Pontiac Problems? Ask a Mechanic for Answers ASAP
hello, was the "slapping" noise loud like if you were to knock two rocks together? have you checked the oil level and checked for any major external leaks? so far from what you explain it very much sounds to me like the crank or rod bearing had spun or broke or even a piston, but definitely internal engine damage, it would take a few things to try to eliminate the internals of the engine.
you have timing chains and they are rarely a issue, a tensioner could be a issue BUT it would not hinder the engine running
Sorry Sunday is a busy day and I didn't hear from you for 40 min. Ok so do you think it sounds and feels more like a misfire ? Does the check engine light flash? A bad today would only affect acceleration and when you accelerate quickly.
Ok I don't feel like we are on the same page you kinda keep bouncing around. Why don't you start from the beginning. What happened how did it sound , what did you do to fix it or try to fix it ? Does it happen when engine is running or does car have to drive ? As much info as possible. I'm good at helping but I need as much Info as possible.
Ok traci thanks is there a way you would be interested in a phone chat ? Let me know.
Ok no problem. So it sounds to me still like engine failure. So here's what to try first. Remove the serpentine belt and then try to start it and see if it makes the same noise or if it runs. If it makes the same noise with the belt off then we know it's engine related. If it does not then we know it's a belt driven item. Does this make sense ?
Ok so now that tells me the engine is the issue. From here you will need to do a compression test. You remove all the spark plugs and screw in a compression tester. Crank the engine with full throttle until you see the gauge move 6 times and write down the reading and do the next cylinder. All cylinders should be 120psi- 140psi.
Ok I'm not sure why you did not take my advice on doing a compression test. It's hard for anyone to help you if you do not follow our advice. I will have to opt out. Hopefully some one else can chime in and get you on the right path if we would have done a phone call we could have cleared this up already instead of wasting time and money on throwing parts at the car. So I will opt out. I wish you luck. Hope I'm wrong and it's not a engine and I wish you well this holiday season.
new expert here
I don't thins its a security issue.. Is the engine light on solid or flashing
can you tell me all the codes are in the system
I would complete the tune up, I don't think a compression test in needed.. I would replace the coils and plug wires.. Spark plugs alone rarely solve a missfire
I would check fuel pressure first