Car throttle body closing at WOT and backfire
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Junior Member
Joined: Mar 2023
Posts: 8
If you increased your engine's rpm and held it there, the vacuum will quickly drop some and go right back up. It sounds like your exhaust is clear.
I do not think you have a misfire. If that happened long enough, a code would be set . A misfire on a four banger would result in a very rough, shuddering engine.
I would be curious as to what your fuel trims are at to actually see how the engine is performing.
Also you might want to test your air pump's check valve. They can cause a backfire when you back off the throttle.
https://www.rockauto.com/en/moreinfo...vmMfS8ANlMpp8g
I do not think you have a misfire. If that happened long enough, a code would be set . A misfire on a four banger would result in a very rough, shuddering engine.
I would be curious as to what your fuel trims are at to actually see how the engine is performing.
Also you might want to test your air pump's check valve. They can cause a backfire when you back off the throttle.
https://www.rockauto.com/en/moreinfo...vmMfS8ANlMpp8g
Test:
https://imgur.com/a/J0QQMqR
Here are all my fuel trims:
https://imgur.com/a/PpNEKtU
Nothing in particular is out of the ordinary there, the trims just flucate between +- 4-5% and is pretty steady.
Where exactly is my air pump located?
Thread Starter
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Junior Member
Joined: Mar 2023
Posts: 8
When you changed the spark plugs did you do one at a time or all at once?
Air coming from the AIR pump usually goes to the exhaust manifold only or is diverted out of the system. Should not be noticed or felt at the intake or throttle body, but anything is possible until we determine why you are feeling puffs at the throttle body AND the exhaust. This engine does have a dual overhead cam system with a timing chain.
Variable valve timing could be involved here too. 76,000 mi is not a lot of miles, unless regular oil changes were not done to which the VVT system becomes susceptible to excessive wear and clogging problems.which may or may not throw any codes.
Air coming from the AIR pump usually goes to the exhaust manifold only or is diverted out of the system. Should not be noticed or felt at the intake or throttle body, but anything is possible until we determine why you are feeling puffs at the throttle body AND the exhaust. This engine does have a dual overhead cam system with a timing chain.
Variable valve timing could be involved here too. 76,000 mi is not a lot of miles, unless regular oil changes were not done to which the VVT system becomes susceptible to excessive wear and clogging problems.which may or may not throw any codes.
Thread Starter
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Junior Member
Joined: Mar 2023
Posts: 8
Also you may have noticed I didn't send the puffing noise...that's because it's not even happening now lol. All I did today was pull the plugs to recheck the vaccum (which came back the same and check the spark (what was also normal)
And the car ran fine at WOT. It's super inconsistent
One other thing I forgot to mention is that along
with the fuel pump, ford mentioned was that my fuel feed line had pinhole leaks in them? I didn't change that as I only went by what my local mechanic said who didn't say anything about it and just said my fuel pump needed to be changed.
Like here's the invoice of its any help:
https://imgur.com/a/IFILkB8
And the car ran fine at WOT. It's super inconsistent
One other thing I forgot to mention is that along
with the fuel pump, ford mentioned was that my fuel feed line had pinhole leaks in them? I didn't change that as I only went by what my local mechanic said who didn't say anything about it and just said my fuel pump needed to be changed.
Like here's the invoice of its any help:
https://imgur.com/a/IFILkB8
Last edited by sarxworks; Mar 10, 2023 at 12:23 PM.
Senior Member
Joined: Jun 2010
Posts: 16,662
Why I asked about replacing the plugs all at the same time or one at a time is MANY times guys get wires crossed and be it either coils or plug wires , either of which can produce what you were seeing.
Glad all is well , thanks for the update.
Glad all is well , thanks for the update.
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