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1999 Buick LeSabre Question: po303 shows up at idle only

 

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glenn sr, Sparks, NV, September 08, 2013, 20:20
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new 6/3 coil, wires and plugs. injector has 13.1 ohms, noid light lights, without pulling the injectors out..is there a way to diagnose a leaking injector. a balance test?...o2 sensor readings?..

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  • Answer #1

    September 08, 2013, 20:59
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     Master

    Good scanner, ie Snap-on modis, can run an injector balance test! However if the misfire only shows up at idle, you should check cyl 3 for low compression. Also a vacuum leak on or near # 3 cylinder will cause this.

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    glenn sr, September 12, 2013, 10:44
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    compression checked...OK!

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    pushrod, September 12, 2013, 14:51
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    Replace injector.

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    glenn sr, October 04, 2013, 11:56
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    new injector installed..shop said old one bad..now code po303 comes up

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    pushrod, October 04, 2013, 12:46
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     Master

    Well that's what you had before the work was done so what did the shop say is wrong now? Surely they checked for injector pulset to the #3 injector? And it was correctly installed with new o-rings! It's kinda their baby now!! Let them rock it!!!

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    glenn sr, October 06, 2013, 20:45
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    I told the shop to check the injector in question..they checked with there scanner and replaced #3 injector. I don't think that they actually checked the spray pattern or checked to see if the injector was leaking..not an impossible test! they reported to me that the injector was bad. I took the car for the weekend and the code po303 didn't show up until sunday. I believe the old injector was good. I do have it in my hands so I'll take to TMCC to bench test IT. if it turns out to be good, I cannot bring myself to take it back to the shop that condemned it.

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