Wamsutta
Well-known member
If I have a RED X on both EVAP and HRT, I'm not going to pass smog, correct?
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Autel AL329 I/M Readiness Checklist
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Rusted Nut
Well-known member
Is engine up to full operating temps? Get to temp and take another reading.
What year is the vehicle? The EPA I/M recommendations (assuming your state is following the EPA guidelines) permits two incomplete monitors for model year 1996-2000 vehicles. 2001 vehicles and newer can only have one incomplete monitor.
5 monitors will fail anywhere!
5 monitors will fail anywhere!
Thanks. So you probably need them all set (two can be incomplete for a 2000 year vehicle according to Texas DPS).
Any check engine lights? You do anything that would have reset the monitors? Removing power to the battery or even clearing codes if none are set can reset all the monitors. I would expect a pending code or a code if the monitor is setting and than some drive parameter is causing it to go back into incomplete.
Not going to lie. On "troublesome" vehicles I carry the reader around and do circles around the emission testing facility. When enough monitors are set I pull into the line and have them scan.
I had a cylinder 3 misfire earlier today, but it went away. I ran a spark test on all the cylinders and I switched two of the three ignition coils around. In the process of doing that, the misfire went away. I also pulled the cylinder 3 spark plug out too. It looked perfect. Last week I had to replace the ICM and the ICM connector. One of the connector pins was extremely loose and had been arcing. I was going to replace that single pin, but when I tested the pin fitment of the rest of the pins, I decided it was best to replace the entire 14 pin connector. Engine runs very nice when it doesn't have a misfire.
Try it with a quarter to three quarter full fuel tank, drive the car from cold until full warmed up and park it and let it sit and cool all the way off. Evap is always the trickiest/last monitor to run.
Rusted Nut
Well-known member
Basically the EVAP system doesn’t operate all the time, only when certain parameters are met ( fuel tank pressure, A/F ratio, etc..). As long as you don’t have any codes showing, it may take a long drive to meet all those parameters. Grab a cup of coffee and go for drive, see if that gets it going.
You'll pass with two incomplete monitors so if just the EVAP monitor is still red don't worry about it.
Here is the chart out of the repair manual from GM for a 2000 Pontiac Bonneville.
rust in the eye
Well-known member
Evap always seems to be the last to clear