94 LT1 opti issues- won't rev, new opti
07-10-2015, 07:20 PM
#16
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Join Date: May 2006
Posts: 39
Re: 94 LT1 opti issues- won't rev, new opti
What "intakes"? What does that mean?
Do you possibly mean TPIS headers? No one make replacement stock manifolds, and "TPI" would be the manifolds from a 3rd Gen (possibly an L98) and would not have the D-ports like an LT1.
A complete CAI, or just a filter? If just a cone filter, where is it connected?
Do you mean a resistor added to the key read circuit, and/or a module to simulate the 30/50Hz "fuel permit" signal to the ECM?
07-12-2015, 02:26 AM
#17
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Re: 94 LT1 opti issues- won't rev, new opti
Thinking some more on how a single point on the opti oxidized and arced, I decided to check the spark plug wire for that cylinder (5). The resistance on my wires is very high. These are OEM AC Delco wires and are less than 5k miles old.
Cyl (kOhm)
1 (3.6)
2 (4.3)
5 (4.3)
7 (7.0)
8 (9.7)
No spec on this in factory manual, from info online this seems very high. Could this be part of the problem? Per recommendations from a previous thread I have ordered NGK tr55IX plugs and an MSD 8.5mm wire set.
Cyl (kOhm)
1 (3.6)
2 (4.3)
5 (4.3)
7 (7.0)
8 (9.7)
No spec on this in factory manual, from info online this seems very high. Could this be part of the problem? Per recommendations from a previous thread I have ordered NGK tr55IX plugs and an MSD 8.5mm wire set.
Last edited by asilomar244; 07-12-2015 at 02:32 AM.
07-12-2015, 05:53 AM
#18
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Location: Hell was full so they sent me to NJ
Posts: 70,825
Re: 94 LT1 opti issues- won't rev, new opti
You want to factor in the length to the wire, to get ohms/ft. Those numbers are not unusual for carbon core wire. Here's very basic info from the Advanced Auto Parts website:
When to change spark plug wires
You can test some types of spark plug wires with an ohmmeter. Basically, there are three spark plug wire types, but more on that later. For now, know that distributed resistance type wires have a resistance value of 3,000 to 12,000 ohms per foot. MAG and fixed resistor spark plug wires have much lower resistance per foot. But the actual resistance per foot isn’t important. It’s the consistency of the readings between each wire that determines if the spark plug wire is good or bad. So, measure the length and resistance of each spark plug wire and write it down. Then compare the resistance values. A bad spark plug wire will have much more resistance than another wire of equal length. That’s your signal that it’s time to change spark plug wires.
You can test some types of spark plug wires with an ohmmeter. Basically, there are three spark plug wire types, but more on that later. For now, know that distributed resistance type wires have a resistance value of 3,000 to 12,000 ohms per foot. MAG and fixed resistor spark plug wires have much lower resistance per foot. But the actual resistance per foot isn’t important. It’s the consistency of the readings between each wire that determines if the spark plug wire is good or bad. So, measure the length and resistance of each spark plug wire and write it down. Then compare the resistance values. A bad spark plug wire will have much more resistance than another wire of equal length. That’s your signal that it’s time to change spark plug wires.
Last edited by Injuneer; 07-12-2015 at 06:55 AM.
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