94 chevy k1500 running issues

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sydney

1998 K1500 5.7 moving misfire

Unread post by sydney » Sat Dec 18, 2010 9:16 pm

Misfire starts in cylinders 5 and 7. Moves to cylinder 6 then 4, 3 sometimes others with acceleration then almost dissappears at higher rpm. 172K new plugs and wires only code is 300

 

Meccboy

Re: 1998 K1500 5.7 moving misfire

Unread post by Meccboy » Tue Dec 21, 2010 9:36 pm

Sounds like possibly fuel injector problem. May be debre in the system. Try an injector cleaning service. Or a bad tank of gas.

only1spyderman
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Joined: Thu Sep 19, 2013 10:16 am

99 running rough until i hit 2000 rpms

Unread post by only1spyderman » Thu Sep 19, 2013 10:18 am

I have a 1999 silverado, 4.3 2wd. the truck runs rough til i get to 2000 rpms. any ideas on what would cause this? thanks

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carriedi
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Re: 99 running rough until i hit 2000 rpms

Unread post by carriedi » Fri Sep 20, 2013 12:45 am

any codes stored in memory? Freeze frame? have you looked for misfires with a scanner? What are your fuel trims? how's your fuel pressure regulator? check it for a leak to vacuum?
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ddiamonds
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94 chevy k1500 running issues

Unread post by ddiamonds » Wed Mar 12, 2014 8:02 pm

got a mechanical question for you, got a 94 chevy k1500 with a 5.7 v8 with throttle body injection, boggs down at stops and when accelerating basically anytime there is a load on the engine, fine when in park or neutral, replaced spark plugs, wires, coil, air and fuel filter, oil change, and idle air control valve. still does it not as bad but still does it, there is no cat to get clogged but the muffler does have a hole in it

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carriedi
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Location: Oregon

Re: 94 chevy k1500 running issues

Unread post by carriedi » Wed Mar 12, 2014 10:24 pm

you might want to check your EGR valve operation. it works on two things at once, vacuum and exhaust backpressure. The vacuum part may be working correctly but the backpressure may be opening up the EGR because the spring is weak. Try driving it with the EGR vacuum line off and plugged. If it seems to be gone, replace the EGR valve. If you do need an EGR valve get one from the dealer or an AC Delco one. I have found that some aftermarket valves don't work correctly for these 90's vehicles.
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