I just swapped on an Edelbrock base intake and runners with a portmached plenum onto my 1990 350 TPI along with 1.6 rr...when I first started the car I had an idle of 3000 RPM! WTF?! My timing is set correctly at 0*. I also got a code 33 which means a bad MAP, but it worked fine before. I think I may have a vaccum leak somewhere which would cause the MAP to read 0 vaccum.

My throttle blades are closed, meaning that my IAC is doing this. Could using 85-89 runners and base cause this problem (Vaccum)with the extra EGR passage built into the driver side runner.

Is my IAC vaccum controlled? If so...how? and why would I Idle at 3000?

Where does my EGR electrical connector connect? and what other hose besides the PCV hose and the coolant hose meets the pass. side of the throttle body?

Please help me, I have been downn for a month with this swap and I cant stand it any more!

 

Its a vacum leak

take a water bottle, and spray (mist) around the manifold, when you find the leak the car will stumble, or the idle will drop

Then fix it

good luck!

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1985 IROC-Z
TPI 305, 700R4 with shift kit, richmond 3.73's, auburn pro series posi, crane compucam 2030, ported plenum, gutted air boxes, all the little insignificant stuff.

 

Thanks 85, I thought it might be a vaccum leak. After I made this post I thought about the 9th injector passage and remembered that I forgot to block it off. I will remedy this by sealing the hole and hopefully my car will idle fine.

Any other suggetions?

Kyle

 

oh yeah...here's my profile

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1990 Firebird Formula 350 speed density TPI; Edelbrock HI-FLO base and Runners w/portmached plenum; air foil; Comp Cams 1.6rr; Edelbrock 1&5/8" headers; MSD 6AL, HEI coil & plug wires; underdrive pullies; Hypertech stage II chip; AFPR; B&M stage II shift kit; 3.73:1 rear; Jamex 1.5" lowering coils; Spohn subframe connectors, LCA's, and LCA relocation brackets; free mods; !cats; !AIR

 

Hahaha

That will do it


I need to do the same, damn that 9th injector

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1985 IROC-Z
TPI 305, 700R4 with shift kit, richmond 3.73's, auburn pro series posi, crane compucam 2030, ported plenum, gutted air boxes, all the little insignificant stuff.