Detonation under load? - Mustang Evolution

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Old 08-10-2014, 07:36 PM   #1
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Detonation under load?

I've had my car for about a year now, it's a 2002 gt with a 5 speed, now has about 80k on it.

When I first got it this wasn't a problem but now if I'm going about 40mph and put it into 5th I hear some detonation. Once I reach about 50mph it's gone. So it's pinging at low rpm's.

What can be causing this? I changed my plugs and my fuel filter, I was going to do injectors next but I read they're good for 150k and I'm way under. And I did already try running cleaner in my fuel.


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Old 08-10-2014, 07:45 PM   #2
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Have you checked your timing?


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Old 08-10-2014, 07:55 PM   #3
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I thought about doing that. But the thing is, I shouldn't have to. There has to be something else going on because it was running just fine before.


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Old 08-10-2014, 08:03 PM   #4
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If you figure it out let me know. Mine is detonating also at low rpm's. I'm thinking fuel pumps going bad. I've been told that could be the problem also, so who knows. Good luck...


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Old 08-10-2014, 09:22 PM   #5
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I've been reading a bit about this problem.
You are right, if it was running without detonation before, something must have changed.
I'd start looking at everything "air delivery" related and begin with cleaning and inspecting the Mass Airflow sensor.
Also, check the air intake for leaks and all of the vacuum hoses and the intake manifold for vacuum leaks. Dont forget to clean or replace the PCV valve and inspect the grommet and hose for leaks.
After all of the air related things are checked. You'll want to turn your attention to the fuel delivery system and run a fuel pressure test.

Something is "tricking" the computer to make the engine run lean. Check all of the" free" stuff first...
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Old 08-11-2014, 08:23 AM   #6
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Detonation under load at about the same speed as you was one of the symptoms I had when I had a weak COP. No codes thrown but I could feel a miss at those speeds as well. Accelerating made the miss/ping disappear.

I found it by data logging with my SCT.
If you have a code reader that detects pending codes you might be able to see them there.

Just a thought if the usual suspects don't solve the problem.
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Old 08-12-2014, 07:44 AM   #7
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Shortly after the pinging began I replaced my intake with a Cai, in the process I cleaned everything, I will defintley check vacuum lines


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Old 08-12-2014, 01:13 PM   #8
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That's the whole problem IMO. It could be so many different things. If you bring it to a mechanic and they start throwing parts at it.. It will expensive fast. If you have limited savings, then it will prolly eat through that pretty fast.


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