PO203 injector curcit open fault

**jaredyocum** · 09-04-2013

I have a 2000 GTP with 180,000 miles on it that developed a miss yesterday . The weather was warm high 80's and I had driven 45 miles with no problem and I shut it off for 30 min and when I restarted it it had a miss with 2 codes cylinder 3 missfire and injector open circit. I shut if off and reset the code and it was fine again. To day I drove it to work 35 miles with no problem but at lunch drove it into town and it was fine until I shut it off and restarted it and same miss. Later after work I drove it 2/3 the way home no miss and then it did it again this time without the power cycle. After I got home I pulled the #3 injector plug and slipped a 194 light bult into the plug and started it and it flashed . Later after it cooled off I statred it and the miss was gone so I pulled the plug off and installed the bulb again it flashed as normal and the ECM displaed only the misfire code not the open circit code. I am wondering if its the injector . Thoughts?

**Booba5185** · 09-04-2013

I would check the injector impedence with a multimeter, in fact, I'd check all 6 and compare. They should all pretty much be the same, if cylinder 3 is different, then replace the injector. I had this issue with my 2000 GTP and the connectors inside the injector plug were spread to far apart. I bent the connectors in so they'd make better contact with the injector itself, and no problems since.

**jaredyocum** · 09-05-2013

Originally Posted by Booba5185

I would check the injector impedence with a multimeter, in fact, I'd check all 6 and compare. They should all pretty much be the same, if cylinder 3 is different, then replace the injector. I had this issue with my 2000 GTP and the connectors inside the injector plug were spread to far apart. I bent the connectors in so they'd make better contact with the injector itself, and no problems since.

Are the injectors the same for supercharged and normally aspirated ? I wonder where the best place to get injectors is ?

**Scottydoggs** · 09-05-2013

you can move the injector, see if the code moves to where you moved the injector to. if so the injector is clogged or bad.

not sure if they use the same injector n/a and s/c.

you could google how to clean injectors and try cleaning it. theres a few how to's on you tube.

**Fivefingerdeathpunch** · 09-05-2013

Injectors are not the same for L36 and L67.

**Booba5185** · 09-05-2013

They are not the same, neither are the injectors from the L32, they have to come from the L67.

**jaredyocum** · 09-05-2013

Originally Posted by Booba5185

They are not the same, neither are the injectors from the L32, they have to come from the L67.

I am not sure if its fact or fiction but Napa calls for Echlin CRB 238765 for a 2000 Grand Prix supercharged and non same part number thoughts?

**Booba5185** · 09-06-2013

Google isn't coming up with any results for that part number, so I can't say for sure. Before buying anything new, put your multimeter on the 20 ohm setting, unplug all 6 injectors, and put one lead on each of the pins inside the injector. Write down each reading, and compare. If the questionable injector is different than the other 5, there's your sign. It might be dirty, but I don't think the ECM would throw this code for a dirty injector, because it references the injectors impedance. I may be wrong, that's just my opinion.

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