Teamnix
Van Nuys, CA
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Another possibility is the egr system. Some systems rely on exhaust backpressure to operate correctly. The new headers may have reduced the backpressure causing the egr to work incorrectly. Not enough egr will cause pinging.
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enblethen
Moses Lake, WA USA
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Could be fuel starvation.
When was the last time the fuel filter was changed?
You may need to adjust fuel pressure regulator.
Bud
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RockwoodMike
Visalia,Ca
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when I installed banks on my 95 ford with the 460,before I started it up after install,I called up banks about a possible lean condition now that all this free flowing air was now installed on the engine...He said that the computer would need about 400 miles to relearn itself for the proper air\fuel mixture...you now have more air and not enuf fuel..But the computer will know after a bit of time and readjust itself..Its the same way if you have a carb set up..usally you have to jet up a size or two to compinsate for the more air..Make sure that your timing is right though...
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twoup1200
Magnolia, Tx, USA
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wow lots of suggestions. There is no vacuum advance. I guess it's all computer controlled. I had to disconnect one wire at the dist to check the timing. I think I'll try premium fuel first. Now about this knock sensor. How does it sense knocking. I guess it retards the timing when it does sense knocking???
Fuel filter is old and that could cause a lean mix. Hard to believe that it was OK on Friday and plugged on Sunday. I need to change it anyway though.
I really hope that the last suggestion works. Doing nothing while the computer resets....I can do that...
Thanks, you guys are great.
2up
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RJgonfshin
Winston Or, USA
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Joined: 06/08/2003
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I'd still bet it's a ringing problem. Can't believe any of you haven't heard of it. I can't make a link work here, but below is just one of several that explain it better than I can.
Rich
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20-2004, 01:09 PM #6
ArKay99
CF Senior Member
Member Since: Sep 2003
Mahwah
NJ
My Corvette Photos
---------------------------------------------------------------------Headers will give you more torque and power, but, the amount of performance increase is due to the extra scavanging effect they produce on the cylinders. If you are running a stock exhaust that will really limit the effectiveness of the headers.
Another possible cause is that headers can cause knock retard. Due to the nature of headers they are not as thick-walled as stock exhaust manifolds and will allow more noise to be transmitted. This noise can be heard almost as a ping or the sound of a ball-peen hammer lightly tapping the headers. This is from the exhaust gas banging out pf the head into the header tube. Another cause of this ringing is the AIR fitting on the driver's side. I have seen that touching the header and when the car gets going it vibrates against the header and the knock sensors pick that up as knock. You can have your car logged to see if it is pulling timing due to knock retard. Mine has pulled as much as 15 degrees of timing. And it was from a loose hanger bracket I couldn't hear, but the knock sensors did.
As stated above, just because you add something that should give you more power, you may not get it. Sometimes adding something introduces a problem that must be solved to realize the gains that should be there.
Having said ALL that, I would advise you to get the car tuned by a good tuner and before that, go over the whole car and make sure everything is torqued properly, exhaust hangars are tight, nothing is rattling or has the potential to rattle, etc.
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Kenneth
Washington, the state
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1) Check again for an exhaust leak. It can sound a lot like pinging.
2) Contact Thorley. http://www.thorleyheaders.com/contact.html
Ken
I'm free of prostate cancer for 5 years now.
All men over age 50 should get an annual PSA blood test. Mine had a low reading, but the yearly jump was significant. The biopsy showed cancer just entering the aggressive stage. Dr. Hackenslash removed it.
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Highbeam
Buckley, Washington
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"The "knock sensor" should respond way before you can ever hear a pinging. You might have a bad one."
This is not true. Even on my 98, the knock sensor is not capable of eliminating pinging. Supposedly some is normal. Just don't be disturbed if an occasional light ping is heard.
The first thing to do is disconnect the battery and leave it unplugged overnight. THis is to reset the computer so that itt starts gathering new info based on the headers. Otherwise the engine references old info gathered from before.
Contact Thorley, surely you are not the first 454 owner to put headers on and they likely know just what to do.
Last resort is pull a little timing and see what happens. It is free and if you know enough to use the thorley headers then you no doubt like a little tinkering.
Lastly, the headers will make more noise. Even the best headers are thinner than the cast iron manifolds and will allow noise through. Sounds like a ring/tick. A nice sound more pronounced at low rpm under load or at idle.
1998 Chevy ECSB, K1500, 5.7 V8, AM trans temp and vacuum gauges. Scangauge. HD light harness with 4hi. Timbren overloads. 168,000 miles.
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hud3ma
N. Cen. PA via Ware, Herts, England, UK
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Quote:Supposedly some is normal. Just don't be disturbed if an occasional light ping is heard.
My oldest son works for Sun Oil in fuels research and has said, more than once, that the engine designers in Detroit are very happy when they hear light pinging under load because it assures them they had the fuel/air ratio right where they need it to be.
Of course, I know that their science is probably a bit more sophistocated than that, but I've long been puzzled about why US engineers insist on using less-than-efficient, antiquated combustion chamber designs that ping and rattle rather than re-design them for improved efficiency and drivability?
Mike & Karen
...and Ziggy, the Golden Retriever
2002 THOR (Dutchmen) 25' Class C w/slide
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Clubmaxx
St Cloud, MN
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Banks is right on the computer. I would not do anything until the computer has time to make adjustments. You can disconnect it and let it set as suggested but I would let the computer do it on its own. A light pinging is not going to hurt you for a few hundred miles. Adding anything to the fuel or adjustments may just mask what the computer needs to see to fix it. Your knock sensor will take care of it after it has relearned the settings. Changing your timing on a TBI will do nothing right now anyway but cause the computer to rethink things again only to have to relearn again and it may take even longer for it to go away. Leave it alone and drive it a few hundred miles first. after a tank of gas or so then see if it is still there (I'd bet not). Then start making corrective measures. Anything you do until the computer knows what it is doing is only confusing the issue.
Good luck!
'84 Titan 36' 454, Thorleys, Monroes, Bilstein Steering stabilizer, and 16-months of rebuilding inside and out. Check out the whole rebuild project HERE.
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4runnerguy
Glenwood Springs, CO
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Lots of good suggestions here, especially about running a tank of premium to see if that stops the pinging. But I've had headers on a number of cars and trucks, and one of the most difficult things to do is to get them tightened down properly. Some engine/header combos take an amazing amount of torque to seal properly. And in some cases, you may need to try a different gasket.
Ken & Allison
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1996 4Runner, TRD Supercharger, Edelbrock headers
2007 Fleetwood Arcadia, Honda EU2000i
4 mountain bikes, 1 canoe, 4 tents, 8 sleeping bags, 2 backpacks
(You get the idea!)
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