Question about 2005 GMC Sierra

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My timing belt snapped and bent all of my valves, ive got new valves groung in and the engine is now running spot on, for some reason the engine management light is on and stays on when the engines running. any ideas y?

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It sounds like maybe a sensor has been left unplugged, but to be fair any engine work can make them come on, it might be worth running it for 500 or so miles see if it goes off, if not you may have to get it on the daignostic machine. I wouldnt worry about it though modern cars are just made to tempt us into paying the dealer.


Posted on Nov 08, 2010


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Jumped time

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and my silly ASR33, printing terminal, caps only, flash ! im there....
misfires on all 6 cylinders. if patient,.
what car? what engine? what year?
1150 AFR bad.
1346 VVT says, cam is bouncing like MAD (DEVIATIONS) bank1
1349 VVT frozen, means it can change it ,but how could it if it bounces. bank 1
1351 VVT Sensor Range/Performance Problem (Bank 2)

here is my guess , your engine is????
2.5,3.0,3.3,3.4,4.0lilter engines,

new belt ,why old one snapped or shredded? or worse slipped?
my guess, bad belt setup, not timed right. or bad tensioner. bad idlers, or
or bad VVT parts, or bent head valves.

the V6 may be interference, and TOY dont say, but Gates lists most 96 and newer as Interference...engines.
i will assume it is (this is 1st deal with me, as im ,FIRST do no HARM"
and these engines , what do i do?
i do a leakdown test, just after the belt is replaced and tensioned, turning engine by hand.
if the leak down test FAILS the belt snapped and the valves did hit.
this i do everytime, it takes me, what 30 more minutes?
this act prevents further damage to head and pistons and rod bearing.
the damage can cascade fast to needing a new engine. now..
IMO, good luck.

Jan 02, 2014 | Toyota Cars & Trucks

2 Answers

Timing belt broke while driving will there be more damage ? it's a 1990 ford escort lx hatchback

All really depends how fast you was going when it snapped, the best thing to do is try turning the engine over slowly by hand to see if it moves freely and nothing is banging or knocking, if that is successful then you can try and just put a new belt on and see if it fires up and runs smooth,, but to be honest the chances of doing internal damage is imminent, could be cracked head bent valves ect but i would try the belt first before you start dismantling anything
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My timing belt snapped and I took it to a mechanic. he said that the belt snap the piston head and the bent the valves. I am wanting second opinion, and would like to know if the timing belt is connected...

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Timing belt snapped

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They are telling me i have a bent valve after replacing timing belt, i have a horriable roar sound and vibration. 3rd timing belt on this car being a female i am not trusting this solution w/o some other...

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1 Answer

Timeing belt snapped

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1 Answer

Snapped cambelt

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