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Author
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Topic: surging
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1FAST89GT
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Member # 5071
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posted
 
 
just put on gt-40 heads 1.7rr edelbrock intake 65mm t/b car is surging really bad any ideas
Posts: 4915 | From: VALLEJO | Registered: May 2004
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88DroptopGT
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Member # 2535
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posted
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?
Posts: 3978 | From: 707 | Registered: Mar 2003
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1FAST89GT
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Member # 5071
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posted
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
Posts: 4915 | From: VALLEJO | Registered: May 2004
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rickm347
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Member # 5323
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posted
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
Posts: 936 | From: Chico | Registered: Feb 2005
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1FAST89GT
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Member # 5071
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posted
i fixed the surging and now it has a real rough idle
Posts: 4915 | From: VALLEJO | Registered: May 2004
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rickm347
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Member # 5323
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posted
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
Posts: 936 | From: Chico | Registered: Feb 2005
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BlueLightning302
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Member # 3974
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posted
this guy doesnt answer enough questions thrown at him to get the problem narrowed down better.
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Originally Member #935
2003 Mustang Cobra - Some mods
"Well, atleast the slow one's trying!!" - Al Bundy
Posts: 207 | From: San Jose | Registered: Jan 2004
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1FAST89GT
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Member # 5071
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posted
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
Posts: 4915 | From: VALLEJO | Registered: May 2004
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turbo50
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Member # 6700
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posted
how does the compression look?
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.........when was the last time YOU built something with YOUR own hands?
I offer quality sidework at reasonable prices. PM ME
Posts: 7606 | From: Discovery Bay, California | Registered: Apr 2006
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1FAST89GT
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Member # 5071
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posted
quote:
Originally posted by court:
how does the compression look?
great across the board
Posts: 4915 | From: VALLEJO | Registered: May 2004
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1FAST89GT
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Member # 5071
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posted
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.
Posts: 4915 | From: VALLEJO | Registered: May 2004
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turbo50
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Member # 6700
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posted
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?
--------------------
.........when was the last time YOU built something with YOUR own hands?
I offer quality sidework at reasonable prices. PM ME
Posts: 7606 | From: Discovery Bay, California | Registered: Apr 2006
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rickm347
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Member # 5323
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posted
do you happen to have an adjustable fuel pressure regulator on the car??
Posts: 936 | From: Chico | Registered: Feb 2005
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rickm347
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Member # 5323
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posted
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??
Posts: 936 | From: Chico | Registered: Feb 2005
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1FAST89GT
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Member # 5071
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posted
yah likes its missing or lopy
Posts: 4915 | From: VALLEJO | Registered: May 2004
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1FAST89GT
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Member # 5071
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posted
quote:
Originally posted by rickm347:
do you happen to have an adjustable fuel pressure regulator on the car??
stock regulator at the moment
Posts: 4915 | From: VALLEJO | Registered: May 2004
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turbo50
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Member # 6700
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posted
clean out the MAF with appropriate cleaner
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.........when was the last time YOU built something with YOUR own hands?
I offer quality sidework at reasonable prices. PM ME
Posts: 7606 | From: Discovery Bay, California | Registered: Apr 2006
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rickm347
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Member # 5323
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posted
how did you fix the surging?
Posts: 936 | From: Chico | Registered: Feb 2005
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1FAST89GT
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Member # 5071
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posted
quote:
Originally posted by rickm347:
how did you fix the surging?
found a vacuum leak
Posts: 4915 | From: VALLEJO | Registered: May 2004
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rickm347
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Member # 5323
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posted
wheres your timing at?
Posts: 936 | From: Chico | Registered: Feb 2005
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rickm347
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Member # 5323
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posted
was the car perfectly fine before the install??
Posts: 936 | From: Chico | Registered: Feb 2005
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1FAST89GT
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Member # 5071
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posted
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
Posts: 4915 | From: VALLEJO | Registered: May 2004
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rickm347
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Member # 5323
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posted
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
Posts: 936 | From: Chico | Registered: Feb 2005
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1FAST89GT
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Member # 5071
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posted
just took it for a good ride and the brake pedal feels like a rock intermitantly, vacuum leak somewhere else
Posts: 4915 | From: VALLEJO | Registered: May 2004
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