Biochem

My electric choke was just replaced a few months ago and it works good... maybe too good. The car idles fine at startup, but after a few blocks down the road it doesn't run well at all until the engine is operating temps. I am curious if my e-choke is opening too fast or if that is even a problem. Is there a way to adjust it so it opens slower?

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1984 z28 w/ a 357 cu in. monster engine which is looking like the posterchild for Edelbrock... all the suspension stuff... 9-bolt posi disk is in... K&N filter... 93 octane...

-=ICON Motorsports=-

five7kid

iTrader: (14)

Try rotating it to a richer setting. The initial opening at startup will be determined by your choke pull-off, which sounds like it's fine now. Rotating will keep the tension higher until the thermostat warms up more.

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82 Berlinetta, orig V-6 car. Rescued w/86 LG4/TH700R with all harnesses, sensors, ECM, etc. 3.08 open, cat-back from '91 GTA, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LB9 w/ZZ3 cam, World 305 heads, exhaust, paint, etc.).
57 Bel Air, my 1st car. Currently 396 .030 over, Weiand Action+, Edelbrock 1901 Q-Jet, Jacobs Omnipack, 1-3/4" headers, TH400 w/TCI Sat Night Special conv & shift kit, 3.08 10-bolt, AMSOIL syn lubes bumper-to-bumper. Best 15.1 @ 5800' Bandimere. Daily driver while Camaro was being put together.

novadude

AFAIK, you cannot rotate OEM electric chokes. They are indexed to the housing. No reason you cannot take a dremel & grind off the indexing tab though. IMO, it shouldn't be necessary to mess with that.

MRZ28HO

novadude, I believe that five7kid meant the choke housing cover (the black thing ) Actually the housings came riveted from RPD once the choke was "universaly" set. What needs to be done (if not already) is drill out the rivets and install some screws in place (can't remember threads, I think 2-56?). You can rotate the cover which holds the choke "spring" (temp sensative coil) so it closes more or less depending on your climatic location.

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George P. Lara
1994 Z28 LT1 T56
1984 Z28 High Output
Member: SCCA, SCFB, SC3GFB

Damon

That's all good suggestions to try FIRST. One other way to go that I have played with (never got it quite right cause I didn't have the time) was to install a resistor in the line supplying voltage to the choke element. That means the choke won't try to close any further than normal for any given temp but the electrical "heater" will take longer to warm it up. I con't remember the resistance I tried but it wasn't many Ohms.


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94 Firebird Formula M6- No options but Z rated tires. No mods over $10. 13.5@105.
79 Malibu "beater" w/junkyard 400 SBC, tweaked QJet 4bbl, finally a decent set of heads, a few other tricks. A maddening 13.000001 @ 108 on the motor with little traction. No nitrous runs with the new heads yet.

"One of the last remaining QJet tuners on Planet Earth!"