Difference in throttle body question

My 98 (3.4 5 speed) had some considerable play in the throttle bore and linkage. I picked up a clean used one that appears to be for an auto. I don’t think my dash pot has worked properly for some time. Should I run it without because I will have to as this throttle body is slightly different. Can’t put the dash pot from my old onto new. I know the dash pot slows the plate from slamming shut. What say tacomaworld?

 

I don't see why you can't run it with out. Try it see how it works. Are you positive it's the right throttle body and will work since it's from an auto?

 

well - on further inspection I would have to extend my throttle cable as well. The attachment on the very common tb for the auto is about 2” forward.

the max bore guy is sounding better and better the more I think about it.

 

So it's a completely differently tb? Why are you swapping them ? Are you trying to fix the problem or increase performance and gr a bigger bore tb? If you out the bigger bore on will the OEM ECU be able to adjust the tune or will it create more problems? Just a little future planning. Cheers

 

They must match, I was lucky enough to find an exact match for a used one while Maxbore was fixing my original. What are the numbers on the TB (auto) ? I might want it.

 

I replaced it because my throttle plate moved back and forth about an 1/8th of an inch towards the front of the pickup. I cleaned it a 2nd time and ICV as well, after a valve cover gasket job. Was chasing a high idle problem. Checked everything. TPS ok. ICV ok. Quadruple checked vacuum lines. I actually replaced all of them. Shimmed the throttle linkage because pulling it towards the front of the pickup would calm the idle down. As soon as you drove though it would get stuck around 1100-1500 rpm.

bought a low mileage throttle body off eBay from a very well rated vendor. Says for 96-2000 tacomas, t100, 4 runners etc. $250 so I thought screw it why not.

I didn’t want to deal with eBay returns and trying to find a manual trans throttle body (because they are different) is harder to find. The manual one has dash pot that doesn’t allow the throttle to slam shut.

anyway I modified my throttle cable bracket as it needed to get closer to the TB. Don’t mind the spacer. That’s a different story.

throttle response is way better and idle is perfect. Seat of pants says it needed it.

long but it’s been a journey.

 

Numbers on the top were different. My throttle linkage and the linkage on the other are completely different. Interestingly enough my tb the linkage is offset from the throttle plate. This one is directly attached to it.

 

So you made it work? From the auto? That's great!

 

No issues at all without running the dash pot thing either.

 

That is great.

 

I did! I am gonna make a new throttle cable bracket out of a new piece of aluminum so it doesn’t look so janky.

 

I wouldnt mess around.....I'd send your original to max bore and let em do their stuff....

and then sell the new one........after test period........

 

it’s running better than ever. Gonna send it! Put a couple hundred miles on it so far . Might send the old one in and see what maxbore can do though. I mean why not right?

 

I believe the dash pot gives the throttle a tiny boost when triggered by either the power steer solenoid, or the AC......


Very cool what you did......shows how versatile these trucks are....
......never know what the ecm will do when thrown a curve ball......

And dont know where you got such a good looking throttle body.....all the used ones I've seen looked like 9 miles of bad road.......and $hundreds to boot....

 

According to some research it slows the throttle plate from closing abruptly between shifts on the manual. I think because of the way this TB is designed it doesn't need that. I haven't had any issue anyway. When you look up my throttle body (for a 98 and manual, V6) they are discontinued. You can still get the OEM brand new from McGeorge Toyota for $346.00. That's not too bad. I can tell they took this one I got apart, sand blasted it and cleaned it up well. All the hardware is new that holds the TPS, ICV on. Found it on Fleabay from a well known seller. Says they are low mileage take offs. I assume by the sand blasting and obvious spots you can see where rust once was these were sitting around for some time (at one point). Works good for now. Gonna take off my throttle body spacer though as those to me are just a gimmick that don't have any proof of doing anything to help the engine.

 

How did you adjust the throttle cable? Currently picking up an auto tb and putting it in my manual, so I think I will need to do the same. I have a 98 tacoma and the one I'm replacing it with is from a 98 4runner. Guys said the 4runner was manual but it doesn't have the dash pot so I assume maybe it was auto.

 

The dashpot is a smog thing… it prevents high intake manifold vacuum and a rich exhaust which would cause a popping sound.

 

I didn't have to do too much adjusting. I tightened it up a little bit as my cable is old but that's done at the adjusters hooked to the throttle body. The adjusters being the nuts at the end of the cables.

 

Why not just use the correct TB? Just for funzies to see if it's possible? I'm genuinely curious, no disrespect.

 

Manual transmission throttle bodies are much harder to find than the autos. They are kind of scarce.