'90 won't start
Thread Starter
Navigator
Joined: Aug 2009
Posts: 9
Likes: 0
From: north syracuse ny
'90 won't start
I started my 'vette after letting it sit for 3 weeks. The engine light came on and it was idling rough. I drove about 1/2 mile, the light went off and it seemed to run better. I came to a light about 1 mile away and it stalled while waiting. After about 20 minutes it fired right up again. I drove home and it ran great. I turned it off and restarted it without hesitation. I did this a few times just to make sure it wasn't going to happen again. I went out to start it an hour later and nothing.
The plugs, wires, cap, rotor, and the fuel injectors were replaced less than 1000 miles ago. The fuel pump was replaced two years ago. I checked the fuel pressure at the rail just in case, and that was fine. Any ideas?
The plugs, wires, cap, rotor, and the fuel injectors were replaced less than 1000 miles ago. The fuel pump was replaced two years ago. I checked the fuel pressure at the rail just in case, and that was fine. Any ideas?
Burning Brakes
Joined: May 2011
Posts: 838
Likes: 2
From: Louisville Ky
sounds like ICM. module in the distr. no codes? you will need the codes, either learn to do it or have it done, but without the factory manual and codes it is a long, expensive process.
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Bend a paper clip and jumper the ALDL pins A&B (upper left), turn on ignition (don't start) and cound the SES flashes.
You will see "1 2" flashed three times, followed by each trouble code three times, finally the "1 2" will flash three times.
Come back with the code.
You will see "1 2" flashed three times, followed by each trouble code three times, finally the "1 2" will flash three times.
Come back with the code.
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
(I just did this in another thread...) Instructions for retrieving codes:
http://corvettephotographs.com/c4vettes/codes.htm
What they mean:
http://forums.corvetteforum.com/1576116036-post35.html
http://corvettephotographs.com/c4vettes/codes.htm
What they mean:
http://forums.corvetteforum.com/1576116036-post35.html
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Burning Brakes
Joined: May 2011
Posts: 838
Likes: 2
From: Louisville Ky
(I just did this in another thread...) Instructions for retrieving codes:
http://corvettephotographs.com/c4vettes/codes.htm
What they mean:
http://forums.corvetteforum.com/1576116036-post35.html
http://corvettephotographs.com/c4vettes/codes.htm
What they mean:
http://forums.corvetteforum.com/1576116036-post35.html
joe
Burning Brakes
Joined: May 2011
Posts: 838
Likes: 2
From: Louisville Ky
code 33 is MAP sensor, in the 91.. no 31, 35, 37 codes in 91 ECM, but are in the CCM.
if you were in section 4.0 using a-g, that is ecm. so, I don't know what your 90 codes are.
unplug the map sensor and see the reaction. if it runs ok, the sensor circuit is suspect.
if you cleared the codes, new codes will set, so you have to try it and check codes.
joe
Thread Starter
Navigator
Joined: Aug 2009
Posts: 9
Likes: 0
From: north syracuse ny
on a whim I decided to see if it would start today. it fired right up. the cooling fans came on immediately. the longer it ran the higher the rpm's got at idle. I turned it off and tried to restart it and all it would do is crank. I have bought a new coolant temperature sensor and will replace the old one. I will keep you posted on what happens next.