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116 Posts
Today, I pulled my sleeves and opened the hood
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. Pulled IAC, it wasn't clogged but there was some carbon in it, clenaed it nicely and set it aside.
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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.
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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.
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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.
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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.
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Started driving, that was the moment
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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
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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...
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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
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...
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....
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
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....
