This is a discussion on Luckluster LT1 within the LT1 forums, part of the Vehicle Specific category; Got something going on with my '93 Z28. During part throttle acceleration, the car is very sluggish. I mean, it's ...
06-14-2007, 07:27 PM #1
Got something going on with my '93 Z28. During part throttle acceleration, the car is very sluggish. I mean, it's as if it's running on less that 8 cylinders. In the the cool evening weather it gets a little better, but the is still pretty much the same. But this is the kicker -- when I go full throttle, the car comes alive and delivers full power and throttle response as if the problem never existed. A friend of mine suggested bad spark plug wires. I've changed the spark plugs, but not the wires. The wires are the original ones, and have 123,000 miles on them. Can anyone help?
06-15-2007, 12:41 PM #2
Probably the opti. I had the same sort of problem. It would miss in the lower RPM's, but at WOT, it would run like a champ. I think its time for a new opti, or at least cap and rotor.
06-17-2007, 10:45 AM #3
06-17-2007, 05:01 PM #4
If you are tired of the opti units, you could go with the Delteq setup. Its kind of similar to the LS1 coil conversion, but its a complete plug-and-play install. Its about $650 or so, but doesn't rely on spark generated from under the waterpump. Other than that, good luck on replacing it.
06-18-2007, 12:58 AM #5486/438
06-18-2007, 10:00 AM #6
- Join Date
- Nov 2005
- Kingman, AZ
- 97 Camaro Z28
I'd also look into the o2 sensors.. Sounds like they may be alittle on the slow side.. Do you have a scan tool? And can you notice any kind of missfire at ideal or mid RPM when its being slugish?
06-19-2007, 11:21 AM #7
Mine gets like that down low, had it confirmed as an opti problem... wot youd think it was dynotuned, runs amazing. below 4k or light gas, feels like its on 3 cylinders.
06-19-2007, 11:54 AM #8
- Join Date
- Mar 2006
- 1994 Camaro Z28
My experience ('94 Auto Z28) was coolant leaking into the optispark....caused the exact symptoms you d'scribed...
Another possibility is an input to your ECM going bad...O2, MAP, or throttle position sensor...all should "code" in your Diagnostic connection...and all will cause a "misread" in the ECM.
In my case, it sorta felt like a "cold engine" at moderate throttle openings. I still have the original Optispark, however...I don't think you need to replace it just to fix your symptoms...save your $$/..
06-23-2007, 01:52 PM #9
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