Question about 1999 Pontiac Grand Am GT

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99 pontiac grand am 2.4 timing chain

Timing chain slipped is it an interference motor

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  • thomas tysiak May 25, 2009

    not sure havent taken it apart yet

  • Anonymous Mar 15, 2014

    Change timing chain on 1998 Pontiac 3800 motor

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  • Expert
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Yes, that model is an interference motor. Most of the pontiac grang am's and grand prix's are. Sorry, I'm sure that was the answer you didn't want to hear.

Posted on May 25, 2009

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  • Master
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Hi and NO it is not a spin free engine
how many teeth did it jump

Posted on May 25, 2009

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2001 pontiac grand am 2.4 car died no noise when i went to restart it sounded as if the chain broke the motor turned over freely would a bad chain that jumped time sound like this


Yes a broken chain could sound like and cause a 'no start' condition.

Unfortunately I believe this is what's called an 'interference' engine. In other words, if the chain slips or breaks it COULD cause the tops of the pistons to come into contact with the valves. Bending the valves and possibly causing piston or cylinder head damage.

Also if I'm not mistaken the water pump is also run off of the same chain. So IF you find the chain broke or slipped it may or may not have caused serious damage to other engine components. The water pump isn't a big deal but the valves, pistons, or cylinder head could add up real quick expense wise.

Being attempted starting has already occurred (which is understandable as that's the first reaction when a vehicle stalls) any damage that may have happened is already done. Now it's a matter of diagnosing to see how bad it is.

When attempting to start the engine it will turn over with a rather non-rhythmic sound if the chain broke or jumped time.

Sorry for the 'gloom and doom'. Simply trying to give a straightforward answer.

Sep 23, 2017 | Pontiac Grand Am Cars & Trucks

1 Answer

I would like to know If my 3.8l engine in my car has a non or interference engine in it


most newer vehicles are interference, basically if the timing chain or belt breaks it will cause internal engine damage. eg: bent valves, broken pulleys.

Apr 07, 2016 | 1999 Pontiac Grand Prix GT

3 Answers

Where is timing belt located on my 2002 Pontiac Grand Am


nowhere. it has a timing chain that should last forever as long as you keep your oil in good shape. doesn't matter if you have a 4 cylinder or a v6, they both use chains.

Jan 12, 2015 | 2002 Pontiac Grand Am

1 Answer

Grinding nose from timing cover and a tick from valve cover could that tick be chain slap or is the 2.4 a no tolarince motor


The Tick is more likely worn lifters and cam. The grinding noise is most likely the timing chain guide is worn out or broken. Possibly a bad timing chain Tensioner. That IS an interference engine.

Jan 27, 2012 | 1998 Pontiac Grand Am

1 Answer

My 17-year old son asserts that his '99 Sunbird (112K miles) broke down several days ago causing him to pull off the road - no additional details - after which he restarted the car and drove home. Next...


If the timing belt (chain ) broke or jumped the car would not have restarted after your son shut the engine off. (The motor would have stopped on it's own.) Timing belts are an issue with most modern cars and if the motor is what is referred to as an interference engine there will be valve damage. The other possibility is that some components from the butterfly valves in intake manifold were sucked into the cylinder head causing damage to the cylinders , pistons and valves. No matter what the cause its going to cost a lot to repair.

Jan 18, 2011 | 1999 Pontiac Sunfire

2 Answers

I need a manual or video on how to change a timing belt on a Pontiac Grand Prix 1999


This vehicle does not have a timing belt it has a timing chain.You can go to the library and get a book or if you want to buy one you can usually get one at any part stores for about 15 bucks.Hope this helps.Good luck.

Feb 04, 2010 | 1999 Pontiac Grand Prix

2 Answers

Need diagram 99 pontiac 2.4 timing chain. tapping noise under cover


If you are talking about 99 Pontiac Grand Am, I have the information you need with drawings. If you send me your email address I will send you the info you need. Outdoorsman592003@yahoo.com

Sep 09, 2009 | 1999 Pontiac Grand Am GT

1 Answer

Replace timing belt on 99 Pontiac Grand Am 2.4 L Twin Cam


This engine is chain drive. You shouldn't need to replace it unless it has a problem. Do you have a problem with it?

Jun 08, 2009 | 1999 Pontiac Grand Am GT

1 Answer

Car rondomly shuts off, and now will not start


The Timing chain is absolutely the Problem, with no Doubt.

Jan 24, 2009 | 1999 Pontiac Grand Am GT

2 Answers

2001 Suzuki Grand Vitara cranks but won't start


Most likely your timing chain.
This is a major problem 99 -05 V6 GV.
The Timing chain tensioner failed.
When the chain breaks it destroys the engine.
Unfortunately is an "Interference" engine.
This and the rear main seal are the big problems with these cars.

Dec 21, 2008 | 2001 Suzuki Grand Vitara

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