Throttle body cleaning
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Throttle body cleaning
When I bought my RV (based on a 93 E-350), the throttle was sticky. I pulled the intake off, I could see decent amount of carbon buildup on the butterflies.
So I pulled the throttle body off (PITA!). The backsides were pretty gross.
I saw this sticker saying not to clean it, but after some debate decided that I was this far into it, I wasn't going to just put it back on and live with the stickiness.
So a can of TB cleaner and lots of scrubbing later...
and
Throttle was nice and smoooove after that. But it's been a couple thousand more miles since, and it's starting to feel sticky again.
I was told by someone that knows Fords that I should be using Marvel Mystery Oil in the fuel to help keep the TB clean. I'm not sure how that would work given that it's just carbon blowback that is sticking to the butterflies. I did run a couple tanks with it, but then opted to save my $ so I quit using it.
Should I have taken that advice to heart? Would that additive really have helped prevent this? Is this problem typical of this era 7.5L engine?
Any other advice before I pull that TB off again this summer for round 2 of cleaning?
So I pulled the throttle body off (PITA!). The backsides were pretty gross.
I saw this sticker saying not to clean it, but after some debate decided that I was this far into it, I wasn't going to just put it back on and live with the stickiness.
So a can of TB cleaner and lots of scrubbing later...
and
Throttle was nice and smoooove after that. But it's been a couple thousand more miles since, and it's starting to feel sticky again.
I was told by someone that knows Fords that I should be using Marvel Mystery Oil in the fuel to help keep the TB clean. I'm not sure how that would work given that it's just carbon blowback that is sticking to the butterflies. I did run a couple tanks with it, but then opted to save my $ so I quit using it.Should I have taken that advice to heart? Would that additive really have helped prevent this? Is this problem typical of this era 7.5L engine?
Any other advice before I pull that TB off again this summer for round 2 of cleaning?
Fleet Owner
Joined: Aug 2005
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From: Easton,Ks
They have coating on them that slows down the any buildup on them and if you clean them (taking the coating off) they will build up carbon very fast.
That is why you should never clean them.
The Computer (PCM) will compensate from normal build up.
Being sticky is the throttle shafts most of the time from not being used all the time.
I have found a little oil on the shafts works most of the time.
That is why you should never clean them.
The Computer (PCM) will compensate from normal build up.
Being sticky is the throttle shafts most of the time from not being used all the time.
I have found a little oil on the shafts works most of the time.
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Hrm. Ok, I'll just have to live with the consequences then... As far as oiling the shafts, can I use a penetrating spray lube from the outside of the TB or will I have to get to them from the inside? And is there a particular type of lube that works better?
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WD-40 has almost no lubricating properties. I'm surprised that works for you. I think most penetrating oils will attract dirt but that's on the exterior mainly; probably not much of a problem inside the bushings where it's really doing its work. I may try some Teflon- or silicone-based spray lube.
