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

111,185

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.
111,185

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.
111,185

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.
111,185

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.
111,185

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.
111,185

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.
111,185

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?

Your Answer

Add photo

Related Questions

  • changed optispark in 94 5.7 starts up but wont take throttle 11 answers

    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

    1994 Chevrolet Camaro Z28

    -

    Maintenance & Repair

  • wont take throttle 3 answers

    changed optispark and plugs &wires starts up but wont take throttle

    1994 Chevrolet Camaro Z28

    -

    Maintenance & Repair

  • I HAVE AN 86 CAMERO IT STARTS BUT WONT CRANK HAS GAS 8 answers

    CAR WILL START BUT WONT CRANK SAYS IT HAS GAS CAN HEAR THE FUEL PUMP KICK ON AND OFF

    1986 Chevrolet Camaro

    -

    Maintenance & Repair

  • wont start in cold 2 answers

    2001 V6 convertible, AZ car moved to CT and now wont start when outside temps are cold

    2001 Chevrolet Camaro Base Convertible

    -

    Maintenance & Repair

  • 92 camero z28 turns over but wont fire ul 1 answer

    Car turns over but no fire. I have changed plugs and wire cap and button

    1992 Chevrolet Camaro Z28

    -

    Maintenance & Repair

Camaro

Looking for a Used Camaro in your area?

CarGurus has 31,906 nationwide Camaro listings starting at $1,000.

ZIP:

Search Chevrolet Camaro Questions

Chevrolet Camaro Experts

#1 dandyoun
dandyoun
Reputation 1,740
#2 carGrrl
carGrrl
Reputation 1,160
#3 Tom Demyan
Tom Demyan
Reputation 1,070
View All

Related Models For Sale

Used Ford Mustang
637 Great Deals out of 46,709 listings starting at $750
Used Chevrolet Corvette
165 Great Deals out of 21,311 listings starting at $2,500
Used Chevrolet Impala
625 Great Deals out of 35,400 listings starting at $899
Used BMW 3 Series
962 Great Deals out of 30,763 listings starting at $1,000
Used Ford F-150
2,067 Great Deals out of 208,407 listings starting at $290
Used Jeep Wrangler
267 Great Deals out of 16,406 listings starting at $2,695
Used Pontiac Firebird
11 Great Deals out of 773 listings starting at $3,490
Used Honda Accord
1,039 Great Deals out of 77,388 listings starting at $999
Used Chevrolet Tahoe
589 Great Deals out of 32,673 listings starting at $1,500
Used Jeep Grand Cherokee
1,080 Great Deals out of 73,070 listings starting at $1,200

Used Cars For Sale

2015 Chevrolet Camaro Z28 For Sale
41 listings starting at $41,990
2014 Chevrolet Camaro Z28 For Sale
14 listings starting at $41,999

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.