1986 diag port
Team Owner
Joined: Sep 2001
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From: Athens AL
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Re: 1986 diag port (okinawa86vette)
start at your digidash at the corner where it meets the stereo receiver, follow the carpetting STRAIGHT down from the dash and youll see a little black honeycomb looking port, thats the ALDL connector.
Team Owner
Joined: Mar 2000
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From: Boston, MA
start at your digidash at the corner where it meets the stereo receiver, follow the carpetting STRAIGHT down from the dash and youll see a little black honeycomb looking port, thats the ALDL connector.
Thread Starter
Drifting
Joined: Jan 2002
Posts: 1,606
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From: Las Cruces NM
Re: (UfoPilot)
Cool thanks guys. I did a full ignition system tune up (plugs, wires, cap and rotor), put back on duals (flowmasters) since whoever had the car before swapped it out with a single pipe, what a sin, swapped in a K&N and now the code hasn't come back up. If it comes back up I will be down there getting the codes.
btw, going by the plug part numbers, my car, with the last digits of the vin being 12934, has aluminum heads. I was told by the guys at the Nat Vette Museum that the heads on my car would be iron. Oh well, guess I go a little lucky with the car.
That tuneup sure added a ton of power. The car is much, much better in every motor aspect. It starts quick, theres no hesitation at all and it is much much quicker. No more waiting for the motor to respond, it just rears back and takes off. Feels more like my 97 T/A now.
Chris
btw, going by the plug part numbers, my car, with the last digits of the vin being 12934, has aluminum heads. I was told by the guys at the Nat Vette Museum that the heads on my car would be iron. Oh well, guess I go a little lucky with the car.
That tuneup sure added a ton of power. The car is much, much better in every motor aspect. It starts quick, theres no hesitation at all and it is much much quicker. No more waiting for the motor to respond, it just rears back and takes off. Feels more like my 97 T/A now.
Chris
Team Owner
Joined: Sep 2001
Posts: 62,160
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From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Re: (okinawa86vette)
if your number is 12,934 you have cast iron heads, mine is #16,000 and i have iron heads, unless you have a vert anyway
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Thread Starter
Drifting
Joined: Jan 2002
Posts: 1,606
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From: Las Cruces NM
Re: (vader86)
I'm pretty sure that it has aluminum heads. The plugs are completely different. I had my father send a set of both plugs because I wasn't sure. Assuming my dad labelled the plugs correctly as to which were for the aluminum heads and which were cast iron, and I verified the plug numbers with the AC Delco web site, it has aluminum heads. The only thing not stock on the car were the rims, horrible centerlines, so I will be looking for new wheels, and the exhaust, so it doesn't look like the heads were swapped. The Japanese don't exactly know how to work on an American engine, let alone able to get parts for it.
I'l do the magnet check and the aluminum head cars have center bolt valve covers, right?
Chris
I'l do the magnet check and the aluminum head cars have center bolt valve covers, right?
Chris
Safety Car
Joined: Dec 2000
Posts: 3,767
Likes: 5
From: Jacksonville Fl
Re: (okinawa86vette)
All you have to do is LOOK to see if they are aluminum or cast. It's pretty hard to mistake Aluminum heads for cast.
Don't go by the plugs., you could have the wrongs ones in it.
Don't go by the plugs., you could have the wrongs ones in it.
Thread Starter
Drifting
Joined: Jan 2002
Posts: 1,606
Likes: 1
From: Las Cruces NM
Re: (ADL)
I don't know whats up with this motor. The heads used the spark plugs that are listed or aluminum heads, but the bolts on the valve covers ar the old perimeter style. I haven't checked the codes, but I will look.
On a 17 year old car that hasn't had the maintenence and upkeep that it deserves, it is pretty hard to tell the difference. 17 years of grime and oil residue and everything else is on those heads. You guys don't realize how bad the Japanese are about car maintenance. That and being an American car, they don't know how to work on them and are scared to.
On a 17 year old car that hasn't had the maintenence and upkeep that it deserves, it is pretty hard to tell the difference. 17 years of grime and oil residue and everything else is on those heads. You guys don't realize how bad the Japanese are about car maintenance. That and being an American car, they don't know how to work on them and are scared to.
- 1986 Original Owner -
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From: North Yorkshire, England
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Re: (vader86)
if your number is 12,934 you have cast iron heads, mine is #16,000 and i have iron heads, unless you have a vert anyway
Burning Brakes
Joined: Dec 1999
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Re: 1986 diag port (okinawa86vette)
Its too bad you don't live closer to Yokohama. My uncle owns and runs Sato Motors up there, and he does some American car work. I could talk to him and help him along with any questions from this end. I do quite a few L98s and LT1 work at my shop here. Maybe I should move my shop over here:)
With the perimeter bolt valve covers, its a cast iron headed motor for sure. Unless someone has put in aftermarket (AFR, Edelbrock, etc) alum. heads on, but thats probably not likely. Good luck.
With the perimeter bolt valve covers, its a cast iron headed motor for sure. Unless someone has put in aftermarket (AFR, Edelbrock, etc) alum. heads on, but thats probably not likely. Good luck.
Thread Starter
Drifting
Joined: Jan 2002
Posts: 1,606
Likes: 1
From: Las Cruces NM
Re: 1986 diag port (lowflyer)
I am about 99 percent sure that my car has iron heads. I wonder why the aluminum head spark plugs were the ones I had to use. I had a set of both from AC Delco, one for the 86 with aluminum and one for the iron heads. The plugs that came out were a match with the aluminum heads. Thinking that maybe they had used the wrong plug last time they were changed, if they were changed, I tried the other ones and they wouldn't even thread into the head. Wierd.