Windsor stroked to 408 WONT IDLE fml

3 posts 3 contributors 1,729 views

Member since Sep 2011
1 post
Houston, TX, USA

Sep 23, 2011 at 10:28 PM

i have a1990 ford F250 5.8L windsor motor that was bored and stroked to 408. Still running stock intake and heads, 61 mm BBK throttle body, Converted to mass air, replaced stock injectors using 24# now.

I have 339 ftlbs of torque but only 177 hp. When I start the engine it revs high then settles down then runs rough, stalls and dies. It seems after its driven for a while it will stay running when stopped at lights. although sometimes it will stall out.

Anyone have any comments or suggestions.
This is really turning into a nightmare. thanks in advance.

jwar1127

Member since May 2009
47 posts
lauderhill, FL, USA
1 vehicle in the registry

Sep 24, 2011 at 2:47 AM

check your iac (idle air control) and for vacuum leaks.

jdmeaux

Member since Jan 2009
525 posts
Lafayette, LA, USA
1 vehicle in the registry

Sep 24, 2011 at 9:32 AM

Definitely check the IAC. And vacuum leaks.

With a 5.8L, I would go to a 70mm TB.

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It's just a SUPER-DUTY Mustang GT Sedan. 198K miles and still rolling HARD.

1997 Crown Victoria P71 SVT *** ex-US Marshall service (the CAR)
STOCK?? I bet it was modified.

13.26 @ 107.24 MPH 1/4 mi w/ me, tools, & full tank of 93 octane

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.PLANS:: engine upgrade, 5.4L 2v stroker, rebuild interior in leather w/ buckets, thinking about turbos

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