so my idle when warm is around 1500 rpm, its a smooth clean idle, so far i have cleaned the throttle body, replaced the tps sensor and IAC valve with NEW units, and i replaced the valve cover gasket with a perm seal gasket and replaced the oil filler cap and replaced the breather tube. I have sprayed all of the tubes with carb cleaner and tryed pinching them all to look for a difference in rpm NOTHING, but if i pinch the breather tube to the intake idle drops to a steady 1k rpm, this means lean or rich? anyone think its my o2 sensor?

 

ShoulD there be a pcv valve on both sides right now there is one on the intake side but just a strait hose on the filter side

 

Carnac the Magnificent will tell us what year XJ you have and what engine you have...

Edit: Sorry, I just saw you have an 89 XJ. Go back to sleep Carnac.



If you have a newer (LOL) Xj the fitting on the rear of the valve cover will be the CCV (similar to a PCV). It has a fixed metering orifice in it - about a 1/8" hole. The front fitting is open.

A high idle RPM usually means a vacuum leak.

 

so it seems i have a ccv valve that is letting 2 much air in the intake causing a high idle then?

 

Have you adjusted your TPS on the "engine" side?

Has anyone ever screwed around with your throttle butterfly adjustment?

 

mine is an 89 not newer

 

What's that mean?

 

tps is new and adjusted, do not know about the butterfly adjustment, it idles fine in gear around 800 rpm clean smooth idle

 

oh what ccken said

 

anyone have napa part numbers for the ccv gromet, hose, front gromet , hose , so i can order, my front hose may be 2 big letting to much air in ? it had an open filter from p/o before

 

I guess the '89 doesn't have a CCV like the newer XJ's. maybe Cruiser54 can help you on this.

 

Renix Vacuum Harnesses
The vacuum harness that attaches to the front of the valve cover and includes the grommet/fitting, and is called the front harness, is Napa part number BK 715-1367
　
http://www.napaonline.com/Catalog/CatalogItemDetail.aspx?R=BK_7151367_0269070623
　
The vacuum harness that is closest to the air cleaner, EGR etc, and is called the rear harness, is Napa part number BK-715-1366.
http://www.napaonline.com/Catalog/CatalogItemDetail.aspx?R=BK_7151366_0269070622
　
The tube from the rear of the valve cover to the intake manifold is part number 715-1365.
http://www.napaonline.com/Catalog/CatalogItemDetail.aspx?R=BK_7151365_0066877355
　
Revised 09-11-2012

 

thanks for the help everyone, so i ordered the rear vacuum line with the part number cruiser gave me, installed it , made my rpm drop to a steady 1k to 1050, decided to check the butterfly screw like cruiser thought of, it was so tight in i almost stripped it trying to losen it, i also had an angle mirror and inside it dif look like it had been messed with shinny metal , i losened it maybe 1/4 turn and reinstalled it helped me a bit 2 much, im around 500 rpm warm, 2 dark outside, tomorrow il do like a 5th of a turn or less i should be at like 800 or so,
thanks all this problem has been bugging me, now on to my alternator problem lol

 

Before messing with the screw again, unless you're gonna adjust it per my write-up, readjust your TPS. It's off now.

 

Thx will dO