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10-26-2010, 07:03 AM
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#1 | |
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AF Newbie
Join Date: Jan 2009
Location: prior lake, Minnesota
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94 ciera 3.1 wont start warm
hi everyone. I am working on a 94 ciera with 3.1 . it will start and run great then after driving it 15 min or more it wont start. it will sputter. i had an extra module and coil pack so i put it on and it ran fine for a while. now its bad again. it seems to be a yellow spark when it wont start.
i plan on doing fuel pressure test today. but the HOT/COLD thing puzzles me.. thanks in advance for any help..................87Racer |
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10-26-2010, 08:30 AM
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#2 | |
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A990 racer
 Join Date: Mar 2002
Location: Chestertown, New York
Posts: 17,051
Thanks: 26
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Re: 94 ciera 3.1 wont start warm
Could be the icm or a bad crank sensor, see if it starts with starting fluid, the spark should be sharp and blue of course.
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10-26-2010, 10:06 AM
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#3 | ||
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AF Newbie
Join Date: Sep 2010
Location: st louis, Missouri
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Re: 94 ciera 3.1 wont start warm
Quote:
Ithink your 94 is OBD1 but needs a reader tool to get the 5 diget codes. Some people call this OBD 1 1/2 ! I got the loaner tool from O'Riles to read the codes for my 95. After you drive it for 15 minutes does it die first then not restart? |
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10-26-2010, 11:09 AM
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#4 | |
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AF Newbie
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Join Date: Jan 2009
Location: prior lake, Minnesota
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Re: 94 ciera 3.1 wont start warm
sorry i forgot to mention. there isnt an MIL light on. i will recheck to see if any codes set. it doesnt kill it just doesnt want to start when warm and if it does it seems to spark knock alot. i sprayed starting fluid in it but i didnt get the reaction i was looking for. seemed to help some but not much at all...........THANKS!!!
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10-26-2010, 11:10 AM
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#5 | |
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AF Newbie
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Re: 94 ciera 3.1 wont start warm
is there a test for the crank sensor?? i did change the icm with a used one>>>
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10-26-2010, 11:22 AM
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#6 | |
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A990 racer
Join Date: Mar 2002
Location: Chestertown, New York
Posts: 17,051
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Re: 94 ciera 3.1 wont start warm
A scanner would show if the pcm sees cranking rpms, if not that points to a crank sensor. AZ/ Napa can test the icm but of course this only shows up warm.
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10-26-2010, 11:35 AM
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#7 | ||
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AF Newbie
Join Date: Sep 2010
Location: st louis, Missouri
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Re: 94 ciera 3.1 wont start warm
Quote:
That is a 2 wire sensor! Crankshaft position sensor 3x. http://easyautodiagnostics.com/crank..._sensors_3.php If your going to take the icm in for testing , then would be a good time to also remove the wire going to the sensor to inspect it for burning or melting of its instulation . |
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10-26-2010, 08:01 PM
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#8 | ||
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A990 racer
Join Date: Mar 2002
Location: Chestertown, New York
Posts: 17,051
Thanks: 26
Thanked 383 Times in 374 Posts
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Re: 94 ciera 3.1 wont start warm
Quote:
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