Troubleshooting stalling after EGR delete
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From: ID
Troubleshooting stalling after EGR delete
Can I have some suggestions on why I have a rough idle and engine feels like it intermittently wants to stall when I am driving down the the road? I was told that I need to replace the engine control chip with one that has the EGR programmed out of it. Also where is the best place to purchase that new chip
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From: ID
1996 5.0 EFI , not sure if its the HD series. I was told that it was the only model that has the mustang engine. I removed the pump, charcoal can, and assembly on the back of the engine. Plugged all the holes and vacuum lines. Also I replaced the MAF.
Last edited by jonathandunlap1990; Jul 7, 2020 at 02:08 PM. Reason: Left out info
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From: south louisiana
You didn't delete the EGR then. You got rid of the Thermactor Air injection system. The EGR (Exhaust Gas Recirculation) feeds exhaust gases from the center passage of the intake manifold into the spacer between the throttle body and upper intake into the intake tract. And you do not have a Mustang 5.0, it's close to it, but there are a few differences such as pistons (yours are not forgings) and the camshaft. Then there's the upper and lower intake too, and the iron exhaust manifolds
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I had a friend tell me I should not have plugged off the vacuum lines but I should have T'd them into other lines. I have already checked to see if I had leaks and found none
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I connected three vacuum lines. Yellow, orange, and green. No change. As I was driving, the truck stalled and I could smell gas. Thoughts?
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Can you confirm what you remove was the EGR? EGR systems do not use pumps; those are for the AIR injection system, which usually feed the heads through tubes going in at the back. An EGR system operating at the wrong time can stall the engine. If you actually removed the EGR valve, did you plug up the holes it left, in addition to its vacuum lines?
If you also removed the carbon canister, that's probably the cause of the gas smell. It's supposed to trap fuel vapors from the gas tank, and through a valve controlled by the computer to be sucked into the intake at certain conditions. Now that it's gone, whenever the fuel tank vapor pressure increases, it will simply vent out, and that's probably what you're smelling. It means at least one set of tubes are leaking.
If you also removed the carbon canister, that's probably the cause of the gas smell. It's supposed to trap fuel vapors from the gas tank, and through a valve controlled by the computer to be sucked into the intake at certain conditions. Now that it's gone, whenever the fuel tank vapor pressure increases, it will simply vent out, and that's probably what you're smelling. It means at least one set of tubes are leaking.
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Yes I plugged the holes on the back. And the charcoal canister is removed. I am very positive that I removed only the EGR. However I referenced you tube and several friends who are savvy with vehicles. I wish I had a better way to show you what was removed.
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From: south louisiana
EGR doesn't have a pump or tubes. That tubing at the read of the engine bolted to the heads is the Thermactor crossover tube. You removed the Thermactor Air injection system. Only way to remove the EGR on your motor is to remove the throttle body and plug the hole behind it leading into the upper intake.
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You don't need to, the EGR system has none of the parts you described removing. There's just the EGR valve on an F series 5.0, the plumbing's in the intake manifold. The EGR valve is sandwiched between the throttle body and the upper intake. The Thermactor injection system pumps air into the exhaust ports in the heads, that's why you're thinking it's the EGR system
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I forgot to mention that the holes left by removing the EGR valve is in the EGR plate, usually installed between the throttle body and the upper intake plenum.
It's also very easy to disable the EGR without removing it. Just disconnect the connectors going to the solenoids that control its vacuum valves. Or disconnect and plug the vacuum line that goes to the EGR valve itself.
It's also very easy to disable the EGR without removing it. Just disconnect the connectors going to the solenoids that control its vacuum valves. Or disconnect and plug the vacuum line that goes to the EGR valve itself.