L98/TPI plug wire routing.
Thread Starter
Le Mans Master
Joined: Oct 2002
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From: Las Vegas - Just stop perpetuating myths please.
L98/TPI plug wire routing.
Any one have a pictorial of the plug wire routing for a '89-'91 L98/TPI? Looking at a very low mileage car but the plug wire are routed above the exh manifolds along the base of the vlv cover. I dont think that can be stock and wonder why they moved them on a low mileage car when they should be good for at least a 100K mi..
Sorry for late weekend request but maybe some of you experts are still awake.
Sorry for late weekend request but maybe some of you experts are still awake.
Team Owner
Joined: Jul 2004
Posts: 28,475
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From: Hartford WI
Who says they are good to 100K? Not as a stock system but maybe if you shielded it.
Another reason is that someone might have thought that bigger is better so they got the fattest wire they could.
Another reason is that someone might have thought that bigger is better so they got the fattest wire they could.
Race Director
Joined: Aug 2000
Posts: 11,470
Likes: 764
Any one have a pictorial of the plug wire routing for a '89-'91 L98/TPI? Looking at a very low mileage car but the plug wire are routed above the exh manifolds along the base of the vlv cover. I dont think that can be stock and wonder why they moved them on a low mileage car when they should be good for at least a 100K mi..
Sorry for late weekend request but maybe some of you experts are still awake.
Sorry for late weekend request but maybe some of you experts are still awake.
pic #3 is from an original, 235 mile, 1990 car.
(pretty sure this is a challenge series L98 - not sure what year)
Last edited by Joe C; Sep 19, 2016 at 12:11 PM.
Thread Starter
Le Mans Master
Joined: Oct 2002
Posts: 7,098
Likes: 378
From: Las Vegas - Just stop perpetuating myths please.
Perfect Joe, that's just what I was looking for! Yea the wires are blue and ad says has modified exh so I think it's been tinkered with. But very low miles has me wondering what the owner was up to. I kinda think that should take from value of low mileage car - very low miles. Man would I like to do a compression test.
Thx again.
Thx again.
Team Owner
Joined: Jul 2004
Posts: 28,475
Likes: 3,291
From: Hartford WI
Perfect Joe, that's just what I was looking for! Yea the wires are blue and ad says has modified exh so I think it's been tinkered with. But very low miles has me wondering what the owner was up to. I kinda think that should take from value of low mileage car - very low miles. Man would I like to do a compression test.
Thx again.
Thx again.
Race Director
Joined: Aug 2000
Posts: 11,470
Likes: 764
Perfect Joe, that's just what I was looking for! Yea the wires are blue and ad says has modified exh so I think it's been tinkered with. But very low miles has me wondering what the owner was up to. I kinda think that should take from value of low mileage car - very low miles. Man would I like to do a compression test.
Thx again.
Thx again.
- a little FYI - original delco plug wires will be gray and stamped or ID'd with the corresponding cylinder number. delco replacement sets do not have the cylinder number markings.
Last edited by Joe C; Sep 19, 2016 at 03:19 PM.
Thread Starter
Le Mans Master
Joined: Oct 2002
Posts: 7,098
Likes: 378
From: Las Vegas - Just stop perpetuating myths please.
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Team Owner
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From: Hartford WI
Safety Car
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From: Mission Viejo CA
The wire for #1 does not go behind the distributor, if you've installed the distributor correctly. The tower for the #1 wire should be aligned toward the #1 cylinder.
If the dist. is correct, the plug wires for 1, 5, & 7 (odd numbers) will be on the LH side of the dist, and the plug wires for 4, 6, & 8 (even numbers) will be on the RH side of the dist. Only 2 & 3 need to cross over!
If the dist. is correct, the plug wires for 1, 5, & 7 (odd numbers) will be on the LH side of the dist, and the plug wires for 4, 6, & 8 (even numbers) will be on the RH side of the dist. Only 2 & 3 need to cross over!
Race Director
Joined: Aug 2000
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The wire for #1 does not go behind the distributor, if you've installed the distributor correctly. The tower for the #1 wire should be aligned toward the #1 cylinder.
If the dist. is correct, the plug wires for 1, 5, & 7 (odd numbers) will be on the LH side of the dist, and the plug wires for 4, 6, & 8 (even numbers) will be on the RH side of the dist. Only 2 & 3 need to cross over!
If the dist. is correct, the plug wires for 1, 5, & 7 (odd numbers) will be on the LH side of the dist, and the plug wires for 4, 6, & 8 (even numbers) will be on the RH side of the dist. Only 2 & 3 need to cross over!
if you look at any replacement set, ac delco or any other manufacture's replacement set, you'll see the #1 wire is always the longest wire in the set and usually around 44 inches long. I have personally installed 5 replacement sets on L98's (2 delco, and 3 taylor sets), and they have all been this way.
here's an old thread that addressed plug wire lengths for L98 cars -
https://www.corvetteforum.com/forums...e-lengths.html
Last edited by Joe C; Sep 20, 2016 at 07:51 PM.
Safety Car
Joined: Sep 2004
Posts: 3,953
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From: Mission Viejo CA
Sorry - have to disagree with you on this one. I've had three original L98 cars, and all three had the #1 plug wire route up and behind the distributor. All cars had the distributor installed correctly. I know it doesn't make sense, and not sure why the General did it that way, but that's the way it is.
Melting Slicks
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From: Mid-Atlantic
2025 C4 of the Year Finalist - Unmodified
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Necro bump...since these are darned fine photos...stumbled over the thread looking for exactly how many of whichever oem reproduction plug wire looms I need to acquire...which is all of em. At least I know what they look like now.
Pro
Joined: Jun 2018
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Any one have a pictorial of the plug wire routing for a '89-'91 L98/TPI? Looking at a very low mileage car but the plug wire are routed above the exh manifolds along the base of the vlv cover. I dont think that can be stock and wonder why they moved them on a low mileage car when they should be good for at least a 100K mi..
Sorry for late weekend request but maybe some of you experts are still awake.
Sorry for late weekend request but maybe some of you experts are still awake.