My car idles like crap right now and I've replaced basically everything I can think of. Anyway what would be some symptoms of a bad ESC module and where would I find it on a 1991 Z28? My car does not idle without constant fluctuations.

 

Anybody?

 

Is it possible the almighty techs here at thirdgen have been stumped?

Anyway I cant get the car to idle without a constant dropoff and it runs REAL rich. Well I think its running rich, My exhaust smells like so bad it makes you pass out from one wiff Would the ESC cause this?

I've checked the wires *MSD SUPER CONDUCTORS* I've changed the plugs three times from bosch x4, Standard ACplugs, and now I have the AC rapidfire's. I put a new cap and rotor. I tested the MSD box and it worked fine. I replaced the coil to a 8223 MSD 3. My fuel pressure is 44psi. I've replaced the ignition module and just about everything else I can think of. For some reason the car will not idle at any constant rate, it keeps dropping and picking WAY up. Thanks please help.

[This message has been edited by MATEOZ28 (edited March 20, 2001).]

 

I've read some Post that the ESC is all in the ecm on a 91 Z "sd" computer and you dont really have a ESC all controled by ecm

hope that helps

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Hecubus
http://www.tweak3d.net/temp/z28.jpg
91-Z28 305 Tpi "G92" mods-- K$N/Foil/B&M shifter/ Intrax Springs/ Kyb Shock's-Struts's/Poly Bushings/Hotchkis Strut Tower Brace/ 100-150 Nos Wet Plate System/ 155lph Fuel Pump/ Holly Adj. Fuel Press. Regulator/Digital Fuel & Oil Press Guage's

 

I'm getting ready to post about my ESC module. My car idled fine, but when I go over 3K rpm it starts missing out and back firing. Don't know about it affecting idle though.

Doesn't help any but just stating the condition I got with mine acting up.

Sparks a flyin'

 

What else could the problem be?

 

Injector's maby??
Have you check them?
Mine did close to that when I had one go bad
Fuel wouldnt Spray and it just was dumping
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Hecubus
http://www.tweak3d.net/temp/z28.jpg
91-Z28 305 Tpi "G92" mods-- K$N/Foil/B&M shifter/ Intrax Springs/ Kyb Shock's-Struts's/Poly Bushings/Hotchkis Strut Tower Brace/ 100-150 Nos Wet Plate System/ 155lph Fuel Pump/ Holly Adj. Fuel Press. Regulator/Digital Fuel & Oil Press Guage's

[This message has been edited by Hecubus (edited March 20, 2001).]

 

How do I check them? I put new 24lb injectors in a few months ago. Well not brand new but they had 22K miles on them from a 97WS6

 

Does your fuel pressure stay up when the pump stops without the engine running? When you cycle the ignition switch on, it should build pressure, then kick off after 2 seconds. After that, it should maintain the pressure for a few minutes. If it is dropping, from the symptom's you've given, I'd say you have an injector leaking.

Good luck!

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Working on:
'84 Z28 LG4 305 with 200,000 original miles!
Added dual elec fans.
145 MPH IROC Speedo
Building 430 HP 350 (ZZ430)
using primarily GMPP parts.
Short block sitting on a stand.

Starting to look like the Kicker poster child!

ASE Certified Master Tech

 

Nope the fuel pressure stays constant. I'm glad my injectors arent bad. I think its just a tuning problem. its a slight misfire and a bad fluctuation in idle.

 

I think you need to find someone in the bay area who does custom proms, and get them to tune your car. A 383 with 24lb injectors and cam/heads isnt going to run very well on the stock chip.

Do you think you'll have it together in time for the GM West Coast Shootout??

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West Coast GM Shootout 2001!
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

Well kevin, I do have a chip, I have several actually ranging from race, street, mileage, and one to help pass smog. I have the street chip in the car now. I'm going to make the shootout even if I have to bring my 95Z but it only runs mid 13's and I'l anxious to see what my 91 will run weighing in at 3800 lbs because of stereo equipment. I'de be willing to bet it runs a low 14 the way it's acting now though

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TTT