Help me diagnose a problem

[E30Nova]

Well I put the new throttle body on and along with the new afm it seems like the problem is gone. The only problem is now it idles at around 1300 rpms. I'm 99% positive I don't have any vacuum leaks but there has to be one somewhere. :hitler:

Matt

[E30Nova]

Yeah, so I drove the car to work last week and it's still doing the stupid WOT thing.

I'm about ready to roll this car off a cliff. :-x

Matt

[e30evt]

well lately my car is doing the samething after it (the car) gets hot will not pull but will idle, let it cool and it runs like a bat outta h---. gets hot and like tonite called a buddy with a wrecker, will check in the next couple of days but my bet is fuel pressure issue (fuel pump). Since I can go outside right now and drive to the store and back without incident. any takers on a bet?

[36brua]

well lately my car is doing the samething after it (the car) gets hot will not pull but will idle, let it cool and it runs like a bat outta h---. gets hot and like tonite called a buddy with a wrecker, will check in the next couple of days but my bet is fuel pressure issue (fuel pump). Since I can go outside right now and drive to the store and back without incident. any takers on a bet?

\

may sound strange but have you tried a different set of plug wires/pickup ?
I had a similar 'hot' running prob.would not take throttle. replaced wires fixed... after replacing some , checking rechecking all the usual suspects .. always something new good luck

[E30Nova]

One thing I remember is that the "good" throttle body I got didn't click when I went to WOT. No matter how I adjusted it, it would click off idle but not at WOT. Tomorrow or Saturday I'll try driving the car with the TPS disconnected and see if it makes a difference.

Matt

[RoDo]

One thing I remember is that the "good" throttle body I got didn't click when I went to WOT. No matter how I adjusted it, it would click off idle but not at WOT. Tomorrow or Saturday I'll try driving the car with the TPS disconnected and see if it makes a difference.

Matt

Your TPS won't click at the WOT end of the travel, only at the idle end so that should not be an issue.

[E30Nova]

Your TPS won't click at the WOT end of the travel, only at the idle end so that should not be an issue.

Interesting. I could have sworn the Bentley said it was supposed to click and/or change resistance at WOT. I don't get either one of those, which is why I changed the TB in the first place.

Still, I checked the resistance of the pulse sensor just on a hunch and it only has like 33 ohms. I could swear I replaced it shortly after I bought the car, but I'm not 100% sure. The car idles rough as hell and the car shakes like my Nova with a big cam and solid motor mounts. I figure the pulse sensor has to be bad just because the Bentley says it should read around 540 ohms, but before I buy a new one I'd ask you guys.

Would a bad pulse sensor create a rough idle? I thought it would either be perfect or it wouldn't even start, but I dunno.

Matt

[E30Nova]

Well, I bought a new pulse sensor. It measures 560 ohms compared to my old one's 33-ish ohms. Got that installed and it didn't change a damn thing. So I grabbed my phone and took a video of the idle.



Look how bad the engine is shaking. :(

And then at the end, I show my clean hand, put it behind the tailpipe and after a couple seconds it's covered in black stuff.



Matt

[E30Nova]

Bump.

Matt

[E30Nova]

Well, I disconnected the supposedly "good" AFM and the idle smoothed out. Put on the one that was messed with and it stayed smooth. Put the "good" one back on and it's still smooth but every now and then it starts shaking.

Anyway, I didn't remember if I hooked up the hose for the charcoal canister so I decided to check that out. Unfortunately I did hook it up, so that wasn't my problem, BUT, I figured while I was there, I'd check that connection that nando was talking about. Sure enough, when I unscrewed it, there was a little green forest growing inside.

After cleaning that up, I don't have the WOT problem anymore. :-D:-D:-D

Only thing is, like I said in an earlier post, when I come to a light, my idle stays around 1500-ish for a few seconds and then drops to 900-ish. I don't remember it doing that before I swapped throttle bodies, so I'm going to see if the throttle is closing enough at idle. Otherwise, anyone have any ideas as to why it's doing that?

Matt