Last post on Aug 14, 2013 at 9:55 PM
You are in the Chevrolet S-10 & GMC S15 Sonoma
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Chevrolet S-10, GMC S-15, GMC Sonoma, Engine, Truck
May 03, 2008 (10:53 pm)
My dad parked his 02 Sonoma after it ran fine. Tried to crank it that night, and it would turn over but refused to crank. Today I checked with a spark tester and we were getting the light on when the plug would fire, but it seemed somewhat dim (maybe just me, can't recall how bright it should be). Checked fuel pump...had good pressure. Chjecked fuel filter and seemed clogged/restrictive. Bought another one, still won't crank. Checked exhaust...no problems there.
Crazy thing is while it's turning over, it seems every now and then to 'bog' like something's mechanically holding the crankshaft back.....then releases and bogs again. Even with my Ranger next to it running with jumper cables keeping his battery up. We finally tried cranking it so much that smoke rolled out of the starter motor.
My question is.....is it the starter doing all this, or did we maybe burn the starter up due to an underlying problem? We took Serp belt off and checked all pulleys and turned motor over with just the crank being turned and it still bogs. Anyone got any ideas?............it'll be Monday or so before he gets the new starter. I just wonder what it could be if it still won't crank. Thanks. ?
May 05, 2008 (5:24 am)
Pressure is right at 60psi. Strange, everything checks out......yet when it's turning over periodically it stops for a sec, then turns over repeatedly again. I can't figure out what's causing the occassional snag. We removed the serpentine and tried and got the same thing. All other pulleys were like new. Crank and starter going it alone and still something acted like it was trying to stop it. I'm kinda lost on this deal........
#94 of 319 got everything except fuel.
May 05, 2008 (5:54 pm)
I have tried for about 4 weeks to get my 1991 sonoma 2.5 going. I lent it to a friend who ran it out of gas. It 's fuel injected so I was not happy to hear that this happened. I have pulled the distributor changed the ignition module, throttle position sensor, O 2 sensor, fuel injector, checked all fuel lines. The only thing left is the fuel pump which is only 1 year old I just put it in. Can it lose pressure from being run out of gas? I put more than 1/2 a tank in to make sure that was not the problem. And if some one pours gas on the fuel injector it will run long enough to burn the gas they pour on it. Help I am at my wits end. And out of money!!!!!!!!
#95 of 319 Any other suggestions???????
May 06, 2008 (5:39 pm)
Any more ideas?..............Anyone?...........I'm lost too
#96 of 319 Re: Any other suggestions??????? [nighthawk5556]
May 07, 2008 (7:36 am)
You already proved it's a fuel problem. Do you hear the pump run for 2 seconds with key on run?
Try to start it and at the same time have some one hit the bottom of the tank below the fuel pump with a mallet or piece of 2X4, see if it starts.
May 07, 2008 (2:59 pm)
Mine isn't a fuel problem, lol. I posted before the one about the loss of fuel pressure. Then when I asked for other ideas I ended up under someone else's post...................................... Don't know what kinda problem I got
#98 of 319 Re: Mixed up...... [nighthawk5556]
May 08, 2008 (7:51 am)
Ya, clicked on the wrong one.
#99 of 319 Re: 2002 GMC Sonoma 4.3L [nighthawk5556]
May 09, 2008 (2:09 pm)
Interesting story, 1st thing to remember is to never jump start a car that has a computer or several computers that operate different systems, the proper way to jump start a comp controlled car is to disconnect the pos/neg cables,then charge the battery, preferably with a trickle charger if the battery is really low (checked with a volt/ohm meter first). The biggest problem with jump starting is that $en$ative and expen$ive electronic systems don't really like to get hit with a voltage spike. As for the starter the maximum time it should spin is about 15 seconds with a 3 to 5 minute cool down time between each cycle, the cycle time is variable as it depends on ambient/radiated temperature (heatsoak). Spark can be tested with GM tool ST-125 (looks like a spark plug with an alligator clip attached) blue spark=good, yellow=weak ignition, as for checking the ignition system follow in this order : plugs, plug wires, distributor cap, rotor, igntion module, coil. Hope this helps.
#100 of 319 Re: Mixed up...... [gonogo]
May 09, 2008 (2:19 pm)
oops! refer to forest gump, it happens.
#101 of 319 Re: got everything except fuel. [dunc2]
May 09, 2008 (3:05 pm)
The possible reason the truck wouldn't start after your friend (?) ran it dry was because the fuel lines had air in them, back in the day we called that ' vapor lock' , try bleeding the air from the fuel line, the shop does this at the point where the fuel inlet line connects to the pressure regulator fuel rail assembly, or where the fuel line connects to the throttle body, this can be accomplished by using a vacuum pump (snap-on tools # YA 4000A, or equivalent). caution a flash fire can result if you try and loosen line while engine is cranked, wrong way to bleed air.