Main IndexAuto Repair Home Search Posts SEARCH
POSTS
Who's Online WHO'S
ONLINE
Log in LOG
IN







86 corvette won't start


First page Previous page 1 2 Next page Last page  View All Email This Post



krballard67@gmail.com
User

Mar 3, 2012, 2:44 PM

Post #1 of 26 (1776 views)
Shortcut
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
Veteran / Moderator


Mar 3, 2012, 5:00 PM

Post #2 of 26 (1713 views)
Shortcut
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?





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

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


krballard67@gmail.com
User

Mar 3, 2012, 5:04 PM

Post #3 of 26 (1704 views)
Shortcut
Re: 86 corvette won't start [In reply to] Sign In

The fuel pressure is at 40lbs


Discretesignals
Veteran / Moderator


Mar 3, 2012, 5:07 PM

Post #4 of 26 (1699 views)
Shortcut
Re: 86 corvette won't start [In reply to] Sign In

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?





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


krballard67@gmail.com
User

Mar 3, 2012, 5:08 PM

Post #5 of 26 (1696 views)
Shortcut
Re: 86 corvette won't start [In reply to] Sign In

I only tested one injector i did it with a test light no flash from light it just dims a little no codes


Discretesignals
Veteran / Moderator


Mar 3, 2012, 5:09 PM

Post #6 of 26 (1691 views)
Shortcut
Re: 86 corvette won't start [In reply to] Sign In

What kind of test light?





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


krballard67@gmail.com
User

Mar 3, 2012, 5:12 PM

Post #7 of 26 (1686 views)
Shortcut
Re: 86 corvette won't start [In reply to] Sign In

Just a regular 12 volt test light the car will try to start just won't it fires


Discretesignals
Veteran / Moderator


Mar 3, 2012, 5:17 PM

Post #8 of 26 (1682 views)
Shortcut
Re: 86 corvette won't start [In reply to] Sign In

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.








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


Discretesignals
Veteran / Moderator


Mar 3, 2012, 5:20 PM

Post #9 of 26 (1677 views)
Shortcut
Re: 86 corvette won't start [In reply to] Sign In

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.





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


krballard67@gmail.com
User

Mar 3, 2012, 5:26 PM

Post #10 of 26 (1673 views)
Shortcut
Re: 86 corvette won't start [In reply to] Sign In

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
Veteran / Moderator


Mar 3, 2012, 5:30 PM

Post #11 of 26 (1670 views)
Shortcut
Re: 86 corvette won't start [In reply to] Sign In

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.





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


krballard67@gmail.com
User

Mar 3, 2012, 5:33 PM

Post #12 of 26 (1666 views)
Shortcut
Re: 86 corvette won't start [In reply to] Sign In

Thanks for your time i will let you know how i make out


krballard67@gmail.com
User

Mar 4, 2012, 1:05 PM

Post #13 of 26 (1629 views)
Shortcut
Re: 86 corvette won't start [In reply to] Sign In

I tested everything I have 45lbs of fuel pressure have good spark. No pulse from the injector now what cold cause that


Hammer Time
Ultimate Carjunky / Moderator


Mar 4, 2012, 1:10 PM

Post #14 of 26 (1623 views)
Shortcut
Re: 86 corvette won't start [In reply to] Sign In

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?




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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
User

Mar 4, 2012, 1:14 PM

Post #15 of 26 (1615 views)
Shortcut
Re: 86 corvette won't start [In reply to] Sign In

With the key on i have power to both sides


Hammer Time
Ultimate Carjunky / Moderator


Mar 4, 2012, 1:16 PM

Post #16 of 26 (1612 views)
Shortcut
Re: 86 corvette won't start [In reply to] Sign In

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.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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
User

Mar 4, 2012, 1:20 PM

Post #17 of 26 (1603 views)
Shortcut
Re: 86 corvette won't start [In reply to] Sign In

Yes the service engine light comes on


krballard67@gmail.com
User

Mar 4, 2012, 1:25 PM

Post #18 of 26 (1599 views)
Shortcut
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
Ultimate Carjunky / Moderator


