Question about 1999 Chevrolet Lumina

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2000 olds van 3.4l engine started ticking Top end? Started suddenly last weekend. 220 000 klicks. timing belt slipped a tooth???

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Sounds to me maybe a sticky lifter and not building up with oil pressure,try adding 2 quarts of clean diesel fuel to your oil and let idle for about 10-15 minutes,if the ticking stops then change the oil and filter,then it was the lifter not building up with oil pressure

Posted on May 08, 2009

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When did you last change the timing belt? If the belt slipped a tooth it could cause your issue. I would do a compression test of all cylinders to see if they are good. Any major variation would indicate a possible timing belt slip. Be advised that this is an interference engine and if the belts breaks or slips too far, valve or piston damage can occur.

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Most probably... All these modern DOHC engines have interference designs that play havoc when belt fails... valves can collide with piston or between them too. To check without opening engine, you could remove timing belt cover and timing belt, and carefully rotate one cam to feel if it binds or not. But engine starting points to a jumped tooth on belt reinstallation (bent valves would not even allow engine to restart! Amclaussen.

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Just a thought that the belt could slip if the tensioner did not locate properly. Seems too coincidental that it is not related to the timing belt.

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basically the same as if you needed a tune up. backfires, sluggish,hard to start, won't start now power.etc. Of course it could be something else like plugs,wires,fuel filter,fuel pump,sensor,etc. Usually you end up replacing everything else and then you find out it is the timing belt/chain. You can always use a timing light to see if it is out of time, as sometimes if is slips you con adjust the distributor. Hope this helped Tim

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I don't want to be a prophet of doom but it sounds like the timing belt jumped a tooth. If it did the noise you heard would have been the valve touching the piston. If it went another tooth the engine will not start. You need to check the timing, correct it and try and start it. If it either locks up or won't start you probably have a bent valve.

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what happened sound very much like either you slipped a tooth on the timing belt/chain or the it broke. the first clue is the back fire, and then the no start. your going to have to take the cover off the timing chain to see if this is the case. i would imagine that if it isn't broke but it doesn't start then it slip the gear. if you have not done this kind of work then i suggest find a friend to help or take to a good shop

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check the timing belt,remove the oil cap.....if you, can look at the valve train to see if it's moving when some one turns the key.........if it's not possible to see through the oil cap opening you may have to remove the valve cover if the valve train isn't moving the timing belt is probably broken.
Keep Me Posted! I'll try to help more if that's not the problem.
Thanks for choosing FIX YA!

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