05-03-2008 | #11 |
Join Date: Dec 2004
Location: Jacksonville, FL USA
Posts: 4,645
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Re: High idle after running.. Some questions
This is just a fwiw from the peanut gallery.
we have sooo many vac connections that it's a nightmare. I bought new 90 els from the I/H's, new F connector @ PCV tops, and new reg hose & MAP hose. The double connector @ the lower left TB was loose too. I replaced what I could buy, and zip tied the TB double connector. I also did the update on the PROM from GM....net result was great for about two & a half yrs.....now the GM F connector is loose as chit again & the idle is starting to do a bit of up & down. After all my bs, my point is even with new rubber this stuff seems to go soft in a hurry & back to square one. How to keep the rubber from softening, and or how to revive the soft rubber are the keys to all these small additive vac leaks? I clean the oil out of the PCV system on a regular basis and still it's a loosing battle. JMHO, when people had turntables to play records......yea I'm that old!....the most common problem with all of them was a part called the Idler Wheel. A combo of rubber molded to a metal wheel. The common trick was to use iso-propyl alcohol as a reviving agent to firm up the soft rubber. We used to soak the wheels in the soloution for a day, and presto...firm rubber again. I'm gonna try it & see what happens on the old stuff, I saved all the BG/OEM parts as spares. Sorry to be sooo long about this!
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1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member |
05-03-2008 | #12 |
Join Date: Nov 2007
Location: Sunshine State
Posts: 1,071
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Re: High idle after running.. Some questions
I realize this may not wok for the PCV boots or other parts in the PCV system. (it might though) However, when I pulled my plenum, I noticed a few loose vacume connections where the rubber boots met with the hard plastic lines. I used black silicone as a sealer and it seemes to work pretty well. I let it sit for a long time while waiting for parts to fully cure. I havent had any issues "yet".
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[B]1990 #2815[/B] [COLOR="Red"][B]Red/Red[/B][/COLOR] Ported Plenum & IH (by Pete) Haibeck Chip Rebuilt FPR (by Phil) FIC Injectors Watson LT Headers 3" Stainless Works exhaust Lingenfelter Open Air Lid Bill B Built Transmission Shifter & C Beam Plates [FONT=Impact][COLOR=red]1992 [COLOR=black]#[/COLOR] 091[/COLOR][/FONT] [FONT=Impact][COLOR=#ff0000]Red/[COLOR=silver]Gray[/COLOR][/COLOR][/FONT] [B]SOLD[/B] |
05-03-2008 | #13 |
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,152
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Re: High idle after running.. Some questions
thanks for the tips guys.. I was thinking about it last night too.. specifically that 'F' connector for the PCV.. Since I know my 90 with NEVER be NCRS, I might find something else, at the local ACE, then use some old PCV hose from my 89 (if I still have some) and create something better. I know the PCV on my 89 would not get that loose, but there are many different factors between the 2 motors.
I also have the Latest MEMCAL Binary file to change as the PROM in the car was the older mask with the VERY high IAC count settings.. The Newer Mask will probably help too
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
05-03-2008 | #14 |
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,152
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Re: High idle after running.. Some questions
I Found that my PROM even though it was a 'Tuner' PROM, still used the early base BCC so I had a later BCC Bin file and changed the fan turn on and burned it to try.
Starts up at 1500 rpm and drops off quickly to around 800 I think.. hard to tell with the GM Accurate Tach
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
05-03-2008 | #15 |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,698
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Re: High idle after running.. Some questions
Jeff,
We should try putting a 92 stock bin on your chip and see how it works. |
05-03-2008 | #16 |
Join Date: Mar 2006
Location: Portsmouth, VA
Posts: 245
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Re: High idle after running.. Some questions
Did you guys ever get this sorted out?
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05-03-2008 | #17 | |
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,152
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Re: High idle after running.. Some questions
Quote:
I will drive it around the block tomorrow to verify..
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
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