Author Topic: C4 1987 Throttle Body Coolant Bypass  (Read 379 times)

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Offline Vettech

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C4 1987 Throttle Body Coolant Bypass
« on: July 31, 2020, 08:57:33 PM »
Well since I have half the engine ripped apart and a friend mentions bypassing the Throttle Body's (TB) Coolant and I'm locked down in Covid19 seclusion, the mind wanders into Google and Youtubes. After much reading, it is obvious that the heated TB is good for freezing conditions in the northern hemisphere, stops the TB & its butterfly valves icing up and freezing. Whilst I'm keen on skiing and have several sets of snow chains, I dont think there is any way known to man to get those chains around the rear tyres into the guards without causing major damage to the tubs. Why do I mention this, well, I dont really do mods for mods sake.
BUT !.
Since the 87 is apart, and I can clearly see the high levels of corrosion associated with the cooling system,  and I' m trying to get the water, heater and pipes/hoses back to a concise clean layout, and a hot TB is not really required, then its time for a mod, which should allow a better hose layout etc. My87 is a Mirror Conversion, thus heater is now on LH side, along with the Oil Cooler, which started this sorry saga originaly, whilst most of the original pipes/hoses, hot water valve have been junked by the converters. Today driving home In the 90, I was cold, turned on the heater - dialed up a nice level of toasty warm (I must be getting old), I was nearly talked out of repairing the 87's Heater Matrix, after today I'm glad I stuck to my guns and I'll be attacking the 87 with renewed gusto.

I'll have to get a camera that takes pics that can go onto this forum.
Regards.
Vettech.

Offline MY081

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Re: C4 1987 Throttle Body Coolant Bypass
« Reply #1 on: August 01, 2020, 04:58:06 PM »
Photo's on this  forum (never happen ) Say Christmas in July !!!! Or Sunday lunch to Jamberoo !!! Bondi Breakfast !! Just saying Ray

Offline Vettech

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Re: C4 1987 Throttle Body Coolant Bypass
« Reply #2 on: August 01, 2020, 06:47:13 PM »
Thanks Raymond!.

We did have issues like the file size, this was modified by PeterP and upped to 900kbit.

The issue I now have is my ipad went kaput - they raced off to buy me a new one (they must think I'll include them in my will - lol)

The new one (same brand etc etc) but the file size is even greater and it gives new file types, where we only accept  certain types.

Having said all that - I do remember you being at xmas in July, what pics did you take, where are they etc etc etc..... 

Well ?......
Vettech.

Offline Vettech

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Re: C4 1987 Throttle Body Coolant Bypass
« Reply #3 on: August 01, 2020, 06:51:38 PM »
Now back on track...... thanks for the call Sirfixalot.

But sitting here now, do I remember correctly, you saying reverse flow.

I thought the LT1 was reverse flow - BUT does that apply to the std L98 ?...

My apologies,  the below pic we had trouble with, and my daughters fingers are so quick it went in here, anyway it shows much mess and corrosion, note the IAC body, you cant see the Pintel for the black crud layer.
Vettech.

Offline MY081

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Re: C4 1987 Throttle Body Coolant Bypass
« Reply #4 on: August 02, 2020, 03:12:08 PM »
ME post photo's on any Forum would be a miracle !!! but wear have all the members gone  who used to post photo's here. It's not your responsibility or anybody else's to post photo's . Members used to do it just for fun !!!!!! Ray

Offline Vettech

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Re: C4 1987 Throttle Body Coolant Bypass
« Reply #5 on: August 02, 2020, 03:42:36 PM »
Time and Tide Raymond.

If you look down the bottom of the forum page you will see two (2) Users, and 59 guests.

Those 2 users are you and I. Whilst the 59 could be anyone from any place world wide.
And they could be just as easily 59 club members. Not all members come on board and even those who do may only ever look & read.
I'm surprised how many club members I talk to say "yes I read your post - it was good/bad/indifferent) but they never go as far as to comment directly onto the forum - whilst some do get involved and voice their opinions - they are the ones I like best, because they can throw another perspective on an issue.

