
15 Dec 2020, 09:04 am
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Obsessed Cruiser
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Join Date: Oct 2013
Location: Arkansas
Posts: 10,764
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Re: Excess Pre-ignition in My '05 GT
Quote:
Originally Posted by pdbrains
You need to get a scanner that can read your ignition timing and see if there is any LT knock retard going on. Maybe knock sensor is not working. I would take a look at you spark plugs and see how they are running. Maybe your lean or running too hot.
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This and Steve's advice are very good.
If I had no trouble codes indicating the problem, I'd start with Steve's advise and try an additive to remove carbon build up. I wouldn't try the "water method" because that has been known to crack valves in some engines. A good additive in the fuel and/or directly into the throttle body via a vacuum port might do the job. I would try to some HEAT additive as well in case there is water in your tank. To be exact, my normal first step to engine miss-fires and pinging is often a bottle of heat and a bottle of cheap red-bottle STP fuel treatment. That often solve a contaminated fuel issue.
If that didn't work, a shop-level OBDII scanner would be the way to go. With that, you can look at the air/fuel ratio, knock sensor and timing, and the PCM's attempts to adjust them. A timing issue might be a functional but weak crankshaft sensor and/or the leads going to it. Fuel issues might be a weak fuel injector or a weak or clogged fuel pump making the engine run too lean under load. If you have no codes, a weak or clogged fuel pump is likely the highest probably. Shop-levels scanners are pretty expensive and usually not needed for most DIY work except in scenarios like this. So an hour of time at a good shop might be in order.
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Last edited by Handy_Cruiser; 15 Dec 2020 at 09:58 am.
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