Just finshed my new motor. Put in edelbrock rpm performer heads and zz4 cam in my 87 350 tpi. My idle hunts up and down. Timing set at 6 btdc. any help needed. thanks



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1987 Camaro Iroc-Z Z-28 with a TPI 5.7
-Ram Air,K&N Filterchargers, Gutted Mass
Airflow Sensor, Throttle Body Airfoil,
Edelbrock TES Headers and Y pipe, Gutted
Cat, 3 inch exhaust, Flowmaster
-Hypertech Thermomaster Chip, 160 deg Stat,
Adjustable Fuel Pressure Regulator
set at 50 psi, MSD Cap, MSD 8.5mm wires,
Accel Coil, MSD 6AL Ignition Box, Accel
Plugs
-Richmond 3.73 Gears, B&M Transpak,
B&M Rachet Shifter, Energy Suspension
Products
-Fiberglass Cowl Induction Hood,
Purple Neon License Plate Frame,
16X8 Rims with BFG 245 50's,
Pioneer Deck, 2 JL 12's in a Q-Logic
Box with a 300 Watt amp

What you can put between your ears,
no one can take away.

 

You need a custom prom. Those "off-the-shelf" do squat.

 

could be your iac too (small 4 wire plug at bottom of throttle body on pass side)i really dont know just guessing but i know it controls your idle so maybe.
http://people.ne.mediaone.net/gdm/
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87 z28 bowtie aluminum 420small block dry sump crower lt. wt. knife edged crank oliver lt wt rods brodix track 1's super ram intake slp 1 3/4 headers accel dfi art carr 700 r4 3.42 gears ssm sub frame/ladder bars.....other parts on the way ,soon to be finished!! couple more weeks!!!

[This message has been edited by 87tpi420 (edited July 20, 2001).]

 

if you didnt reset the base idle speed that may be affecting this as well.

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'87 Monte Carlo SS,with '89 IROC 350,700 trans, blew up 3.73 posi stuck with crappy 2.73's neeed gears! hooker headers, flowmaster 2 1/2" exhaust true dualls, recently installed a set of alum vette heads 58cc, new cam for a paxton, recently installed paxton, OMG need a posi bad. So if anyone knows where a buick GN 8.5" rear is let me know.

 

you need a custom prom to raise your desired idle to around 725~750 RPM and will probably need to reset your minimum air for the IAB. I have the ZZ4 cam with the 6085 performer heads, along with the other stuff in my sig, and my car idles fine. Could it be better? I dunno but it idles with no problems, it doesn't hunt or surge. The only driveability problem I have is that when I am decelerating or apply a very light (very) throttle, at around 40 mph, the car surges and goes between 1000 and 1100 RPM---it feels like the convertor is locking and unlocking, but I think it is because I haven't reset my minimum air yet and it's having difficulty maintaining the RPM.

I am using a custom PROM I burned myself based off the 89 corvette code that has heads similar to the edelbrocks. The PROM is pretty much stock for now except for the desired idle RPM and fan turn on temps. It runs really strong.


James

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1985 Z-28 350 TPI, edelbrock 6085 heads, ZZ4 cam, accel base/runners & 24 lb/hr inj., ported plenum, everything gasket matched, crane AFPR, SLP 1 5/8 headers, single 3" flowmaster catback, 3" Hi-flo cat, modified tranny,
165 ECM, edelbrock STB,Spohn SFC, GW "wonderbar"

[This message has been edited by james_fearn (edited July 20, 2001).]