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P Codes diagnostics and Probable Causes

 
Old 06-10-2018, 07:13 PM
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2000 4.6L I have a P1450 code. Evap canister vent solenoid holds vacuum well but does not release vacuum when power is removed. Is that normal or is that my problem? The solenoid seems to cycle open and closed normally when not under vacuum.

Thanks!

Last edited by moto.troy; 06-10-2018 at 07:26 PM.
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Old 12-04-2018, 09:17 AM
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Default P1408

Can the p1408 code cause the truck to shake at idle and at speed (at around 50 ish)? I'm also having significant power loss like from the 2-3 shift and 3-OD I'm having to stomp on the gas to get the rpms up in order to shift. I was thinking these could be related.
Truck - 1997 F150 5.4L 4x4 AT
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Old 12-04-2018, 10:41 AM
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Originally Posted by Erick_ View Post
Can the p1408 code cause the truck to shake at idle and at speed (at around 50 ish)? I'm also having significant power loss like from the 2-3 shift and 3-OD I'm having to stomp on the gas to get the rpms up in order to shift. I was thinking these could be related.
Truck - 1997 F150 5.4L 4x4 AT
Seriously doubt it. That's EVR flow, the PCM would have to be wacked or possessed. Easy enough to check, just pull the green line and leave it off. That tests the 1408 against a drivablity concern.

However, given your description, you could very well have an EGR "valve" problem. The easiest/cheapest way to confirm is to temporarily block the port into the TB elbow. Just loosen the EGR valve, enough to slide a thin piece of sheet metal between the valve and TB elbow port. You do that and there's know possible way the EGR system can affect the way the engine run. If the problem goes away, then yes, it's the EGR. It's a big shortcut lol .
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Old 12-04-2018, 10:54 AM
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Originally Posted by Jbrew View Post
Seriously doubt it. That's EVR flow, the PCM would have to be wacked or possessed. Easy enough to check, just pull the green line and leave it off. That tests the 1408 against a drivablity concern.

However, given your description, you could very well have an EGR "valve" problem. The easiest/cheapest way to confirm is to temporarily block the port into the TB elbow. Just loosen the EGR valve, enough to slide a thin piece of sheet metal between the valve and TB elbow port. You do that and there's know possible way the EGR system can affect the way the engine run. If the problem goes away, then yes, it's the EGR. It's a big shortcut lol .
Thanks, will do 👍
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