86 Vette Barely Starts
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86 Vette Barely Starts - 9/2/2008 8:09:50 PM
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firedragon78
Posts: 13
Joined: 9/2/2008
Status: offline
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Ok,first off "HELLO EVERYBODY".I`m new to the forum and need a little help!I have an 86 Vette that tries to start,but won`t.It sometimes starts with barely an idle(really rough and lopes)buy dies after about 10 seconds.The car was sitting for about a month prior to this and at that time ran good with the exception that after it heated up the idle would go up and down.I thought this to be the fuel pressure regulator,but after hooking up a pressure gauge found it was not.Now my bigger problem is getting it to start and stay running.I changed out the cap and rotor,NO DIFFERENCE!I reset the IAC valve then checked the TPS for the correct voltage setting,which was fine.Also installed a new O2 sensor,NO HELP!I`m thinking EGR,maybe Knock Sensor or Ignition Module?I will be checking for spark,but when I changed out the cap I used a coil from my other 87 Vette which does run.Again it did not make a difference.Any help would be greatly appreciated!I`m a good weekend mechanic who knows a little and learn as I go.
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RE: 86 Vette Barely Starts - 9/2/2008 8:26:44 PM
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blueshark
Posts: 2170
Joined: 7/20/2006
From: Dickson, TN.
Status: offline
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First, Welcome to the site. Glad to have ya. As for your Vette. Sounds like you''''ve checked alot as I did. From your description of the symptoms it sounds like the same thing I had with my ''''87. It turned out to be the ECM in the Dist. whether it was worn out or the grease on the bottom side had dried out I''''m not sure, but replacing it fixed the problem. I''''m not sure of any way to test them other than replacing them. Unfortunately there are so many damn things it could be that the process of elimination is sometimes the only thing you can do. Good luck with it, Cheers
_____________________________
God Speed Rich.
www.larosadesign.net
Design, Engineering,Tooling
www.stantonscustomrods.net
"Welcome to Tennessee,
The patron state of shootin' stuff".......Shooter
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RE: 86 Vette Barely Starts - 9/3/2008 12:50:40 PM
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firedragon78
Posts: 13
Joined: 9/2/2008
Status: offline
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Hi and thanks for the welcome Blueshark.Yeah I`m going through the motions checking everything.Vacuum lines,electrical connectors,sensor settings and anything else I`m reading about.When you say the ECM in the distributor,you mean the Ignition Module.I found a couple online and for the price I`m going to order one and change it out.We`ll see where that gets me!Hopefully back on the road or should I say my Fiance back on the road(its her car).Meanwhile I will keep checking over everything and doing the test I can do.Any other thoughts you or anyone can offer I will gladly listen!
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RE: 86 Vette Barely Starts - 9/3/2008 6:30:30 PM
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mech259
Posts: 1759
Joined: 1/22/2006
From: Lumberton, Texas
Status: offline
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First, unplug the MAF and which puts it in backup mode. If the car starts and idles, it probably is the problem. Lots of history with MAF on tuned port engines. 
_____________________________
L.B.
ASE Master Certified
L1 Emissions Certified
1986 C4
1969 RS Z28 Camaro
1970 Chevelle SS 396 (under construction)
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RE: 86 Vette Barely Starts - 9/3/2008 7:27:25 PM
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firedragon78
Posts: 13
Joined: 9/2/2008
Status: offline
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Thanks Mech259,I`ll give it a try tomorrow.I am getting a code 34,but I put my MAF from my 87 on there and it still does the same thing.Not sure what that means,but I`ll try anything.Tried starting it again today and it had a small backfire through the throttle body.Any suggestions on this?I`ll let you how I make out!Thanks Again.Tom
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RE: 86 Vette Barely Starts - 9/4/2008 3:28:10 PM
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mech259
Posts: 1759
Joined: 1/22/2006
From: Lumberton, Texas
Status: offline
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How many miles on the car? Can you check ignition timing? Code 34 has to do with MAF. Your supply voltage to the sensor may be the problem, so try the test I suggested.
_____________________________
L.B.
ASE Master Certified
L1 Emissions Certified
1986 C4
1969 RS Z28 Camaro
1970 Chevelle SS 396 (under construction)
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RE: 86 Vette Barely Starts - 9/4/2008 7:39:36 PM
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firedragon78
Posts: 13
Joined: 9/2/2008
Status: offline
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FIRST let me apologize for the lengthy post you are going to read! .After erasing the code 34 from the ECM I gave the test you suggested(Mech259) and still no change.Any idears(ideas) as to my next move?I thought about timing,but how would the timing have got so far out just from sitting for about a month?Ok,I better tell you this,prior to this I changed out the throttle body.I used the TPS,IAC and its housing from my throttle body on the used replacement one.Reason for the change?The throttle was sticking and in doing some research I found that the cause for this was a warped throttle rod.After doing this everything was running and working fine except for a problem with the engine idling up and down after it heated up.This problem already existed,so it was not a result of throttle body change.Thought it was a bad fuel pressure regulator,but a simple test with a pressure gauge ruled this out,I THINK!Did however notice that when I disconnected the canister solenoid the motor did not idle up and down so bad anymore.At this point the car sat for about a month and that leads us to where we are now,A NON RUNNING CORVETTE!
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