1991 GMC Suburban

1991 GMC SUBURBAN
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BIGBLUEGMC
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Electrical problem
1991 GMC Suburban V8 Four Wheel Drive Automatic

HEY MY 2500 GMC SUBURBAN WONT RUN RIGHT HERE'S THE DEAL IT CUT OFF ON ME WHEN I LEFT THE GAS STATION IT WOULDN'T TURN OVER NOR SWITCH ON NO DASH LIGHTS NO WINDOW OR DOOR LOCK POWER SO I TOWED IT HOME ABOUT 2 DAYS LATER IT STARTED UP I DIDNT DRIVE ITI LET IN RAN FOR ABOUT 30 MINS THEN TURNED IF OFF AND I TRIED TO START IT BACK UP BUT IT WOULDNT FIRE UP IT ACT LIKED IT WANTED TO START SO I WAITED A COUPLE OF DAYS LATER AND IT STARTED UP AGAIN I DIDNT DRIVE IT STILL BUT WHEN I GAVE IT GAS WHILE IN PARK THE ENGINE AND BRAKE LIGHT CAME ON AND WENT OFF EVERYTIME I TOOK MY FOOT OFF THE GAS PLEASE HELP ME ONE PERSON SAID IT MIGHT BE A SENSOR IF ANY BODY HAVE ANY CLUES I'M ALL EARS THANKS
Dec 26, 2009 at 9:51 PM
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JDL
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Welcome, how long since a tune-up? Gasoline engine? Make sure the battery has a full charge and the connections are good. After reading the first part of your post, I'd check the feed to and from the ignition switch. The second part says it cranks ok but, won't start? Have a helper crank it, while you check for spark at the plugs. If you have spark everywhere, use a gage and check fuel pressure. Also, check for any possible codes. You place jumper wire between the A & B terminals of the data link connector, turn key till dash lites come on, no further. The mil starts flashing, you count the flashes to get the codes. Your looking for two digit codes.


https://www.2carpros.com/forum/automotive_pictures/170934_obd_1_datalink_connector_1.jpg

Dec 27, 2009 at 10:13 AM
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BIGBLUEGMC
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I RECENTLY HAD A TUNE UP AND YES ITS A GAS ENGINE, ALSO THE BATTERY IS BRAND NEW CONNECTIONS ARE GREAT I PUT A NEW IGNITION SWITCH IN ITS CRANKS AND STARTS BUT WHEN IT RUNS FOR A WHILE AND I TURN IT OFF AND TRY TO START IT BACK UP IT WONT START
Dec 28, 2009 at 4:33 PM
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JDL
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Yes, I understand, when it refuses to start, find out what your missing. Check for spark at the plugs. Check fuel pressure. Check for possible trouble codes. All I an do is suggest what to test, you have to do the testing.
Dec 29, 2009 at 10:30 AM
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BIGBLUEGMC
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THANKS FOR THE ADVICE AND I TRIED ALOT THAT EVRYTHING SEEMS TO BE FINE BUT ITS STILL DOING THE SAME THING IM PUZZLED BEHIND IT IM GETTING SPARK THE FEUL PRESSURE IS CORRECT AND I HAD NO CODES
Jan 2, 2010 at 1:04 PM
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JDL
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I'd have to use a scanner, to see if live engine data showed anything? With no code diagnostics, the list of things to check, is about as long as your arm. Egr-- tps-- CTS-- check for restricted exhaust. Maybe a vacuum leak somewhere? Maybe some fuel trim info would suggest something?
Jan 2, 2010 at 3:07 PM