383 turns on... WooT!!

Bastard doesn't idle right!! First it was suggested that the idle was set to low, I denied that right away because Ion set the idle to 950. So they then proceed to mess with the idle on the TB (58mm from BBK).

Now, when it's idling (For its few seconds), it's at 1500.

But like I said, only for a few seconds. The bastard car starts dropping rpms and there isn't a damn thing you can do about it. Goosing the throttle doesn't do jack. You have to wait for the "hiccup" to finish before getting the rpms to climb back up. But thats only if you mess with the pedal and catch it. Otherwise, it stalls.

So now we rev the motor to 2500 and hold it there. RPMS STILL FALL!! You can counter it, at all... doesn't work. You have to wait until the "Hiccup" is over and then it goes back to normal. This all happens in like 15 seconds intervals.

Any ideas or suggestions?

Coolant Temp Sensor was an idea

Or idle valve on the BBK? Said it doesn't have one, so you have to drill one out and stick a piece of 1/2" copper in there?

 

Is the vacuum hose from the brake booster to the intake manifold hooked up. My car would not idle when I forgot to hook it up. Just look everything over real good, its always some little thing causing the car to run bad.

 

What injectors? Was the tune made specifically for the injectors?

Running rich running lean?

Unplug hte MAF and see if you still have the problem or if it stays the same.

Are you getting any codes?

Check around for vacuum leaks as stated.

Was the cam degreed right? I suppose it would bend the valves if not.

Does it have idle problems when first started up or once it warms up?

Did you delete the rear O2s in the tune?

Did you desensitize knock in the tune? With a setup like that it will definately read false knock.

Did your people maybe switch up plug wires?

Did they maybe get your opti wet or damage it?

Is the car missing at all or just erratic idle?

The oil is clean right, no mixing with coolant or anything?

The little hole in front of the TB, it's not blocked right?

I have heard of horror stories with tuning 58mm TBs.

Contact Lloyd or Ion I know they can help.

 

This sound like a possibility for a battery or charging system problem?

 

Chris sounds like a vacuume issue dude, check to make sure everything is squared away....def sounds like a vacuume leak though, i could be wrong too.

 

Vacuum leaks cause the idle to climb... not stall out.

You could have the valve lash set too tight. Or it could possibly be a fuel pressure issue.

 

But the car will run good even after it's little hiccup. Given it's only for a few seconds, but it'll still do it. Does that matter?

 

Not if the vacuum leak is big enough. A large vacuum leak will cause the motor to die.

 

I doubt that the plenum to the TB is not all the way on (sometimes the bottom isn't on and you can't see it from the top) just a thought. Do you have a stock TB to swap out and see if that is your problem?

 

why does your bbk not have a iac? i transfered my friends over from his stock throttle body to the bottom of his 58mm bbk. do you have a gaping hole under your throttle body? if your iac is their hook up a scanner, check your iac pid see what percent its at.

 

Well he said he checked the charging system and MAF. He said he checked the grounds, but is going to back and check again to make sure. He said he checked vacuum and fuel pressure.

He is very confident that it's the tune... but can it be the tune? Why would it run right for a bit then have it's hiccup just to repeat the cycle?

 

Well it wasn't the uplaod :-) That upload went in perfect with no problems or hang ups, i know cus I did it myself Check with Ion, but I doubt VERY much thats the issue....

 

Drive it around for a while see if the learning computer fixes itself. I know when my vette was first done it seemed slow. It gradully got faster and faster over the first week or so.

 

It stalls, I can't drive it. I would have to give it gas non-stop just to keep it alive.

 

Anyone?