changed optispark in 94 5.7 starts up but wont take throttle

60

Asked by Apr 19, 2014 at 12:01 PM about the 1994 Chevrolet Camaro Z28

Question type: Maintenance & Repair

replaced plugs and wires also double checked them not missing.
also pulled left valve pan to make sure everything was at top dead center on compression could i be fighting another problem

11 Answers

115,005

Could be your throttle position sensor failing. It sends a reference signal to computer as to where the throttle is. Should be showing .5 volts at idle and smoothly climb to 4.5-5 volts at full throttle. If the signal is anything other than this or it jumps around as throttle is moved your car will not run properly.

3 of 3 people found this helpful.
115,005

http://autorepair.about.com/library/firing_orders/bl-fo-7066.htm -- check this out if there is a chance that the plug wires were not installed in the correct order.

1 of 1 people found this helpful.
115,005

Was it acting this way before you did the work on it?

2 of 2 people found this helpful.
60

the reason i changed the opti is because it wouldnt start now it starts right up but it also heats up fast. do you have to reset the computer or somethin

3 of 3 people found this helpful.
60

it dont miss like its out of time and from what i seen it could only be out 180 from changing the opti but then it shouldnt start but it heats up really fast in about 3 minutes like its out of time

1 of 1 people found this helpful.
115,005

http://shbox.com/1/93-94_opti.jpg -- it should only be able to go in one way with the shaft keyed like it is. Does that picture match yours?

6 of 6 people found this helpful.
115,005

http://ls1tech.com/forums/lt1-lt4-modifications/1169758-95-lt1-timing- while-installing-optispark.html -- check this out. It seems it can be install wrong and act like yours is. You might find some of the info on this link useful.

6 of 6 people found this helpful.
115,005

http://diysrc.com/1993-97-remove-and-replace-optispark-distributor- camaro-firebird/ -- here is something else that might be useful.

7 of 7 people found this helpful.
60

finally got it took it back apart turned the opti shaft 1 revelotion put it back on and it runs better than ever

2 of 2 people found this helpful.
115,005

That's great. Glad you got it going.

1 of 1 people found this helpful.

I changed my optispark on my 97 z28 lt1. Before I changed optispark it was still running but very hottt meaning backfires and random misfires. Now that I put new optispark times my timing chain correctly and put everything back on I start it up and it wants to fire up when I give it gas from throttle but when I let go of throttle it shuts right off. I don't know the cause of this please help!! Dealership on the phone and autozone people are telling me it could be my fuel pressure is low or I need a new fuel pump. The fuel pump itself hums when I turn the key. What's the cause of it?

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