No ping on start up, after operating temp, starts pinging, no codes present, or history codes, some say carbon,cat, converter semi clogged, vacuum leak., i have vac. guage, how much vac..should i get. any repair could be costly., got to try to pinpiont.
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The sensor helps to monitor the engine performace, and when it detects knock or pinging. It sends a signal to the PCM which in turn adjusts the timing and fuel ratio to reduce or eliminate it in those situations you have knocking. Low octane, bad gas, carbon deposits and heat will contribute to pinging. It's best to replace the sensor if you know it is faulty to avoid damage to the engine.
Pinging or detonation is caused by the spontaneous combustion in the chamber from incorrect air/fuel ratio and timing. It is most prevalent in lean mixtures under load. Run the fault codes and check for faulty HO2s and O2 sensors as they tell the ECM what mixture and timing is required to stop it
Yes, it is normal for a vehicles idle to be high when first starting up, no mater what the temp. If it`s already warmed up to operating temp, it will still have a high idle for a brief moment when starting. Usually this is the IAT (Intake Air Temperature) sensor. Located in the air duct down from the air filter, and before the throttle body.
Main proplems from IAT sensors are to low of an idle at normal temp, or the idle never comes down after warm up.
Your gas milage problems would stem from Oxygen sensors, plugs, wires, timing, etc...
Here is a quick test, just incase your OBD II (Computer, PCM..) memory module is not working properly. With the engine running, using the tips of your fingers, tap on the PCM, if the engine stumbles or stalls and sends troubles codes that light up your check engine light while tapping, if it does, check to make sure all wires are securely attached to it.
if it is overheating , ti will ping. do not drive like this. Low on coolant? why getting hot? or do you just mean at operating temp? If yes, your EGR valve is plugged or not opening. EGR reduces ping on warm engine by reburning exhasut gases.
When does this noise occur? During idle or acceleration? Is the vehicle warmed up? Is the check engine light on? Are there any codes stored in memory? Was anything done as a repair prior to the noise starting? How many miles is on the unit?
Also try cleaning out your air intake. Carbon buildup can cause rough idle and hesitation. Run two or three cans of throttle cleaner through it, clean out the pathways from the EGR to the intake, put two shots of the LUCAS brand fuel system cleaner in it or SEAFOAM.
If it improves then there you go. If not, you may have other issue, take it to a mechanic or have a gearhead friend take a look.
The OBD will tell ou if theres any engine codes going off caused by something wrong.
use the Carb cleaner/Intake cleaner by removing the the air intake hose to the air box, use one hand to increas the throttle whiile spraying the cleaner through it. Make sure to rev it enough to keep it from stalling, bu tnot too much.
If you start seeing smoke come out your tailpipe, then you have carbon buildup.
If unsure about any of this. I suggest you make friends with a guy or gal that knows about cars, buy em a six pack and ask them what they think about it, eventually they wont be able to stop themself from helping you.