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1990 Corvette

Tiny
LRMANTE
  • MEMBER
  • 1990 CHEVROLET CORVETTE
I have a 1990 corvette with 104000 miles that starts up nicely. Its a V8 stick. But as soon as it is warmed up the engine starts to sputter and trys to stall. It stays running but with stalling tendencies. The plugs, distributor, ignition module and plug wires are new. I opened the air intake plenum to ensure it was not a clogged air filter. The fuel pump was replaced last year. I reseated the ECM connectors. There are no fault codes reported just 12. No check engine light either. The SYS indicator has been flashing for years but never of any consequence. I read that is probably due to contacts in the control panel making poor connections. Please advise
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Saturday, June 16th, 2007 AT 2:17 PM

6 Replies

Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
HAve you performed any carbon removal procedures yet?
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Saturday, June 16th, 2007 AT 6:55 PM
Tiny
LRMANTE
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  • 3 POSTS
Thank you for responding.

No I have not performed carbon removal procedures. This problem happened suddenly. I did buy a scan tool and checked the data. I find that the MAT and MAP are reading high. The vacuum hoses have all been replaced. I did replace the O2 sensor since its been 17 yrs. I have the shop manuals to go by and am now going to test the MAP sensor and wiring. Any other suggestions is appreciated.
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Wednesday, June 20th, 2007 AT 7:22 PM
Tiny
SERVICE WRITER
  • MECHANIC
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Is the 8th digit of the vin an "J"?
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Thursday, June 21st, 2007 AT 7:41 AM
Tiny
LRMANTE
  • MEMBER
  • 3 POSTS
No its an 8, it is not a ZR1.

LM
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Saturday, June 23rd, 2007 AT 7:23 PM
Tiny
STRAIGHT AHEAD
  • MEMBER
  • 41 POSTS
Best guess. Did you modify the wire loom in the car by adding a radio? Alarm system. Or by the previous owner? If you are showing a dash fault? That will tell me there is a link to your problem. The ECM is corrupt. It is a wiring problem. Next problem is exhaust system is clogged. By broken cats. Good Luck
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Sunday, July 22nd, 2007 AT 11:31 PM
Tiny
GWH
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  • 14 POSTS
Check your EGR valve for carbon?
GWH
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Wednesday, August 15th, 2007 AT 3:29 AM

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