Putt or Poof every 1.5 seconds or so

**Pursell1911** · 03-20-2017

I have a 2006 GP GT with 174000 miles on it. About every 1.5 to 2 seconds or so, at idle, I notice my engine go from about 700 rpm to about 600 (rough guess). Then it goes right back up. When I'm standing behind the car, I can hear it either puff or poof at the same interval as stated above. I'm not sure if that's a misfire, because most of the videos i've seen regarding the exhaust putt putt, occur at a much faster rate than mine.

My CEL isn't flashing, and I don't notice anything wrong when I'm driving, the only time I notice is when the engine is idling. I'm going to check my plugs again, but could use some direction.

Thanks!

**Pursell1911** · 03-20-2017

http://www.youtube.com/watch?v=Iyru2DjoXow

**mguzzo** · 03-20-2017

Any number of reasons, Could be a slight misfire, not enough to trigger a MIL. might not even show up on a scanner.
Or simply the IAC doing its job.

whens the last time you checked plugs?

**Pursell1911** · 03-20-2017

I replaced plugs about two weeks ago, but I had a severely clogged cat, which was causing some weird clanking noises in the engine. I've since corrected the cat issue and the engine noises have stopped. When I replaced the plugs a few weeks ago, I noticed one plugs ground or whatever it's called, was bent, completely touching the electrode. I plan on checking the plugs sometime this evening to see if anything is wrong.

**mguzzo** · 03-20-2017

I think you were visited by Uncle Chip. Only one reason for an electrode to be bent down, the clanking noise was a piece of piston banging around in the cylinder until it broke up enough to get blasted out the exhaust valve.

**Pursell1911** · 03-20-2017

You are the second person who has mentioned that. Would the chip be a little piece of steel? Not saying you are wrong here, but I inspected the plug and it didn't look like something hit it with a big force. It was bent perfectly centered on the electrode. Not arguing, just trying to give all of the facts. Anyways, would that cause the occassional putt? It's not every 1.5 seconds either, it's intermittent.

**Scottydoggs** · 03-20-2017

meet chip, he also f's up your valves for ya too as it crunches on the chips. you can pick up a little cam that hooks your cell phone like a inspection cam, put in the plug hole to see just whats up.

**Pursell1911** · 03-21-2017

I'm interested in the camera so I can take a look inside. Just wondering, if there is a chipped piston, would I have seen the chip when I pulled the stock pipe with clogged cat?

**Scottydoggs** · 03-21-2017

not unless you got x ray vision, thats the top of the piston, only way to see it if you peek in through the plug hole with a cam. or take the head off.

you might even be able to do a free rental on a inspection cam at a parts store, you'd need to call a few stores.

when mine chipped, i knew something went bad when it happened, car pretty much fell on its face and made some really bad sounds then had a misfire code and it was running poorly. bent the plug out re gaped it and it ran, but not as smooth as it used to.

that cylinder also hardly held air pressure when i was taking the springs off too, air was just blowing out the exhaust valve. cause it ate the chip on the way out. all them little white pit marks are the chip bouncing around.

same for the head all dinged up.

**Pursell1911** · 03-21-2017

I gotcha, I saw another poster mention the chip can end up getting blown out through the exhaust which is why I asked about possibly being able to see it rattling around inside the cat when I took it off. Oh well, I just need to see if I can take a look inside. I believe removing the parts so I can get a view like your post above is a little bit above my expertise (:

**Scottydoggs** · 03-21-2017

you might see some little chunks, but i saw nothing come out my dp. i had my cat clamped on at the time, welded it during the engine swap.

compression test would also tell you if its hurt.

**Pursell1911** · 03-21-2017

OK, the compression test is something I should be capable of accomplishing. I'll just need to get a gauge and some time. Maybe this weekend. Currently, my car is running the best it ever has in the time I've owned it, which is 6 months.

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