Micro Image Intake Manifold thread

[tooter]

Originally Posted by 4/20 NEVER FORGET

As for the throttle body, based on what I read on here, I did not do a chip swap. My part number is ending in 030. After driving it around for a couple hours tonight, I think I am going to have to do a chip swap. On initial start up the idle would not stabilize, it would climb in RPMs then drop quickly, then climb and drop over and over until shut off. I remember tooter saying to back the screw out a turn so I did so and the idle stabilized but was still very high. After backing it out further I was able to get the idle to stabilize.

My guess is I need to do a chip swap. The car doesn't drive perfect. When I am coasting off of the throttle, say at 30mph (or any mph, doesn't matter), it doesn't matter if I barely touch the throttle or hammer the throttle, the car has a tiny "hiccup" feeling, as if the throttle was partly open then it closed and then opened. It's hard to describe. Also, when I am at partial throttle and I let off the throttle, it hangs for a second or two before closing and starting to decelerate. Is that normal? I know the car did it before, but it is far more pronounced now.

I also had some problems with high idle and idle hang, but I found that adjusting the throttle screw to a higher rpm idle has fixed it. I'm idling pretty high right now, probably around 1000-1200 rpm, but I haven't gotten a check engine light since I adjusted it this way (maybe 10 miles worth of driving where it would happen immediately before) so I think I am just going to leave it for now.

What do you guys think? I thought I had the right throttle body part number, but I'm thinking a chip swap is in my future.

Did you try backing out this idle screw about one turn counterclockwise? (it's the small screw at the top center of the picture just under the black plastic chip...)




That should solve all of the problems you just described. Mine exactly the same symptoms, and they all disappeared once the idle speed was reduced.

[4/20 NEVER FORGET]

Originally Posted by tooter

Did you try backing out this idle screw about one turn counterclockwise? (it's the small screw at the top center of the picture just under the black plastic chip...)

That should solve all of the problems you just described. Mine exactly the same symptoms, and they all disappeared once the idle speed was reduced.

Yea, that's the idle screw I was talking about. At this point I've tried adjusting it to nearly it's full range and the thing still won't idle right, it also is still the engine code listed above.

Do you (or anyone with a 1zz throttle body) have the symptoms I described in my post above? Particularly the long throttle hang when you take your foot off of the gass, and the hiccup when you press down on the gas?

At this point I think I am going to buy another 1ZZ throttle body and chip swap it in my spare time.

[tooter]

Originally Posted by 4/20 NEVER FORGET

Yea, that's the idle screw I was talking about. At this point I've tried adjusting it to nearly it's full range and the thing still won't idle right, it also is still the engine code listed above.

Do you (or anyone with a 1zz throttle body) have the symptoms I described in my post above? Particularly the long throttle hang when you take your foot off of the gass, and the hiccup when you press down on the gas?

Yes.

I'm running a 1ZZ throttle body right now, and I had all of the exact same symptoms that you've been describing. They were all caused by the butterfly not being able to close enough for the ECU to stabilize the idle. Take the chip off and check to see if the butterfly is actually closing when you back off that little allen head screw.

I tell you mine runs way better than the stock throttle body ever did... once the butterfly was allowed to close.

At this point I think I am going to buy another 1ZZ throttle body and chip swap it in my spare time.

I hope you can sort this one out before you waste money on another one that will likely do the same thing.