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Discussion Starter #1
Today, I pulled my sleeves and opened the hood
. Pulled IAC, it wasn't clogged but there was some carbon in it, clenaed it nicely and set it aside.


Then, uninstalled throttle body. It was pretty easy to pull it, since I cleaned it before winter (didn't uninstall that time) very few carbon deposits on back side of the plate. Cleaned it and set it aside in engine compartment.


Then I approached to infamous EGR, I did my best but I couldn't loosen the rusty nut to pull it once and good. Those little 2 screws were pretty easy.
Didn't want to mess with it and left it alone.


Looked at upper intake manifolt, it was very clean there was no carbon at all. But I have been injecting water lately. I did 2 seperate jobs, each one I injected 18 oz warm water into upper intake monifolt over 10 minutes high rev idling. Got little white smoke and some water came from tail pipe. That might be the reason that there was no carbon.


Since, air filter housing was out, I cleaned MAF sensor too. Reset the computer and I drove back to gas station. My tank was empty and put some 87 octane gas, not the full tank.


Started driving, that was the moment
I cursed loudly. The Vulcan was PINGING again.

Went back to gas station and filled the tank with 93. I guess this is what I'll be using from now on


WHen I was in engine compartment, I realized that DPFE sensor was in metal housing, I thought Gen4 has plastic DPFE housing. Could it be the reason...


I applied some vacum to EGR when car was idling, valve opened and it was holding the vacum cause I got shaky idling the engine was about to stall.

So now I am suspecting either selonoid or DPFE sensorl. May be system can't generate enough vacum to invoke EGR valve
...

This is usually what happens, you drive and trany lock into 4th gear and rpm goes donw to 1500-1800 which is normal. If I push gas pedal the car starts pinging. I hought EGR circulates exhaust gas once the car reaches 2000 rpm.
Is this correct?

Guys, I need some more troubleshooting methods. How can I effectively pinpoint the problem....
 

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If the EGR isn't working you will get a MIL light that sets a code.
 

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When my '93 was pinging I was convinced for the longest time that it was EGR related. But alas, after doing every possible test and even replacing some parts (PFE sensor, which actually did go bad at one point, and EGR solenoid) I concluded the EGR system was working properly, and I'll bet yours is too.
 

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Discussion Starter #6
Kermit: No, I was injecting it when it is idling on the drive way but the engine was hot (after highway driving)

Diesel: How did you resolve your pinging. My last resort will be 180 Degree t-stat. If it doesn't change anyhting, then I just keep pumping 93...
 

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You guys should try a colder spark plug if you cannot get the pinging under control on 87 octane.
 

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I'd go with Shoz...start troubleshooting your ignition...start with your plugs. My DPFE sensor has been shot for a few months on my duratec, In fact i replaced it with one from a vulcan yesterday(same sensor) However I never had pinging issues. I dont think lack of fuel delivery would cause pinging...specially sence it depends on what octan you use. IMHO I think its in your ignition system, check your plugs. Also I know moisture in the exuast and intake will mess up the DPFE sensor...so you may want to keep an eye for the check engine light...if it comes on its most likley moisture got into the sensor...
 

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Discussion Starter #9
Now, I have Autolite 764 Copper plugs in it. Didn't make any difference.
My car has no driveablity issue aother than pinging. Everything is smooth, idling CEL...
 

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Are the Autolite 764 a colder heat range than the OEMs?
 

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FullDuplex--I have the same exact problem as you have with engine pinging. I have tried everything imaginable to correct the problem and nothing has worked....except Chevron 89 octane fuel. That is only a couple dollars more per tank at fill up compared to 87 octane and a hell of a lot cheeper than replacing the DPFE sensor, egr valve, IAC, plugs/gaskets, or to clean parts XY&Z. (All of which I have done, to no avail). Guess I should have just kept running 89 instead of listening to the advice of some "master mechanics."
 

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my egr valve just went on my gen4 and it has been running ruff
egr valves dont cost a hole lot there only $56 so I'm just going to reaplace it
 

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Originally posted by FullDuplex@Mar 1 2004, 08:59 AM
Diesel: How did you resolve your pinging. My last resort will be 180 Degree t-stat. If it doesn't change anyhting, then I just keep pumping 93...
I was never able to completely resolve the pinging, I got rid of the car before I tried colder plugs or t-stats, but those would have been my next try. Someone had previously retarded the ignition to solve the problem. This works but it will also rob you of power. I just ran 89 octane, which took care of the pinging in all but a few situations
 
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