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1996 GMC Sierra P300 Random Misfire


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BadBackyardMechanic
User

Feb 18, 2013, 10:54 AM

Post #26 of 30 (1195 views)
Re: 1996 GMC Sierra P300 Random Misfire Sign In

since this original post was made...

replaced the fuel pump and assembly (but couldn't really test drive it...the tranny was on the verge of totally shot)

had my transmission rebuilt by southern gear, replaced yoke and 2 U joints.

replaced my rotors, flex lines, and calipers (on the first day of test driving i noticed some smoking and the lugnuts were extremely hot)

and now it's driving beautifully. i haven't had this truck running this well for a few years.


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Feb 18, 2013, 7:17 PM

Post #27 of 30 (1183 views)
Re: 1996 GMC Sierra P300 Random Misfire Sign In

OK - Some smoke from brand new brakes for a few miles might be excused but the lug nuts hot to the touch is not normal unless you were really working them hard. By any chance in replacing flex hoses did you twist them up in putting calipers back on? They must be back in correct position or will fail if wrong. Check on that if any chance of that,

T



nickwarner
Veteran / Moderator
nickwarner profile image

Feb 18, 2013, 9:48 PM

Post #28 of 30 (1172 views)
Re: 1996 GMC Sierra P300 Random Misfire Sign In

I'm wondering about sticking calipers along with a chance the hoses got twisted up during install. Or wheel bearings going out. At the age of the truck all is up for grabs.


BadBackyardMechanic
User

Feb 24, 2013, 4:57 PM

Post #29 of 30 (1151 views)
Re: 1996 GMC Sierra P300 Random Misfire Sign In

the flex lines going to the calipers went bad. i'd replaced the calipers before but it never really got the problem fixed. i left my truck with my brother when i took a new job on the other side of the state 2 years ago.

i didn't know that the flex lines where what was causing the calipers to seize in the first place.

the truck sitting on and off for most of 2 years didn't help any.

i drove it after installing the rebuilt transmission and the fuel pump and assembly. that is when i realized i had a caliper issue still when i noticed the brakepads were still not releasing well.

THEN i replaced the flex lines, the calipers, the wheel bearings, and rotors.

as of right now, it's driving fairly well and the lugnuts are staying cool.

the flex lines that i'd had on the vehicle did not look damaged. what i'd been told is that they often collapse internally but you can't see the damage from the outside. just comes with age and use.


nickwarner
Veteran / Moderator
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Feb 24, 2013, 5:13 PM

Post #30 of 30 (1146 views)
Re: 1996 GMC Sierra P300 Random Misfire Sign In

Yes, that is what happens. If you ever get a brake hanging up again, crack the bleeder screw and see if the wheel frees up. A caliper piston that is sticking does so when pressure is off of it, so it won't release. A bad flex hose holds that pressure, so allowing the pressure to release through the bleeder gets the wheel spinning again. Easy test to find the issue and glad to see you got it solved.






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