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I am going to assume you have checked compression, do you know for sure the cylinders are getting fuel from the injectors, and spark at the plugs ?

Posted on Dec 10, 2012


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SOURCE: 1994 gmc sierra 1/2 ton 350

Replace the pickup coil in the distributor,this pulsates the injectors.

Posted on Apr 14, 2010

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1998 ford escort sport engine started making a tapping noise and engine light started flashing. Had oil and water at normal level.
Car has 110,000 miles. Been serviced regularly!

Posted on Mar 30, 2011

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2006 GMC Sierra 2500 series replaced throttle body sensor and fuel pump getting fire and gas but will not start

Do you have spark at the spark plugs ? Also are there any lights lit on the instrument cluster , check engine , SECURITY ? What throttle body sensor did you replace ? TPS -throttle position sensor ! What engine does yours have because there are a few options for this vehicle , 4.3 , 4.8 , 5.3 , 6.0 L !

Apr 12, 2015 | GMC Cars & Trucks

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Engine diagram

u have a fuel delivery issue may need new fuel pump or fuel filter

Jul 23, 2014 | 1990 GMC Sierra

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1996 GMC Sierra Pickup Truck 4x4 Strong fuel pressure up to the trottle body, wires and pluges new fuel filter. Truns over like a champ, but want start.

Do you know for a fact the injectors have power and a ground signal from the ecm ?
And are you getting spark to the plugs ?

Sep 05, 2012 | GMC Sierra Cars & Trucks

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2004 GMC Denali - hard starting, mechanic replaced fuel pump, still haveing problems.

did he replace the fuel filter at the same time, try that first , and be sure your timing is set correctly and that your plugs are getting good spark

Jul 13, 2011 | 2004 GMC Sierra Denali

1 Answer

My 98 gmc 1500 wont start its getting fuel and spark and air . after i take the key out the fuel pump is still running for a min or two i just put a new fuel filter in.

If your fuel pump is continuing to run with the ignition turned off, there is something terribly wrong. I don't even know where to tell you to start without seeing the vehicle myself. If it is getting fuel and spark, the only thing left to keep it from running is compression. I would recommend having a professional take a look at it. This just doesn't sound right.

Feb 22, 2011 | 1998 GMC Sierra

1 Answer

Just had a new fuel pump, fuel filter, spark plugs and coil pack put in, was getting 27miles to the gal, now I am getting 15!!!

possible problem is that you did not put ac delco plugs in the vehicle and now you are getting bad gas mileage.gmc vehicles only require that you put ac delco spark plugs any other type and you get bad gas mileage or poor performance

Feb 12, 2011 | 2003 Oldsmobile Alero

1 Answer

I have a 2002 GMC Sierra, 71,500 mi. I used to start on a couple of turns of the engine, now its 3 times as long, it seems that its only a matter of time that it might not start!! by the way I just...

How long has it been since the spark plugs were changed? Sounds like a good tuneup is in order. New spark plugs(try the new E3 plugs, expensive, but worthit), Air filter, fuel filter, injector cleaner in gas tank.

Dec 29, 2010 | 2002 GMC Safari

1 Answer

1996 gmc sierra, have changed fuel pump and fuel filter. can smell plenty of gas coming out of exhaust pipe. tested for spark, have spark.. truck will crank but not start. what can i try or check now?

Check the timing and make sure the battery is good, the battery can sometime have the power to crank the engine but have internal problems that leave it without enough voltage to give you a hot enough spark to start the engine.
You could also have some bad ignition parts which could be shorting out your spark or sending it to the wrong spark plugs. Plus you could also have fouled spark plugs.

Jun 25, 2010 | 2000 GMC New Sierra 1500

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