1988 4.0 4X4 Failed Emissions Help

[diablo8511]

I have now failed the emissions test 5 times. Any help would be appreciated. Numbers are as follows

 

Loaded HC 255 - 220 Fail

Loaded CO 2.53 - 1.20 Fail

Idle HC 217 - 220 Pass

Idle CO 0.98 - 1.20 Pass

(these are the best numbers Ive gotten in all 5 tests and is the most recent test result)

 

Things I have already done:

plugs,wires,oil change,air filter, new o2 sensor, new cat, ground refresh, c101 connecter refresh, Ignition coil refresh, cleaned IAC, seafoamed thru intake.

[Geonovast]

All at the same place? 

 

I'd go somewhere else just to rule out that their equipment sucks.

[1989 Eliminator]

Do you have an aftermarket air filter?

[mvusse]

Looks like you're running rich.

 

My guesses are bad coolant temp sensor first, and leaky injector second.

[Eagle]

Or a bad oxygen sensor.

[diablo8511]

Regular air filter,new oxygen sensor, i will check the coolant temp sensor

[diablo8511]

Problem solved! Turns out i have excessive blow by and there were fumes coming threw the front ccv line into the airbox and going right back threw the throttle body. So I disconnected that line put in some denatured alcohol and passed with flying colors. Although there was a new guy down at the testing center that must have been having a bad day or hates jeeps because he was giving me all kinds of $#@!. Telling me i needed to show him my receipt for the new cat or he couldn't test it (after he already did the test). Then he went over and talked to a supervisor and came back and said " well I guess your good, you passed.". I don't know what his problem was normally all the guys down there are friendly and joking around with me. :dunno:    

[cruiser54]

You need to replace/clean the CCV lines, especially the one from the rear of the valve cover to the intake manifold. also, the grommet in the valve cover may have swelled nearly closed.