Help with egr codes
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Tuned
Joined: Sep 2015
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Ignore the Egr, I've never had one on my fords that worked and I block em all off anyway, nothin but a headache to me, and it really doesn't offer as much benefit as people think. What's the truck were working on? I'd test the IAC and the Tps first and take it from there and work your way across all of them. Does it only stall when driving it and gassing it? Or all the time
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Tuned
Joined: Sep 2015
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Not exactly sure what pinging sounds like but i havent noticed any strange sounds or anything since ive owned it...
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Tuned
Joined: Sep 2015
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--Fixed!!-- Alright i found out the TPS was bad, so now it idles and drives like before. But im still stuck with the rough idle.... Any thoughts?
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Tuned
Joined: Sep 2015
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Can anyone tell me where i should start?
Fleet Owner
Joined: Oct 2005
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From: Kentucky
Glad to see you found it. My money was on an IAC issue but we have to cover all the bases. All part of the diagnosis process.
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Tuned
Joined: Sep 2015
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All are basically brand new. The only thing i was thinking of was maybe check the gap on the sparkplugs. Air filter i just cleaned and fuel filter is brand new. And yeah im very releaved it was just the tps lol
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Tuned
Joined: Sep 2015
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So after reading around. I found that my truck is suposed to idle at about 500-750 rpm but it idles at about 850-900. I supose that is because of the egr delete situation?
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Fleet Owner
Joined: Oct 2005
Posts: 20,785
Likes: 1,751
From: Kentucky
No, not necessarily. If done correctly eliminating the EGR has zero effect on the idle RPM. If done wrong there may be an open vacuum line.
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Tuned
Joined: Sep 2015
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Yeah as far back i remember its always idled at about 900 rpm. Where should i check for vacuum lines? Any vacuum lines ive ever seen disconected i have check to see if the mess with engine in any way shape or form... But where should i start?
Fleet Owner
Joined: Oct 2005
Posts: 20,785
Likes: 1,751
From: Kentucky
Make sure all of the disconnected emission items that rely on vacuum are capped off. Inspect all throttlebody, intake manifold gaskets for signs of leaks. Spraying carb. cleaner tends to yield poor results. A recent post here on the subject stated they used a home made smoke machine. It revealed the intake manifold had numerous leaks that did pass the spray test but failed the smoke.
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Tuned
Joined: Sep 2015
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Make sure all of the disconnected emission items that rely on vacuum are capped off. Inspect all throttlebody, intake manifold gaskets for signs of leaks. Spraying carb. cleaner tends to yield poor results. A recent post here on the subject stated they used a home made smoke machine. It revealed the intake manifold had numerous leaks that did pass the spray test but failed the smoke.
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Tuned
Joined: Sep 2015
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So i checked and i didnt see any vacuum lines that werent plugged, except for one but i stopped it with my finged and nothing happened. Just curious. Could this be a bad pcv valve? Maybe it is stuck closed??? Ive never understood how the pcv valve worked until two google searches ago... What do u think?
Fleet Owner
Joined: Oct 2005
Posts: 20,785
Likes: 1,751
From: Kentucky
So i checked and i didnt see any vacuum lines that werent plugged, except for one but i stopped it with my finged and nothing happened. Just curious. Could this be a bad pcv valve? Maybe it is stuck closed??? Ive never understood how the pcv valve worked until two google searches ago... What do u think?
Your symptoms are not indicative of a stuck or plugged PCV.
Another simple test. Unplug and cap off every vacuum port on engine except one port. Run a temporary line to the MAP sensor. Start the truck, see if the idle RPM returns to normal. If it does your issue is external to the engine. If not your issue is on the engine.
These 4.9L engines are known for hidden vacuum leaks on that long intake manifold. Also never discount those aged vinyl vacuum lines. Small cracks along the length of them contribute to vacuum leaks. As a preventative measure I suggest you replace them.
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Tuned
Joined: Sep 2015
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When you put your finger on the open port did you feel vacuum? If so, cap it off.
Your symptoms are not indicative of a stuck or plugged PCV.
Another simple test. Unplug and cap off every vacuum port on engine except one port. Run a temporary line to the MAP sensor. Start the truck, see if the idle RPM returns to normal. If it does your issue is external to the engine. If not your issue is on the engine.
These 4.9L engines are known for hidden vacuum leaks on that long intake manifold. Also never discount those aged vinyl vacuum lines. Small cracks along the length of them contribute to vacuum leaks. As a preventative measure I suggest you replace them.
Your symptoms are not indicative of a stuck or plugged PCV.
Another simple test. Unplug and cap off every vacuum port on engine except one port. Run a temporary line to the MAP sensor. Start the truck, see if the idle RPM returns to normal. If it does your issue is external to the engine. If not your issue is on the engine.
These 4.9L engines are known for hidden vacuum leaks on that long intake manifold. Also never discount those aged vinyl vacuum lines. Small cracks along the length of them contribute to vacuum leaks. As a preventative measure I suggest you replace them.