2003 Buick Park Avenue '03 Park Ave #4 Injector Not Firing
'03 Park Ave #4 Injector Not Firing
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A Customer brought in their Park Ave because their significant other severely screwed up the tune up after having a issue with frozen fuel lines. I recommended dry gas, they put it in then the plenum managed to literally explode after a bad backfire. (Before I was involved) The plenum was replaced as well as the intake gasket, then the #3 and #4 Injectors stopped firing. Apparently it turned into a hash match and 3 days later new front plugs, #3 Injector, Plenum, Gaskets, and Fuel pump were put in. They also managed to COMPELETELY screw up the plug wire firing order and after I fixed that it still runs rough. I put a noid tester on all the pigtails which they all passed, and even swapped out the one injector yet it still doesn't want to engage until the car's been redlined under load and THEN It'll fire until it's restarted. I haven't been able to do a impedance test since can't find the proper resistance anywhere to what the injector should be firing to.
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I also put 3 different full function OBDII scanners on it and the only code being thrown is a P0420. The engine light only comes on when the ECU flashes the ignition, and ABS/BRAKE light are always on but 0 codes are being thrown. I've never seen something like this and I'm actually stuck. Usually GM 3.8s are a second nature till the GM Isuues kick in.
Well now IF the #4 injector isn't functioning properly - it surely should have a misfire code -
Kinda like a PO304 maybe .. Locate the misfiring cylinder(s) and concentrate on that - IF you have a quality scan tool - it should have on screen live cylinder misfire data... Once the misfiring cylinder is found - TEST for proper ignition spark - fuel delivery - compression vacuum leak - coolant entering cylinder etc..
No way to determine the problem without *hands-on* TESTING.
I did hands on testing. EVERYTHING checks out other than he fact that Any replacement on that one location doesn't work. Coils are fine, fuses are fine, wires, plugs, ground spots, pigtails are all fine. "This function isn't supported with the selected vehicle" across all scanners when I go to check for live feed. All it'll give me is Engine RPM, O2B1@ 0.56v and O2B2@ 0.57v and MAP @ 5-6psi. That's it. Whoever had this before them severely screwed with everything and right now it's to the point the car is gonna get pushed off the cliff out back. So power is getting to the OBDII but if a SnapOn Modis Ultra can't get any info a el cheapo Innova wouldn't be any better.
I am *very familiar* with the Modis Ultra - I don’t understand why the misfire counters can’t be displayed - it should be under the engine date section.
I’m out of ammo.
It’s no telling what might be wrong with this one..
Good luck with it!
I pulled the ECM from a parts LeSabre out back and it seemed to work other than the fact the dash lit up and the connectors didn't want to jive together (Had to run jumpers). Codes were thrown for MAP, MAF, TPS, O21, O22I, ABS, Traction, TPMS, and Cam Position malfunction. I put the original Park Ave ECU in another '03 Model and It only threw signal to 2 coil packs and #2, #6 and #3 injectors weren't even registered. Luckily the ECU is only $100 at auto parts store so pretty easy fix. I wanna have this taken in and tested to see if it's actually repairable or not.
I did hands on testing. EVERYTHING checks out other than he fact that Any replacement on that one location doesn't work. Coils are fine, fuses are fine, wires, plugs, ground spots, pigtails are all fine. "This function isn't supported with the selected vehicle" across all scanners when I go to check for live feed. All it'll give me is Engine RPM, O2B1@ 0.56v and O2B2@ 0.57v and MAP @ 5-6psi. That's it. Whoever had this before them severely screwed with everything and right now it's to the point the car is gonna get pushed off the cliff out back. So power is getting to the OBDII but if a SnapOn Modis Ultra can't get any info a el cheapo Innova wouldn't be any better.
I am *very familiar* with the Modis Ultra - I don’t understand why the misfire counters can’t be displayed - it should be under the engine date section. I’m out of ammo. It’s no telling what might be wrong with this one.. Good luck with it!
I pulled the ECM from a parts LeSabre out back and it seemed to work other than the fact the dash lit up and the connectors didn't want to jive together (Had to run jumpers). Codes were thrown for MAP, MAF, TPS, O21, O22I, ABS, Traction, TPMS, and Cam Position malfunction. I put the original Park Ave ECU in another '03 Model and It only threw signal to 2 coil packs and #2, #6 and #3 injectors weren't even registered. Luckily the ECU is only $100 at auto parts store so pretty easy fix. I wanna have this taken in and tested to see if it's actually repairable or not.