High Idle (2000+ RPM) Issue

[joemags54]

Here's a hint on what happened here tonight....

Expect a couple of DIY articles from this.

Glad things worked out for you Kev. (PS. all is right with the world again, when Kevan starts posting pics!)

 

[Kevan]

Glad things worked out for you Kev. (PS. all is right with the world again, when Kevan starts posting pics!)

Sorry Joe, but that pic/post is from 4 months ago.

 

[joemags54]

Sorry Joe, but that pic/post is from 4 months ago.

That's just peachy.......where's my Paxil:dontknow:

 

[HaulinAsp]

:rock: Thanks for the info will try the reset procedure this weekend.

 

[Marc T]

I'm still having this problem too.Have done everything suggested here except taking off the throttle body and re-building. Really annoying-draws unnecessary attention when you pull up next to a Trooper at a light and it doesn't throttle down.

Replace the TPS and follow instructions in post #19, all will be good!!!:rock:

 

[belgiumbarry]

yep, i will have to do it again...
driving home this evening i had it again ... stops at 1500 revs ... and slowly back to normal...
i still believe the great TB blade( in my case the Xmetal ) has alot of bypass air in comparison with the stock ones who close almost 100 %....:dontknow:

 

[SERPENT]

yep, i will have to do it again...
driving home this evening i had it again ... stops at 1500 revs ... and slowly back to normal...
i still believe the great TB blade( in my case the Xmetal ) has alot of bypass air in comparison with the stock ones who close almost 100 %....:dontknow:

You are not alone Barry. We have the identical problem and have not been able to solve it for over a month. We have changed the TPS and the IAC.Today we tried the Roe start up procedure twice. No luck.Checked all the vaccum connections---nothing.Checked the throttle body gasket-- no problem.Increased the fuel pressure to 55 lbs to help the spray pattern on the 60 lb injectors--nothing. Could we possibly be dumping too much fuel into the system on deacceleration? Any other ideas anybody. Please let us know your thoughts ---this truly sux.

 

[belgiumbarry]

You are not alone Barry. We have the identical problem and have not been able to solve it for over a month. We have changed the TPS and the IAC.Today we tried the Roe start up procedure twice. No luck.Checked all the vaccum connections---nothing.Checked the throttle body gasket-- no problem.Increased the fuel pressure to 55 lbs to help the spray pattern on the 60 lb injectors--nothing. Could we possibly be dumping too much fuel into the system on deacceleration? Any other ideas anybody. Please let us know your thoughts ---this truly sux.

i think to switch back to stock TB... if this resolves the problem, there's no doubt ... the to much bypass air flow around the great blade not closing enough.... i think...:dontknow:

 

[099 FEVER]

What are all the specks that look like metal shavings in the manifold picture. I hope it's not and only needs cleanup before reassembly.

 

[SERPENT]

i think to switch back to stock TB... if this resolves the problem, there's no doubt ... the to much bypass air flow around the great blade not closing enough.... i think...:dontknow:

Tomorrow we will try pulling the 60 lb injectors and putting the stock injectors back in. Concerned that we may make the mixture too lean again. Guess we'll have to watch the A/F meter pretty close. If this does'nt solve the problem--the 60 lb injectors go back in and Boomers throttle body will go back on the shelf. Let me know how you make out.

 

[Kevan]

What are all the specks that look like metal shavings in the manifold picture. I hope it's not and only needs cleanup before reassembly.

What metal shavings?

 

[099 FEVER]

When looking at the pictures they have small whitish specks on the machined surface and in the gasket groove. A couple of them are large enough that they could provide a leak path after assembly. It also could be debris from the aluminum threads in the manifold. The factory may not have cleaned the holes very well after tapping. I found some on my head surfaces after taking my motor appart. The threads are 1/4-20 and are small for aluminum castings so pieces can be pushed to the bottom of the tap drill hole.

 

[Kevan]

The "specks" that you're seeing on either side of the o-ring are guides for the o-ring.
I believe there are 8 or 10 in total.

The "specks" that you're seeing on the machined face of the intake are simply pores from the original casting.

There were no shavings or swarf on or in the intake when I disassembled it (nor when I re-assembled it).