C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Ready to call the tow truck

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Old 08-08-2006, 08:37 PM
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RetroTA
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Default Ready to call the tow truck

93 LT1 Auto 47,000mi
-Was getting Code16 (bad Opti)
-Brand new MSD Opti (Getting spark at all cyls.)
-Quadruple checked plug wires
-New Plugs
-Brand new Ford injectors 24#
-NOID test: Pulses at all injectors
-New fuel filter
-Siphoned and replaced fuel
-Fuel pressure:43lbs (will hold all day)
-New ICM & Coil
-Swaped ECM with a known working ECM
-Snap-On scanner shows no fault
-VATS disabled
-Cranks But no start, Will sputter out the intake
only after cranking. Never a reaction while cranking?
-MSD Tech says: "If your getting spark the Opti
is not defective." I didnt believe him, exchanged it and
still no luck!

Last edited by RetroTA; 09-19-2006 at 06:49 AM.
Old 08-08-2006, 08:49 PM
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red_johnny
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Stange. If its pulsing gas and spittin fire, then there should be no problems. Does it even try to start? Only other thing would be air since you have fuel and spark. Try checking your oil level as sometimes there is a sensor to keep you from starting on really low oil. I know I am not much help and I am sure someone else will chime in here.
Old 08-08-2006, 08:52 PM
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Pete K
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Old gas or contaminated gas? Did it happen shortly after a fill up?
Compression, spark, fuel and proper timing should allow it to at least run., even if badly.
Old 08-08-2006, 08:58 PM
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AGENT 86
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Originally Posted by RetroTA
93 LT1 Auto 47,000mi
-Brand new MSD Opti (Getting spark at all cyls.)
Any last sugestions?

Oh Yea, Not throwing any codes.
Did the problem start after the opti install ??
Firing order is correct and on time ??
Old 08-08-2006, 08:59 PM
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CentralCoaster
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Well, towing it somewhere else means they're going to replace all that stuff all over again with cheap Chinese parts, then call you back with the same result.
Old 08-08-2006, 09:16 PM
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RetroTA
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All this was replaced trouble shooting the same no-start condition.
Checked and doublechecked ign. wires. It cranks and no start, but when I stop cranking it will sputter a little once or twice? In all reality I would never have it towed, But I just cant think of anything else.

Last edited by RetroTA; 08-08-2006 at 09:18 PM.
Old 08-08-2006, 09:26 PM
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zr1fred
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I'd look at the ignition module, and then I'd check compression. Just because you have spark, doesn't mean you have spark at the correct time.
Old 08-08-2006, 09:29 PM
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AORoads
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"In honor of jpee"

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Cap and rotor installed correctly?
Old 08-08-2006, 09:32 PM
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RetroTA
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Thats a good point Fred, I didnt know the module could effect timing?
Ill try that next. New MSD went on without a glitch, It can only go on
one way due to the splined shaft. I hear AutoZone or most of the chain
stores can check your ICM is this true?

Last edited by RetroTA; 08-08-2006 at 09:37 PM.
Old 08-08-2006, 09:35 PM
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zr1fred
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Originally Posted by LT4CompYell
Cap and rotor installed correctly?
It's easy to get 180 deg. out!
Old 08-08-2006, 09:38 PM
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RetroTA
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What would would cause a 180? MSD can only go on one way, Besides
I had the same problem with my original OPTI? Im not trying to argue
but I never messed with the new distributor out of the box and there
is no indication in the instructions that it could be installed 180 deg off.

Last edited by RetroTA; 08-08-2006 at 09:42 PM.
Old 08-08-2006, 09:44 PM
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sonomacrew01
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what kind of scanner are you using? This may sound silly but I had a bad ECM that threw no codesand the sensors were all way out of wack. Caused the car to dosome weird stuff. The mechanic told me he was suprised it was even running.

A) fuel pressure is goodat the rail so the only thing would be is suggestin bad gas but your refilled.

B) Check the timing. MSD is nice..adjustable. Check the optical sensor voltage from the distributor to the ecm. I believe its the red wire.

Not sure how else to help. I've learned a bit watching my mechanic work on my 93. Coughing up a few bucks is sometimes worth it, especially when it is sitting in this beautiful weather. Find a competent mechanic
Old 08-08-2006, 10:05 PM
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aminnich
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Yes, they CAN be installed 180* off, I also learned that the hard way!
If 180* off it won't throw codes, may try to start, puff some smoke out of the intake, but it will not start. Ask around, I am positive I am right, been there and done that.
Old 08-08-2006, 10:06 PM
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RetroTA
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Old 08-08-2006, 10:42 PM
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zr1fred
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I think he means the rotor, or the extension, not the cap, if that's where you're going. the extensionis only keyed on one end.

Last edited by zr1fred; 08-08-2006 at 10:46 PM.
Old 08-08-2006, 10:52 PM
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Ttime
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Originally Posted by RetroTA
Hang in there

It does sound like timinig .

Good luck!
Old 08-08-2006, 11:10 PM
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BrianCunningham
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Sounds like what happened to me when I got the timing off.
Check it with a timing light.

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To Ready to call the tow truck

Old 08-08-2006, 11:18 PM
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zr1fred
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Originally Posted by BrianCunningham
Sounds like what happened to me when I got the timing off.
Check it with a timing light.
Has EVERYBODY done this?
:o But seriously, if you had the problem to start with, the module would be a good possibility. Sometimes Auto Zone can check them. I think they're about $30

Last edited by zr1fred; 08-08-2006 at 11:21 PM.
Old 08-08-2006, 11:23 PM
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Ttime
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Originally Posted by zr1fred
Has EVERYBODY done this?
:o But seriously, if you had the problem to start with, the module would be a good possibility. Sometimes Auto Zone can check them. I think they're about $30
Good point .
Old 08-09-2006, 12:06 AM
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On my 85 with the stock HEI distributor, I tried starting it with the cap off by 180 degrees, and it spit and belched and backfired out the intake.


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