Notices
C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

1991 Coupe Ignition

 
Old 01-30-2015, 10:36 PM
  #1  
hgoodwiniii
CF Senior Member
Support Corvetteforum!
Thread Starter
 
hgoodwiniii's Avatar
 
Member Since: Sep 2002
Location: Houston Tx
Posts: 566
Thanked 4 Times in 4 Posts
Default 1991 Coupe Ignition

Hi all, I seem to be having an intermittent enging starting problem brewing with my C4. At times, after driving it and turning it off, I go to crank it a few minutes afterwards and I get nothing from the starter. No click, no spin, nothing. No indication that the fuel pump is coming on either. However, the dash lights light up as they normally do when the key is turned to crank position. I'm pretty sure it's not the VATs. This normally happens with one or 2 turns of the key and then the car starts on the subsequent try. Tonight this happened and it took several tries and about 30 minutes before the car cranked and it has been cranking fine ever since

Any ideas on this? I would think I would hear a click or something if it were the starter? Could it be that ignition switch that sits in the center console that engages with the gear shifter going out?
hgoodwiniii is offline  
Old 01-31-2015, 10:06 AM
  #2  
jispr
CF Senior Member
 
jispr's Avatar
 
Member Since: Sep 2004
Location: Lawrenceville GA
Posts: 206
Thanks: 0
Thanked 0 Times in 0 Posts
Default

If this only happens when the motor is warm I would lean towards the starter and/or solenoid. But consider the key is just the beginning, clean the pellet/resister of the key. Then you have Passkey security. (is the security light on when the key is turned to on?) After Passkey comes the CCM, the starter relay, the starter. If you don't hear the fuel pump start, then it's most likely Passkey or that harness between the key and the CCM. The console switch I assume is the neutral safety switch and yes it's there to stop the engine from starting while the trans is in gear. A factory service manual has the troubleshooting
procedures you need. I may be telling you something you already know but you didn't let on.
jispr is offline  
Old 01-31-2015, 12:44 PM
  #3  
hgoodwiniii
CF Senior Member
Support Corvetteforum!
Thread Starter
 
hgoodwiniii's Avatar
 
Member Since: Sep 2002
Location: Houston Tx
Posts: 566
Thanked 4 Times in 4 Posts
Default

Originally Posted by jispr View Post
If this only happens when the motor is warm I would lean towards the starter and/or solenoid. But consider the key is just the beginning, clean the pellet/resister of the key. Then you have Passkey security. (is the security light on when the key is turned to on?) After Passkey comes the CCM, the starter relay, the starter. If you don't hear the fuel pump start, then it's most likely Passkey or that harness between the key and the CCM. The console switch I assume is the neutral safety switch and yes it's there to stop the engine from starting while the trans is in gear. A factory service manual has the troubleshooting
procedures you need. I may be telling you something you already know but you didn't let on.
Yep, a lot of that I do know. You are right it only happens after the car is warm and has been ran for a bit. I'm leaning toward the starter. I think I'll just go ahead a swap it out for now and see if that gets rid of the problem.
hgoodwiniii is offline  
Old 02-03-2015, 11:58 PM
  #4  
Jaxley
CF Member
 
Jaxley's Avatar
 
Member Since: May 2014
Location: Raleigh NC
Posts: 72
Thanked 0 Times in 0 Posts
Default

Should be able to test the voltages going to the starter to verify they are switching when the key is turned as well. Might save you some heart ache if you find no voltage going to the starter to begin with.
Jaxley is online now  
Old 02-04-2015, 09:41 AM
  #5  
tbirdsps
CF Senior Member
 
tbirdsps's Avatar
 
Member Since: Apr 2012
Location: Ridgecrest Ca
Posts: 888
Thanks: 0
Thanked 1 Time in 1 Post
Default

Most likely the starter solenoid contacts are worn/burnt. Happened to mine.
tbirdsps is offline  
Old 02-04-2015, 12:55 PM
  #6  
trackbird
CF Senior Member
 
Member Since: Mar 2012
Location: Columbus Oh
Posts: 456
Thanks: 0
Thanked 3 Times in 3 Posts
Default

My 1991 would occasionally do the same thing. Hooking it up to a set of jumper cables would start it. The battery was fine and tested as good. I installed a new battery and it didn't change things. I checked voltage when it was running and it is charging. Ultimately I believe it's my starter disable relay from the VATS system. I tried to remove it from the panel behind the instrument cluster and couldn't get it loose (gave up on standing on my head that day). Since then I've replaced the engine and I've been busy with other things.

