Car makes popping noise under WOT or heavy throttle (please help!)

JohnnyWash1 · Mar 1st, 2006, 11:36 AM

Of course.

JohnnyWash1 · Mar 1st, 2006, 04:51 PM

Quote:

Originally Posted by oliverr87

Did you set the car in timing mode?

There was some error with my last response--it is now the first post in this thread. Yes, I was in timing mode.

JohnnyWash1 · Mar 6th, 2006, 12:58 PM

Ok, so my car makes a popping sound while under heavy throttle. The sound is accompanied by a hesistation in the acceleration, and the noise appears to be coming out of my intake tubing. I have two videos to help identify the problem. You may have to turn your volume up; the popping isn't as loud as it is in person. If it matters, the car does this while driving and while free-revving.

http://www.we-todd-did-racing.com/we...EzZGZkMzF5NTQx

http://www.we-todd-did-racing.com/we...EzZGZkMzF5NTQx

If you have problems with the player, just click the Direct Download link below the video. Thank you everybody!

ghost_ryder35 · Mar 6th, 2006, 11:12 PM

does it affect performance at all? does your car have 200,000 plus miles on it? (no way related just thought thats what I saw on the guage cluster). Doesnt sound like a mis-fire, but if its coming from the intake tube thats gotta be bad. something in the engine might be bent. when was the last oil change? does it burn oil?

ghost_ryder35 · Mar 6th, 2006, 11:13 PM

is everything in the engine bay sitting firmly in its position?

JohnnyWash1 · Mar 7th, 2006, 01:47 AM

Quote:

Originally Posted by ghost_ryder35

does it affect performance at all? does your car have 200,000 plus miles on it? (no way related just thought thats what I saw on the guage cluster). Doesnt sound like a mis-fire, but if its coming from the intake tube thats gotta be bad. something in the engine might be bent. when was the last oil change? does it burn oil?

Yes, it affects performance. The car hesitates when it pops. My car has 230K on it. Last oil change was a few hundred miles ago, but I might change it again just to be sure. If it burns oil, it does so discretely.

ghost_ryder35 · Mar 7th, 2006, 05:15 AM

man i dont know what to tell you, i have never heard that sound before in my life. maybe something to do with the timing chain, or water pump.

JohnnyWash1 · Mar 7th, 2006, 06:07 AM

Yes, I am thinking timing is off, and that maybe I am getting pre-ignition. It does sound like it's coming from the manifold, though.

ghost_ryder35 · Mar 7th, 2006, 06:21 AM

do you have a timing gun? that would be a real easy way to check?

JohnnyWash1 · Mar 7th, 2006, 08:03 AM

I don't have a gun--I would have already checked it. I'm going to try and find time this week to look at the situation more closely. If it truly is pre ignition, then this next tank should solve that as I will switch to 92 octane and see what happens.

JohnnyWash1 · Mar 9th, 2006, 04:20 PM

Need some help, people. Please give some input.

ghost_ryder35 · Mar 9th, 2006, 11:11 PM

did you ever check the timing? wat happened when you ran higher octane?

JohnnyWash1 · Mar 11th, 2006, 02:17 AM

I'm putting the higher octane in tomorrow, and I haven't checked timing yet.

JRinke · Mar 11th, 2006, 02:32 AM

That sounds like a timing problem indeed. To fix it, just turn the timing to 10*, the factory setting. Or you can use colder spark plugs IF your problem is preignition. Do you have a perforance exhaust by any chance? I hear a lot of CRX's that sound like that......

JohnnyWash1 · Mar 15th, 2006, 02:58 AM

Ok, so I talked to a mechanic about my car and he agrees with you, Jrinke. He believes it is timing, but wonders if my distributor is broken. I really need a timing light to check the problem. I have a stock exhaust.