no start on 94 lt1
#1
no start on 94 lt1
Hey Guys,
Was out with my rod the other day and encountered a weird
scenario. When my 4l60e tranny shifted from first to second gear I was taching at about 4500 rpm. My car started to stumble a bit then backfired.
I coasted to a stop and tried to re-start. I have yet to be able to start the car since. It will just crank. I have replaced my opti-spark and ignition control module about six months ago. Any suggestions where to begin?
Was out with my rod the other day and encountered a weird
scenario. When my 4l60e tranny shifted from first to second gear I was taching at about 4500 rpm. My car started to stumble a bit then backfired.
I coasted to a stop and tried to re-start. I have yet to be able to start the car since. It will just crank. I have replaced my opti-spark and ignition control module about six months ago. Any suggestions where to begin?
#2
Re: no start on 94 lt1
Do you have spark on the coil wire, and at the plugs? Did you loc-tite the rotor screws when you installed the Opti? What brand is the Opti?
Scan it for codes. Check the fuel pressure.
Scan it for codes. Check the fuel pressure.
#3
Re: no start on 94 lt1
Isn't there a way to spray starting fluid into the motor and if it starts then shuts off,then it's the fuel pump.If it still doesn't start then it's electrical.Sorry,old school here.Hope this helps.
#4
Re: no start on 94 lt1
Got your e-mail response. Would prefer you reply in the thread, so others can participate in helping you.
We don't know if the Opti is the problem. Do the diagnostics first. And answer ALL the questions:
-did you loc-tite the rotor screws?
-do you have spark at the coil wire = Opti optical sensor working?
-do you have spark at the plugs = cap/rotor working (although not ruling out a loose rotor).
-did you scan it for codes? There are two codes for the optical sensor.
-what are results of fuel pressure check?
Here's another way to check the Opti:
4th Gen LT1 F-body Tech Articles
Thank you for responding. I installed a CARQUEST Advance Auto Store Opti-Spark about 6 months ago. Seemed to work ok until now. Can you recommend a better brand unit? I am going to check fuel pressure today
and get back to you. Thanks again. Frank
and get back to you. Thanks again. Frank
-did you loc-tite the rotor screws?
-do you have spark at the coil wire = Opti optical sensor working?
-do you have spark at the plugs = cap/rotor working (although not ruling out a loose rotor).
-did you scan it for codes? There are two codes for the optical sensor.
-what are results of fuel pressure check?
Here's another way to check the Opti:
4th Gen LT1 F-body Tech Articles
#5
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Re: no start on 94 lt1
Watch this video. The tachometer needle should rise to about 100-200 rpm while cranking. If it does not, it probably means the Optispark distributor or it's cable is not working.
#6
Re: no start on 94 lt1
Watch this video. The tachometer needle should rise to about 100-200 rpm while cranking. If it does not, it probably means the Optispark distributor or it's cable is not working.
LT1 tach view while cranking with start disabled. - YouTube
LT1 tach view while cranking with start disabled. - YouTube
dancing around inside the opti-spark unit. Don't know if it did any other damage but just to be safe I ordered an AC delco unit from Summit and
I will definitely lock-tite the screw.
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