If you can get under the car and hook a 12v light bulb to the trigger lead on the starter (and ground the other side) and duplicate the problem, if the light is on...it's the starter. If the light doesn't light, it's likely in the key switch or the relay.
trackbird is offline  
Old 02-04-2015, 01:21 PM
  #7  
70ZZ3 96LT4
CF Senior Member
 
Member Since: Oct 2001
Location: TN
Posts: 911
Thanks: 0
Thanked 2 Times in 2 Posts
Default fuel pump relay

Driving my 1996 and my 1985 Corvettes I always turn the key to only the "on" position and listen for the fuel pump relays which only activate the fuel pump for about 2 seconds and click off. I don't try to start my Corvettes until the relays click off. They always start immediately using this procedure. If I would not hear a relay click off after I turn the key to the on position that would indicate to me the relay is bad or it is not getting electrical power from turning to the on position in using the ignition switch.
70ZZ3 96LT4 is offline  
Old 02-04-2015, 10:01 PM
  #8  
jv9999
CF Senior Member
 
jv9999's Avatar
 
Member Since: Jan 2014
Location: Lunenburg MA
Posts: 1,106
Thanked 70 Times in 70 Posts
Default

I had a similar problem with my '87. It turned out to be the starter inhibit relay. Drove me crazy for a couple months.
jv9999 is offline  
Old 02-27-2015, 01:10 PM
  #9  
hgoodwiniii
CF Senior Member
Support Corvetteforum!
Thread Starter
 
hgoodwiniii's Avatar
 
Member Since: Sep 2002
Location: Houston Tx
Posts: 566
Thanked 4 Times in 4 Posts
Default

I have a nasty oil leak that is leaking oil on the starter; I'm guessing this may be the problem.
hgoodwiniii is offline  
Old 02-28-2015, 05:25 AM
  #10  
HlhnEast
CF Senior Member
 
HlhnEast's Avatar
 
Member Since: Nov 2008
Location: Jacksonville FL
Posts: 4,328
Thanked 13 Times in 13 Posts
Default

Originally Posted by hgoodwiniii View Post
I have a nasty oil leak that is leaking oil on the starter; I'm guessing this may be the problem.
You have probly narrowed down your cause and problem. Oil plays hell with the solenoid, dirtying up contacts, shorting out wiring, all kinds of issues. Try the new starter but until you fix the oil leak the problem will persist. Warm starting issues also point to the solenoid at the end of its usefulness.
HlhnEast is offline  
Old 03-12-2019, 02:47 PM
  #11  
hgoodwiniii
CF Senior Member
Support Corvetteforum!
Thread Starter
 
hgoodwiniii's Avatar
 
Member Since: Sep 2002
Location: Houston Tx
Posts: 566
Thanked 4 Times in 4 Posts
Default

Finally got around to figuring out this intermittent engine starting problem with my C4 about a month ago; Seems the problem was the ignition switch that mounts under the dash on top of the steering column was giving out.
hgoodwiniii is offline  
Old 03-13-2019, 06:14 PM
  #12  
Jeffgett
Junior Member
 
Member Since: Feb 2016
Posts: 24
Thanked 4 Times in 4 Posts
Default

That is the same procedure I have always used for my 85 and it starts immediately as well.
Jeffgett is offline  
 


Thread Tools
Search this Thread
Quick Reply: 1991 Coupe Ignition


Sponsored Ads
Vendor Directory

Contact Us - About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: