kmascotto

I have been having the an issues after my Intake refresh. The GT idles at 775 rpm (perfect) when cold...and when the engine warms up it idles at 1000 rpm and stays there. There is a very slight hesitating when pressing the throttle too.

any suggestions

kmascotto

Every seal and vacuum line is new and all nicely sealed up.

Why would heat cause an increase in idle speed?

Would the Temp sensor II play a role?

I've replaced with new O2 sensor,
New ISV, TPS, Hall, CPS, Knock sensors
Every piece of rubber under the intake

I have cleaned the MAF (worked fine before)

Tom. M

is your throttle position switch set properly.. Should click when you close the throttle (car off.....actuate the throttle off the intake..and listen closely....

Tom. M

another question....when you let off the throttle...does your mileage gauge go to really high mpg (or in your case...low liters per/100km)?

kmascotto

Hi Tom, yes i get the little click from the TPS. I would imagine that if the throttle valve did not close all the way, I would have a high idle all the time.

I don't know the answer to your second question. But I will have a look on my drive home. If this occurs, what would it indicate?
Thanks

kmascotto

Thinking about it a little more, I did notice my "real time fuel consuption" was reading (zero) when I came off the throttle...is this what you mean?

Randy V

At freeway speed, car in gear, dash display set to Instant Fuel Use, foot off gas coasting, reading should show 90 mpg.

Another thing - is the air cotroller slider switched to the recerc position (far left)? This positions activates the air conditioner, resulting in higher RPM.

Tom. M

if it reads 0 then yes the tps is working.....mine would read an actual value...but never go to 0...suggesting the car didn't know the throttle was closed...

just another thought...my GT also had a pinched hose leading from the MAF to the oil filler neck...with a small hole... (easy to get pinched when replacing the intake if you're not careful)...don't know if you can peek under there to see if that's the case..

Tom. M

Cdn dash shows l/100km...so goes to 0 ...
no recirc on the GT...but good to make sure A/C button isn't on...

kmascotto

How should i interpret this? If mine reads zero...what would cause the difference?

Nope, A/C was in several different positions...no effect.

kmascotto

I'll have a look. The GT seems to run very smoothly and evenly (no real hunting even) when cold or warm...but when warm...it's at 1000rpm.

Cutter67

I would take a can of carb cleaner and spray around the intake and check for a vacuum leak or use smoke. most times a high idle after a intake refresh is a vacuum leak. and it will act just like how you discribe

kmascotto

trying everything

Mrmerlin

pay close attention to the sealing of the intake at the #1 intake runner the manifold can sometimes catch on the water bridge and then not fully seat on the head even with new gaskets this can cause a leak

Randy V

Dam Canuckians.

A Tip - you can switch the digital display from metric to US units by pulling back on the computer control stalk twice in rapid succession.