Mar 4, 2012, 3:02 PM

Post #19 of 26 (1585 views)
Shortcut
Re: 86 corvette won't start [In reply to] Sign In

No, not if you have spark.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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
User

Mar 4, 2012, 3:08 PM

Post #20 of 26 (1579 views)
Shortcut
Re: 86 corvette won't start [In reply to] Sign In

So it's either the computer or the vats then iu


Discretesignals
Veteran / Moderator


Mar 4, 2012, 3:11 PM

Post #21 of 26 (1574 views)
Shortcut
Re: 86 corvette won't start [In reply to] Sign In

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
Ultimate Carjunky / Moderator


Mar 4, 2012, 3:11 PM

Post #22 of 26 (1571 views)
Shortcut
Re: 86 corvette won't start [In reply to] Sign In

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.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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
User

Mar 4, 2012, 3:18 PM

Post #23 of 26 (1564 views)
Shortcut
Re: 86 corvette won't start [In reply to] Sign In

Okay thank you sir i'll check them out and let you know what i find


krballard67@gmail.com
User

Mar 4, 2012, 3:22 PM

Post #24 of 26 (1563 views)
Shortcut
Re: 86 corvette won't start [In reply to] Sign In

Okay i'll keep testing and see what i find thank you.


Hammer Time
Ultimate Carjunky / Moderator


Mar 4, 2012, 3:29 PM

Post #25 of 26 (1557 views)
Shortcut
Re: 86 corvette won't start [In reply to] Sign In

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






~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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.





86 corvette won't start


First page Previous page 1 2 Next page Last page  View All Email This Post
 
 






Latest Forum Post
Hello all, I have 1993 Infiniti G20 : 215,000 miles. the car was running very ...
I have a 1996 Ford Crown vic with a 4.6 L. automatic major frame rust issues, bu...
2007 pontiac grand am - 30,000 miles - my rear passenger window made noise today...
Chevron and some other gas stations claim to have superior gasoline. Chevron ha...
I have a 2002 lincoln sedan. It has a small nick in the oil pan and was leaking ...
1998 Toyota Rav 4 with 350k A/C would work and then stop working then after car...

Feed Button


Used Car Search
Used Car Price Ranges:
Under $5,000
$20,000
$35,000

$10,000
$25,000
$40,000
$15,000
$30,000
$45,000
Over $45,000
Search used Cars By Manufacturers:
Used Acura
Used Audi
Used BMW
Used Buick
Used Cadillac
Used Chevrolet
Used Chrysler
Used Dodge
Used FIAT
Used Ford
Used GMC

Used Honda
Used Hyundai
Used Infiniti
Used Jaguar
Used Jeep
Used Kia
Used Land Rover
Used Lexus
Used Lincoln
Used Mazda
Used Mercedes-Benz

Used MINI
Used Mitsubishi
Used Nissan
Used Porsche
Used Saab
Used Scion
Used Subaru
Used Suzuki
Used Toyota
Used Volkswagon
Used Volvo
2010 Honda Civic
$15,770
2004 Jeep
$8,991
2012 Mustang
$22,990
1997 Honda Cr-V
$4,490
2010 Toyota Prius
$17,496
2010 BMW 328
$26,980




Automotive Forum Categories
Automotive Repair
Auto Body Repair and Refinishing
AC Auto Repair Help Forum
Automotive Wiring and Electrical

Auto Insurance and Car Financing
Automotive World
Brake Systems
Car Stereo Repair Advice
Car Troubleshooting
Engine and Car Noises
Engine Fault Codes
Engine Troubleshooting
Exhaust System Repair

Steering and Suspension
Tricks of the Trade
General Discussions
Car Shows and Events
The Bargin Bin
Motor Vehicle Inspection
Car Care Tips
Traffic Ticket Help
Car Racing

Gasoline, Motor Oils, Concept Cars
Remote Control Cars and Vehicles
Truck Repair
Truck Repair Advice


Truck Engine Repair
Truck Suspension Repair
Motorcycle Repair
Motorcycle and ATV Repairs

Motorcycle Body Repair
Motorcycle Clutch Repair
Motorcycle Engine Repair
Motorcycle Seat Repair
Car Forum Posts - Sitemap


Search for (options) Privacy