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Automotive Repair Car Troubleshooting Topics   Car Troubleshooting   Engine Troubleshooting   Engine Fault Codes   Electrical and Wiring   Transmission Problems Car Repair Topics   Car Making Noises   Car Stereo Repair   Heating or AC Issues   Motorcycles and ATVs   Tricks of the Trade   Truck Repair Advice Site Options:      Login   Sign up here! Latest Forum Post   1989 toyota pickup 3.0 crank no start I have a 1989 toyota pickup 3.0 crank no...   Strut spring orientation and strut mount tension nut 2017 Nissan rogue awd 2.5 L Put in Monro...   Transmission stuck in part, I have tried everything So I'm working on my elderly fathers 201...   2017 dodge journey LED headlights on/off randomly Year of vehicle 2017 Make of vehicle dod...   Kia Soul starter replacement issues! Okay so my car is a 2010 Kia soul 2.0 en...   Please Help - Knock sound & engine fail Hi all, Hoping to get some insight and ...   multiple warning lights 2013 GMC Terrain 130,000 miles 4 cylinde...   03 alero no low speed blower Good day everyone, I have a 2003 Olds a...   04 Chevy 2500hd tail light issues Help!!! I have changed my combo switch...   1999 Grand Caravan Sport not starting. Hi. I'm new here. I hope someone can hel...

Engine pinging Sign up here! Search this forum this category all forums for All words Any words Whole Phrase (search options) Auto Repair Home>> Automotive Repair>> Engine Troubleshooting Eric of Pa. Novice Nov 16, 2006, 1:31 PM Post #1 of 3 (2264 views) Engine pinging Sign In My 95 Surburban likes to ping when under load at certain rpms.Whats the cause and cure for that? Thanks DanD Veteran / Moderator Nov 16, 2006, 7:15 PM Post #2 of 3 (2255 views) Re: Engine pinging Sign In The first thing I would check is whether the base ignition timing was set to spec? Next would be to check that the EGR were functioning properly. The EGR (exhaust gas recirculation) valve when functioning cools the combustion temperatures and was designed to reduced NOx emissions but a side benefit was a reduction in engine pinging. If those were adjusted and doing what was intended I would try having the engine decarbonized ; sometimes carbon build up will raise compression ratios and cause detonation that audibly sounds just like a ping. What grade of fuel is recommended for this truck and what fuel are you using? The last thing would be engine mechanical as in a loose timing chain. A loose timing chain will retard valve timing and if someone unknowingly adjusted ignition timing to spec with a loose chain that would cause a ping. The distributor is driven by the camshaft and the cam is driven by the timing chain so it’s kind of a domino affect. Just a bunch of things that can cause an engine ping; who’s doing what to who is at times a process of elimination. Dan. Canadian "EH" steve01832 Veteran Nov 19, 2006, 3:59 AM Post #3 of 3 (2246 views) Re: Engine pinging Sign In I would like to ad one more thing. Remove the EGR Valve and look at the underside. You will see the pintle and probably see blackish carbon around it. If you take a small piece of coat hanger, you can try to push the pintle in. You shouldn't feel any resistance as the pintle is forced off of its seat. If you do, hold the pintle in and spray carb. cleaner inside and clean all of the carbon out until the movement is smooth. You can even insert the correct size torx bit and turn the pintle back and forth to remove the carbon as you clean it. This can cause the EGR to hang closed as the PCM commands it open. This usually kicks the MIL and stores a DTC but not always. I have found this buildup to be common on these vehicles and this cleaning procedure has proven to be effective when I retrieve an incorrect EGR position code. But like I said, this doesn't always kick the MIL and store a code. Also, check the spark plugs for carbon buildup, proper gap, and most important, proper heat range. Running too hot of a spark plug or too wide of a plug gap will also increase combustion temps. Steve   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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