Question about 1998 GMC Sierra

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1989 gmc sierra turns over and does not crank

Fuel is going to the carb. could this be a ignition module problem

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Do you have a 5 volt signal to crank sensor and distributor i think its a crank sensor

Posted on Dec 24, 2008

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Fuel pump


Testing of the fuel and ignition systems is in order. Intermittent problems need testing when the problem is present, otherwise it won't help find the problem.
I would start by checking for spark on a spark plug wire (or two or three plug wires, in case it may be a bad coil), during those times when it won't start. You need to see a blue, snapping spark to verify ignition system is working.
To check the fuel system, have the fuel pressure checked, and the injector circuit checked. Good that you hear the pump, but you don't know if fuel pressure is correct, or if fuel is getting into the cylinders. One short test is to spray starting fluid or carb cleaner into the intake while engine is cranking. If engine fires up for a few seconds, you know it is a gas related problem.
If ignition system is the intermittent problem, could be failing coil or coils, ignition module, crank position sensor, even the computer, or a wiring problem like a bad connection. Testing of each component will be required, or you could start throwing new parts at it, like many people do, until you find the bad part. Find a reputable mechanic-there still are a few, lol.

Jul 30, 2013 | 1998 GMC Sierra

1 Answer

Put batt. in backwards by accident, replaced alt. and alt. hot wire as they were burnt up. but wont start, motor turns over but wont crank. could it have burnt up solenoid


check ignition module, you may have fried it, if motor turns over the solenoid is o.k. -- your probably not getting any fire to the plugs, check to see if you are getting any spark at plugs

Jan 08, 2012 | 1989 GMC Sierra

2 Answers

85 gmc sierra 350 will not start. replaced the


battery is very low I aqssume from trying to start it so many times. have the ignition module checked out
that maybe your problem if its very old. it is located inside the distributor

Feb 25, 2010 | GMC Sierra 1500 Cars & Trucks

1 Answer

I replaced the battery on my Sierra after a week of sitting and now it turns but wont crank. I checked the fuel line and gas is going to the carb. Any ideas?


try undoing the battery for a min undo the positive side and then put it back on that might take care of it..

Nov 07, 2009 | 1989 GMC Sierra

1 Answer

1979 sierra grande runs too righ even after adjusting carb


You may have an internal carb gasket leak or your floats may be adjusted too high.After you run the truck look into the carb to see if there is gas still dripping into the carb bore.Also after running with engine on remove the front fuel level check screw. (have lots of rags under to catch fuel) Fuel level should be right below hole.If it is spilling out it is too high.Floats need to be adjusted up for fuel level to go down.

Oct 27, 2009 | 1989 GMC Sierra

1 Answer

1989 GMC Sierra p/u gasoline V8 will not start. Cranks but no fuel from carb jets. Fuel pump is working. I put gas down the carb throats and it starts right up. The carb has two sensors over each jet,...


The Carb jets may be plugged try dry gas or so you fuel pump is working is the fuel filter plugged try checkin make sure you dont have any broken wires?

May 07, 2009 | 1998 GMC Sierra

1 Answer

No spark but turns over replaced ignition module,coil,ecm


could be in the crank position sensor

just a thought shack

Apr 18, 2009 | 1995 GMC Sierra

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