Posted about issues I was having with a mil spec tb a while back. Finally got around to sending it back in to Aby to have it looked at and rebuilt. The original issue was I was getting a throttle hang issue and it had a leaking biss screw. I purchased it used off a member here. Aby stood behind their product and offered to rebuild it at cost of shipping and parts. tb was rebuilt and sent back. I asked in email if it was diagnosed what the issue was and what all was done to the tb and never got a response back. Figured it was probably the leaking biss screw as well as maybe damaged seals causing the shaft to hang. Received the tb back, installed with new 65mm gasket and the throttle hang is still present.

Here are facts. This is an evo 9 tb and according to aby is an older milspec unit. Aby also stated that with it being an evo 9 tb it shouldnot matter Iim using it on an evo 8 03 model. I have checked the throttle cable and tensioned it properly. The cable has been lubed as well where it goes into the sleeve. While the tb was being rebuilt I reinstalled the stock 8 tb and had 0 throttle hang issues. Now that I have paid a member for a piece of crap unit that he was not completely honest about and now the chatge to rebuild it im stuck with a unit that does not work properly and have now paid more for it than a brand new unit would have cost me and would like to figure out what the deal is.

The issue is when cruising and letting off the throttle to decel if I clutch it before letting the car decel under 1800 rpms or so the throttle hangs and idles at 2k until I stick my foot under the throttle and pull it up. The idle then drops to where it should be. I would absolutely love to figure this out but if I cant I will be switching to a BR unit and buying new since obviously people cant be honest anymore when selling a used product.

 

sorry to hear about the issues buying used parts on here. Unfortunately there are lots of scammers on the FS section.

 

Can you replicate this issue while revving the motor by hand at the throttle body?

If it sticks so bad you have to use your foot to return the accelerator pedal to the normal position then it is definitely hanging up on something. Seeing how your Evo 8 throttle body worked fine after you swapped it out...I would say try revving the car slowly by hand and see if you feel it hanging up on anything..maybe you'll see the accelerator cable bind a bit or maybe you'll be able to feel it by hand...

Do you feel anything out of the ordinary on your foot while pressing down on the accelerator?

 

Nothing out of the ordinary really when pushing my pedal besides the car being more peppy and rev happy which is expected from a larger tb. Ill look at it when I get home again for the millionth time and inspect everything again. Ill compare both the mil spec unit and the oem evo 8 tb side by side and see if the springs feel any different. Im positive its something in the tb itself since its npt doing it on my stock unit. I even have a third oem stock tb I will swap on and see if maybe it will have the same issue, I will also swap all of the sensors as well just to make sure. I would have thought aby checked the iacs and tps after disassembling and cleaning but I could be wrong.

 

I checked the tps out, it's voltage range functioned as normal. I dont do anything to the iac, other than give a visual inspection. Never claimed that I did, ever.

I offered to rebuild this tb for you & you only paid for the parts, trying to help you out after buying old used stuff. Seeing that you started this thread shortly after sending me an email telling me what you've found, what else can i do.

Since you said you have another oem tb that worked fine, i offered to run your tb on my car to understand the issue. This is the 1st instance i have experienced like yours.

Trying to diagnose the problem on-line is always a struggle.

It's tough wanting to help someone when they imply that you didnt do certain things, whether you said you would or not.

I dont see how the tps would keep your throttle open, after i set it up, i could see that the tb fully closes. Besides that, the iac isnt connected to the throttle shaft-so not sure how that would cause the throttle shaft to hang open as well.....just saying.

 

Im not implying anything. I simply made a statement saying "I would assume that you checked them both since they are removed in the process but that I could be wrong because I am unaware of your process for things like this when rebuilding a unit". That is what was meant. Obviously you had to recalibrate the tps once removed.

This thread is in no way bashing you, the work you do, or your product. I have already said in th op that you have stood behind your product so there isnt much more you can do.

As for you offering to run this one on your car to diagnose it well its the first I have heard of that offer. I will go back and check pur emails though to bs sure and if ypu previously mentioned that then well I appologize. And yes it is hard to diagnose something over the internet.... but another fact is that you had this in your hands, so was it properly diagnosed when in your possession? Or was it just a rebuild and send back out deal?

The only reason for this posting is for more advice, more opinions, and more help. Am I not allowed to do so? I would like to get this figured out as quickly as possible so lets try not to jump to conclusions please.

 

I retrac t my statement and appologize about you offering to run this unit on your car. I did not see that email in between emails we have sent back and forth this morning. If the offer is still on the
Table I will remove the tb once I get home and have another look at things and send it back to you.

 

mil-spec has great customer service

 

I would make sure the cable "slack" is the same for both throttle bodies. Since they exacting the "same", maybe a little adjusting is needed.

 

Update

Problem seemed to have fixed itself somehow. I emailed aby to let him know last night so hopefully he gets it today.

We had emailed back and forth while I was at work yesterday and he did in fact offer for me to send it back and run it on his personal car. I didnt see that email in between emails sent.

When I got off work and drove the car home, roughly a 45 min drive, the throttle hang was present still but had greatly improved. I found that it would only hang when rolling off the accelerator, but if I snappdd my foot off the pedal the car would decel like normal.

When I got home I touched nothing and adjusted nothing simply opened and closed the tb on the car a bunch of times both letting it snap shut and lightly shutting it. Went through its full range of motion and did the same for my stock tb comparing the two while the mil spec was inthe car. After probably and hour of checking over this and making sure Iit all seemed good I decided to drive the car and do some logging just to ensure npthing else was going on. Soon as I started to drive throttle hang was gone. Drove to work this morning and still no hanging. Ill keep my eye on it and make sure it doesnt act weird again but for now it fixed itself somehow?

And yes milspec has by far the best customer service of anyone I have dealt with thus far.

 

my bet is that the iscv trim in the ecu was way off for this throttle body. i had a similar issue when i temporarily swapped an ecu into my evo that had been used in a high hp build with 2150s, SD, etc. I flashed in my ROM, but iscv trims do not reset with a flash. took a few hours of stop and go driving before the trims aligned for my setup and idle calmed down.

 

My car did this to me once. In my case, the tb was sticking open. I didn't know why...it was sticking at all points. I pushed the car home....did nothing other than snap it open/shut a few times....fixed itself.

I think my cable was bound somewhere and that moving the tb got it back where it should be.

Weird. I dunno.