And your not the only one with limited computer skills, I now, only ever type a sentence or two, because in the past I've typed up an A4 page of technical guff only for my thumb to hit the wrong something and I lose the lot, so I post a sentence then do a "modify" and thus build up the text.
Past issues with heated arguments are no longer an issue, but may have put people off.

I'm happy if I see those numbers like todays at 50 ~ 60 which means we have Corvette Interested people on line. The next time I see you I'll show you how to post up a pic - its not like the ole days with a photo bucket ??? Thingy, as long as your phone takes a pic with the correct acceptable format ie jpeg, etc and under 900kbit it should post up easily.

Regards. 

Vettech.

Offline Vettech

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Re: C4 1987 Throttle Body Coolant Bypass
« Reply #6 on: August 02, 2020, 04:13:54 PM »
NOW BACK ON SUBJECT.

Sirfixalot - I removed the TB, the manifold side is like the bottom of a coal mine, the water galleries are a mess, the vac ports are full of crap, the pintel on the IAC is an unrecognizable blob of black crud. I thinks the whole assembly is way past a service. Also the seven screws were all different, ones head came off, they are all a rusted mess.

Did you get gasket sets or ???  I'd imagine that place at Eastern Creek would have them, cant remember their name, but surely these are fitted to Holden vehicles. ? I took some pics (with phone) I'll try to post them. (Was Rocket Ind - nothing in Cat)
See! Who said the Pres was good for nuttin. I sent my pic, he returned in different format and smaller size.
Of course no one has been in this TB before, umm of the seven (7) IAC body screws, three were longer Phillips with a drilled out nut as a spacer,  three came out correct, whilst one had only the head left.
Vettech.

Offline sirfixalot

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Re: C4 1987 Throttle Body Coolant Bypass
« Reply #7 on: August 02, 2020, 07:25:34 PM »
Glen from Corvette Corner in Victoria has the complete gasket set. I didn't replace the bottom gasket as I am disconnecting water heating.Top gasket  under TPI was non existant so there was a potential vacuum leak, Idle control valve washer was non existent sealed with silicon. I bought main gasket from Ponti world same price Glen has complete gasket set.made a new top gasket & a fibre washer from repco 3/4 " hole. Discovered a new problem where the hose tail comes out of front of manifold it goes straight into a bracket for air pump valve have to source a half inch BSP  45 degree male / female elbow. Also need to source small spring clip which holds auto kick down cable onto throttle shaft

Offline Vettech

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Re: C4 1987 Throttle Body Coolant Bypass
« Reply #8 on: August 02, 2020, 07:59:11 PM »
Ask Bob, I know the ones you mean, I only removed them this arvo.
Else Phill in Vict or one of those walk around get you own wreckers.
Vettech.

Offline sirfixalot

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Re: C4 1987 Throttle Body Coolant Bypass
« Reply #9 on: August 03, 2020, 06:59:30 PM »
Your throttle body looks  worse than mine but you will be surprise what a scratch brush & some turps will do I have a couple of small round nylon pipe cleaner type brushes pushed in every where then flushed with hose.

Offline Vettech

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Re: C4 1987 Throttle Body Coolant Bypass
« Reply #10 on: August 03, 2020, 07:30:33 PM »
Ummm I'm thinking that on Wednesday I'm home alone, and the dishwasher is empty. Aha she has gone Tues .....

Well it came up a treat,  went to Konnect at W'pk got 7 x (M4 x 0.07) x20mm 316 S/S cap heads.
Decided to cut the complete water tails off flush. I wont run water thru it.
Ran  M4 tap down the hole threads to clean them out.
Now to get the broken screw out...... ummmm.
Vettech.

Offline Vettech

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Re: C4 1987 Throttle Body Coolant Bypass
« Reply #11 on: August 12, 2020, 05:05:25 PM »
Well no 0ne has the Gasket Set except Glenn at Corvette Corner . Vic. Ordered.

Fixed the IAC connector - pluged in, new battery, couple hrs of charging, power up and IAC runs the Pintel out of the port.
Turned off power and nothing - I thought these run the Pintel back into the port upon switch off..........any one ????
Vettech.