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Temperary cut out at speed and P0300

tfelton

By tfelton
in Ask A GM Technician

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tfelton New Member

tfelton

Posted
Posted

I have a 98 GMC K-1500 Sierra Ext. Cab with a 5.7 Liter Vortec engine 210000 miles. Compleatly STOCK

 

I have changed the injection spider with the new version from the dealer.

I have replaced the fuel pump about 4 times in the last 2-3 years, changed the fuel pump connector. I have a vibrating fuel gauge and have had from before the first fuel pump. Resently replaced the intake gasket. New distributer, cap, rotor, wires, pluges. Changed the Thottle position Sensor, Camshaft sensor, Crankshaft sensor, 2 new cats, 4 new 02 sensors...I may have forgotten a thing or two like fuel filter everyother month or so and air filters.

 

I have 2 problems or mayby they are related.

 

Problem 1: truck runs fine but Check engine flashes at about 2200 RPM. P0300

 

Problem 2: Intermittent cut out of power. Does not seem to happen in 3th gear.

When this happens it causes an immedate decellaration for about 1 second, then its back. Sometimes it just continues until I eather take my foot off the gas or floor board it. It is such an abupt loss of power that it causes the gears in my transfer case to clash harshly.

 

I have been fighting with the P0300 for quite a while, but this cutting out thing has got me scared. I almost think the fuel pump is going out AGAIN.

 

What do you suggest I do? I want to take it to the dealer but I do not want them sucking money that I dont have out of me. And, I dont think they will find the problem. I have read some of the post with simaler problems and they take there truck to the dealer with no resolution.

 

Pease help, I be your friend forever.

 

Thanks,

 

Ty Felton

 

P.S. Cant believe I am going to say this: But this is making me want to buy a $%^ing Ford. Please forgive me.

GM-Tech Senior Enthusiast

GM-Tech

Posted
Posted

This one definitely needs to go on a scanner that can capture what's going on when the problem occurs. You replaced practically everything, so I have no other ideas at this point.

 

A flashing SES light means you have a potential catalyst damaging misfire. Driving with a scanner so you can monitor misfire data may narrow it down to one specific cylinder. Knowing that would help a lot.

 

The other problem, loss of power, may or may not be related. It doesn't sound like it is, but I could be wrong.

 

Sorry, I have no other suggestions without more diagnostic info.

95Sierra2500 Senior Enthusiast

95Sierra2500

Posted
Posted

this sounds alot like what happened with my fiancee`'s '99 Jimmy shortly after I got it. I fought that same code for MONTHS (obviously you've been going longer) and it ended up that the cap & rotor were bad (even after I replaced them). Apparently these trucks do not like anything but AC Delco parts. Also, the catalytic converter was on its way out, but didn't totaly fail for another year.

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