A few questions I am having trouble researching

What can actually fail within the throttle body? I'm not talking about actual sensors, I mean the actual TB. The reason I am asking is that I have a d-series throttle body I am attempting to repair.

Is it bad that underneath the tps is rusty and corroded, I cleaned it out the best I could with brake cleaner and a toothbrush, but idk if there is anything that could fail in there.

Is the MAP sensor necessary for functional operation? I have one on my TB but it has never been plugged in, I don't even see wires for it anywhere near there. I am on a crome eprom tune if that is relevant.

Thanks

 

Any help out there?

 

So WHY are you trying to repair it? If you cannot identify anything past some corrosion and rust what is the real issue?

 

Throttle shaft
Throttle shaft bearings
Throttle plate screws
Throttle arm

As long as the TPS seals to the throttle body, and the throttle body seals to the intake, it should be fine.

Yes, unless you're running Alpha-N (TPS-based load). But based on context , I'm presuming you're not. It may be relocated.

 

seems like everything is operational mechanically. It opens and closes when I press the pedal. You tell me if im missing something?

They're both sealed. I will make sure to check with some carb cleaner at idle.

It is a crome tune, I am assuming that Alpha-N is a tuning reference? Googling now...

Edit: looks like a megasquirt/megatune thing? I dont have megasquirt for sure. Does that mean I am just failing to locate a MAP sensor on the firewall?

 

I tried to pretty fully detail my issues here.


https://honda-tech.com/forums/honda-crx-ef-civic-1988-1991-3/bad-idle-stalling-d16z6-also-firewall-vs-tb-mounted-map-sensor-3068446/

I also had a CEL 7 and issues with dying under load and stalling at low rpm

Thanks for your help!

 

Alpha-N is a universal term, not specific to any brand of management. It just means the ECU is not referencing manifold vacuum/pressure (MAP) to determine load. On a Alpha-N tune, throttle posistion is the only load reference. It's most common on applications where vacuum signals are either too weak or erratic to use a MAP sensor.

 

So that is a possibilty? The last d16z6 that was in here was seeing 28psi... The PO liked to go pretty fast

How would I figure that out?

 

If that's the case, they certainly had a 3+bar MAP sensor somewhere. You wouldn't want to run 28psi of boost with TPS for load - there too much transient variation between 25" of vacuum and 28 psi of boost. It's hard to tell you what to look for because there could be a GM 3-bar tie-wrapped to something, or a AEM/SST 3,4,5 bar tee'd off the manifold... i have no idea. How are the columns in your crome tune labeled?

The hunt for the missing map sensor continues. lol

 

There is a GM 3bar MAP on top of the throttle body, just no plug or wiring anywhere to be seen LOL

I replaced the TPS, calibrated it, replaced the cap and rotor, spark plugs, cleaned off all of my grounds, and made sure the EPROM chip was all the way plugged it. It seems to be running great now, but the MAP sensor still has me worried

I dont have any of the tuning stuff for crome, it was all done by the PO, I haven't ever even had a chance to look at it. I would need a $100 chip interface for that?

 

Updated with engine bay pics, guy seems to think i must have a firewall mounted MAP

https://honda-tech.com/forums/showth...1#post47564321

 

Turned out there was a GM 3bar MAP half stuffed into a grommet in the firewall

 

I replied to your other thread.