and mass air and after i did that i didnt push the pcv in the back of the lower manifold all the way. when i drove down the street my brakes felt the same as yours. try the pcv valve. youre a smog tech, so you know how to check to see if the pcv is bad right?? when you shake it and it doesnt make any noise, its bad or clogged. if it rattles, then its good --rick
 
Posted by 1FAST89GT (Member # 5071) on :
 
quote:
Originally posted by rickm347:
pcv valve for sure on the brake problem. i swapped injectors, throttle body and mass air and after i did that i didnt push the pcv in the back of the lower manifold all the way. when i drove down the street my brakes felt the same as yours. try the pcv valve. youre a smog tech, so you know how to check to see if the pcv is bad right?? when you shake it and it doesnt make any noise, its bad or clogged. if it rattles, then its good --rick
yup intake gskt leak and pcv no good, thanx for all the help
 
Posted by rickm347 (Member # 5323) on :
 
[Big Grin] SICC!!!
 




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