paging:ALL SPEED DENSITY GURUS, E303=surging idle

[slow87GT]

i've played w.idle adj. plate and screw on tb, tps, egr hooked,unhooked(though not func.)
guy at speed shop said pull chip out, I did it helped alot
this whole time idle being the only prob, at 1100, at 1700, or surging from 1000-1800. car drives good, bucks like typical E303 below 2000 on decel(ie. 4gear,30mph,3.73), somehow pulls hard to 6000, falls off a lil but pulls pretty good to 6500

it almost seems as if its retarded, but I've been running a stock cam for the last 2 years(in THIS car)so...

is this as worse as it gets(ie. get x303w/1.7's or bigger and live w/surge?)

oh yeah, its E303 w/1.7's straight up, heavily ported,milled 289 heads, longtubes 1 5/8, 3"exhaust, performer intake-ported up,lowercleaned up, 70mmtb,elect fan, etc.etc.

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ram air
70mm tb
ported performer
ported 289heads 1.94,1.6
1 5/8 LT's

[Unit 5302]

What's your fuel pressure set at? Have you played with that at all?

[slow87GT]

yeah, everything from 36-50

it runs best at 50

[Dangerous Dave]

Your speed density system runs itself gauged by the vaccuum in the motor. When you put the e-303 in you dropped the vaccuum and the computer is speaking english but trying to read Chinese-has no idea what to do so it just decides to run crappy. The only way I've seen to correctly cure this is to go to a dyno and get a chip burnt for your car. At WOT their is no vaccuum no matter what cam you run so that is why it works fine then-it's set up to run that way.

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1988 GT-under construction

[Unit 5302]

I'd try to get a hold of 88workcar, he's running an E-303 with SD. He had a bunch of problems with his idle, but he recently got it working.

He may know the secret.

Hehe, I swear that guy must get more SD questions! I think we need a forum called 88workcar's Speed Density Workshop!

[Mach 1]

I have experienced surging idle problems with the e303 cam and mass air. Some have problems with this cam, some dont. One of the great mysteries of the world. Anyhow, the e-303 is probably the worst cam u could have picked for a speed density car. It has a 110 LSA, not computer friendly, especially speed density.
The only way I solved my surging idle problem was to swap the cam (remember, this was a mass air car, and i tried EVERYTHING else), so maybe you will have better luck. By the way, i sold the cam to my friend, he put it in a mass air car, and it runs great, go figure?

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1993 GT/AOD
'93 Mustang GT

[slow87GT]

yeah, I want to get hold of 88workcar

I think the valves are too tight, its actually livable, but I think I can get it perfect, looking for suggestions, I know Jason(88workcar) have been up and down this road.

part gets me is part throttle drivability is fine, just idle $hitty

[slow87GT]

ok ok

reset lash

idles steady 1050(no surge) w/out chip

1100-1400(but not 1700 before) w/chip

I'll see if the computer can relearn the chip or I'll sell it for $ for fuel pump