Question about 1997 GMC Sierra

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I have a GMC and I have replaced all the sensors

I have a 1997 GMC Sierra K 1500 5.7L and I have replaced the crank shaft positioning sensor, throttle positioning sensor, rotoe, plus, wires and also the ECM, fuel filter air cleaner, ect....it starts and runs but when you push the gas peddle to half or full throttle it bogs down really bad...do you have any idea what the problem might be?

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You may have a restriction in the exhaust, like a clogged catalytic. Converter. The mass air flow and the fuel pressure were good ideas too. lee

Posted on Oct 04, 2009

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My 1997 GMC Sierra truck, does not start. I have pressure in the fuel line and also sparks.


I'd get a can of easy start or equivalent and see if it runs then, if so and u say u got fuel pressure it can only be a couple of things really 1 crank position sensor cam position sensor rail pressure sensor if it has 1 or ecu fault

Feb 13, 2015 | 1997 GMC Sierra

1 Answer

How do i time the cam sencer witrh the crank sencer ?


your question is realy garbled but I think you are asking about the timing of the cam and the crank sensors usually you have to have them both replaced at same time which means you can see the NO1 position on the cam and the position of the crank and thats with the cover off but I found out from another friend that if you go onto YouTube and request How To set timing on the Cam shaft and Crank shaft sensors you will get a video. MAKE SURE YOU SPELL IT ALL RIGHT OTHERWISE YOU WILL NOT FIND IT. Sorry about the Caps but wanted your attention use my spelling. Good Luck

Jul 22, 2014 | 1997 GMC Sierra

1 Answer

97 gmc siera on cold days have to dump fuel into throttle body to start, runs fine after??


look into throttle body while cranking.see if you see fuel spray.if not, low fuel pressure of pluged fuel filter. also coolant temp or tps sensor could be at fault.have vehicle sensors scan tested for values..

Dec 25, 2012 | 1997 GMC Sierra

2 Answers

1998 GMC Sierra 2500 5.7L hard cold starts last month, now won't start cold w/o a little carb cleaner in intake. Codes for oxy sensors, mass air sensor and crank/cam position. Drove today, no power just...


starting definately has a lot to do with the crank/cam position sensors, but it wouldnt have nothing to do with hot or cold weather, oxygen sensor will make the vehicle run too rich if its out, you will smell fuel very strong out the exhaust, that could make it run sluggish also, and usually if the mass air flow sensor goes out the vehicle wont start at all...

Nov 27, 2010 | 1998 GMC Sierra

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Locting the throttle position sensor on a 2003 gmc yukon denali


The throttle position sensor is located on the throttle body. Which is in the front of the intake manifold.

Nov 29, 2009 | 2004 GMC Sierra Denali

5 Answers

Can Fuel pressure cause no spark in a 1997 GMC Sierra? I replaced the fuel pump. drove 30kms and it died. I have no spark. Any ideas for this?


Do you still have fuel pump pressure?Is there fuel getting to the cylinders?If all the fuses are good,then replace the crankshaft sensor.

Oct 17, 2009 | 1997 GMC Sierra

1 Answer

I have a 1997 Gmc Sierra 5.7 4x4. It has no spark. I replaced the coil and ign module today but still no spark. Tech suggested Crank shaft sensor? Truck was running then died going down road. (30kms after...


It could be the CPS, but as you now know throwing parts at a repair is costly and sometimes it does not fix anything. A code scanner should be able to tell you if the sensor is bad. If the CPS goes bad you will have no spark.

Oct 17, 2009 | 1997 GMC Sierra

2 Answers

OK 1997 gmc sierra 5.7liter 4x4 replaced coil and


Doesnt this engine use a crank position sensor? mounted on timing chain cover.I would check that first

Oct 17, 2009 | 1997 GMC Sierra

1 Answer

Tps switch


The Throttle Position Sensor is a potertionmeter, and is connected to the throttle shaft on the throttle body it self. The best way to notice it, is the wire harness coming from the Throttle body on one side where the shaft is.

Good luck and hope this help.

Apr 14, 2009 | 1994 GMC Sierra

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