1990 corvette random stalling issue - CorvetteForum - Chevrolet Corvette Forum Discussion


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

1990 corvette random stalling issue

Reply
 
 
 
Thread Tools Search this Thread
Old 09-13-2017, 04:20 AM   #1
kiwivetten
Junior Member
Thread Starter
 
Member Since: Dec 2009
Location: Christchurch Canterbury
Posts: 29
Thanked 0 Times in 0 Posts
Default 1990 corvette random stalling issue

My 1990 Vette runs perfectly 99% of the time but then will randomly stall or you hear it start to die and then the computer manages to recover the idle. The computer is running a moates emulator and is re-programmed for a Vortech supercharger install. Are there any other sensors that could be faulty and cause the idle to drop off suddenly. Ive recently fitted a new o2 sensor and new distributor.

Any help appreciated. I have a Tech 1 but not trouble codes at all. As I live in New Zealand nobody knows these cars so I wont be able to get local help.
kiwivetten is offline   Reply With Quote
Old 09-13-2017, 08:37 AM   #2
JimLentz
CF Senior Member
Support Corvetteforum!
 
JimLentz's Avatar
 
Member Since: Jan 2014
Location: Downers Grove Illinois
Posts: 1,842
Thanked 147 Times in 144 Posts
Default

Quote:
Originally Posted by kiwivetten View Post
My 1990 Vette runs perfectly 99% of the time but then will randomly stall or you hear it start to die and then the computer manages to recover the idle. The computer is running a moates emulator and is re-programmed for a Vortech supercharger install. Are there any other sensors that could be faulty and cause the idle to drop off suddenly. Ive recently fitted a new o2 sensor and new distributor.

Any help appreciated. I have a Tech 1 but not trouble codes at all. As I live in New Zealand nobody knows these cars so I wont be able to get local help.
Some people have had noise issues with the length of the emulator cable and shortening it has resolved the issue.
JimLentz is offline   Reply With Quote
Old 09-13-2017, 02:39 PM   #3
HAD2HAV2
CF Senior Member
 
HAD2HAV2's Avatar
 
Member Since: Jan 2001
Location: MOORESVILLE NC
Posts: 2,551
Thanked 162 Times in 142 Posts
Default

Check your TPS sensor. I had similar problems like yours on another GM vehicle. The TPS did not throw a code but was faulty never the less.
HAD2HAV2 is offline   Reply With Quote
Old 09-13-2017, 04:18 PM   #4
kiwivetten
Junior Member
Thread Starter
 
Member Since: Dec 2009
Location: Christchurch Canterbury
Posts: 29
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by JimLentz View Post
Some people have had noise issues with the length of the emulator cable and shortening it has resolved the issue.
Thanks Jim, I have purchased a new ECU and my next step was to burn an eprom with my current software and put that into the new computer. That would then eliminate the emulator and ECU.

I did have major noise issues when I first put the emulator on and programmed it via a USB cable with the car running. Im told USB cables are very prone to noise and when I programmed the emulator with the car off it sorted the problem. MSD ignition wouldnt help for noise but no live tuning for me.
kiwivetten is offline   Reply With Quote
Old 09-13-2017, 04:20 PM   #5
kiwivetten
Junior Member
Thread Starter
 
Member Since: Dec 2009
Location: Christchurch Canterbury
Posts: 29
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by HAD2HAV2 View Post
Check your TPS sensor. I had similar problems like yours on another GM vehicle. The TPS did not throw a code but was faulty never the less.
Yep it could be the tps sensor, Ill try the new ECU first as I have one and this will be my next step
kiwivetten is offline   Reply With Quote
Old 09-13-2017, 05:18 PM   #6
aklim
CF Senior Member
 
aklim's Avatar
 
Member Since: Jul 2004
Location: Hartford WI
Posts: 10,818
Thanked 427 Times in 421 Posts
Default

Did they program a higher idle or at least one to match the cam?
aklim is offline   Reply With Quote
Old 09-13-2017, 09:48 PM   #7
kiwivetten
Junior Member
Thread Starter
 
Member Since: Dec 2009
Location: Christchurch Canterbury
Posts: 29
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by aklim View Post
Did they program a higher idle or at least one to match the cam?
Stock cam, I just reprogrammed injector flow rate for larger injectors. Note it was running fine for a couple of years and this is a problem that has developed.
kiwivetten is offline   Reply With Quote
Old 09-13-2017, 09:50 PM   #8
aklim
CF Senior Member
 
aklim's Avatar
 
Member Since: Jul 2004
Location: Hartford WI
Posts: 10,818
Thanked 427 Times in 421 Posts
Default

Quote:
Originally Posted by kiwivetten View Post
Stock cam, I just reprogrammed injector flow rate for larger injectors. Note it was running fine for a couple of years and this is a problem that has developed.
Have you checked what the IAC count is with everything but the motor off?
aklim is offline   Reply With Quote
Old 09-14-2017, 02:11 AM   #9
kiwivetten
Junior Member
Thread Starter
 
Member Since: Dec 2009
Location: Christchurch Canterbury
Posts: 29
Thanked 0 Times in 0 Posts
Default

Hi Jim

I found a post as per your comments "fix to Moates Ostrich issues on '90 and newer"

Very similar to my problem and Ive just shortened up my ostrich ribbon cable which was quite long.

Ran the car for 10 minutes or so with no issues. Ill give it some time and report back. Now to post my next thread which is quite different if any of you can help!
kiwivetten is offline   Reply With Quote
Go Back   CorvetteForum - Chevrolet Corvette Forum Discussion >
Reload this Page
  • 1990 corvette random stalling issue
  •  
     
    Reply

    Related Topics
    Thread Thread Starter Forum Replies Last Post
    stalling at idle and also when going 60 mph holtan C4 Tech/Performance 6 05-10-2017 04:36 PM
    Make My 1990 Corvette Great Again: YUGE Red1990VT C4 Tech/Performance 1 07-24-2016 07:39 PM
    1990 Corvette Engine stalls at 3500 rpm ShadeTreeJW C4 Tech/Performance 11 04-30-2016 11:58 PM
    1990 corvette idle dropping away randomly kiwivetten C4 Tech/Performance 0 03-31-2016 04:58 AM
    1982 corvette random stall help cody82vette C3 Tech/Performance 4 01-07-2016 03:18 AM


    Thread Tools Search this Thread
    Search this Thread:

    Click for Advanced Search

    Posting Rules
    You may not post new threads
    You may not post replies
    You may not post attachments
    You may not edit your posts

    BB code is On
    Smilies are On
    [IMG] code is On
    HTML code is Off
    Trackbacks are Off
    Pingbacks are Off
    Refbacks are Off

    Forum Jump


    All times are GMT -4. The time now is 03:40 PM.


     
    • Ask a Question
      Get answers from community experts
    Question Title:
    Description:
    Your question will be posted in: