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86 corvette won't start


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krballard67@gmail.com
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Mar 3, 2012, 2:44 PM

Post #1 of 26 (2112 views)
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86 corvette won't start Sign In

I have an 86 corvette coupe it won't start the vats has been bypassed it turns over and fires but won't run help before i go crazy thanks i also forgot there is no pulse from the injectors but it tries to start doesn't make sense to me please help


(This post was edited by krballard67@gmail.com on Mar 3, 2012, 3:26 PM)


Discretesignals
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Mar 3, 2012, 5:00 PM

Post #2 of 26 (2049 views)
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Re: 86 corvette won't start [In reply to] Sign In

What is the fuel pressure? How did you confirm injector pulse? Did you check one or did you check all injectors for pulse? Any troubles codes stored in the ECM?





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(This post was edited by Discretesignals on Mar 3, 2012, 5:04 PM)


krballard67@gmail.com
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Mar 3, 2012, 5:04 PM

Post #3 of 26 (2040 views)
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Re: 86 corvette won't start [In reply to] Sign In

The fuel pressure is at 40lbs


Discretesignals
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Mar 3, 2012, 5:07 PM

Post #4 of 26 (2035 views)
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How did you confirm injector pulse? Did you check one or did you check all injectors for pulse? Any troubles codes stored in the ECM?





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krballard67@gmail.com
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Mar 3, 2012, 5:08 PM

Post #5 of 26 (2032 views)
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I only tested one injector i did it with a test light no flash from light it just dims a little no codes


Discretesignals
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Mar 3, 2012, 5:09 PM

Post #6 of 26 (2027 views)
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What kind of test light?





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krballard67@gmail.com
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Mar 3, 2012, 5:12 PM

Post #7 of 26 (2022 views)
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Just a regular 12 volt test light the car will try to start just won't it fires


Discretesignals
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Mar 3, 2012, 5:17 PM

Post #8 of 26 (2018 views)
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Don't use a 12 volt test light to test for injector pulse. 12 volt test lamp draws too much current for the ECM's injector driver to handle. You can pop a driver if there is too much current flow. You need to get hold of a injector noid light for GM port injection. Test all the injector circuits for pulse. If you have a scope, you can use that to test for injector pulse also.








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Discretesignals
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Mar 3, 2012, 5:20 PM

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Did you check for spark on all the plug wires using a spark tester? Should be a nice big fat whitish/blue spark that will easily jump a 0.060 gap.





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krballard67@gmail.com
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Mar 3, 2012, 5:26 PM

Post #10 of 26 (2009 views)
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I will go in the morning and get the noid light and i'll get back to you then i really appreciate your help this car is driving me crazy i bought it as a project car it ran then all the sudden won't start been trying to figure it out for a week now i changed the filter thinking that might be it still did the same thing


Discretesignals
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Mar 3, 2012, 5:30 PM

Post #11 of 26 (2006 views)
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If you run all these tests, you should be able to figure out what is missing. You'll eventually narrow it down to the culprit. Just want to use the correct test equipment, so you get reliable results. Perseverance pays off.





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krballard67@gmail.com
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Mar 3, 2012, 5:33 PM

Post #12 of 26 (2002 views)
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Thanks for your time i will let you know how i make out


krballard67@gmail.com
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Mar 4, 2012, 1:05 PM

Post #13 of 26 (1965 views)
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I tested everything I have 45lbs of fuel pressure have good spark. No pulse from the injector now what cold cause that


Hammer Time
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Mar 4, 2012, 1:10 PM

Post #14 of 26 (1959 views)
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See if you have power to one side of the injector with the key on.

Does your check engine light come on for bulb check when the key is turned on?




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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



(This post was edited by Hammer Time on Mar 4, 2012, 1:12 PM)


krballard67@gmail.com
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Mar 4, 2012, 1:14 PM

Post #15 of 26 (1951 views)
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With the key on i have power to both sides


Hammer Time
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Mar 4, 2012, 1:16 PM

Post #16 of 26 (1948 views)
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What about the check engine light?

I'll let DS weigh in on this but it's starting to point to the ECM but still needs more testing.




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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



krballard67@gmail.com
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Mar 4, 2012, 1:20 PM

Post #17 of 26 (1939 views)
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Yes the service engine light comes on


krballard67@gmail.com
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Mar 4, 2012, 1:25 PM

Post #18 of 26 (1935 views)
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Re: 86 corvette won't start [In reply to] Sign In

I was also told it could be the pick up coil in the distributor is that an option


Hammer Time
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Mar 4, 2012, 3:02 PM

Post #19 of 26 (1921 views)
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No, not if you have spark.




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krballard67@gmail.com
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Mar 4, 2012, 3:08 PM

Post #20 of 26 (1915 views)
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So it's either the computer or the vats then iu


Discretesignals
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Mar 4, 2012, 3:11 PM

Post #21 of 26 (1910 views)
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Is possible, but kind of rare. I have only seen one incidence in which the pickup wasn't producing a strong enough signal to the ICM. The ICM would trigger the coil, but the ECM wasn't getting a reference signal to fire the injectors.

Check your engine grounds. I don't remember where the computer ground is on one of those, but check around the thermostat housing bolts.

Probably a good place to start would be to remove the distributor cap and rotor and inspect inside. Inspect the ICM connectors which often fall apart or the terminals are corroded. If all the stuff in the distributor is original and looks pretty bad, your probably better off replacing the distributor assembly. You can also overhaul the distributor if you choose.

If everything look good in the distributor, your going to have to get to the ECM and remove it's connectors. Inspect the connectors and terminals. Ohm check the ref circuit (purple/white wire at the 24 pin connector pin 5) back to the ICM and make sure you don't have an open or short to ground.

Reconnect everything back up. If the circuit is good, unplug the distributor connector and take your 12 volt test lamp and connect it to battery positive. Then momentary touch the purple/white wire at the distributor connector while watching your NOID light with the ignition on. See if the light flashes.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


Hammer Time
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Mar 4, 2012, 3:11 PM

Post #22 of 26 (1907 views)
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I never said that. I said it needs more testing.
I never suggested the security system because you would have no crank with the Passkey system.




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krballard67@gmail.com
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Mar 4, 2012, 3:18 PM

Post #23 of 26 (1900 views)
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Okay thank you sir i'll check them out and let you know what i find


krballard67@gmail.com
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Mar 4, 2012, 3:22 PM

Post #24 of 26 (1899 views)
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Okay i'll keep testing and see what i find thank you.


Hammer Time
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Mar 4, 2012, 3:29 PM

Post #25 of 26 (1893 views)
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What is it that you're planning on testing?

What you need to do is verify all the power and ground inputs along with the distributor signals to the ECM






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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.





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