Home
What's new
Latest activity
Authors
Store
Latest reviews
Search products
Forums
New posts
Search forums
What's new
New posts
New listings
New products
New profile posts
Latest activity
Members
Current visitors
New profile posts
Search profile posts
Log in
Register
Cart
Cart
Loading…
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Search titles only
By:
Menu
Log in
Register
Navigation
Install the app
Install
More options
Change style
Contact us
Close Menu
Forums
Mustang Forums
Fox Body Mustangs
89gt
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="FISHTAIL" data-source="post: 14503739" data-attributes="member: 19212"><p>Nice car. Shouldn't need a tune, though one always helps. Power, even with a 347 is being hampered by the heads. Ditch the GT40's immediately and get something better (Trick flow or AFR would be my first two choices). The idle issues could be many things. IAC sticking, crappy MAF, crappy MAF position, vacuum leaks, etc.</p><p></p><p>The backfire after letting off sounds like the car could be loading up..which also could have varying causes, but one that springs to mind as related to a crap idle is the MAF. It could cause both of those issues. </p><p></p><p>Top priority should be to know where everything is set. Make sure your fuel pressure is at 39-40psi (engine on, vacuum off the regulator), check your timing (12-14 btdc is generally where these cars like to be, 10deg is stock), check the overall condition of the plugs/wires/cap/rotor. Make sure it doesn't have any vacuum leaks, etc.</p></blockquote><p></p>
[QUOTE="FISHTAIL, post: 14503739, member: 19212"] Nice car. Shouldn't need a tune, though one always helps. Power, even with a 347 is being hampered by the heads. Ditch the GT40's immediately and get something better (Trick flow or AFR would be my first two choices). The idle issues could be many things. IAC sticking, crappy MAF, crappy MAF position, vacuum leaks, etc. The backfire after letting off sounds like the car could be loading up..which also could have varying causes, but one that springs to mind as related to a crap idle is the MAF. It could cause both of those issues. Top priority should be to know where everything is set. Make sure your fuel pressure is at 39-40psi (engine on, vacuum off the regulator), check your timing (12-14 btdc is generally where these cars like to be, 10deg is stock), check the overall condition of the plugs/wires/cap/rotor. Make sure it doesn't have any vacuum leaks, etc. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Mustang Forums
Fox Body Mustangs
89gt
Top