I just installed a new motor on my 91 Z28.I have a BBK 52mm TB.After switching every off the the old TB do I need to reset my TPS.Cause it does not seem to want to idle.My new motor is rather x-treme compared to original 305cu.I'm sure the stock chip isn't helping matters none plan on custom programming myself.But thought this would as good a place to start as any.Heres some spece on my motor
355cu 10.23:1cr AFR 190 heads
Mini Ram int
comp xtreme energy cam
.535 int .543ex 218/224
112LSA
SVO 24#inj
headers,no cats,3in exh,flowmaster

YES, reset the TPS voltage. Put it between .5 and .6 volts. Wait, nevermind. You have a 91 model so the TPS is of the nonadjustable type. You don't have to reset it. Unless you replaced the original with an adjustable model.
bsa

Check to make sure the throttle shaft screw (phillips head screw on passenger side) isn't contacting the TP sensor arm. I ran into that with the same BBK TB on my 87 Formula 350. I took a dremel with a sanding roll and ground down a few millimeters of the screw head. It stopped my idle (and trouble code) problems. If that doesn't do it, check for intake leaks at the TB. Good luck with it.

Have you reset the IAC? That is key in maintaining an idle and should probably be reset.

chiefz28,

What cam part number is that?...Sounds like what I am looking for..

Thanks

no I haven't set the IAC once again I read the tech article but it isn't real clear to me.could you make it a little more idot proof for me I would greatly appreciat it



[This message has been edited by chiefz28 (edited July 12, 2001).]

the part # is 08-503-8.I'm sorry those spec are a bit misleading that is what I ended up with using 1.6 rockers in replace of 1.5.the actaul specs are .503int .510exh

If it's a new throttle body, have you tried setting the minimum air?

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1989 IROC-Z 5.7L
NOS 150HP kit
ProBuilt 700R4, PI Vigilante 2800 stall lockup
Baer Brakes 12" Sport System

I haven't set any thing yet I'm trying to finid out as much as I ca n before I go adjusting things.Is that the same a the IAC or no I remembwer hearing this before but I've been reading so much stuff this past 2 wks things are all starting to sound the same.